Add a new RepositorySet class and restrict pool usage to the solver

Breaking change for the plugin interface so bumping the version of
composer-plugin-api to 2.0.0

First step for a refactoring of the package metadata loading mechanism

src/Composer/Command/BaseDependencyCommand.php

@@ -21,6 +21,7 @@ use Composer\Repository\PlatformRepository;
 use Composer\Repository\RepositoryFactory;
 use Composer\Plugin\CommandEvent;
 use Composer\Plugin\PluginEvents;
+use Composer\Repository\RepositorySet;
 use Symfony\Component\Console\Formatter\OutputFormatterStyle;
 use Composer\Package\Version\VersionParser;
 use Symfony\Component\Console\Helper\Table;
@@ -71,15 +72,15 @@ class BaseDependencyCommand extends BaseCommand
         $commandEvent = new CommandEvent(PluginEvents::COMMAND, $this->getName(), $input, $output);
         $composer->getEventDispatcher()->dispatch($commandEvent->getName(), $commandEvent);
 
-        // Prepare repositories and set up a pool
+        // Prepare repositories and set up a repo set
         $platformOverrides = $composer->getConfig()->get('platform') ?: array();
         $repository = new CompositeRepository(array(
             new ArrayRepository(array($composer->getPackage())),
             $composer->getRepositoryManager()->getLocalRepository(),
             new PlatformRepository(array(), $platformOverrides),
         ));
-        $pool = new Pool();
-        $pool->addRepository($repository);
+        $repositorySet = new RepositorySet(new Pool());
+        $repositorySet->addRepository($repository);
 
         // Parse package name and constraint
         list($needle, $textConstraint) = array_pad(
@@ -89,7 +90,7 @@ class BaseDependencyCommand extends BaseCommand
         );
 
         // Find packages that are or provide the requested package first
-        $packages = $pool->whatProvides(strtolower($needle));
+        $packages = $repositorySet->findPackages(strtolower($needle)); // TODO this does not search providers
         if (empty($packages)) {
             throw new \InvalidArgumentException(sprintf('Could not find package "%s" in your project', $needle));
         }

src/Composer/Command/CreateProjectCommand.php

@@ -28,6 +28,7 @@ use Composer\Repository\RepositoryFactory;
 use Composer\Repository\CompositeRepository;
 use Composer\Repository\PlatformRepository;
 use Composer\Repository\InstalledFilesystemRepository;
+use Composer\Repository\RepositorySet;
 use Composer\Script\ScriptEvents;
 use Composer\Util\Silencer;
 use Symfony\Component\Console\Input\InputArgument;
@@ -290,8 +291,8 @@ EOT
             throw new \InvalidArgumentException('Invalid stability provided ('.$stability.'), must be one of: '.implode(', ', array_keys(BasePackage::$stabilities)));
         }
 
-        $pool = new Pool($stability);
-        $pool->addRepository($sourceRepo);
+        $repositorySet = new RepositorySet(new Pool($stability));
+        $repositorySet->addRepository($sourceRepo);
 
         $phpVersion = null;
         $prettyPhpVersion = null;
@@ -305,7 +306,7 @@ EOT
         }
 
         // find the latest version if there are multiple
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $package = $versionSelector->findBestCandidate($name, $packageVersion, $phpVersion, $stability);
 
         if (!$package) {

src/Composer/Command/InitCommand.php

@@ -21,6 +21,7 @@ use Composer\Package\Version\VersionSelector;
 use Composer\Repository\CompositeRepository;
 use Composer\Repository\PlatformRepository;
 use Composer\Repository\RepositoryFactory;
+use Composer\Repository\RepositorySet;
 use Composer\Util\ProcessExecutor;
 use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Input\InputOption;
@@ -40,8 +41,8 @@ class InitCommand extends BaseCommand
     /** @var array */
     private $gitConfig;
 
-    /** @var Pool[] */
-    private $pools;
+    /** @var RepositorySet[] */
+    private $repositorySets;
 
     /**
      * {@inheritdoc}
@@ -637,16 +638,16 @@ EOT
         return false !== filter_var($email, FILTER_VALIDATE_EMAIL);
     }
 
-    private function getPool(InputInterface $input, $minimumStability = null)
+    private function getRepositorySet(InputInterface $input, $minimumStability = null)
     {
         $key = $minimumStability ?: 'default';
 
-        if (!isset($this->pools[$key])) {
-            $this->pools[$key] = $pool = new Pool($minimumStability ?: $this->getMinimumStability($input));
-            $pool->addRepository($this->getRepos());
+        if (!isset($this->repositorySets[$key])) {
+            $this->repositorySets[$key] = $repositorySet = new RepositorySet(new Pool($minimumStability ?: $this->getMinimumStability($input)));
+            $repositorySet->addRepository($this->getRepos());
         }
 
-        return $this->pools[$key];
+        return $this->repositorySets[$key];
     }
 
     private function getMinimumStability(InputInterface $input)
@@ -681,8 +682,8 @@ EOT
      */
     private function findBestVersionAndNameForPackage(InputInterface $input, $name, $phpVersion, $preferredStability = 'stable', $requiredVersion = null, $minimumStability = null)
     {
-        // find the latest version allowed in this pool
-        $versionSelector = new VersionSelector($this->getPool($input, $minimumStability));
+        // find the latest version allowed in this repo set
+        $versionSelector = new VersionSelector($this->getRepositorySet($input, $minimumStability));
         $package = $versionSelector->findBestCandidate($name, $requiredVersion, $phpVersion, $preferredStability);
 
         // retry without phpVersion if platform requirements are ignored in case nothing was found

src/Composer/Command/ShowCommand.php

@@ -29,6 +29,7 @@ use Composer\Repository\CompositeRepository;
 use Composer\Repository\PlatformRepository;
 use Composer\Repository\RepositoryFactory;
 use Composer\Repository\RepositoryInterface;
+use Composer\Repository\RepositorySet;
 use Composer\Semver\Constraint\ConstraintInterface;
 use Composer\Semver\Semver;
 use Composer\Spdx\SpdxLicenses;
@@ -52,8 +53,8 @@ class ShowCommand extends BaseCommand
     protected $versionParser;
     protected $colors;
 
-    /** @var Pool */
-    private $pool;
+    /** @var RepositorySet */
+    private $repositorySet;
 
     protected function configure()
     {
@@ -523,19 +524,13 @@ EOT
         $constraint = is_string($version) ? $this->versionParser->parseConstraints($version) : $version;
 
         $policy = new DefaultPolicy();
-        $pool = new Pool('dev');
-        $pool->addRepository($repos);
+        $repositorySet = new RepositorySet(new Pool('dev'));
+        $repositorySet->addRepository($repos);
 
         $matchedPackage = null;
         $versions = array();
-        $matches = $pool->whatProvides($name, $constraint);
+        $matches = $repositorySet->findPackages($name, $constraint);
         foreach ($matches as $index => $package) {
-            // skip providers/replacers
-            if ($package->getName() !== $name) {
-                unset($matches[$index]);
-                continue;
-            }
-
             // select an exact match if it is in the installed repo and no specific version was required
             if (null === $version && $installedRepo->hasPackage($package)) {
                 $matchedPackage = $package;
@@ -546,8 +541,8 @@ EOT
         }
 
         // select preferred package according to policy rules
-        if (!$matchedPackage && $matches && $preferred = $policy->selectPreferredPackages($pool, array(), $matches)) {
-            $matchedPackage = $pool->literalToPackage($preferred[0]);
+        if (!$matchedPackage && $matches && $preferred = $policy->selectPreferredPackages($repositorySet->getPoolTemp(), array(), $matches)) { // TODO get rid of the pool call
+            $matchedPackage = $repositorySet->getPoolTemp()->literalToPackage($preferred[0]);
         }
 
         return array($matchedPackage, $versions);
@@ -961,9 +956,9 @@ EOT
      */
     private function findLatestPackage(PackageInterface $package, Composer $composer, $phpVersion, $minorOnly = false)
     {
-        // find the latest version allowed in this pool
+        // find the latest version allowed in this repo set
         $name = $package->getName();
-        $versionSelector = new VersionSelector($this->getPool($composer));
+        $versionSelector = new VersionSelector($this->getRepositorySet($composer));
         $stability = $composer->getPackage()->getMinimumStability();
         $flags = $composer->getPackage()->getStabilityFlags();
         if (isset($flags[$name])) {
@@ -987,13 +982,13 @@ EOT
         return $versionSelector->findBestCandidate($name, $targetVersion, $phpVersion, $bestStability);
     }
 
-    private function getPool(Composer $composer)
+    private function getRepositorySet(Composer $composer)
     {
-        if (!$this->pool) {
-            $this->pool = new Pool($composer->getPackage()->getMinimumStability(), $composer->getPackage()->getStabilityFlags());
-            $this->pool->addRepository(new CompositeRepository($composer->getRepositoryManager()->getRepositories()));
+        if (!$this->repositorySet) {
+            $this->repositorySet = new RepositorySet(new Pool($composer->getPackage()->getMinimumStability(), $composer->getPackage()->getStabilityFlags()));
+            $this->repositorySet->addRepository(new CompositeRepository($composer->getRepositoryManager()->getRepositories()));
         }
 
-        return $this->pool;
+        return $this->repositorySet;
     }
 }

src/Composer/DependencyResolver/Pool.php

@@ -15,6 +15,7 @@ namespace Composer\DependencyResolver;
 use Composer\Package\BasePackage;
 use Composer\Package\AliasPackage;
 use Composer\Package\Version\VersionParser;
+use Composer\Repository\RepositorySet;
 use Composer\Semver\Constraint\ConstraintInterface;
 use Composer\Semver\Constraint\Constraint;
 use Composer\Semver\Constraint\EmptyConstraint;

src/Composer/DependencyResolver/Solver.php

@@ -15,6 +15,7 @@ namespace Composer\DependencyResolver;
 use Composer\IO\IOInterface;
 use Composer\Repository\RepositoryInterface;
 use Composer\Repository\PlatformRepository;
+use Composer\Repository\RepositorySet;
 
 /**
  * @author Nils Adermann <naderman@naderman.de>
@@ -26,8 +27,8 @@ class Solver
 
     /** @var PolicyInterface */
     protected $policy;
-    /** @var Pool */
-    protected $pool;
+    /** @var RepositorySet */
+    protected $repositorySet = null;
     /** @var RepositoryInterface */
     protected $installed;
     /** @var RuleSet */
@@ -36,6 +37,8 @@ class Solver
     protected $ruleSetGenerator;
     /** @var array */
     protected $jobs;
+    /** @var Pool */
+    protected $pool = null;
 
     /** @var int[] */
     protected $updateMap = array();
@@ -62,17 +65,16 @@ class Solver
 
     /**
      * @param PolicyInterface     $policy
-     * @param Pool                $pool
+     * @param RepositorySet       $repositorySet
      * @param RepositoryInterface $installed
      * @param IOInterface         $io
      */
-    public function __construct(PolicyInterface $policy, Pool $pool, RepositoryInterface $installed, IOInterface $io)
+    public function __construct(PolicyInterface $policy, RepositorySet $repositorySet, RepositoryInterface $installed, IOInterface $io)
     {
         $this->io = $io;
         $this->policy = $policy;
-        $this->pool = $pool;
+        $this->repositorySet = $repositorySet;
         $this->installed = $installed;
-        $this->ruleSetGenerator = new RuleSetGenerator($policy, $pool);
     }
 
     /**
@@ -83,6 +85,11 @@ class Solver
         return count($this->rules);
     }
 
+    public function getPool()
+    {
+        return $this->pool;
+    }
+
     // aka solver_makeruledecisions
 
     private function makeAssertionRuleDecisions()
@@ -210,7 +217,11 @@ class Solver
     {
         $this->jobs = $request->getJobs();
 
+        $this->pool = $this->repositorySet->createPool();
+
         $this->setupInstalledMap();
+
+        $this->ruleSetGenerator = new RuleSetGenerator($this->policy, $this->pool);
         $this->rules = $this->ruleSetGenerator->getRulesFor($this->jobs, $this->installedMap, $ignorePlatformReqs);
         $this->checkForRootRequireProblems($ignorePlatformReqs);
         $this->decisions = new Decisions($this->pool);

src/Composer/EventDispatcher/EventDispatcher.php

@@ -13,13 +13,13 @@
 namespace Composer\EventDispatcher;
 
 use Composer\DependencyResolver\PolicyInterface;
-use Composer\DependencyResolver\Pool;
 use Composer\DependencyResolver\Request;
 use Composer\Installer\InstallerEvent;
 use Composer\IO\IOInterface;
 use Composer\Composer;
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\Repository\CompositeRepository;
+use Composer\Repository\RepositorySet;
 use Composer\Script;
 use Composer\Installer\PackageEvent;
 use Composer\Installer\BinaryInstaller;
@@ -102,7 +102,7 @@ class EventDispatcher
      * @param string              $eventName     The constant in PackageEvents
      * @param bool                $devMode       Whether or not we are in dev mode
      * @param PolicyInterface     $policy        The policy
-     * @param Pool                $pool          The pool
+     * @param RepositorySet       $repositorySet The repository set
      * @param CompositeRepository $installedRepo The installed repository
      * @param Request             $request       The request
      * @param array               $operations    The list of operations
@@ -111,9 +111,9 @@ class EventDispatcher
      * @return int return code of the executed script if any, for php scripts a false return
      *             value is changed to 1, anything else to 0
      */
-    public function dispatchPackageEvent($eventName, $devMode, PolicyInterface $policy, Pool $pool, CompositeRepository $installedRepo, Request $request, array $operations, OperationInterface $operation)
+    public function dispatchPackageEvent($eventName, $devMode, PolicyInterface $policy, RepositorySet $repositorySet, CompositeRepository $installedRepo, Request $request, array $operations, OperationInterface $operation)
     {
-        return $this->doDispatch(new PackageEvent($eventName, $this->composer, $this->io, $devMode, $policy, $pool, $installedRepo, $request, $operations, $operation));
+        return $this->doDispatch(new PackageEvent($eventName, $this->composer, $this->io, $devMode, $policy, $repositorySet, $installedRepo, $request, $operations, $operation));
     }
 
     /**
@@ -122,7 +122,7 @@ class EventDispatcher
      * @param string              $eventName     The constant in InstallerEvents
      * @param bool                $devMode       Whether or not we are in dev mode
      * @param PolicyInterface     $policy        The policy
-     * @param Pool                $pool          The pool
+     * @param RepositorySet       $repositorySet The repository set
      * @param CompositeRepository $installedRepo The installed repository
      * @param Request             $request       The request
      * @param array               $operations    The list of operations
@@ -130,9 +130,9 @@ class EventDispatcher
      * @return int return code of the executed script if any, for php scripts a false return
      *             value is changed to 1, anything else to 0
      */
-    public function dispatchInstallerEvent($eventName, $devMode, PolicyInterface $policy, Pool $pool, CompositeRepository $installedRepo, Request $request, array $operations = array())
+    public function dispatchInstallerEvent($eventName, $devMode, PolicyInterface $policy, RepositorySet $repositorySet, CompositeRepository $installedRepo, Request $request, array $operations = array())
     {
-        return $this->doDispatch(new InstallerEvent($eventName, $this->composer, $this->io, $devMode, $policy, $pool, $installedRepo, $request, $operations));
+        return $this->doDispatch(new InstallerEvent($eventName, $this->composer, $this->io, $devMode, $policy, $repositorySet, $installedRepo, $request, $operations));
     }
 
     /**
@@ -340,7 +340,7 @@ class EventDispatcher
                 $event->getIO(),
                 $event->isDevMode(),
                 $event->getPolicy(),
-                $event->getPool(),
+                $event->getRepositorySet(),
                 $event->getInstalledRepo(),
                 $event->getRequest(),
                 $event->getOperations(),

src/Composer/Installer.php

@@ -37,6 +37,7 @@ use Composer\Package\CompletePackage;
 use Composer\Package\Link;
 use Composer\Package\Loader\ArrayLoader;
 use Composer\Package\Dumper\ArrayDumper;
+use Composer\Repository\RepositorySet;
 use Composer\Semver\Constraint\Constraint;
 use Composer\Package\Locker;
 use Composer\Package\PackageInterface;
@@ -368,21 +369,21 @@ class Installer
 
         $this->io->writeError('<info>Loading composer repositories with package information</info>');
 
-        // creating repository pool
+        // creating repository set
         $policy = $this->createPolicy();
-        $pool = $this->createPool($this->update ? null : $lockedRepository);
-        $pool->addRepository($installedRepo, $aliases);
+        $repositorySet = $this->createRepositorySet($this->update ? null : $lockedRepository);
+        $repositorySet->addRepository($installedRepo, $aliases);
         if ($this->update) {
             $repositories = $this->repositoryManager->getRepositories();
             foreach ($repositories as $repository) {
-                $pool->addRepository($repository, $aliases);
+                $repositorySet->addRepository($repository, $aliases);
             }
         }
         // Add the locked repository after the others in case we are doing a
         // partial update so missing packages can be found there still.
         // For installs from lock it's the only one added so it is first
         if ($lockedRepository) {
-            $pool->addRepository($lockedRepository, $aliases);
+            $repositorySet->addRepository($lockedRepository, $aliases);
         }
 
         // creating requirements request
@@ -393,7 +394,7 @@ class Installer
             $removedUnstablePackages = array();
             foreach ($localRepo->getPackages() as $package) {
                 if (
-                    !$pool->isPackageAcceptable($package->getNames(), $package->getStability())
+                    !$repositorySet->isPackageAcceptable($package->getNames(), $package->getStability())
                     && $this->installationManager->isPackageInstalled($localRepo, $package)
                 ) {
                     $removedUnstablePackages[$package->getName()] = true;
@@ -465,11 +466,11 @@ class Installer
         }
 
         // force dev packages to have the latest links if we update or install from a (potentially new) lock
-        $this->processDevPackages($localRepo, $pool, $policy, $repositories, $installedRepo, $lockedRepository, 'force-links');
+        $this->processDevPackages($localRepo, $repositorySet, $policy, $repositories, $installedRepo, $lockedRepository, 'force-links');
 
         // solve dependencies
-        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::PRE_DEPENDENCIES_SOLVING, $this->devMode, $policy, $pool, $installedRepo, $request);
-        $solver = new Solver($policy, $pool, $installedRepo, $this->io);
+        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::PRE_DEPENDENCIES_SOLVING, $this->devMode, $policy, $repositorySet, $installedRepo, $request);
+        $solver = new Solver($policy, $repositorySet, $installedRepo, $this->io);
         try {
             $operations = $solver->solve($request, $this->ignorePlatformReqs);
         } catch (SolverProblemsException $e) {
@@ -483,11 +484,10 @@ class Installer
         }
 
         // force dev packages to be updated if we update or install from a (potentially new) lock
-        $operations = $this->processDevPackages($localRepo, $pool, $policy, $repositories, $installedRepo, $lockedRepository, 'force-updates', $operations);
+        $operations = $this->processDevPackages($localRepo, $repositorySet, $policy, $repositories, $installedRepo, $lockedRepository, 'force-updates', $operations);
 
-        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::POST_DEPENDENCIES_SOLVING, $this->devMode, $policy, $pool, $installedRepo, $request, $operations);
+        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::POST_DEPENDENCIES_SOLVING, $this->devMode, $policy, $repositorySet, $installedRepo, $request, $operations);
 
-        $this->io->writeError("Analyzed ".count($pool)." packages to resolve dependencies", true, IOInterface::VERBOSE);
         $this->io->writeError("Analyzed ".$solver->getRuleSetSize()." rules to resolve dependencies", true, IOInterface::VERBOSE);
 
         // execute operations
@@ -581,7 +581,7 @@ class Installer
 
             $event = 'Composer\Installer\PackageEvents::PRE_PACKAGE_'.strtoupper($jobType);
             if (defined($event) && $this->runScripts) {
-                $this->eventDispatcher->dispatchPackageEvent(constant($event), $this->devMode, $policy, $pool, $installedRepo, $request, $operations, $operation);
+                $this->eventDispatcher->dispatchPackageEvent(constant($event), $this->devMode, $policy, $repositorySet, $installedRepo, $request, $operations, $operation);
             }
 
             // output non-alias ops when not executing operations (i.e. dry run), output alias ops in debug verbosity
@@ -599,11 +599,11 @@ class Installer
                 if ($reason instanceof Rule) {
                     switch ($reason->getReason()) {
                         case Rule::RULE_JOB_INSTALL:
-                            $this->io->writeError('    REASON: Required by the root package: '.$reason->getPrettyString($pool));
+                            $this->io->writeError('    REASON: Required by the root package: '.$reason->getPrettyString($solver->getPool()));
                             $this->io->writeError('');
                             break;
                         case Rule::RULE_PACKAGE_REQUIRES:
-                            $this->io->writeError('    REASON: '.$reason->getPrettyString($pool));
+                            $this->io->writeError('    REASON: '.$reason->getPrettyString($solver->getPool()));
                             $this->io->writeError('');
                             break;
                     }
@@ -612,7 +612,7 @@ class Installer
 
             $event = 'Composer\Installer\PackageEvents::POST_PACKAGE_'.strtoupper($jobType);
             if (defined($event) && $this->runScripts) {
-                $this->eventDispatcher->dispatchPackageEvent(constant($event), $this->devMode, $policy, $pool, $installedRepo, $request, $operations, $operation);
+                $this->eventDispatcher->dispatchPackageEvent(constant($event), $this->devMode, $policy, $repositorySet, $installedRepo, $request, $operations, $operation);
             }
 
             if ($this->executeOperations || $this->writeLock) {
@@ -622,7 +622,7 @@ class Installer
 
         if ($this->executeOperations) {
             // force source/dist urls to be updated for all packages
-            $this->processPackageUrls($pool, $policy, $localRepo, $repositories);
+            $this->processPackageUrls($repositorySet, $policy, $localRepo, $repositories);
             $localRepo->write();
         }
 
@@ -685,9 +685,9 @@ class Installer
         unset($tempLocalRepo, $loader, $dumper);
 
         $policy = $this->createPolicy();
-        $pool = $this->createPool();
+        $repositorySet = $this->createRepositorySet();
         $installedRepo = $this->createInstalledRepo($localRepo, $platformRepo);
-        $pool->addRepository($installedRepo, $aliases);
+        $repositorySet->addRepository($installedRepo, $aliases);
 
         // creating requirements request without dev requirements
         $request = $this->createRequest($this->package, $platformRepo);
@@ -697,10 +697,10 @@ class Installer
         }
 
         // solve deps to see which get removed
-        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::PRE_DEPENDENCIES_SOLVING, false, $policy, $pool, $installedRepo, $request);
-        $solver = new Solver($policy, $pool, $installedRepo, $this->io);
+        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::PRE_DEPENDENCIES_SOLVING, false, $policy, $repositorySet, $installedRepo, $request);
+        $solver = new Solver($policy, $repositorySet, $installedRepo, $this->io);
         $ops = $solver->solve($request, $this->ignorePlatformReqs);
-        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::POST_DEPENDENCIES_SOLVING, false, $policy, $pool, $installedRepo, $request, $ops);
+        $this->eventDispatcher->dispatchInstallerEvent(InstallerEvents::POST_DEPENDENCIES_SOLVING, false, $policy, $repositorySet, $installedRepo, $request, $ops);
 
         $devPackages = array();
         foreach ($ops as $op) {
@@ -844,6 +844,12 @@ class Installer
         return $installedRepo;
     }
 
+    private function createRepositorySet($lockedRepository = null)
+    {
+        $pool = $this->createPool($lockedRepository);
+        return new RepositorySet($pool);
+    }
+
     /**
      * @param  RepositoryInterface|null $lockedRepository
      * @return Pool
@@ -946,7 +952,7 @@ class Installer
 
     /**
      * @param  WritableRepositoryInterface $localRepo
-     * @param  Pool                        $pool
+     * @param  RepositorySet               $repositorySet
      * @param  PolicyInterface             $policy
      * @param  array                       $repositories
      * @param  RepositoryInterface         $installedRepo
@@ -955,7 +961,7 @@ class Installer
      * @param  array|null                  $operations
      * @return array
      */
-    private function processDevPackages($localRepo, $pool, $policy, $repositories, $installedRepo, $lockedRepository, $task, array $operations = null)
+    private function processDevPackages($localRepo, $repositorySet, $policy, $repositories, $installedRepo, $lockedRepository, $task, array $operations = null)
     {
         if ($task === 'force-updates' && null === $operations) {
             throw new \InvalidArgumentException('Missing operations argument');
@@ -1010,7 +1016,7 @@ class Installer
                 }
 
                 // find similar packages (name/version) in all repositories
-                $matches = $pool->whatProvides($package->getName(), new Constraint('=', $package->getVersion()));
+                $matches = $repositorySet->findPackages($package->getName(), new Constraint('=', $package->getVersion()));
                 foreach ($matches as $index => $match) {
                     // skip local packages
                     if (!in_array($match->getRepository(), $repositories, true)) {
@@ -1018,18 +1024,12 @@ class Installer
                         continue;
                     }
 
-                    // skip providers/replacers
-                    if ($match->getName() !== $package->getName()) {
-                        unset($matches[$index]);
-                        continue;
-                    }
-
                     $matches[$index] = $match->getId();
                 }
 
                 // select preferred package according to policy rules
-                if ($matches && $matches = $policy->selectPreferredPackages($pool, array(), $matches)) {
-                    $newPackage = $pool->literalToPackage($matches[0]);
+                if ($matches && $matches = $policy->selectPreferredPackages($repositorySet->getPoolTemp(), array(), $matches)) { // TODO remove temp call
+                    $newPackage = $repositorySet->getPoolTemp()->literalToPackage($matches[0]);
 
                     if ($task === 'force-links' && $newPackage) {
                         $package->setRequires($newPackage->getRequires());
@@ -1130,12 +1130,12 @@ class Installer
     }
 
     /**
-     * @param Pool                        $pool
+     * @param RepositorySet               $repositorySet
      * @param PolicyInterface             $policy
      * @param WritableRepositoryInterface $localRepo
      * @param array                       $repositories
      */
-    private function processPackageUrls($pool, $policy, $localRepo, $repositories)
+    private function processPackageUrls($repositorySet, $policy, $localRepo, $repositories)
     {
         if (!$this->update) {
             return;
@@ -1145,7 +1145,7 @@ class Installer
 
         foreach ($localRepo->getCanonicalPackages() as $package) {
             // find similar packages (name/version) in all repositories
-            $matches = $pool->whatProvides($package->getName(), new Constraint('=', $package->getVersion()));
+            $matches = $repositorySet->findPackages($package->getName(), new Constraint('=', $package->getVersion()));
             foreach ($matches as $index => $match) {
                 // skip local packages
                 if (!in_array($match->getRepository(), $repositories, true)) {
@@ -1153,18 +1153,12 @@ class Installer
                     continue;
                 }
 
-                // skip providers/replacers
-                if ($match->getName() !== $package->getName()) {
-                    unset($matches[$index]);
-                    continue;
-                }
-
                 $matches[$index] = $match->getId();
             }
 
             // select preferred package according to policy rules
-            if ($matches && $matches = $policy->selectPreferredPackages($pool, array(), $matches)) {
-                $newPackage = $pool->literalToPackage($matches[0]);
+            if ($matches && $matches = $policy->selectPreferredPackages($repositorySet->getPoolTemp(), array(), $matches)) { // TODO get rid of pool
+                $newPackage = $repositorySet->getPoolTemp()->literalToPackage($matches[0]);
 
                 // update the dist and source URLs
                 $sourceUrl = $package->getSourceUrl();
@@ -1325,8 +1319,8 @@ class Installer
             }
         }
 
-        $pool = new Pool('dev');
-        $pool->addRepository($localOrLockRepo);
+        $repositorySet = new RepositorySet(new Pool('dev'));
+        $repositorySet->addRepository($localOrLockRepo);
 
         $seen = array();
 
@@ -1335,7 +1329,7 @@ class Installer
         foreach ($this->updateWhitelist as $packageName => $void) {
             $packageQueue = new \SplQueue;
 
-            $depPackages = $pool->whatProvides($packageName);
+            $depPackages = $repositorySet->findPackages($packageName); // TODO does this need replacers/providers?
 
             $nameMatchesRequiredPackage = in_array($packageName, $requiredPackageNames, true);
 
@@ -1374,7 +1368,7 @@ class Installer
                 $requires = $package->getRequires();
 
                 foreach ($requires as $require) {
-                    $requirePackages = $pool->whatProvides($require->getTarget());
+                    $requirePackages = $repositorySet->findPackages($require->getTarget()); // TODO does this need replacers/providers?
 
                     foreach ($requirePackages as $requirePackage) {
                         if (isset($this->updateWhitelist[$requirePackage->getName()])) {

src/Composer/Installer/InstallerEvent.php

@@ -15,11 +15,11 @@ namespace Composer\Installer;
 use Composer\Composer;
 use Composer\DependencyResolver\PolicyInterface;
 use Composer\DependencyResolver\Operation\OperationInterface;
-use Composer\DependencyResolver\Pool;
 use Composer\DependencyResolver\Request;
 use Composer\EventDispatcher\Event;
 use Composer\IO\IOInterface;
 use Composer\Repository\CompositeRepository;
+use Composer\Repository\RepositorySet;
 
 /**
  * An event for all installer.
@@ -49,9 +49,9 @@ class InstallerEvent extends Event
     private $policy;
 
     /**
-     * @var Pool
+     * @var RepositorySet
      */
-    private $pool;
+    private $repositorySet;
 
     /**
      * @var CompositeRepository
@@ -76,12 +76,12 @@ class InstallerEvent extends Event
      * @param IOInterface          $io
      * @param bool                 $devMode
      * @param PolicyInterface      $policy
-     * @param Pool                 $pool
+     * @param RepositorySet        $repositorySet
      * @param CompositeRepository  $installedRepo
      * @param Request              $request
      * @param OperationInterface[] $operations
      */
-    public function __construct($eventName, Composer $composer, IOInterface $io, $devMode, PolicyInterface $policy, Pool $pool, CompositeRepository $installedRepo, Request $request, array $operations = array())
+    public function __construct($eventName, Composer $composer, IOInterface $io, $devMode, PolicyInterface $policy, RepositorySet $repositorySet, CompositeRepository $installedRepo, Request $request, array $operations = array())
     {
         parent::__construct($eventName);
 
@@ -89,7 +89,7 @@ class InstallerEvent extends Event
         $this->io = $io;
         $this->devMode = $devMode;
         $this->policy = $policy;
-        $this->pool = $pool;
+        $this->repositorySet = $repositorySet;
         $this->installedRepo = $installedRepo;
         $this->request = $request;
         $this->operations = $operations;
@@ -128,11 +128,11 @@ class InstallerEvent extends Event
     }
 
     /**
-     * @return Pool
+     * @return RepositorySet
      */
-    public function getPool()
+    public function getRepositorySet()
     {
-        return $this->pool;
+        return $this->repositorySet;
     }
 
     /**

src/Composer/Installer/PackageEvent.php

@@ -16,7 +16,6 @@ use Composer\Composer;
 use Composer\IO\IOInterface;
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\DependencyResolver\PolicyInterface;
-use Composer\DependencyResolver\Pool;
 use Composer\DependencyResolver\Request;
 use Composer\Repository\CompositeRepository;
 
@@ -40,15 +39,15 @@ class PackageEvent extends InstallerEvent
      * @param IOInterface          $io
      * @param bool                 $devMode
      * @param PolicyInterface      $policy
-     * @param Pool                 $pool
+     * @param RepositorySet        $repositorySet
      * @param CompositeRepository  $installedRepo
      * @param Request              $request
      * @param OperationInterface[] $operations
      * @param OperationInterface   $operation
      */
-    public function __construct($eventName, Composer $composer, IOInterface $io, $devMode, PolicyInterface $policy, Pool $pool, CompositeRepository $installedRepo, Request $request, array $operations, OperationInterface $operation)
+    public function __construct($eventName, Composer $composer, IOInterface $io, $devMode, PolicyInterface $policy, RepositorySet $repositorySet, CompositeRepository $installedRepo, Request $request, array $operations, OperationInterface $operation)
     {
-        parent::__construct($eventName, $composer, $io, $devMode, $policy, $pool, $installedRepo, $request, $operations);
+        parent::__construct($eventName, $composer, $io, $devMode, $policy, $repositorySet, $installedRepo, $request, $operations);
 
         $this->operation = $operation;
     }

src/Composer/Package/Version/VersionSelector.php

@@ -17,6 +17,7 @@ use Composer\Package\BasePackage;
 use Composer\Package\PackageInterface;
 use Composer\Package\Loader\ArrayLoader;
 use Composer\Package\Dumper\ArrayDumper;
+use Composer\Repository\RepositorySet;
 use Composer\Semver\Constraint\Constraint;
 
 /**
@@ -27,13 +28,13 @@ use Composer\Semver\Constraint\Constraint;
  */
 class VersionSelector
 {
-    private $pool;
+    private $repositorySet;
 
     private $parser;
 
-    public function __construct(Pool $pool)
+    public function __construct(RepositorySet $repositorySet)
     {
-        $this->pool = $pool;
+        $this->repositorySet = $repositorySet;
     }
 
     /**
@@ -49,7 +50,7 @@ class VersionSelector
     public function findBestCandidate($packageName, $targetPackageVersion = null, $targetPhpVersion = null, $preferredStability = 'stable')
     {
         $constraint = $targetPackageVersion ? $this->getParser()->parseConstraints($targetPackageVersion) : null;
-        $candidates = $this->pool->whatProvides(strtolower($packageName), $constraint, true);
+        $candidates = $this->repositorySet->findPackages(strtolower($packageName), $constraint);
 
         if ($targetPhpVersion) {
             $phpConstraint = new Constraint('==', $this->getParser()->normalize($targetPhpVersion));

src/Composer/Plugin/PluginInterface.php

@@ -27,7 +27,7 @@ interface PluginInterface
      *
      * @var string
      */
-    const PLUGIN_API_VERSION = '1.1.0';
+    const PLUGIN_API_VERSION = '2.0.0';
 
     /**
      * Apply plugin modifications to Composer

src/Composer/Plugin/PluginManager.php

@@ -21,6 +21,7 @@ use Composer\Repository\RepositoryInterface;
 use Composer\Package\AliasPackage;
 use Composer\Package\PackageInterface;
 use Composer\Package\Link;
+use Composer\Repository\RepositorySet;
 use Composer\Semver\Constraint\Constraint;
 use Composer\DependencyResolver\Pool;
 use Composer\Plugin\Capability\Capability;
@@ -157,14 +158,14 @@ class PluginManager
         $localRepo = $this->composer->getRepositoryManager()->getLocalRepository();
         $globalRepo = $this->globalComposer ? $this->globalComposer->getRepositoryManager()->getLocalRepository() : null;
 
-        $pool = new Pool('dev');
-        $pool->addRepository($localRepo);
+        $repositorySet = new RepositorySet(new Pool('dev'));
+        $repositorySet->addRepository($localRepo);
         if ($globalRepo) {
-            $pool->addRepository($globalRepo);
+            $repositorySet->addRepository($globalRepo);
         }
 
         $autoloadPackages = array($package->getName() => $package);
-        $autoloadPackages = $this->collectDependencies($pool, $autoloadPackages, $package);
+        $autoloadPackages = $this->collectDependencies($repositorySet, $autoloadPackages, $package);
 
         $generator = $this->composer->getAutoloadGenerator();
         $autoloads = array();
@@ -269,13 +270,13 @@ class PluginManager
     /**
      * Recursively generates a map of package names to packages for all deps
      *
-     * @param Pool             $pool      Package pool of installed packages
-     * @param array            $collected Current state of the map for recursion
-     * @param PackageInterface $package   The package to analyze
+     * @param RepositorySet    $repositorySet Repository set of installed packages
+     * @param array            $collected     Current state of the map for recursion
+     * @param PackageInterface $package       The package to analyze
      *
      * @return array Map of package names to packages
      */
-    private function collectDependencies(Pool $pool, array $collected, PackageInterface $package)
+    private function collectDependencies(RepositorySet $repositorySet, array $collected, PackageInterface $package)
     {
         $requires = array_merge(
             $package->getRequires(),
@@ -283,10 +284,10 @@ class PluginManager
         );
 
         foreach ($requires as $requireLink) {
-            $requiredPackage = $this->lookupInstalledPackage($pool, $requireLink);
+            $requiredPackage = $this->lookupInstalledPackage($repositorySet, $requireLink);
             if ($requiredPackage && !isset($collected[$requiredPackage->getName()])) {
                 $collected[$requiredPackage->getName()] = $requiredPackage;
-                $collected = $this->collectDependencies($pool, $collected, $requiredPackage);
+                $collected = $this->collectDependencies($repositorySet, $collected, $requiredPackage);
             }
         }
 
@@ -294,18 +295,18 @@ class PluginManager
     }
 
     /**
-     * Resolves a package link to a package in the installed pool
+     * Resolves a package link to a package in the installed repo set
      *
      * Since dependencies are already installed this should always find one.
      *
-     * @param Pool $pool Pool of installed packages only
+     * @param RepositorySet $repositorySet Repository set of installed packages only
      * @param Link $link Package link to look up
      *
      * @return PackageInterface|null The found package
      */
-    private function lookupInstalledPackage(Pool $pool, Link $link)
+    private function lookupInstalledPackage(RepositorySet $repositorySet, Link $link)
     {
-        $packages = $pool->whatProvides($link->getTarget(), $link->getConstraint());
+        $packages = $repositorySet->findPackages($link->getTarget(), $link->getConstraint()); // TODO this no longer returns providers
 
         return !empty($packages) ? $packages[0] : null;
     }

src/Composer/Repository/RepositorySet.php

@@ -0,0 +1,59 @@
+<?php
+
+/*
+ * This file is part of Composer.
+ *
+ * (c) Nils Adermann <naderman@naderman.de>
+ *     Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Composer\Repository;
+
+use Composer\DependencyResolver\Pool;
+use Composer\Package\BasePackage;
+use Composer\Package\Version\VersionParser;
+use Composer\Repository\CompositeRepository;
+use Composer\Repository\PlatformRepository;
+use Composer\Semver\Constraint\ConstraintInterface;
+
+/**
+ * @author Nils Adermann <naderman@naderman.de>
+ */
+class RepositorySet
+{
+    private $pool;
+
+    public function __construct(Pool $pool)
+    {
+        $this->pool = $pool;
+    }
+
+    public function addRepository(RepositoryInterface $repo, $rootAliases = array())
+    {
+        return $this->pool->addRepository($repo, $rootAliases);
+    }
+
+    public function isPackageAcceptable($name, $stability)
+    {
+        return $this->pool->isPackageAcceptable($name, $stability);
+    }
+
+    public function findPackages($name, ConstraintInterface $constraint = null)
+    {
+        return $this->pool->whatProvides($name, $constraint, true);
+    }
+
+    public function createPool()
+    {
+        return $this->pool;
+    }
+
+    // TODO get rid of this function
+    public function getPoolTemp()
+    {
+        return $this->pool;
+    }
+}

tests/Composer/Test/DependencyResolver/SolverTest.php

@@ -20,12 +20,13 @@ use Composer\DependencyResolver\Request;
 use Composer\DependencyResolver\Solver;
 use Composer\DependencyResolver\SolverProblemsException;
 use Composer\Package\Link;
+use Composer\Repository\RepositorySet;
 use Composer\TestCase;
 use Composer\Semver\Constraint\MultiConstraint;
 
 class SolverTest extends TestCase
 {
-    protected $pool;
+    protected $repoSet;
     protected $repo;
     protected $repoInstalled;
     protected $request;
@@ -33,13 +34,13 @@ class SolverTest extends TestCase
 
     public function setUp()
     {
-        $this->pool = new Pool;
+        $this->repoSet = new RepositorySet(new Pool);
         $this->repo = new ArrayRepository;
         $this->repoInstalled = new ArrayRepository;
 
-        $this->request = new Request($this->pool);
+        $this->request = new Request($this->repoSet);
         $this->policy = new DefaultPolicy;
-        $this->solver = new Solver($this->policy, $this->pool, $this->repoInstalled, new NullIO());
+        $this->solver = new Solver($this->policy, $this->repoSet, $this->repoInstalled, new NullIO());
     }
 
     public function testSolverInstallSingle()
@@ -90,9 +91,9 @@ class SolverTest extends TestCase
         $repo1->addPackage($foo1 = $this->getPackage('foo', '1'));
         $repo2->addPackage($foo2 = $this->getPackage('foo', '1'));
 
-        $this->pool->addRepository($this->repoInstalled);
-        $this->pool->addRepository($repo1);
-        $this->pool->addRepository($repo2);
+        $this->repoSet->addRepository($this->repoInstalled);
+        $this->repoSet->addRepository($repo1);
+        $this->repoSet->addRepository($repo2);
 
         $this->request->install('foo');
 
@@ -839,8 +840,8 @@ class SolverTest extends TestCase
 
     protected function reposComplete()
     {
-        $this->pool->addRepository($this->repoInstalled);
-        $this->pool->addRepository($this->repo);
+        $this->repoSet->addRepository($this->repoInstalled);
+        $this->repoSet->addRepository($this->repo);
     }
 
     protected function checkSolverResult(array $expected)

tests/Composer/Test/EventDispatcher/EventDispatcherTest.php

@@ -411,12 +411,12 @@ class EventDispatcherTest extends TestCase
             ->will($this->returnValue(array()));
 
         $policy = $this->getMockBuilder('Composer\DependencyResolver\PolicyInterface')->getMock();
-        $pool = $this->getMockBuilder('Composer\DependencyResolver\Pool')->disableOriginalConstructor()->getMock();
+        $repositorySet = $this->getMockBuilder('Composer\Repository\RepositorySet')->disableOriginalConstructor()->getMock();
         $installedRepo = $this->getMockBuilder('Composer\Repository\CompositeRepository')->disableOriginalConstructor()->getMock();
         $request = $this->getMockBuilder('Composer\DependencyResolver\Request')->disableOriginalConstructor()->getMock();
 
-        $dispatcher->dispatchInstallerEvent(InstallerEvents::PRE_DEPENDENCIES_SOLVING, true, $policy, $pool, $installedRepo, $request);
-        $dispatcher->dispatchInstallerEvent(InstallerEvents::POST_DEPENDENCIES_SOLVING, true, $policy, $pool, $installedRepo, $request, array());
+        $dispatcher->dispatchInstallerEvent(InstallerEvents::PRE_DEPENDENCIES_SOLVING, true, $policy, $repositorySet, $installedRepo, $request);
+        $dispatcher->dispatchInstallerEvent(InstallerEvents::POST_DEPENDENCIES_SOLVING, true, $policy, $repositorySet, $installedRepo, $request, array());
     }
 
     public static function call()

tests/Composer/Test/Installer/InstallerEventTest.php

@@ -22,18 +22,18 @@ class InstallerEventTest extends TestCase
         $composer = $this->getMockBuilder('Composer\Composer')->getMock();
         $io = $this->getMockBuilder('Composer\IO\IOInterface')->getMock();
         $policy = $this->getMockBuilder('Composer\DependencyResolver\PolicyInterface')->getMock();
-        $pool = $this->getMockBuilder('Composer\DependencyResolver\Pool')->disableOriginalConstructor()->getMock();
+        $repositorySet = $this->getMockBuilder('Composer\Repository\RepositorySet')->disableOriginalConstructor()->getMock();
         $installedRepo = $this->getMockBuilder('Composer\Repository\CompositeRepository')->disableOriginalConstructor()->getMock();
         $request = $this->getMockBuilder('Composer\DependencyResolver\Request')->disableOriginalConstructor()->getMock();
         $operations = array($this->getMockBuilder('Composer\DependencyResolver\Operation\OperationInterface')->getMock());
-        $event = new InstallerEvent('EVENT_NAME', $composer, $io, true, $policy, $pool, $installedRepo, $request, $operations);
+        $event = new InstallerEvent('EVENT_NAME', $composer, $io, true, $policy, $repositorySet, $installedRepo, $request, $operations);
 
         $this->assertSame('EVENT_NAME', $event->getName());
         $this->assertInstanceOf('Composer\Composer', $event->getComposer());
         $this->assertInstanceOf('Composer\IO\IOInterface', $event->getIO());
         $this->assertTrue($event->isDevMode());
         $this->assertInstanceOf('Composer\DependencyResolver\PolicyInterface', $event->getPolicy());
-        $this->assertInstanceOf('Composer\DependencyResolver\Pool', $event->getPool());
+        $this->assertInstanceOf('Composer\Repository\RepositorySet', $event->getRepositorySet());
         $this->assertInstanceOf('Composer\Repository\CompositeRepository', $event->getInstalledRepo());
         $this->assertInstanceOf('Composer\DependencyResolver\Request', $event->getRequest());
         $this->assertCount(1, $event->getOperations());

tests/Composer/Test/Package/Version/VersionSelectorTest.php

@@ -21,7 +21,7 @@ use PHPUnit\Framework\TestCase;
 class VersionSelectorTest extends TestCase
 {
     // A) multiple versions, get the latest one
-    // B) targetPackageVersion will pass to pool
+    // B) targetPackageVersion will pass to repo set
     // C) No results, throw exception
 
     public function testLatestVersionIsReturned()
@@ -33,13 +33,13 @@ class VersionSelectorTest extends TestCase
         $package3 = $this->createPackage('1.2.0');
         $packages = array($package1, $package2, $package3);
 
-        $pool = $this->createMockPool();
-        $pool->expects($this->once())
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->once())
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue($packages));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate($packageName);
 
         // 1.2.2 should be returned because it's the latest of the returned versions
@@ -57,13 +57,13 @@ class VersionSelectorTest extends TestCase
         $package2->setRequires(array('php' => new Link($packageName, 'php', $parser->parseConstraints('>=5.6'), 'requires', '>=5.6')));
         $packages = array($package1, $package2);
 
-        $pool = $this->createMockPool();
-        $pool->expects($this->once())
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->once())
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue($packages));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate($packageName, null, '5.5.0');
 
         $this->assertSame($package1, $best, 'Latest version supporting php 5.5 should be returned (1.0.0)');
@@ -77,13 +77,13 @@ class VersionSelectorTest extends TestCase
         $package2 = $this->createPackage('1.1.0-beta');
         $packages = array($package1, $package2);
 
-        $pool = $this->createMockPool();
-        $pool->expects($this->once())
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->once())
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue($packages));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate($packageName);
 
         $this->assertSame($package1, $best, 'Latest most stable version should be returned (1.0.0)');
@@ -97,18 +97,18 @@ class VersionSelectorTest extends TestCase
         $package2 = $this->createPackage('2.0.0-beta3');
         $packages = array($package1, $package2);
 
-        $pool = $this->createMockPool();
-        $pool->expects($this->at(0))
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->at(0))
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue($packages));
 
-        $pool->expects($this->at(1))
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet->expects($this->at(1))
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue(array_reverse($packages)));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate($packageName, null, null);
         $this->assertSame($package2, $best, 'Expecting 2.0.0-beta3, cause beta is more stable than dev');
 
@@ -124,13 +124,13 @@ class VersionSelectorTest extends TestCase
         $package2 = $this->createPackage('1.1.0-beta');
         $packages = array($package1, $package2);
 
-        $pool = $this->createMockPool();
-        $pool->expects($this->once())
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->once())
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue($packages));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate($packageName, null, null, 'dev');
 
         $this->assertSame($package2, $best, 'Latest version should be returned (1.1.0-beta)');
@@ -145,13 +145,13 @@ class VersionSelectorTest extends TestCase
         $package3 = $this->createPackage('1.2.0-alpha');
         $packages = array($package1, $package2, $package3);
 
-        $pool = $this->createMockPool();
-        $pool->expects($this->once())
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->once())
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue($packages));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate($packageName, null, null, 'beta');
 
         $this->assertSame($package2, $best, 'Latest version should be returned (1.1.0-beta)');
@@ -165,13 +165,13 @@ class VersionSelectorTest extends TestCase
         $package3 = $this->createPackage('1.2.0-alpha');
         $packages = array($package2, $package3);
 
-        $pool = $this->createMockPool();
-        $pool->expects($this->once())
-            ->method('whatProvides')
-            ->with($packageName, null, true)
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->once())
+            ->method('findPackages')
+            ->with($packageName, null)
             ->will($this->returnValue($packages));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate($packageName, null, null, 'stable');
 
         $this->assertSame($package2, $best, 'Latest version should be returned (1.1.0-beta)');
@@ -179,12 +179,12 @@ class VersionSelectorTest extends TestCase
 
     public function testFalseReturnedOnNoPackages()
     {
-        $pool = $this->createMockPool();
-        $pool->expects($this->once())
-            ->method('whatProvides')
+        $repositorySet = $this->createMockRepositorySet();
+        $repositorySet->expects($this->once())
+            ->method('findPackages')
             ->will($this->returnValue(array()));
 
-        $versionSelector = new VersionSelector($pool);
+        $versionSelector = new VersionSelector($repositorySet);
         $best = $versionSelector->findBestCandidate('foobaz');
         $this->assertFalse($best, 'No versions are available returns false');
     }
@@ -194,8 +194,8 @@ class VersionSelectorTest extends TestCase
      */
     public function testFindRecommendedRequireVersion($prettyVersion, $isDev, $stability, $expectedVersion, $branchAlias = null)
     {
-        $pool = $this->createMockPool();
-        $versionSelector = new VersionSelector($pool);
+        $repositorySet = $this->createMockRepositorySet();
+        $versionSelector = new VersionSelector($repositorySet);
         $versionParser = new VersionParser();
 
         $package = $this->getMockBuilder('\Composer\Package\PackageInterface')->getMock();
@@ -273,8 +273,10 @@ class VersionSelectorTest extends TestCase
         return new Package('foo', $parser->normalize($version), $version);
     }
 
-    private function createMockPool()
+    private function createMockRepositorySet()
     {
-        return $this->getMockBuilder('Composer\DependencyResolver\Pool')->getMock();
+        return $this->getMockBuilder('Composer\Repository\RepositorySet')
+            ->disableOriginalConstructor()
+            ->getMock();
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v1/composer.json

@@ -7,6 +7,6 @@
         "class": "Installer\\Plugin"
     },
     "require": {
-        "composer-plugin-api": "^1.0"
+        "composer-plugin-api": "^2.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v2/composer.json

@@ -7,6 +7,6 @@
         "class": "Installer\\Plugin2"
     },
     "require": {
-        "composer-plugin-api": "^1.0"
+        "composer-plugin-api": "^2.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v3/composer.json

@@ -7,6 +7,6 @@
         "class": "Installer\\Plugin2"
     },
     "require": {
-        "composer-plugin-api": "^1.0"
+        "composer-plugin-api": "^2.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v4/composer.json

@@ -10,6 +10,6 @@
         ]
     },
     "require": {
-        "composer-plugin-api": "^1.0"
+        "composer-plugin-api": "^2.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v8/composer.json

@@ -9,6 +9,6 @@
         ]
     },
     "require": {
-        "composer-plugin-api": "1.1.0"
+        "composer-plugin-api": "2.0.0"
     }
 }

tests/Composer/Test/Plugin/Fixtures/plugin-v9/composer.json

@@ -7,6 +7,6 @@
         "class": "Installer\\Plugin"
     },
     "require": {
-        "composer-plugin-api": "^1.0"
+        "composer-plugin-api": "^2.0"
     }
 }