Internalize pool creation in repository set, store root aliases in set

The pool is still exposed too early in a few places which will require
further refactoring

src/Composer/Command/BaseDependencyCommand.php

@@ -12,7 +12,6 @@
 
 namespace Composer\Command;
 
-use Composer\DependencyResolver\Pool;
 use Composer\Package\Link;
 use Composer\Package\PackageInterface;
 use Composer\Repository\ArrayRepository;
@@ -79,7 +78,7 @@ class BaseDependencyCommand extends BaseCommand
             $composer->getRepositoryManager()->getLocalRepository(),
             new PlatformRepository(array(), $platformOverrides),
         ));
-        $repositorySet = new RepositorySet(new Pool());
+        $repositorySet = new RepositorySet();
         $repositorySet->addRepository($repository);
 
         // Parse package name and constraint

src/Composer/Command/CreateProjectCommand.php

@@ -20,7 +20,6 @@ use Composer\Installer\InstallationManager;
 use Composer\Installer\SuggestedPackagesReporter;
 use Composer\IO\IOInterface;
 use Composer\Package\BasePackage;
-use Composer\DependencyResolver\Pool;
 use Composer\DependencyResolver\Operation\InstallOperation;
 use Composer\Package\Version\VersionSelector;
 use Composer\Package\AliasPackage;
@@ -291,7 +290,7 @@ EOT
             throw new \InvalidArgumentException('Invalid stability provided ('.$stability.'), must be one of: '.implode(', ', array_keys(BasePackage::$stabilities)));
         }
 
-        $repositorySet = new RepositorySet(new Pool($stability));
+        $repositorySet = new RepositorySet(array(), $stability);
         $repositorySet->addRepository($sourceRepo);
 
         $phpVersion = null;

src/Composer/Command/InitCommand.php

@@ -12,7 +12,6 @@
 
 namespace Composer\Command;
 
-use Composer\DependencyResolver\Pool;
 use Composer\Factory;
 use Composer\Json\JsonFile;
 use Composer\Package\BasePackage;
@@ -643,7 +642,7 @@ EOT
         $key = $minimumStability ?: 'default';
 
         if (!isset($this->repositorySets[$key])) {
-            $this->repositorySets[$key] = $repositorySet = new RepositorySet(new Pool($minimumStability ?: $this->getMinimumStability($input)));
+            $this->repositorySets[$key] = $repositorySet = new RepositorySet(array(), $minimumStability ?: $this->getMinimumStability($input));
             $repositorySet->addRepository($this->getRepos());
         }
 

src/Composer/Command/ShowCommand.php

@@ -14,7 +14,6 @@ namespace Composer\Command;
 
 use Composer\Composer;
 use Composer\DependencyResolver\DefaultPolicy;
-use Composer\DependencyResolver\Pool;
 use Composer\Json\JsonFile;
 use Composer\Package\BasePackage;
 use Composer\Package\CompletePackageInterface;
@@ -524,7 +523,7 @@ EOT
         $constraint = is_string($version) ? $this->versionParser->parseConstraints($version) : $version;
 
         $policy = new DefaultPolicy();
-        $repositorySet = new RepositorySet(new Pool('dev'));
+        $repositorySet = new RepositorySet(array(), 'dev');
         $repositorySet->addRepository($repos);
 
         $matchedPackage = null;
@@ -985,7 +984,7 @@ EOT
     private function getRepositorySet(Composer $composer)
     {
         if (!$this->repositorySet) {
-            $this->repositorySet = new RepositorySet(new Pool($composer->getPackage()->getMinimumStability(), $composer->getPackage()->getStabilityFlags()));
+            $this->repositorySet = new RepositorySet(array(), $composer->getPackage()->getMinimumStability(), $composer->getPackage()->getStabilityFlags());
             $this->repositorySet->addRepository(new CompositeRepository($composer->getRepositoryManager()->getRepositories()));
         }
 

src/Composer/DependencyResolver/Pool.php

@@ -54,22 +54,12 @@ class Pool implements \Countable
     protected $whitelist = null;
     protected $id = 1;
 
-    public function __construct($minimumStability = 'stable', array $stabilityFlags = array(), array $filterRequires = array())
+    public function __construct(array $acceptableStabilities, array $stabilityFlags = array(), array $filterRequires = array())
     {
-        $this->versionParser = new VersionParser;
+        $this->acceptableStabilities = $acceptableStabilities;
-        $this->acceptableStabilities = array();
-        foreach (BasePackage::$stabilities as $stability => $value) {
-            if ($value <= BasePackage::$stabilities[$minimumStability]) {
-                $this->acceptableStabilities[$stability] = $value;
-            }
-        }
         $this->stabilityFlags = $stabilityFlags;
         $this->filterRequires = $filterRequires;
-        foreach ($filterRequires as $name => $constraint) {
+        $this->versionParser = new VersionParser;
-            if (preg_match(PlatformRepository::PLATFORM_PACKAGE_REGEX, $name)) {
-                unset($this->filterRequires[$name]);
-            }
-        }
     }
 
     public function setWhitelist($whitelist)
@@ -202,7 +192,7 @@ class Pool implements \Countable
         $candidates = array();
 
         foreach ($this->providerRepos as $repo) {
-            foreach ($repo->whatProvides($this, $name, $bypassFilters) as $candidate) {
+            foreach ($repo->whatProvides($name, $bypassFilters, array($this, 'isPackageAcceptable')) as $candidate) {
                 $candidates[] = $candidate;
                 if ($candidate->id < 1) {
                     $candidate->setId($this->id++);

src/Composer/Installer.php

@@ -20,7 +20,6 @@ use Composer\DependencyResolver\Operation\UninstallOperation;
 use Composer\DependencyResolver\Operation\MarkAliasUninstalledOperation;
 use Composer\DependencyResolver\Operation\OperationInterface;
 use Composer\DependencyResolver\PolicyInterface;
-use Composer\DependencyResolver\Pool;
 use Composer\DependencyResolver\Request;
 use Composer\DependencyResolver\Rule;
 use Composer\DependencyResolver\Solver;
@@ -371,19 +370,19 @@ class Installer
 
         // creating repository set
         $policy = $this->createPolicy();
-        $repositorySet = $this->createRepositorySet($this->update ? null : $lockedRepository);
+        $repositorySet = $this->createRepositorySet($aliases, $this->update ? null : $lockedRepository);
-        $repositorySet->addRepository($installedRepo, $aliases);
+        $repositorySet->addRepository($installedRepo);
         if ($this->update) {
             $repositories = $this->repositoryManager->getRepositories();
             foreach ($repositories as $repository) {
-                $repositorySet->addRepository($repository, $aliases);
+                $repositorySet->addRepository($repository);
             }
         }
         // 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) {
-            $repositorySet->addRepository($lockedRepository, $aliases);
+            $repositorySet->addRepository($lockedRepository);
         }
 
         // creating requirements request
@@ -465,6 +464,8 @@ class Installer
             }
         }
 
+        $repositorySet->getPoolTemp(); // TODO remove this, but ensures ids are set before dev packages are processed in advance of solver
+
         // force dev packages to have the latest links if we update or install from a (potentially new) lock
         $this->processDevPackages($localRepo, $repositorySet, $policy, $repositories, $installedRepo, $lockedRepository, 'force-links');
 
@@ -685,9 +686,9 @@ class Installer
         unset($tempLocalRepo, $loader, $dumper);
 
         $policy = $this->createPolicy();
-        $repositorySet = $this->createRepositorySet();
+        $repositorySet = $this->createRepositorySet($aliases);
         $installedRepo = $this->createInstalledRepo($localRepo, $platformRepo);
-        $repositorySet->addRepository($installedRepo, $aliases);
+        $repositorySet->addRepository($installedRepo);
 
         // creating requirements request without dev requirements
         $request = $this->createRequest($this->package, $platformRepo);
@@ -844,17 +845,12 @@ class Installer
         return $installedRepo;
     }
 
-    private function createRepositorySet($lockedRepository = null)
-    {
-        $pool = $this->createPool($lockedRepository);
-        return new RepositorySet($pool);
-    }
-
     /**
-     * @param  RepositoryInterface|null $lockedRepository
+     * @param array $rootAliases
-     * @return Pool
+     * @param RepositoryInterface|null $lockedRepository
+     * @return RepositorySet
      */
-    private function createPool(RepositoryInterface $lockedRepository = null)
+    private function createRepositorySet(array $rootAliases = array(), $lockedRepository = null)
     {
         if ($this->update) {
             $minimumStability = $this->package->getMinimumStability();
@@ -886,7 +882,7 @@ class Installer
             }
         }
 
-        return new Pool($minimumStability, $stabilityFlags, $rootConstraints);
+        return new RepositorySet($rootAliases, $minimumStability, $stabilityFlags, $rootConstraints);
     }
 
     /**
@@ -1319,7 +1315,7 @@ class Installer
             }
         }
 
-        $repositorySet = new RepositorySet(new Pool('dev'));
+        $repositorySet = new RepositorySet(array(), 'dev');
         $repositorySet->addRepository($localOrLockRepo);
 
         $seen = array();
@@ -1354,11 +1350,11 @@ class Installer
 
             while (!$packageQueue->isEmpty()) {
                 $package = $packageQueue->dequeue();
-                if (isset($seen[$package->getId()])) {
+                if (isset($seen[spl_object_hash($package)])) {
                     continue;
                 }
 
-                $seen[$package->getId()] = true;
+                $seen[spl_object_hash($package)] = true;
                 $this->updateWhitelist[$package->getName()] = true;
 
                 if (!$this->whitelistDependencies && !$this->whitelistAllDependencies) {

src/Composer/Plugin/PluginManager.php

@@ -23,7 +23,6 @@ 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;
 
 /**
@@ -158,7 +157,7 @@ class PluginManager
         $localRepo = $this->composer->getRepositoryManager()->getLocalRepository();
         $globalRepo = $this->globalComposer ? $this->globalComposer->getRepositoryManager()->getLocalRepository() : null;
 
-        $repositorySet = new RepositorySet(new Pool('dev'));
+        $repositorySet = new RepositorySet(array(), 'dev');
         $repositorySet->addRepository($localRepo);
         if ($globalRepo) {
             $repositorySet->addRepository($globalRepo);

src/Composer/Repository/ComposerRepository.php

@@ -16,7 +16,6 @@ use Composer\Package\Loader\ArrayLoader;
 use Composer\Package\PackageInterface;
 use Composer\Package\AliasPackage;
 use Composer\Package\Version\VersionParser;
-use Composer\DependencyResolver\Pool;
 use Composer\Json\JsonFile;
 use Composer\Cache;
 use Composer\Config;
@@ -136,7 +135,7 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
 
         foreach ($this->getProviderNames() as $providerName) {
             if ($name === $providerName) {
-                $packages = $this->whatProvides(new Pool('dev'), $providerName);
+                $packages = $this->whatProvides($providerName);
                 foreach ($packages as $package) {
                     if ($name === $package->getName()) {
                         $pkgConstraint = new Constraint('==', $package->getVersion());
@@ -170,7 +169,7 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
 
         foreach ($this->getProviderNames() as $providerName) {
             if ($name === $providerName) {
-                $candidates = $this->whatProvides(new Pool('dev'), $providerName);
+                $candidates = $this->whatProvides($providerName); // TODO what is the point of this?
                 foreach ($candidates as $package) {
                     if ($name === $package->getName()) {
                         $pkgConstraint = new Constraint('==', $package->getVersion());
@@ -289,12 +288,12 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
     }
 
     /**
-     * @param  Pool        $pool
+     * @param string $name package name
-     * @param  string      $name          package name
+     * @param bool $bypassFilters If set to true, this bypasses the stability filtering, and forces a recompute without cache
-     * @param  bool        $bypassFilters If set to true, this bypasses the stability filtering, and forces a recompute without cache
+     * @param callable $isPackageAcceptableCallable
      * @return array|mixed
      */
-    public function whatProvides(Pool $pool, $name, $bypassFilters = false)
+    public function whatProvides($name, $bypassFilters = false, $isPackageAcceptableCallable = null)
     {
         if (isset($this->providers[$name]) && !$bypassFilters) {
             return $this->providers[$name];
@@ -395,7 +394,7 @@ class ComposerRepository extends ArrayRepository implements ConfigurableReposito
                         }
                     }
                 } else {
-                    if (!$bypassFilters && !$pool->isPackageAcceptable(strtolower($version['name']), VersionParser::parseStability($version['version']))) {
+                    if (!$bypassFilters && (!$isPackageAcceptableCallable || !call_user_func($isPackageAcceptableCallable, strtolower($version['name']), VersionParser::parseStability($version['version'])))) {
                         continue;
                     }
 

src/Composer/Repository/RepositorySet.php

@@ -24,36 +24,132 @@ use Composer\Semver\Constraint\ConstraintInterface;
  */
 class RepositorySet
 {
-    private $pool;
+    /** @var array */
+    private $rootAliases;
 
-    public function __construct(Pool $pool)
+    /** @var RepositoryInterface[] */
+    private $repositories;
+
+    /** @var ComposerRepository[] */
+    private $providerRepos;
+
+    private $acceptableStabilities;
+    private $stabilityFlags;
+    protected $filterRequires;
+
+    /** @var Pool */
+    private $pool; // TODO remove this
+
+    public function __construct(array $rootAliases = array(), $minimumStability = 'stable', array $stabilityFlags = array(), array $filterRequires = array())
     {
-        $this->pool = $pool;
+        $this->rootAliases = $rootAliases;
+
+        $this->acceptableStabilities = array();
+        foreach (BasePackage::$stabilities as $stability => $value) {
+            if ($value <= BasePackage::$stabilities[$minimumStability]) {
+                $this->acceptableStabilities[$stability] = $value;
+            }
+        }
+        $this->stabilityFlags = $stabilityFlags;
+        $this->filterRequires = $filterRequires;
+        foreach ($filterRequires as $name => $constraint) {
+            if (preg_match(PlatformRepository::PLATFORM_PACKAGE_REGEX, $name)) {
+                unset($this->filterRequires[$name]);
+            }
+        }
     }
 
-    public function addRepository(RepositoryInterface $repo, $rootAliases = array())
+    /**
+     * Adds a repository to this repository set
+     *
+     * @param RepositoryInterface $repo        A package repository
+     */
+    public function addRepository(RepositoryInterface $repo)
     {
-        return $this->pool->addRepository($repo, $rootAliases);
+        if ($repo instanceof CompositeRepository) {
+            $repos = $repo->getRepositories();
+        } else {
+            $repos = array($repo);
+        }
+
+        foreach ($repos as $repo) {
+            $this->repositories[] = $repo;
+            if ($repo instanceof ComposerRepository && $repo->hasProviders()) {
+                $this->providerRepos[] = $repo;
+            }
+        }
     }
 
     public function isPackageAcceptable($name, $stability)
     {
-        return $this->pool->isPackageAcceptable($name, $stability);
+        foreach ((array) $name as $n) {
+            // allow if package matches the global stability requirement and has no exception
+            if (!isset($this->stabilityFlags[$n]) && isset($this->acceptableStabilities[$stability])) {
+                return true;
+            }
+
+            // allow if package matches the package-specific stability flag
+            if (isset($this->stabilityFlags[$n]) && BasePackage::$stabilities[$stability] <= $this->stabilityFlags[$n]) {
+                return true;
+            }
+        }
+
+        return false;
     }
 
+    /**
+     * Find packages matching name and optionally a constraint in all repositories
+     *
+     * @param $name
+     * @param ConstraintInterface|null $constraint
+     * @return array
+     */
     public function findPackages($name, ConstraintInterface $constraint = null)
     {
-        return $this->pool->whatProvides($name, $constraint, true);
+        $packages = array();
+        foreach ($this->repositories as $repository) {
+            $packages[] = $repository->findPackages($name, $constraint) ?: array();
+        }
+
+        $candidates = $packages ? call_user_func_array('array_merge', $packages) : array();
+
+        $result = array();
+        foreach ($candidates as $candidate) {
+            if ($this->isPackageAcceptable($candidate->getNames(), $candidate->getStability())) {
+                $result[] = $candidate;
+            }
+        }
+
+        return $candidates;
     }
 
+    /**
+     * Create a pool for dependency resolution from the packages in this repository set.
+     *
+     * @return Pool
+     */
     public function createPool()
     {
+        if ($this->pool) {
+            return $this->pool;
+        }
+
+        $this->pool = new Pool($this->acceptableStabilities, $this->stabilityFlags, $this->filterRequires);
+
+        foreach ($this->repositories as $repository) {
+            $this->pool->addRepository($repository, $this->rootAliases);
+        }
+
         return $this->pool;
     }
 
     // TODO get rid of this function
     public function getPoolTemp()
     {
-        return $this->pool;
+        if (!$this->pool) {
+            return $this->createPool();
+        } else {
+            return $this->pool;
+        }
     }
 }

tests/Composer/Test/DependencyResolver/DefaultPolicyTest.php

@@ -18,13 +18,14 @@ use Composer\DependencyResolver\DefaultPolicy;
 use Composer\DependencyResolver\Pool;
 use Composer\Package\Link;
 use Composer\Package\AliasPackage;
+use Composer\Repository\RepositorySet;
 use Composer\Semver\Constraint\Constraint;
 use Composer\TestCase;
 
 class DefaultPolicyTest extends TestCase
 {
-    /** @var Pool */
+    /** @var RepositorySet */
-    protected $pool;
+    protected $repositorySet;
     /** @var ArrayRepository */
     protected $repo;
     /** @var ArrayRepository */
@@ -34,7 +35,7 @@ class DefaultPolicyTest extends TestCase
 
     public function setUp()
     {
-        $this->pool = new Pool('dev');
+        $this->repositorySet = new RepositorySet(array(), 'dev');
         $this->repo = new ArrayRepository;
         $this->repoInstalled = new ArrayRepository;
 
@@ -44,12 +45,14 @@ class DefaultPolicyTest extends TestCase
     public function testSelectSingle()
     {
         $this->repo->addPackage($packageA = $this->getPackage('A', '1.0'));
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA->getId());
         $expected = array($packageA->getId());
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -58,12 +61,14 @@ class DefaultPolicyTest extends TestCase
     {
         $this->repo->addPackage($packageA1 = $this->getPackage('A', '1.0'));
         $this->repo->addPackage($packageA2 = $this->getPackage('A', '2.0'));
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA1->getId(), $packageA2->getId());
         $expected = array($packageA2->getId());
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -72,12 +77,14 @@ class DefaultPolicyTest extends TestCase
     {
         $this->repo->addPackage($packageA1 = $this->getPackage('A', '1.0.0'));
         $this->repo->addPackage($packageA2 = $this->getPackage('A', '1.0.1-alpha'));
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA1->getId(), $packageA2->getId());
         $expected = array($packageA2->getId());
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -86,13 +93,15 @@ class DefaultPolicyTest extends TestCase
     {
         $this->repo->addPackage($packageA1 = $this->getPackage('A', '1.0.0'));
         $this->repo->addPackage($packageA2 = $this->getPackage('A', '1.0.1-alpha'));
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA1->getId(), $packageA2->getId());
         $expected = array($packageA1->getId());
 
         $policy = new DefaultPolicy(true);
-        $selected = $policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -101,12 +110,14 @@ class DefaultPolicyTest extends TestCase
     {
         $this->repo->addPackage($packageA1 = $this->getPackage('A', 'dev-foo'));
         $this->repo->addPackage($packageA2 = $this->getPackage('A', '1.0.0'));
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA1->getId(), $packageA2->getId());
         $expected = array($packageA2->getId());
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -115,13 +126,15 @@ class DefaultPolicyTest extends TestCase
     {
         $this->repo->addPackage($packageA = $this->getPackage('A', '2.0'));
         $this->repoInstalled->addPackage($packageAInstalled = $this->getPackage('A', '1.0'));
-        $this->pool->addRepository($this->repoInstalled);
+        $this->repositorySet->addRepository($this->repoInstalled);
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA->getId(), $packageAInstalled->getId());
         $expected = array($packageA->getId());
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, $this->mapFromRepo($this->repoInstalled), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, $this->mapFromRepo($this->repoInstalled), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -133,14 +146,16 @@ class DefaultPolicyTest extends TestCase
         $this->repo->addPackage($packageA = $this->getPackage('A', '1.0'));
         $otherRepository->addPackage($packageAImportant = $this->getPackage('A', '1.0'));
 
-        $this->pool->addRepository($this->repoInstalled);
+        $this->repositorySet->addRepository($this->repoInstalled);
-        $this->pool->addRepository($otherRepository);
+        $this->repositorySet->addRepository($otherRepository);
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA->getId(), $packageAImportant->getId());
         $expected = array($packageAImportant->getId());
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -155,21 +170,25 @@ class DefaultPolicyTest extends TestCase
         $repo2->addPackage($package3 = $this->getPackage('A', '1.1'));
         $repo2->addPackage($package4 = $this->getPackage('A', '1.2'));
 
-        $this->pool->addRepository($repo1);
+        $this->repositorySet->addRepository($repo1);
-        $this->pool->addRepository($repo2);
+        $this->repositorySet->addRepository($repo2);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($package1->getId(), $package2->getId(), $package3->getId(), $package4->getId());
         $expected = array($package2->getId());
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
 
-        $this->pool = new Pool('dev');
+        $this->repositorySet = new RepositorySet(array(), 'dev');
-        $this->pool->addRepository($repo2);
+        $this->repositorySet->addRepository($repo2);
-        $this->pool->addRepository($repo1);
+        $this->repositorySet->addRepository($repo1);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $expected = array($package4->getId());
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -186,11 +205,13 @@ class DefaultPolicyTest extends TestCase
         $repoImportant->addPackage($packageA2AliasImportant = new AliasPackage($packageA2Important, '2.1.9999999.9999999-dev', '2.1.x-dev'));
         $packageAAliasImportant->setRootPackageAlias(true);
 
-        $this->pool->addRepository($this->repoInstalled);
+        $this->repositorySet->addRepository($this->repoInstalled);
-        $this->pool->addRepository($repoImportant);
+        $this->repositorySet->addRepository($repoImportant);
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
 
-        $packages = $this->pool->whatProvides('a', new Constraint('=', '2.1.9999999.9999999-dev'));
+        $pool = $this->repositorySet->getPoolTemp();
+
+        $packages = $pool->whatProvides('a', new Constraint('=', '2.1.9999999.9999999-dev'));
         $literals = array();
         foreach ($packages as $package) {
             $literals[] = $package->getId();
@@ -198,7 +219,7 @@ class DefaultPolicyTest extends TestCase
 
         $expected = array($packageAAliasImportant->getId());
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -211,12 +232,14 @@ class DefaultPolicyTest extends TestCase
         $packageA->setProvides(array(new Link('A', 'X', new Constraint('==', '1.0'), 'provides')));
         $packageB->setProvides(array(new Link('B', 'X', new Constraint('==', '1.0'), 'provides')));
 
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA->getId(), $packageB->getId());
         $expected = $literals;
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -228,12 +251,14 @@ class DefaultPolicyTest extends TestCase
 
         $packageB->setReplaces(array(new Link('B', 'A', new Constraint('==', '1.0'), 'replaces')));
 
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA->getId(), $packageB->getId());
         $expected = $literals;
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }
@@ -247,12 +272,14 @@ class DefaultPolicyTest extends TestCase
         $packageA->setReplaces(array(new Link('vendor-a/replacer', 'vendor-a/package', new Constraint('==', '1.0'), 'replaces')));
         $packageB->setReplaces(array(new Link('vendor-b/replacer', 'vendor-a/package', new Constraint('==', '1.0'), 'replaces')));
 
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA->getId(), $packageB->getId());
         $expected = $literals;
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals, 'vendor-a/package');
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals, 'vendor-a/package');
         $this->assertEquals($expected, $selected);
 
         // test with reversed order in repo
@@ -260,13 +287,15 @@ class DefaultPolicyTest extends TestCase
         $repo->addPackage($packageA = clone $packageA);
         $repo->addPackage($packageB = clone $packageB);
 
-        $pool = new Pool('dev');
+        $repositorySet = new RepositorySet(array(), 'dev');
-        $pool->addRepository($this->repo);
+        $repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA->getId(), $packageB->getId());
         $expected = $literals;
 
-        $selected = $this->policy->selectPreferredPackages($this->pool, array(), $literals, 'vendor-a/package');
+        $selected = $this->policy->selectPreferredPackages($pool, array(), $literals, 'vendor-a/package');
         $this->assertSame($expected, $selected);
     }
 
@@ -286,12 +315,14 @@ class DefaultPolicyTest extends TestCase
 
         $this->repo->addPackage($packageA1 = $this->getPackage('A', '1.0'));
         $this->repo->addPackage($packageA2 = $this->getPackage('A', '2.0'));
-        $this->pool->addRepository($this->repo);
+        $this->repositorySet->addRepository($this->repo);
+
+        $pool = $this->repositorySet->getPoolTemp();
 
         $literals = array($packageA1->getId(), $packageA2->getId());
         $expected = array($packageA1->getId());
 
-        $selected = $policy->selectPreferredPackages($this->pool, array(), $literals);
+        $selected = $policy->selectPreferredPackages($pool, array(), $literals);
 
         $this->assertSame($expected, $selected);
     }

tests/Composer/Test/DependencyResolver/PoolTest.php

@@ -21,7 +21,7 @@ class PoolTest extends TestCase
 {
     public function testPool()
     {
-        $pool = new Pool;
+        $pool = $this->createPool();
         $repo = new ArrayRepository;
         $package = $this->getPackage('foo', '1');
 
@@ -34,7 +34,7 @@ class PoolTest extends TestCase
 
     public function testPoolIgnoresIrrelevantPackages()
     {
-        $pool = new Pool('stable', array('bar' => BasePackage::STABILITY_BETA));
+        $pool = new Pool(array('stable' => BasePackage::STABILITY_STABLE), array('bar' => BasePackage::STABILITY_BETA));
         $repo = new ArrayRepository;
         $repo->addPackage($package = $this->getPackage('bar', '1'));
         $repo->addPackage($betaPackage = $this->getPackage('bar', '1-beta'));
@@ -53,7 +53,7 @@ class PoolTest extends TestCase
      */
     public function testGetPriorityForNotRegisteredRepository()
     {
-        $pool = new Pool;
+        $pool = $this->createPool();
         $repository = new ArrayRepository;
 
         $pool->getPriority($repository);
@@ -61,7 +61,7 @@ class PoolTest extends TestCase
 
     public function testGetPriorityWhenRepositoryIsRegistered()
     {
-        $pool = new Pool;
+        $pool = $this->createPool();
         $firstRepository = new ArrayRepository;
         $pool->addRepository($firstRepository);
         $secondRepository = new ArrayRepository;
@@ -76,7 +76,7 @@ class PoolTest extends TestCase
 
     public function testWhatProvidesSamePackageForDifferentRepositories()
     {
-        $pool = new Pool;
+        $pool = $this->createPool();
         $firstRepository = new ArrayRepository;
         $secondRepository = new ArrayRepository;
 
@@ -96,7 +96,7 @@ class PoolTest extends TestCase
 
     public function testWhatProvidesPackageWithConstraint()
     {
-        $pool = new Pool;
+        $pool = $this->createPool();
         $repository = new ArrayRepository;
 
         $firstPackage = $this->getPackage('foo', '1');
@@ -113,7 +113,7 @@ class PoolTest extends TestCase
 
     public function testPackageById()
     {
-        $pool = new Pool;
+        $pool = $this->createPool();
         $repository = new ArrayRepository;
         $package = $this->getPackage('foo', '1');
 
@@ -125,8 +125,13 @@ class PoolTest extends TestCase
 
     public function testWhatProvidesWhenPackageCannotBeFound()
     {
-        $pool = new Pool;
+        $pool = $this->createPool();
 
         $this->assertEquals(array(), $pool->whatProvides('foo'));
     }
+
+    protected function createPool()
+    {
+        return new Pool(array('stable' => BasePackage::STABILITY_STABLE));
+    }
 }

tests/Composer/Test/DependencyResolver/RuleSetIteratorTest.php

@@ -17,6 +17,7 @@ use Composer\DependencyResolver\Rule;
 use Composer\DependencyResolver\RuleSet;
 use Composer\DependencyResolver\RuleSetIterator;
 use Composer\DependencyResolver\Pool;
+use Composer\Package\BasePackage;
 use PHPUnit\Framework\TestCase;
 
 class RuleSetIteratorTest extends TestCase
@@ -26,7 +27,7 @@ class RuleSetIteratorTest extends TestCase
 
     protected function setUp()
     {
-        $this->pool = new Pool;
+        $this->pool = new Pool(array('stable' => BasePackage::STABILITY_STABLE));
 
         $this->rules = array(
             RuleSet::TYPE_JOB => array(

tests/Composer/Test/DependencyResolver/RuleSetTest.php

@@ -16,6 +16,7 @@ use Composer\DependencyResolver\GenericRule;
 use Composer\DependencyResolver\Rule;
 use Composer\DependencyResolver\RuleSet;
 use Composer\DependencyResolver\Pool;
+use Composer\Package\BasePackage;
 use Composer\Repository\ArrayRepository;
 use Composer\TestCase;
 
@@ -25,7 +26,7 @@ class RuleSetTest extends TestCase
 
     public function setUp()
     {
-        $this->pool = new Pool;
+        $this->pool = new Pool(array('stable' => BasePackage::STABILITY_STABLE));
     }
 
     public function testAdd()

tests/Composer/Test/DependencyResolver/RuleTest.php

@@ -16,6 +16,7 @@ use Composer\DependencyResolver\GenericRule;
 use Composer\DependencyResolver\Rule;
 use Composer\DependencyResolver\RuleSet;
 use Composer\DependencyResolver\Pool;
+use Composer\Package\BasePackage;
 use Composer\Repository\ArrayRepository;
 use Composer\TestCase;
 
@@ -25,7 +26,7 @@ class RuleTest extends TestCase
 
     public function setUp()
     {
-        $this->pool = new Pool;
+        $this->pool = new Pool(array('stable' => BasePackage::STABILITY_STABLE));
     }
 
     public function testGetHash()

tests/Composer/Test/DependencyResolver/SolverTest.php

@@ -34,7 +34,7 @@ class SolverTest extends TestCase
 
     public function setUp()
     {
-        $this->repoSet = new RepositorySet(new Pool);
+        $this->repoSet = new RepositorySet(array());
         $this->repo = new ArrayRepository;
         $this->repoInstalled = new ArrayRepository;
 

tests/Composer/Test/Plugin/PluginInstallerTest.php

@@ -130,7 +130,7 @@ class PluginInstallerTest extends TestCase
     public function testInstallNewPlugin()
     {
         $this->repository
-            ->expects($this->exactly(2))
+            ->expects($this->once())
             ->method('getPackages')
             ->will($this->returnValue(array()));
         $installer = new PluginInstaller($this->io, $this->composer);
@@ -145,7 +145,7 @@ class PluginInstallerTest extends TestCase
     public function testInstallMultiplePlugins()
     {
         $this->repository
-            ->expects($this->exactly(2))
+            ->expects($this->once())
             ->method('getPackages')
             ->will($this->returnValue(array($this->packages[3])));
         $installer = new PluginInstaller($this->io, $this->composer);
@@ -163,7 +163,7 @@ class PluginInstallerTest extends TestCase
     public function testUpgradeWithNewClassName()
     {
         $this->repository
-            ->expects($this->exactly(3))
+            ->expects($this->once())
             ->method('getPackages')
             ->will($this->returnValue(array($this->packages[0])));
         $this->repository
@@ -182,7 +182,7 @@ class PluginInstallerTest extends TestCase
     public function testUpgradeWithSameClassName()
     {
         $this->repository
-            ->expects($this->exactly(3))
+            ->expects($this->once())
             ->method('getPackages')
             ->will($this->returnValue(array($this->packages[1])));
         $this->repository
@@ -201,7 +201,7 @@ class PluginInstallerTest extends TestCase
     public function testRegisterPluginOnlyOneTime()
     {
         $this->repository
-            ->expects($this->exactly(2))
+            ->expects($this->once())
             ->method('getPackages')
             ->will($this->returnValue(array()));
         $installer = new PluginInstaller($this->io, $this->composer);
@@ -240,11 +240,11 @@ class PluginInstallerTest extends TestCase
 
         // Add the plugins to the repo along with the internal Plugin package on which they all rely.
         $this->repository
-             ->expects($this->any())
+            ->expects($this->any())
-             ->method('getPackages')
+            ->method('getPackages')
-             ->will($this->returnCallback(function () use ($plugApiInternalPackage, $plugins) {
+            ->will($this->returnCallback(function () use ($plugApiInternalPackage, $plugins) {
-                 return array_merge(array($plugApiInternalPackage), $plugins);
+                return array_merge(array($plugApiInternalPackage), $plugins);
-             }));
+            }));
 
         $this->pm->loadInstalledPlugins();
     }
@@ -300,7 +300,7 @@ class PluginInstallerTest extends TestCase
     public function testCommandProviderCapability()
     {
         $this->repository
-            ->expects($this->exactly(2))
+            ->expects($this->once())
             ->method('getPackages')
             ->will($this->returnValue(array($this->packages[7])));
         $installer = new PluginInstaller($this->io, $this->composer);

tests/Composer/Test/Repository/ComposerRepositoryTest.php

@@ -142,11 +142,6 @@ class ComposerRepositoryTest extends TestCase
                 ),
             )));
 
-        $pool = $this->getMockBuilder('Composer\DependencyResolver\Pool')->getMock();
-        $pool->expects($this->any())
-            ->method('isPackageAcceptable')
-            ->will($this->returnValue(true));
-
         $versionParser = new VersionParser();
         $repo->setRootAliases(array(
             'a' => array(
@@ -155,7 +150,7 @@ class ComposerRepositoryTest extends TestCase
             ),
         ));
 
-        $packages = $repo->whatProvides($pool, 'a');
+        $packages = $repo->whatProvides('a', false, array($this, 'isPackageAcceptableReturnTrue'));
 
         $this->assertCount(7, $packages);
         $this->assertEquals(array('1', '1-alias', '2', '2-alias', '2-root', '3', '3-root'), array_keys($packages));
@@ -164,6 +159,11 @@ class ComposerRepositoryTest extends TestCase
         $this->assertSame($packages['2'], $packages['2-alias']->getAliasOf());
     }
 
+    public function isPackageAcceptableReturnTrue()
+    {
+        return true;
+    }
+
     public function testSearchWithType()
     {
         $repoConfig = array(