--- /dev/null
+<?php
+/*
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This software consists of voluntary contributions made by many individuals
+ * and is licensed under the MIT license. For more information, see
+ * <http://www.doctrine-project.org>.
+ */
+
+namespace Doctrine\Common\Persistence;
+
+/**
+ * Contract for a Doctrine persistence layer ObjectManager class to implement.
+ *
+ * @link www.doctrine-project.org
+ * @since 2.1
+ * @author Benjamin Eberlei <kontakt@beberlei.de>
+ * @author Jonathan Wage <jonwage@gmail.com>
+ */
+interface ObjectManager
+{
+ /**
+ * Finds an object by its identifier.
+ *
+ * This is just a convenient shortcut for getRepository($className)->find($id).
+ *
+ * @param string $className The class name of the object to find.
+ * @param mixed $id The identity of the object to find.
+ *
+ * @return object The found object.
+ */
+ public function find($className, $id);
+
+ /**
+ * Tells the ObjectManager to make an instance managed and persistent.
+ *
+ * The object will be entered into the database as a result of the flush operation.
+ *
+ * NOTE: The persist operation always considers objects that are not yet known to
+ * this ObjectManager as NEW. Do not pass detached objects to the persist operation.
+ *
+ * @param object $object The instance to make managed and persistent.
+ *
+ * @return void
+ */
+ public function persist($object);
+
+ /**
+ * Removes an object instance.
+ *
+ * A removed object will be removed from the database as a result of the flush operation.
+ *
+ * @param object $object The object instance to remove.
+ *
+ * @return void
+ */
+ public function remove($object);
+
+ /**
+ * Merges the state of a detached object into the persistence context
+ * of this ObjectManager and returns the managed copy of the object.
+ * The object passed to merge will not become associated/managed with this ObjectManager.
+ *
+ * @param object $object
+ *
+ * @return object
+ */
+ public function merge($object);
+
+ /**
+ * Clears the ObjectManager. All objects that are currently managed
+ * by this ObjectManager become detached.
+ *
+ * @param string|null $objectName if given, only objects of this type will get detached.
+ *
+ * @return void
+ */
+ public function clear($objectName = null);
+
+ /**
+ * Detaches an object from the ObjectManager, causing a managed object to
+ * become detached. Unflushed changes made to the object if any
+ * (including removal of the object), will not be synchronized to the database.
+ * Objects which previously referenced the detached object will continue to
+ * reference it.
+ *
+ * @param object $object The object to detach.
+ *
+ * @return void
+ */
+ public function detach($object);
+
+ /**
+ * Refreshes the persistent state of an object from the database,
+ * overriding any local changes that have not yet been persisted.
+ *
+ * @param object $object The object to refresh.
+ *
+ * @return void
+ */
+ public function refresh($object);
+
+ /**
+ * Flushes all changes to objects that have been queued up to now to the database.
+ * This effectively synchronizes the in-memory state of managed objects with the
+ * database.
+ *
+ * @return void
+ */
+ public function flush();
+
+ /**
+ * Gets the repository for a class.
+ *
+ * @param string $className
+ *
+ * @return \Doctrine\Common\Persistence\ObjectRepository
+ */
+ public function getRepository($className);
+
+ /**
+ * Returns the ClassMetadata descriptor for a class.
+ *
+ * The class name must be the fully-qualified class name without a leading backslash
+ * (as it is returned by get_class($obj)).
+ *
+ * @param string $className
+ *
+ * @return \Doctrine\Common\Persistence\Mapping\ClassMetadata
+ */
+ public function getClassMetadata($className);
+
+ /**
+ * Gets the metadata factory used to gather the metadata of classes.
+ *
+ * @return \Doctrine\Common\Persistence\Mapping\ClassMetadataFactory
+ */
+ public function getMetadataFactory();
+
+ /**
+ * Helper method to initialize a lazy loading proxy or persistent collection.
+ *
+ * This method is a no-op for other objects.
+ *
+ * @param object $obj
+ *
+ * @return void
+ */
+ public function initializeObject($obj);
+
+ /**
+ * Checks if the object is part of the current UnitOfWork and therefore managed.
+ *
+ * @param object $object
+ *
+ * @return bool
+ */
+ public function contains($object);
+}