vendor/doctrine/common/lib/Doctrine/Common/EventManager.php

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<?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;

/**
 * The EventManager is the central point of Doctrine's event listener system.
 * Listeners are registered on the manager and events are dispatched through the
 * manager.
 *
 * @link   www.doctrine-project.org
 * @since  2.0
 * @author Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author Jonathan Wage <jonwage@gmail.com>
 * @author Roman Borschel <roman@code-factory.org>
 */
class EventManager
{
    /**
     * Map of registered listeners.
     * <event> => <listeners>
     *
     * @var array
     */
    private $_listeners = array();

    /**
     * Dispatches an event to all registered listeners.
     *
     * @param string    $eventName      The name of the event to dispatch. The name of the event is
     *                                  the name of the method that is invoked on listeners.
     * @param EventArgs|null $eventArgs The event arguments to pass to the event handlers/listeners.
     *                                  If not supplied, the single empty EventArgs instance is used.
     *
     * @return boolean
     */
    public function dispatchEvent($eventName, EventArgs $eventArgs = null)
    {
        if (isset($this->_listeners[$eventName])) {
            $eventArgs = $eventArgs === null ? EventArgs::getEmptyInstance() : $eventArgs;

            foreach ($this->_listeners[$eventName] as $listener) {
                $listener->$eventName($eventArgs);
            }