vendor/doctrine/cache/lib/Doctrine/Common/Cache/MongoDBCache.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\Cache;

use MongoBinData;
use MongoCollection;
use MongoCursorException;
use MongoDate;

/**
 * MongoDB cache provider.
 *
 * @since  1.1
 * @author Jeremy Mikola <jmikola@gmail.com>
 */
class MongoDBCache extends CacheProvider
{
    /**
     * The data field will store the serialized PHP value.
     */
    const DATA_FIELD = 'd';

    /**
     * The expiration field will store a MongoDate value indicating when the
     * cache entry should expire.
     *
     * With MongoDB 2.2+, entries can be automatically deleted by MongoDB by
     * indexing this field with the "expireAfterSeconds" option equal to zero.
     * This will direct MongoDB to regularly query for and delete any entries
     * whose date is older than the current time. Entries without a date value
     * in this field will be ignored.
     *
     * The cache provider will also check dates on its own, in case expired
     * entries are fetched before MongoDB's TTLMonitor pass can expire them.
     *
     * @see http://docs.mongodb.org/manual/tutorial/expire-data/
     */
    const EXPIRATION_FIELD = 'e';

    /**
     * @var MongoCollection
     */
    private $collection;