001/*
002 * (C) Copyright 2014-2015 Nuxeo SA (http://nuxeo.com/) and contributors.
003 *
004 * All rights reserved. This program and the accompanying materials
005 * are made available under the terms of the GNU Lesser General Public License
006 * (LGPL) version 2.1 which accompanies this distribution, and is available at
007 * http://www.gnu.org/licenses/lgpl-2.1.html
008 *
009 * This library is distributed in the hope that it will be useful,
010 * but WITHOUT ANY WARRANTY; without even the implied warranty of
011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
012 * Lesser General Public License for more details.
013 *
014 * Contributors:
015 *     Thierry Delprat
016 *     Florent Guillaume
017 */
018package org.nuxeo.ecm.core.redis.contribs;
019
020import java.io.IOException;
021
022import org.apache.commons.logging.Log;
023import org.apache.commons.logging.LogFactory;
024import org.nuxeo.ecm.core.api.NuxeoException;
025import org.nuxeo.ecm.core.redis.RedisAdmin;
026import org.nuxeo.ecm.core.redis.RedisCallable;
027import org.nuxeo.ecm.core.redis.RedisExecutor;
028import org.nuxeo.ecm.core.uidgen.AbstractUIDSequencer;
029import org.nuxeo.runtime.api.Framework;
030
031import redis.clients.jedis.Jedis;
032import redis.clients.jedis.exceptions.JedisException;
033
034/**
035 * Redis-based UID generator.
036 *
037 * @since 7.4
038 */
039public class RedisUIDSequencer extends AbstractUIDSequencer {
040
041    protected static final Log log = LogFactory.getLog(RedisUIDSequencer.class);
042
043    protected String namespace;
044
045    @Override
046    public void init() {
047        RedisAdmin redisAdmin = Framework.getService(RedisAdmin.class);
048        namespace = redisAdmin.namespace("counters");
049    }
050
051    @Override
052    public void dispose() {
053    }
054
055    @Override
056    public int getNext(String key) {
057        RedisExecutor executor = Framework.getService(RedisExecutor.class);
058        try {
059            return executor.execute(new RedisCallable<Long>() {
060                @Override
061                public Long call(Jedis jedis) {
062                    return jedis.incr(namespace + key);
063                }
064            }).intValue();
065        } catch (JedisException e) {
066            throw new NuxeoException(e);
067        }
068    }
069
070}