001/*
002 * (C) Copyright 2006-2014 Nuxeo SA (http://nuxeo.com/) and others.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *     http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016package org.nuxeo.ecm.core.redis;
017
018import org.nuxeo.ecm.core.redis.retry.ExponentialBackofDelay;
019import org.nuxeo.ecm.core.redis.retry.Retry;
020import org.nuxeo.ecm.core.redis.retry.Retry.ContinueException;
021import org.nuxeo.ecm.core.redis.retry.Retry.FailException;
022
023import redis.clients.jedis.Jedis;
024import redis.clients.jedis.exceptions.JedisConnectionException;
025import redis.clients.util.Pool;
026
027public class RedisFailoverExecutor implements RedisExecutor {
028
029    protected final int timeout;
030
031    protected final RedisExecutor executor;
032
033    public RedisFailoverExecutor(int timeout, RedisExecutor base) {
034        this.timeout = timeout;
035        executor = base;
036    }
037
038    @Override
039    public <T> T execute(final RedisCallable<T> callable) throws JedisConnectionException {
040        try {
041            return new Retry().retry(new Retry.Block<T>() {
042
043                @Override
044                public T retry() throws ContinueException, FailException {
045                    try {
046                        return executor.execute(callable);
047                    } catch (JedisConnectionException cause) {
048                        throw new Retry.ContinueException(cause);
049                    }
050                }
051
052            }, new ExponentialBackofDelay(1, timeout));
053        } catch (FailException cause) {
054            throw new JedisConnectionException("Cannot reconnect to jedis ..", cause);
055        }
056    }
057
058    @Override
059    public Pool<Jedis> getPool() {
060        return executor.getPool();
061    }
062
063    @Override
064    public boolean supportPipelined() {
065        return executor.supportPipelined();
066    }
067
068}