com.moparisthebest.jbgjob.RedisScheduler Maven / Gradle / Ivy
/*
* jBgJob (Java Background Job) lets you schedule Java jobs to be ran in the background. They can run in any
* combination of other threads in the same JVM, other JVMs, or multiple other JVMs, even on different machines.
* Copyright (C) 2013 Travis Burtrum (moparisthebest)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.moparisthebest.jbgjob;
import com.fasterxml.jackson.databind.ObjectMapper;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
/**
* This implementation of Scheduler that serializes the DTO into a redis list for processing elsewhere.
*/
public class RedisScheduler extends AbstractScheduler {
public static final boolean debug = "true".equalsIgnoreCase(System.getProperty("redis.debug")); // print debug statements, for development only
public static final String defaultQueuePrefix;
static {
String prefix = System.getProperty("redis.queuePrefix");
if (isEmpty(prefix))
try {
prefix = java.net.InetAddress.getLocalHost().getHostName() + "-";
} catch (Throwable e) {
}
defaultQueuePrefix = defaultIfEmpty(prefix, "");
}
protected final String queuePrefix;
protected final ObjectMapper om = new ObjectMapper().enableDefaultTyping();
protected final JedisPool pool;
public RedisScheduler() {
this(null, null);
}
public RedisScheduler(JedisPool pool) {
this(null, pool);
}
public RedisScheduler(String queuePrefix) {
this(queuePrefix, null);
}
public RedisScheduler(String queuePrefix, JedisPool pool) {
this.queuePrefix = defaultIfEmpty(queuePrefix, defaultQueuePrefix);
this.pool = pool != null ? pool : new JedisPool(new JedisPoolConfig(), System.getProperty("redis.host", "localhost"));
}
@Override
public boolean schedule(final String queue, final ScheduledItem scheduledItem) {
super.schedule(queue, scheduledItem);
Jedis jedis = null;
try {
final String scheduledItemString = om.writeValueAsString(scheduledItem);
if (debug) System.out.printf("redis> LPUSH %s \"%s\"\n", queuePrefix + queue, scheduledItemString);
jedis = pool.getResource();
return jedis.lpush(queuePrefix + queue, scheduledItemString) > 0;
} catch (Throwable e) {
e.printStackTrace();
return false;
} finally {
if (jedis != null)
try {
pool.returnResource(jedis);
} catch (Throwable e) {
e.printStackTrace();
}
}
}
}
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