org.apache.activemq.broker.scheduler.memory.InMemoryJobSchedulerStore Maven / Gradle / Ivy
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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.broker.scheduler.memory;
import java.io.File;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.activemq.broker.scheduler.JobScheduler;
import org.apache.activemq.broker.scheduler.JobSchedulerStore;
import org.apache.activemq.util.ServiceStopper;
import org.apache.activemq.util.ServiceSupport;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An in-memory JobSchedulerStore implementation used for Brokers that have persistence
* disabled or when the JobSchedulerStore usage doesn't require a file or DB based store
* implementation allowing for better performance.
*/
public class InMemoryJobSchedulerStore extends ServiceSupport implements JobSchedulerStore {
private static final Logger LOG = LoggerFactory.getLogger(InMemoryJobSchedulerStore.class);
private final ReentrantLock lock = new ReentrantLock();
private final Map schedulers = new HashMap();
@Override
protected void doStop(ServiceStopper stopper) throws Exception {
for (InMemoryJobScheduler scheduler : schedulers.values()) {
try {
scheduler.stop();
} catch (Exception e) {
LOG.error("Failed to stop scheduler: {}", scheduler.getName(), e);
}
}
}
@Override
protected void doStart() throws Exception {
for (InMemoryJobScheduler scheduler : schedulers.values()) {
try {
scheduler.start();
} catch (Exception e) {
LOG.error("Failed to start scheduler: {}", scheduler.getName(), e);
}
}
}
@Override
public JobScheduler getJobScheduler(String name) throws Exception {
this.lock.lock();
try {
InMemoryJobScheduler result = this.schedulers.get(name);
if (result == null) {
LOG.debug("Creating new in-memory scheduler: {}", name);
result = new InMemoryJobScheduler(name);
this.schedulers.put(name, result);
if (isStarted()) {
result.start();
}
}
return result;
} finally {
this.lock.unlock();
}
}
@Override
public boolean removeJobScheduler(String name) throws Exception {
boolean result = false;
this.lock.lock();
try {
InMemoryJobScheduler scheduler = this.schedulers.remove(name);
result = scheduler != null;
if (result) {
LOG.debug("Removing in-memory Job Scheduler: {}", name);
scheduler.stop();
this.schedulers.remove(name);
}
} finally {
this.lock.unlock();
}
return result;
}
//---------- Methods that don't really apply to this implementation ------//
@Override
public long size() {
return 0;
}
@Override
public File getDirectory() {
return null;
}
@Override
public void setDirectory(File directory) {
}
}