/*
* Copyright 2006-2013 the original author or authors.
*
* Licensed 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.springframework.batch.core.configuration.support;
import java.util.Collections;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import org.springframework.batch.core.Job;
import org.springframework.batch.core.configuration.DuplicateJobException;
import org.springframework.batch.core.configuration.JobFactory;
import org.springframework.batch.core.configuration.JobRegistry;
import org.springframework.batch.core.launch.NoSuchJobException;
import org.springframework.util.Assert;
/**
* Simple, thread-safe, map-based implementation of {@link JobRegistry}.
*
* @author Dave Syer
* @author Robert Fischer
*/
public class MapJobRegistry implements JobRegistry {
/**
* The map holding the registered job factories.
*/
// The "final" ensures that it is visible and initialized when the constructor resolves.
private final ConcurrentMap<String, JobFactory> map = new ConcurrentHashMap<String, JobFactory>();
@Override
public void register(JobFactory jobFactory) throws DuplicateJobException {
Assert.notNull(jobFactory);
String name = jobFactory.getJobName();
Assert.notNull(name, "Job configuration must have a name.");
JobFactory previousValue = map.putIfAbsent(name, jobFactory);
if (previousValue != null) {
throw new DuplicateJobException("A job configuration with this name [" + name
+ "] was already registered");
}
}
@Override
public void unregister(String name) {
Assert.notNull(name, "Job configuration must have a name.");
map.remove(name);
}
@Override
public Job getJob(String name) throws NoSuchJobException {
JobFactory factory = map.get(name);
if (factory == null) {
throw new NoSuchJobException("No job configuration with the name [" + name + "] was registered");
} else {
return factory.createJob();
}
}
/**
* Provides an unmodifiable view of the job names.
*/
@Override
public Set<String> getJobNames() {
return Collections.unmodifiableSet(map.keySet());
}
}