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1   /*
2    * Copyright 2012-2013 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  package org.springframework.batch.core.configuration.support;
17  
18  import java.util.Collection;
19  import java.util.HashMap;
20  import java.util.Map;
21  import java.util.concurrent.ConcurrentHashMap;
22  import java.util.concurrent.ConcurrentMap;
23  
24  import org.springframework.batch.core.Step;
25  import org.springframework.batch.core.configuration.DuplicateJobException;
26  import org.springframework.batch.core.configuration.StepRegistry;
27  import org.springframework.batch.core.launch.NoSuchJobException;
28  import org.springframework.batch.core.step.NoSuchStepException;
29  import org.springframework.util.Assert;
30  
31  /**
32   * Simple map-based implementation of {@link StepRegistry}. Access to the map is
33   * synchronized, guarded by an internal lock.
34   *
35   * @author Sebastien Gerard
36   * @author Stephane Nicoll
37   */
38  public class MapStepRegistry implements StepRegistry {
39  
40  	private final ConcurrentMap<String, Map<String, Step>> map = new ConcurrentHashMap<String, Map<String, Step>>();
41  
42  	@Override
43  	public void register(String jobName, Collection<Step> steps) throws DuplicateJobException {
44  		Assert.notNull(jobName, "The job name cannot be null.");
45  		Assert.notNull(steps, "The job steps cannot be null.");
46  
47  
48  		final Map<String, Step> jobSteps = new HashMap<String, Step>();
49  		for (Step step : steps) {
50  			jobSteps.put(step.getName(), step);
51  		}
52  		final Object previousValue = map.putIfAbsent(jobName, jobSteps);
53  		if (previousValue != null) {
54  			throw new DuplicateJobException("A job configuration with this name [" + jobName
55  					+ "] was already registered");
56  		}
57  	}
58  
59  	@Override
60  	public void unregisterStepsFromJob(String jobName) {
61  		Assert.notNull(jobName, "Job configuration must have a name.");
62  		map.remove(jobName);
63  	}
64  
65  	@Override
66  	public Step getStep(String jobName, String stepName) throws NoSuchJobException {
67  		Assert.notNull(jobName, "The job name cannot be null.");
68  		Assert.notNull(stepName, "The step name cannot be null.");
69  		if (!map.containsKey(jobName)) {
70  			throw new NoSuchJobException("No job configuration with the name [" + jobName + "] was registered");
71  		} else {
72  			final Map<String, Step> jobSteps = map.get(jobName);
73  			if (jobSteps.containsKey(stepName)) {
74  				return jobSteps.get(stepName);
75  			} else {
76  				throw new NoSuchStepException("The step called [" + stepName + "] does not exist in the job [" +
77  						jobName + "]");
78  			}
79  		}
80  	}
81  
82  }