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1   /*
2    * Copyright 2006-2013 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.step.tasklet;
17  
18  import java.util.concurrent.Callable;
19  
20  import org.springframework.batch.core.StepContribution;
21  import org.springframework.batch.core.scope.context.ChunkContext;
22  import org.springframework.batch.repeat.RepeatStatus;
23  import org.springframework.beans.factory.InitializingBean;
24  import org.springframework.util.Assert;
25  
26  /**
27   * Adapts a {@link Callable}<{@link RepeatStatus}> to the {@link Tasklet}
28   * interface.
29   *
30   * @author Dave Syer
31   *
32   */
33  public class CallableTaskletAdapter implements Tasklet, InitializingBean {
34  
35  	private Callable<RepeatStatus> callable;
36  
37  	/**
38  	 * Public setter for the {@link Callable}.
39  	 * @param callable the {@link Callable} to set
40  	 */
41  	public void setCallable(Callable<RepeatStatus> callable) {
42  		this.callable = callable;
43  	}
44  
45  	/**
46  	 * Assert that the callable is set.
47  	 *
48  	 * @see org.springframework.beans.factory.InitializingBean#afterPropertiesSet()
49  	 */
50  	@Override
51  	public void afterPropertiesSet() throws Exception {
52  		Assert.notNull(callable);
53  	}
54  
55  	/**
56  	 * Execute the provided Callable and return its {@link RepeatStatus}. Ignores
57  	 * the {@link StepContribution} and the attributes.
58  	 * @see Tasklet#execute(StepContribution, ChunkContext)
59  	 */
60  	@Override
61  	public RepeatStatus execute(StepContribution contribution, ChunkContext chunkContext) throws Exception {
62  		return callable.call();
63  	}
64  
65  }