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1   /*
2    * Copyright 2012 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  
17  package org.springframework.batch.item.amqp;
18  
19  import org.apache.commons.logging.Log;
20  import org.apache.commons.logging.LogFactory;
21  import org.springframework.amqp.core.AmqpTemplate;
22  import org.springframework.batch.item.ItemWriter;
23  import org.springframework.util.Assert;
24  
25  import java.util.List;
26  
27  /**
28   * <p>
29   * AMQP {@link ItemWriter} implementation using an {@link AmqpTemplate} to
30   * send messages. Messages will be sent to the nameless exchange if not specified
31   * on the provided {@link AmqpTemplate}.
32   * </p>
33   *
34   * @author Chris Schaefer
35   */
36  public class AmqpItemWriter<T> implements ItemWriter<T> {
37      private final AmqpTemplate amqpTemplate;
38      private final Log log = LogFactory.getLog(getClass());
39  
40      public AmqpItemWriter(final AmqpTemplate amqpTemplate) {
41          Assert.notNull(amqpTemplate, "AmpqTemplate must not be null");
42  
43          this.amqpTemplate = amqpTemplate;
44      }
45  
46      @Override
47      public void write(final List<? extends T> items) throws Exception {
48          if (log.isDebugEnabled()) {
49              log.debug("Writing to AMQP with " + items.size() + " items.");
50          }
51  
52          for (T item : items) {
53              amqpTemplate.convertAndSend(item);
54          }
55      }
56  }