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JMSMessageTransformer xref
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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one
3    * or more contributor license agreements.  See the NOTICE file
4    * distributed with this work for additional information
5    * regarding copyright ownership.  The ASF licenses this file
6    * to you under the Apache License, Version 2.0 (the
7    * "License"); you may not use this file except in compliance
8    * with the License.  You may obtain a copy of the License at
9    *
10   *     http://www.apache.org/licenses/LICENSE-2.0
11   *
12   * Unless required by applicable law or agreed to in writing, software
13   * distributed under the License is distributed on an "AS IS" BASIS,
14   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15   * See the License for the specific language governing permissions and
16   * limitations under the License.
17   */
18  package org.apache.hadoop.chukwa.datacollection.adaptor.jms;
19  
20  import javax.jms.Message;
21  import javax.jms.JMSException;
22  
23  /**
24   * Class that knows how to transform a JMS Message to a byte array. The byte
25   * array will become the bytes bound to the Chukwa chunk.
26   */
27  public interface JMSMessageTransformer {
28  
29    /**
30     * Parse any transformer-specific args to initialize the transformer. Return
31     * a null if the arguments could not be parsed. This method will always be
32     * invoked before transform is called only if transformer arguments were
33     * passed. If they weren't, this method will never be called.
34     *
35     * @param args Arguments needed to configur the transformer.
36     * @return input string
37     */
38    public String parseArgs(String args);
39  
40    /**
41     * Transform a Message to an array of bytes. Return null for a message that
42     * should be ignored.
43     *
44     * @param message JMS message received by a JMS Adaptor.
45     * @return the bytes that should be bound to the Chukwa chunk.
46     * @throws JMSException
47     */
48    public byte[] transform(Message message) throws JMSException;
49  }