View Javadoc

1   /*
2    * Copyright 2011 The Apache Software Foundation
3    *
4    * Licensed to the Apache Software Foundation (ASF) under one
5    * or more contributor license agreements.  See the NOTICE file
6    * distributed with this work for additional information
7    * regarding copyright ownership.  The ASF licenses this file
8    * to you under the Apache License, Version 2.0 (the
9    * "License"); you may not use this file except in compliance
10   * with the License.  You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  package org.apache.hadoop.hbase.io;
21  
22  import java.io.IOException;
23  import java.io.OutputStream;
24  
25  /**
26   * An output stream that writes to two streams on each operation. Does not
27   * attempt to handle exceptions gracefully. If any operation other than
28   * {@link #close()} fails on the first stream, it is not called on the second
29   * stream.
30   */
31  public class DoubleOutputStream extends OutputStream {
32    private OutputStream out1;
33    private OutputStream out2;
34  
35    public DoubleOutputStream(OutputStream out1, OutputStream out2) {
36      this.out1 = out1;
37      this.out2 = out2;
38    }
39  
40    @Override
41    public void write(int b) throws IOException {
42      out1.write(b);
43      out2.write(b);
44    }
45  
46    @Override
47    public void write(byte b[]) throws IOException {
48      out1.write(b, 0, b.length);
49      out2.write(b, 0, b.length);
50    }
51  
52    @Override
53    public void write(byte b[], int off, int len) throws IOException {
54      out1.write(b, off, len);
55      out2.write(b, off, len);
56    }
57  
58    @Override
59    public void flush() throws IOException {
60      out1.flush();
61      out2.flush();
62    }
63  
64    @Override
65    public void close() throws IOException {
66      try {
67        out1.close();
68      } finally {
69        // Make sure we at least attempt to close both streams.
70        out2.close();
71      }
72    }
73  
74  }