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 }