1 /*
2 *
3 * Licensed to the Apache Software Foundation (ASF) under one
4 * or more contributor license agreements. See the NOTICE file
5 * distributed with this work for additional information
6 * regarding copyright ownership. The ASF licenses this file
7 * to you under the Apache License, Version 2.0 (the
8 * "License"); you may not use this file except in compliance
9 * with the License. You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19 package org.apache.hadoop.hbase.io;
20
21 import java.io.IOException;
22 import java.io.OutputStream;
23
24 import org.apache.hadoop.classification.InterfaceAudience;
25
26 /**
27 * An output stream that writes to two streams on each operation. Does not
28 * attempt to handle exceptions gracefully. If any operation other than
29 * {@link #close()} fails on the first stream, it is not called on the second
30 * stream.
31 */
32 @InterfaceAudience.Private
33 public class DoubleOutputStream extends OutputStream {
34 private OutputStream out1;
35 private OutputStream out2;
36
37 public DoubleOutputStream(OutputStream out1, OutputStream out2) {
38 this.out1 = out1;
39 this.out2 = out2;
40 }
41
42 @Override
43 public void write(int b) throws IOException {
44 out1.write(b);
45 out2.write(b);
46 }
47
48 @Override
49 public void write(byte b[]) throws IOException {
50 out1.write(b, 0, b.length);
51 out2.write(b, 0, b.length);
52 }
53
54 @Override
55 public void write(byte b[], int off, int len) throws IOException {
56 out1.write(b, off, len);
57 out2.write(b, off, len);
58 }
59
60 @Override
61 public void flush() throws IOException {
62 out1.flush();
63 out2.flush();
64 }
65
66 @Override
67 public void close() throws IOException {
68 try {
69 out1.close();
70 } finally {
71 // Make sure we at least attempt to close both streams.
72 out2.close();
73 }
74 }
75
76 }