blob: f88285dfb587dabe6e06d8188b2d32c3d15a6b9a (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
// Copyright 2014 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package com.google.devtools.build.lib.vfs.inmemoryfs;
import com.google.common.base.Preconditions;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadSafe;
import com.google.devtools.build.lib.util.Clock;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* InMemoryFileInfo manages file contents by storing them entirely in memory.
*/
@ThreadSafe
public class InMemoryFileInfo extends FileInfo {
/**
* Updates to the content must atomically update the lastModifiedTime. So all
* accesses to this field must be synchronized.
*/
protected byte[] content;
protected InMemoryFileInfo(Clock clock) {
super(clock);
content = new byte[0]; // New files start out empty.
}
@Override
public synchronized long getSize() {
return content.length;
}
@Override
public synchronized byte[] readContent() {
return content.clone();
}
private synchronized void setContent(byte[] newContent) {
content = newContent;
markModificationTime();
}
@Override
protected synchronized OutputStream getOutputStream(boolean append)
throws IOException {
OutputStream out = new ByteArrayOutputStream() {
private boolean closed = false;
@Override
public void write(byte[] data) throws IOException {
Preconditions.checkState(!closed);
super.write(data);
}
@Override
public void write(int dataByte) {
Preconditions.checkState(!closed);
super.write(dataByte);
}
@Override
public void write(byte[] data, int offset, int length) {
Preconditions.checkState(!closed);
super.write(data, offset, length);
}
@Override
public void close() {
flush();
closed = true;
}
@Override
public void flush() {
setContent(toByteArray().clone());
}
};
if (append) {
out.write(readContent());
}
return out;
}
}
|
