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1 // Copyright 2015 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 package org.chromium.net.urlconnection; | |
6 | |
7 import org.chromium.base.VisibleForTesting; | |
8 import org.chromium.net.UploadDataProvider; | |
9 import org.chromium.net.UploadDataSink; | |
10 | |
11 import java.io.IOException; | |
12 import java.io.OutputStream; | |
13 import java.nio.ByteBuffer; | |
14 | |
15 /** | |
16 * An implementation of {@link java.io.OutputStream} to send data to a server, | |
17 * when {@link CronetHttpURLConnection#setFixedLengthStreamingMode} is used. | |
18 * This implementation does not buffer the entire request body in memory. | |
19 * Note that {@link #write} should only be called from the thread on which the | |
20 * {@link #mConnection} is created. | |
21 */ | |
22 final class CronetOutputStream extends OutputStream implements UploadDataProvide r { | |
23 // CronetOutputStream buffers up to this value and wait for UploadDataStream | |
24 // to consume the data. This field is non-final, so it can be changed for te sts. | |
25 // TODO(xunjieli): figure out whether this default value should be changed. | |
26 @VisibleForTesting | |
mmenke
2015/03/13 14:51:12
What does this do? I don't see any of our tests u
xunjieli
2015/03/13 19:26:40
The docs on this flag says "Annotation used to mar
| |
27 private static int sDefaultBufferLength = 2048; | |
mmenke
2015/03/13 14:51:12
This should probably be 32k
xunjieli
2015/03/13 19:26:40
But 32k is larger than all the read buffers used i
mmenke
2015/03/25 18:34:57
You're right. We generally read from URLRequests
| |
28 private final CronetHttpURLConnection mConnection; | |
29 private final long mContentLength; | |
30 private final ByteBuffer mBuffer; | |
31 private long mBytesReceived; | |
32 | |
33 /** | |
34 * Packaged protected constructor. | |
35 * @param connection The CronetHttpURLConnection object. | |
36 * @param contentLength The content length of the request body. Non-zero for | |
37 * non-chunked upload. | |
38 */ | |
39 CronetOutputStream(CronetHttpURLConnection connection, long contentLength) { | |
40 if (connection == null) { | |
41 throw new NullPointerException(); | |
42 } | |
43 if (contentLength < 0) { | |
44 throw new IllegalArgumentException( | |
45 "Content length must be larger than 0 for non-chunked upload ."); | |
46 } | |
47 mContentLength = contentLength; | |
48 int bufferSize = (int) Math.min(mContentLength, sDefaultBufferLength); | |
49 mBuffer = ByteBuffer.allocate(bufferSize); | |
50 mConnection = connection; | |
51 mBytesReceived = 0; | |
52 } | |
53 | |
54 @Override | |
55 public void write(int oneByte) throws IOException { | |
56 while (mBuffer.position() == mBuffer.limit()) { | |
57 // Wait until buffer is consumed. | |
58 mConnection.waitForRead(); | |
59 } | |
60 mBuffer.put((byte) oneByte); | |
61 mBytesReceived++; | |
62 if (mBytesReceived == mContentLength) { | |
63 // Entire post data has been received. Now wait for network stack to | |
64 // read it. | |
65 mConnection.waitForRead(); | |
66 } | |
67 } | |
68 | |
69 @Override | |
70 public void write(byte[] buffer, int offset, int count) throws IOException { | |
71 if (buffer.length - offset < count || offset < 0 || count < 0) { | |
72 throw new IndexOutOfBoundsException(); | |
73 } | |
74 if (count == 0) { | |
75 return; | |
76 } | |
77 int toSend = count; | |
78 while (toSend > 0) { | |
79 if (mBuffer.position() == mBuffer.limit()) { | |
80 // Wait until buffer is consumed. | |
81 mConnection.waitForRead(); | |
82 } | |
83 int sent = Math.min(toSend, mBuffer.limit() - mBuffer.position()); | |
84 mBuffer.put(buffer, offset + count - toSend, sent); | |
85 toSend -= sent; | |
86 } | |
87 mBytesReceived += count; | |
88 if (mBytesReceived == mContentLength) { | |
89 // Entire post data has been received. Now wait for network stack to | |
90 // read it. | |
91 mConnection.waitForRead(); | |
92 } | |
93 } | |
94 | |
95 // Below are UploadDataProvider implementations. Only intended to be used | |
96 // within Cronet. | |
97 | |
98 @Override | |
99 public long getLength() { | |
100 return mContentLength; | |
101 } | |
102 | |
103 @Override | |
104 public void read(final UploadDataSink uploadDataSink, final ByteBuffer byteB uffer) { | |
105 Runnable readTask = new Runnable() { | |
106 @Override | |
107 public void run() { | |
108 if (byteBuffer.remaining() < mBuffer.position()) { | |
109 // byteBuffer does not have enough capacity, so only put a p ortion | |
110 // of mBuffer in it. | |
111 mBuffer.position(byteBuffer.remaining()); | |
112 byteBuffer.put(mBuffer.array(), 0, byteBuffer.remaining()); | |
113 // Move remaining buffer to the head of the buffer for use i n the | |
114 // next read call. | |
115 mBuffer.compact(); | |
116 uploadDataSink.onReadSucceeded(false); | |
117 } else { | |
118 // byteBuffer has enough capacity to hold content in mBuffer . | |
119 mBuffer.flip(); | |
120 byteBuffer.put(mBuffer); | |
121 // Reuse this buffer. | |
122 mBuffer.clear(); | |
123 uploadDataSink.onReadSucceeded(false); | |
124 } | |
125 } | |
126 }; | |
127 if (mBuffer.position() == 0) { | |
128 // Exit the message loop, so consumer can write more data. | |
129 if (mBytesReceived < mContentLength) { | |
130 mConnection.postponeRead(readTask); | |
131 } | |
132 } else { | |
133 readTask.run(); | |
134 } | |
135 } | |
136 | |
137 @Override | |
138 public void rewind(UploadDataSink uploadDataSink) { | |
139 uploadDataSink.onRewindError(null); | |
140 } | |
141 | |
142 /** | |
143 * Sets the default buffer length for use in tests. | |
144 */ | |
145 @VisibleForTesting | |
146 static void setDefaultBufferLengthForTesting(int length) { | |
147 sDefaultBufferLength = length; | |
148 } | |
149 } | |
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