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
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
/*
* Copyright (C) 2010 Google Inc. All rights reserved.
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "AsyncFileStream.h"
#include "Blob.h"
#include "FileStream.h"
#include "FileStreamClient.h"
#include "FileThread.h"
#include <wtf/MainThread.h>
#include <wtf/text/WTFString.h>
#if PLATFORM(IOS)
#include "WebCoreThread.h"
#endif
namespace WebCore {
static PassRefPtr<FileThread> createFileThread()
{
RefPtr<FileThread> thread = FileThread::create();
if (!thread->start())
return 0;
return thread.release();
}
static FileThread* fileThread()
{
ASSERT(isMainThread());
static FileThread* thread = createFileThread().leakRef();
return thread;
}
inline AsyncFileStream::AsyncFileStream(FileStreamClient* client)
: m_stream(FileStream::create())
, m_client(client)
{
ASSERT(isMainThread());
}
PassRefPtr<AsyncFileStream> AsyncFileStream::create(FileStreamClient* client)
{
RefPtr<AsyncFileStream> proxy = adoptRef(new AsyncFileStream(client));
// Hold a reference so that the instance will not get deleted while there are tasks on the file thread.
// This is balanced by the deref in derefProxyOnContext below.
proxy->ref();
AsyncFileStream* proxyPtr = proxy.get();
fileThread()->postTask({ proxyPtr, [=] {
// FIXME: It is not correct to check m_client from a secondary thread - stop() could be racing with this check.
if (!proxyPtr->client())
return;
proxyPtr->m_stream->start();
callOnMainThread([proxyPtr] {
if (proxyPtr->client())
proxyPtr->client()->didStart();
});
} });
return proxy.release();
}
AsyncFileStream::~AsyncFileStream()
{
}
void AsyncFileStream::stop()
{
// Clear the client so that we won't be invoking callbacks on the client.
setClient(0);
fileThread()->unscheduleTasks(m_stream.get());
fileThread()->postTask({ this, [this] {
m_stream->stop();
callOnMainThread([this] {
ASSERT(hasOneRef());
deref();
});
} });
}
void AsyncFileStream::getSize(const String& path, double expectedModificationTime)
{
String pathCopy = path.isolatedCopy();
fileThread()->postTask({ this, [this, pathCopy, expectedModificationTime] {
long long size = m_stream->getSize(pathCopy, expectedModificationTime);
callOnMainThread([this, size] {
if (client())
client()->didGetSize(size);
});
} });
}
void AsyncFileStream::openForRead(const String& path, long long offset, long long length)
{
String pathCopy = path.isolatedCopy();
fileThread()->postTask({ this, [this, pathCopy, offset, length] {
bool success = m_stream->openForRead(pathCopy, offset, length);
callOnMainThread([this, success] {
if (client())
client()->didOpen(success);
});
} });
}
void AsyncFileStream::openForWrite(const String& path)
{
String pathCopy = path.isolatedCopy();
fileThread()->postTask({ this, [this, pathCopy] {
bool success = m_stream->openForWrite(pathCopy);
callOnMainThread([this, success] {
if (client())
client()->didOpen(success);
});
} });
}
void AsyncFileStream::close()
{
fileThread()->postTask({this, [this] {
m_stream->close();
} });
}
void AsyncFileStream::read(char* buffer, int length)
{
fileThread()->postTask({ this, [this, buffer, length] {
int bytesRead = m_stream->read(buffer, length);
callOnMainThread([this, bytesRead] {
if (client())
client()->didRead(bytesRead);
});
} });
}
void AsyncFileStream::write(const URL& blobURL, long long position, int length)
{
URL blobURLCopy = blobURL.copy();
fileThread()->postTask({ this, [this, blobURLCopy, position, length] {
int bytesWritten = m_stream->write(blobURLCopy, position, length);
callOnMainThread([this, bytesWritten] {
if (client())
client()->didWrite(bytesWritten);
});
} });
}
void AsyncFileStream::truncate(long long position)
{
fileThread()->postTask({ this, [this, position] {
bool success = m_stream->truncate(position);
callOnMainThread([this, success] {
if (client())
client()->didTruncate(success);
});
} });
}
} // namespace WebCore
|
