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1 // Copyright (c) 2010 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 #ifndef NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_ | |
6 #define NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_ | |
7 | |
8 #include <string> | |
9 | |
10 #include "base/message_loop_proxy.h" | |
11 #include "net/base/completion_callback.h" | |
12 #include "net/base/io_buffer.h" | |
13 #include "net/disk_cache/entry_impl.h" | |
14 #include "net/disk_cache/in_flight_io.h" | |
15 | |
16 namespace disk_cache { | |
17 | |
18 class BackendImpl; | |
19 | |
20 // This class represents a single asynchronous disk cache IO operation while it | |
21 // is being bounced between threads. | |
22 class BackendIO : public BackgroundIO { | |
23 public: | |
24 BackendIO(InFlightIO* controller, BackendImpl* backend, | |
25 net::CompletionCallback* callback); | |
26 | |
27 // Runs the actual operation on the background thread. | |
28 void ExecuteOperation(); | |
29 | |
30 // Callback implementation. | |
31 void OnIOComplete(int result); | |
32 | |
33 // Returns true if this operation is directed to an entry (vs. the backend). | |
34 bool IsEntryOperation(); | |
35 | |
36 net::CompletionCallback* callback() { return callback_; } | |
37 | |
38 void ReleaseEntry(); | |
39 | |
40 // The operations we proxy: | |
41 void Init(); | |
42 void OpenEntry(const std::string& key, Entry** entry); | |
43 void CreateEntry(const std::string& key, Entry** entry); | |
44 void DoomEntry(const std::string& key); | |
45 void DoomAllEntries(); | |
46 void DoomEntriesBetween(const base::Time initial_time, | |
47 const base::Time end_time); | |
48 void DoomEntriesSince(const base::Time initial_time); | |
49 void OpenNextEntry(void** iter, Entry** next_entry); | |
50 void OpenPrevEntry(void** iter, Entry** prev_entry); | |
51 void EndEnumeration(void* iterator); | |
52 void CloseEntryImpl(EntryImpl* entry); | |
53 void DoomEntryImpl(EntryImpl* entry); | |
54 void FlushQueue(); // Dummy operation. | |
55 void ReadData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf, | |
56 int buf_len); | |
57 void WriteData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf, | |
58 int buf_len, bool truncate); | |
59 void ReadSparseData(EntryImpl* entry, int64 offset, net::IOBuffer* buf, | |
60 int buf_len); | |
61 void WriteSparseData(EntryImpl* entry, int64 offset, net::IOBuffer* buf, | |
62 int buf_len); | |
63 void GetAvailableRange(EntryImpl* entry, int64 offset, int len, int64* start); | |
64 void CancelSparseIO(EntryImpl* entry); | |
65 void ReadyForSparseIO(EntryImpl* entry); | |
66 | |
67 private: | |
68 // There are two types of operations to proxy: regular backend operations are | |
69 // queued so that we don't have more than one operation going on at the same | |
70 // time (for instance opening an entry and creating the same entry). On the | |
71 // other hand, operations targeted to a given entry can be long lived and | |
72 // support multiple simultaneous users (multiple reads or writes to the same | |
73 // entry), so they are not queued, just posted to the worker thread as they | |
74 // come. | |
75 enum Operation { | |
76 OP_NONE = 0, | |
77 OP_INIT, | |
78 OP_OPEN, | |
79 OP_CREATE, | |
80 OP_DOOM, | |
81 OP_DOOM_ALL, | |
82 OP_DOOM_BETWEEN, | |
83 OP_DOOM_SINCE, | |
84 OP_OPEN_NEXT, | |
85 OP_OPEN_PREV, | |
86 OP_END_ENUMERATION, | |
87 OP_CLOSE_ENTRY, | |
88 OP_DOOM_ENTRY, | |
89 OP_FLUSH_QUEUE, | |
90 OP_MAX_BACKEND, | |
91 OP_READ, | |
92 OP_WRITE, | |
93 OP_READ_SPARSE, | |
94 OP_WRITE_SPARSE, | |
95 OP_GET_RANGE, | |
96 OP_CANCEL_IO, | |
97 OP_IS_READY | |
98 }; | |
99 | |
100 ~BackendIO() {} | |
101 | |
102 void ExecuteBackendOperation(); | |
103 void ExecuteEntryOperation(); | |
104 | |
105 BackendImpl* backend_; | |
106 net::CompletionCallback* callback_; | |
107 Operation operation_; | |
108 net::CompletionCallbackImpl<BackendIO> my_callback_; | |
109 | |
110 // The arguments of all the operations we proxy: | |
111 std::string key_; | |
112 Entry** entry_ptr_; | |
113 base::Time initial_time_; | |
114 base::Time end_time_; | |
115 void** iter_ptr_; | |
116 void* iter_; | |
117 EntryImpl* entry_; | |
118 int index_; | |
119 int offset_; | |
120 scoped_refptr<net::IOBuffer> buf_; | |
121 int buf_len_; | |
122 bool truncate_; | |
123 int64 offset64_; | |
124 int64* start_; | |
125 | |
126 DISALLOW_COPY_AND_ASSIGN(BackendIO); | |
127 }; | |
128 | |
129 // The specialized controller that keeps track of current operations. | |
130 class InFlightBackendIO : public InFlightIO { | |
131 public: | |
132 InFlightBackendIO(BackendImpl* backend, | |
133 base::MessageLoopProxy* background_thread) | |
134 : backend_(backend), background_thread_(background_thread) {} | |
135 ~InFlightBackendIO() {} | |
136 | |
137 // The operations we proxy: | |
138 void Init(net::CompletionCallback* callback); | |
139 void OpenEntry(const std::string& key, Entry** entry, | |
140 net::CompletionCallback* callback); | |
141 void CreateEntry(const std::string& key, Entry** entry, | |
142 net::CompletionCallback* callback); | |
143 void DoomEntry(const std::string& key, net::CompletionCallback* callback); | |
144 void DoomAllEntries(net::CompletionCallback* callback); | |
145 void DoomEntriesBetween(const base::Time initial_time, | |
146 const base::Time end_time, | |
147 net::CompletionCallback* callback); | |
148 void DoomEntriesSince(const base::Time initial_time, | |
149 net::CompletionCallback* callback); | |
150 void OpenNextEntry(void** iter, Entry** next_entry, | |
151 net::CompletionCallback* callback); | |
152 void OpenPrevEntry(void** iter, Entry** prev_entry, | |
153 net::CompletionCallback* callback); | |
154 void EndEnumeration(void* iterator); | |
155 void CloseEntryImpl(EntryImpl* entry); | |
156 void DoomEntryImpl(EntryImpl* entry); | |
157 void FlushQueue(net::CompletionCallback* callback); | |
158 void ReadData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf, | |
159 int buf_len, net::CompletionCallback* callback); | |
160 void WriteData(EntryImpl* entry, int index, int offset, net::IOBuffer* buf, | |
161 int buf_len, bool truncate, net::CompletionCallback* callback); | |
162 void ReadSparseData(EntryImpl* entry, int64 offset, net::IOBuffer* buf, | |
163 int buf_len, net::CompletionCallback* callback); | |
164 void WriteSparseData(EntryImpl* entry, int64 offset, net::IOBuffer* buf, | |
165 int buf_len, net::CompletionCallback* callback); | |
166 void GetAvailableRange(EntryImpl* entry, int64 offset, int len, int64* start, | |
167 net::CompletionCallback* callback); | |
168 void CancelSparseIO(EntryImpl* entry); | |
169 void ReadyForSparseIO(EntryImpl* entry, net::CompletionCallback* callback); | |
170 | |
171 // Blocks until all operations are cancelled or completed. | |
172 void WaitForPendingIO(); | |
173 | |
174 scoped_refptr<base::MessageLoopProxy> background_thread() { | |
175 return background_thread_; | |
176 } | |
177 | |
178 // Returns true if the current thread is the background thread. | |
179 bool BackgroundIsCurrentThread() { | |
180 return background_thread_->BelongsToCurrentThread(); | |
181 } | |
182 | |
183 protected: | |
184 virtual void OnOperationComplete(BackgroundIO* operation, bool cancel); | |
185 | |
186 private: | |
187 typedef std::list<scoped_refptr<BackendIO> > OperationList; | |
188 void QueueOperation(BackendIO* operation); | |
189 void PostOperation(BackendIO* operation); | |
190 | |
191 BackendImpl* backend_; | |
192 scoped_refptr<base::MessageLoopProxy> background_thread_; | |
193 OperationList pending_ops_; // The list of operations to be posted. | |
194 | |
195 DISALLOW_COPY_AND_ASSIGN(InFlightBackendIO); | |
196 }; | |
197 | |
198 } // namespace disk_cache | |
199 | |
200 #endif // NET_DISK_CACHE_IN_FLIGHT_BACKEND_IO_H_ | |
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