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1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "content/common_child/indexed_db/proxy_webidbcursor_impl.h" | 5 #include "content/common_child/indexed_db/proxy_webidbcursor_impl.h" |
6 | 6 |
7 #include <vector> | 7 #include <vector> |
8 | 8 |
9 #include "content/common/child_thread.h" | 9 #include "content/common/child_thread.h" |
10 #include "content/common/indexed_db/indexed_db_messages.h" | 10 #include "content/common/indexed_db/indexed_db_messages.h" |
11 #include "content/common_child/indexed_db/indexed_db_dispatcher.h" | 11 #include "content/common_child/indexed_db/indexed_db_dispatcher.h" |
12 | 12 |
13 using WebKit::WebData; | 13 using WebKit::WebData; |
14 using WebKit::WebIDBCallbacks; | 14 using WebKit::WebIDBCallbacks; |
15 using WebKit::WebIDBKey; | 15 using WebKit::WebIDBKey; |
16 | 16 |
17 namespace content { | 17 namespace content { |
18 | 18 |
19 RendererWebIDBCursorImpl::RendererWebIDBCursorImpl(int32 ipc_cursor_id) | 19 RendererWebIDBCursorImpl::RendererWebIDBCursorImpl(int32 ipc_cursor_id) |
20 : ipc_cursor_id_(ipc_cursor_id), | 20 : ipc_cursor_id_(ipc_cursor_id), |
21 continue_count_(0), | 21 continue_count_(0), |
22 used_prefetches_(0), | 22 used_prefetches_(0), |
23 pending_onsuccess_callbacks_(0), | 23 pending_onsuccess_callbacks_(0), |
24 prefetch_amount_(kMinPrefetchAmount) { | 24 prefetch_amount_(kMinPrefetchAmount) {} |
25 } | |
26 | 25 |
27 RendererWebIDBCursorImpl::~RendererWebIDBCursorImpl() { | 26 RendererWebIDBCursorImpl::~RendererWebIDBCursorImpl() { |
28 // It's not possible for there to be pending callbacks that address this | 27 // It's not possible for there to be pending callbacks that address this |
29 // object since inside WebKit, they hold a reference to the object which owns | 28 // object since inside WebKit, they hold a reference to the object which owns |
30 // this object. But, if that ever changed, then we'd need to invalidate | 29 // this object. But, if that ever changed, then we'd need to invalidate |
31 // any such pointers. | 30 // any such pointers. |
32 | 31 |
33 if (ipc_cursor_id_ != kInvalidCursorId) { | 32 if (ipc_cursor_id_ != kInvalidCursorId) { |
34 // Invalid ID used in tests to avoid really sending this message. | 33 // Invalid ID used in tests to avoid really sending this message. |
35 IndexedDBDispatcher::Send(new IndexedDBHostMsg_CursorDestroyed( | 34 IndexedDBDispatcher::Send( |
36 ipc_cursor_id_)); | 35 new IndexedDBHostMsg_CursorDestroyed(ipc_cursor_id_)); |
37 } | 36 } |
38 IndexedDBDispatcher* dispatcher = | 37 IndexedDBDispatcher* dispatcher = |
39 IndexedDBDispatcher::ThreadSpecificInstance(); | 38 IndexedDBDispatcher::ThreadSpecificInstance(); |
40 dispatcher->CursorDestroyed(ipc_cursor_id_); | 39 dispatcher->CursorDestroyed(ipc_cursor_id_); |
41 } | 40 } |
42 | 41 |
43 void RendererWebIDBCursorImpl::advance(unsigned long count, | 42 void RendererWebIDBCursorImpl::advance(unsigned long count, |
44 WebIDBCallbacks* callbacks_ptr) { | 43 WebIDBCallbacks* callbacks_ptr) { |
45 IndexedDBDispatcher* dispatcher = | 44 IndexedDBDispatcher* dispatcher = |
46 IndexedDBDispatcher::ThreadSpecificInstance(); | 45 IndexedDBDispatcher::ThreadSpecificInstance(); |
47 scoped_ptr<WebIDBCallbacks> callbacks(callbacks_ptr); | 46 scoped_ptr<WebIDBCallbacks> callbacks(callbacks_ptr); |
48 ResetPrefetchCache(); | 47 ResetPrefetchCache(); |
49 dispatcher->RequestIDBCursorAdvance(count, callbacks.release(), | 48 dispatcher->RequestIDBCursorAdvance( |
50 ipc_cursor_id_); | 49 count, callbacks.release(), ipc_cursor_id_); |
51 } | 50 } |
52 | 51 |
53 void RendererWebIDBCursorImpl::continueFunction( | 52 void RendererWebIDBCursorImpl::continueFunction( |
54 const WebIDBKey& key, | 53 const WebIDBKey& key, |
55 WebIDBCallbacks* callbacks_ptr) { | 54 WebIDBCallbacks* callbacks_ptr) { |
56 IndexedDBDispatcher* dispatcher = | 55 IndexedDBDispatcher* dispatcher = |
57 IndexedDBDispatcher::ThreadSpecificInstance(); | 56 IndexedDBDispatcher::ThreadSpecificInstance(); |
58 scoped_ptr<WebIDBCallbacks> callbacks(callbacks_ptr); | 57 scoped_ptr<WebIDBCallbacks> callbacks(callbacks_ptr); |
59 | 58 |
60 if (key.type() == WebIDBKey::NullType) { | 59 if (key.type() == WebIDBKey::NullType) { |
61 // No key, so this would qualify for a prefetch. | 60 // No key, so this would qualify for a prefetch. |
62 ++continue_count_; | 61 ++continue_count_; |
63 | 62 |
64 if (!prefetch_keys_.empty()) { | 63 if (!prefetch_keys_.empty()) { |
65 // We have a prefetch cache, so serve the result from that. | 64 // We have a prefetch cache, so serve the result from that. |
66 CachedContinue(callbacks.get()); | 65 CachedContinue(callbacks.get()); |
67 return; | 66 return; |
68 } | 67 } |
69 | 68 |
70 if (continue_count_ > kPrefetchContinueThreshold) { | 69 if (continue_count_ > kPrefetchContinueThreshold) { |
71 // Request pre-fetch. | 70 // Request pre-fetch. |
72 ++pending_onsuccess_callbacks_; | 71 ++pending_onsuccess_callbacks_; |
73 dispatcher->RequestIDBCursorPrefetch(prefetch_amount_, | 72 dispatcher->RequestIDBCursorPrefetch( |
74 callbacks.release(), | 73 prefetch_amount_, callbacks.release(), ipc_cursor_id_); |
75 ipc_cursor_id_); | |
76 | 74 |
77 // Increase prefetch_amount_ exponentially. | 75 // Increase prefetch_amount_ exponentially. |
78 prefetch_amount_ *= 2; | 76 prefetch_amount_ *= 2; |
79 if (prefetch_amount_ > kMaxPrefetchAmount) | 77 if (prefetch_amount_ > kMaxPrefetchAmount) |
80 prefetch_amount_ = kMaxPrefetchAmount; | 78 prefetch_amount_ = kMaxPrefetchAmount; |
81 | 79 |
82 return; | 80 return; |
83 } | 81 } |
84 } else { | 82 } else { |
85 // Key argument supplied. We couldn't prefetch this. | 83 // Key argument supplied. We couldn't prefetch this. |
86 ResetPrefetchCache(); | 84 ResetPrefetchCache(); |
87 } | 85 } |
88 | 86 |
89 dispatcher->RequestIDBCursorContinue(IndexedDBKey(key), | 87 dispatcher->RequestIDBCursorContinue( |
90 callbacks.release(), | 88 IndexedDBKey(key), callbacks.release(), ipc_cursor_id_); |
91 ipc_cursor_id_); | |
92 } | |
93 | |
94 void RendererWebIDBCursorImpl::deleteFunction(WebIDBCallbacks* callbacks) { | |
95 IndexedDBDispatcher* dispatcher = | |
96 IndexedDBDispatcher::ThreadSpecificInstance(); | |
97 dispatcher->RequestIDBCursorDelete(callbacks, ipc_cursor_id_); | |
98 } | 89 } |
99 | 90 |
100 void RendererWebIDBCursorImpl::postSuccessHandlerCallback() { | 91 void RendererWebIDBCursorImpl::postSuccessHandlerCallback() { |
101 pending_onsuccess_callbacks_--; | 92 pending_onsuccess_callbacks_--; |
102 | 93 |
103 // If the onsuccess callback called continue() on the cursor again, | 94 // If the onsuccess callback called continue() on the cursor again, |
104 // and that continue was served by the prefetch cache, then | 95 // and that continue was served by the prefetch cache, then |
105 // pending_onsuccess_callbacks_ would be incremented. | 96 // pending_onsuccess_callbacks_ would be incremented. |
106 // If not, it means the callback did something else, or nothing at all, | 97 // If not, it means the callback did something else, or nothing at all, |
107 // in which case we need to reset the cache. | 98 // in which case we need to reset the cache. |
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147 continue_count_ = 0; | 138 continue_count_ = 0; |
148 prefetch_amount_ = kMinPrefetchAmount; | 139 prefetch_amount_ = kMinPrefetchAmount; |
149 | 140 |
150 if (!prefetch_keys_.size()) { | 141 if (!prefetch_keys_.size()) { |
151 // No prefetch cache, so no need to reset the cursor in the back-end. | 142 // No prefetch cache, so no need to reset the cursor in the back-end. |
152 return; | 143 return; |
153 } | 144 } |
154 | 145 |
155 IndexedDBDispatcher* dispatcher = | 146 IndexedDBDispatcher* dispatcher = |
156 IndexedDBDispatcher::ThreadSpecificInstance(); | 147 IndexedDBDispatcher::ThreadSpecificInstance(); |
157 dispatcher->RequestIDBCursorPrefetchReset(used_prefetches_, | 148 dispatcher->RequestIDBCursorPrefetchReset( |
158 prefetch_keys_.size(), | 149 used_prefetches_, prefetch_keys_.size(), ipc_cursor_id_); |
159 ipc_cursor_id_); | |
160 prefetch_keys_.clear(); | 150 prefetch_keys_.clear(); |
161 prefetch_primary_keys_.clear(); | 151 prefetch_primary_keys_.clear(); |
162 prefetch_values_.clear(); | 152 prefetch_values_.clear(); |
163 | 153 |
164 pending_onsuccess_callbacks_ = 0; | 154 pending_onsuccess_callbacks_ = 0; |
165 } | 155 } |
166 | 156 |
167 } // namespace content | 157 } // namespace content |
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