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
192
193
194
195
196
197
198
199
200
201
202
203
|
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "webkit/dom_storage/dom_storage_cached_area.h"
#include "base/basictypes.h"
#include "base/time.h"
#include "base/metrics/histogram.h"
#include "webkit/dom_storage/dom_storage_map.h"
#include "webkit/dom_storage/dom_storage_proxy.h"
namespace dom_storage {
DomStorageCachedArea::DomStorageCachedArea(
int64 namespace_id, const GURL& origin, DomStorageProxy* proxy)
: ignore_all_mutations_(false),
namespace_id_(namespace_id), origin_(origin),
proxy_(proxy), weak_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
}
DomStorageCachedArea::~DomStorageCachedArea() {
}
unsigned DomStorageCachedArea::GetLength(int connection_id) {
PrimeIfNeeded(connection_id);
return map_->Length();
}
NullableString16 DomStorageCachedArea::GetKey(
int connection_id, unsigned index) {
PrimeIfNeeded(connection_id);
return map_->Key(index);
}
NullableString16 DomStorageCachedArea::GetItem(
int connection_id, const string16& key) {
PrimeIfNeeded(connection_id);
return map_->GetItem(key);
}
bool DomStorageCachedArea::SetItem(
int connection_id, const string16& key,
const string16& value, const GURL& page_url) {
// A quick check to reject obviously overbudget items to avoid
// the priming the cache.
if (key.length() + value.length() > dom_storage::kPerAreaQuota)
return false;
PrimeIfNeeded(connection_id);
NullableString16 unused;
if (!map_->SetItem(key, value, &unused))
return false;
// Ignore mutations to 'key' until OnSetItemComplete.
ignore_key_mutations_[key]++;
proxy_->SetItem(
connection_id, key, value, page_url,
base::Bind(&DomStorageCachedArea::OnSetItemComplete,
weak_factory_.GetWeakPtr(), key));
return true;
}
void DomStorageCachedArea::RemoveItem(
int connection_id, const string16& key, const GURL& page_url) {
PrimeIfNeeded(connection_id);
string16 unused;
if (!map_->RemoveItem(key, &unused))
return;
// Ignore mutations to 'key' until OnRemoveItemComplete.
ignore_key_mutations_[key]++;
proxy_->RemoveItem(
connection_id, key, page_url,
base::Bind(&DomStorageCachedArea::OnRemoveItemComplete,
weak_factory_.GetWeakPtr(), key));
}
void DomStorageCachedArea::Clear(int connection_id, const GURL& page_url) {
// No need to prime the cache in this case.
Reset();
map_ = new DomStorageMap(dom_storage::kPerAreaQuota);
// Ignore all mutations until OnClearComplete time.
ignore_all_mutations_ = true;
proxy_->ClearArea(
connection_id, page_url,
base::Bind(&DomStorageCachedArea::OnClearComplete,
weak_factory_.GetWeakPtr()));
}
void DomStorageCachedArea::ApplyMutation(
const NullableString16& key, const NullableString16& new_value) {
if (!map_ || ignore_all_mutations_)
return;
if (key.is_null()) {
// It's a clear event.
scoped_refptr<DomStorageMap> old = map_;
map_ = new DomStorageMap(dom_storage::kPerAreaQuota);
// We have to retain local additions which happened after this
// clear operation from another process.
std::map<string16, int>::iterator iter = ignore_key_mutations_.begin();
while (iter != ignore_key_mutations_.end()) {
NullableString16 value = old->GetItem(iter->first);
if (!value.is_null()) {
NullableString16 unused;
map_->SetItem(iter->first, value.string(), &unused);
}
++iter;
}
return;
}
// We have to retain local changes.
if (should_ignore_key_mutation(key.string()))
return;
if (new_value.is_null()) {
// It's a remove item event.
string16 unused;
map_->RemoveItem(key.string(), &unused);
return;
}
// It's a set item event.
// We turn off quota checking here to accomodate the over budget
// allowance that's provided in the browser process.
NullableString16 unused;
map_->set_quota(kint32max);
map_->SetItem(key.string(), new_value.string(), &unused);
map_->set_quota(dom_storage::kPerAreaQuota);
}
size_t DomStorageCachedArea::MemoryBytesUsedByCache() const {
return map_ ? map_->bytes_used() : 0;
}
void DomStorageCachedArea::Prime(int connection_id) {
DCHECK(!map_);
// The LoadArea method is actually synchronous, but we have to
// wait for an asyncly delivered message to know when incoming
// mutation events should be applied. Our valuemap is plucked
// from ipc stream out of order, mutations in front if it need
// to be ignored.
// Ignore all mutations until OnLoadComplete time.
ignore_all_mutations_ = true;
ValuesMap values;
base::TimeTicks before = base::TimeTicks::Now();
proxy_->LoadArea(
connection_id, &values,
base::Bind(&DomStorageCachedArea::OnLoadComplete,
weak_factory_.GetWeakPtr()));
UMA_HISTOGRAM_TIMES("LocalStorage.TimeToPrimeLocalStorage",
base::TimeTicks::Now() - before);
map_ = new DomStorageMap(dom_storage::kPerAreaQuota);
map_->SwapValues(&values);
}
void DomStorageCachedArea::Reset() {
map_ = NULL;
weak_factory_.InvalidateWeakPtrs();
ignore_key_mutations_.clear();
ignore_all_mutations_ = false;
}
void DomStorageCachedArea::OnLoadComplete(bool success) {
DCHECK(success);
DCHECK(ignore_all_mutations_);
ignore_all_mutations_ = false;
}
void DomStorageCachedArea::OnSetItemComplete(
const string16& key, bool success) {
if (!success) {
Reset();
return;
}
std::map<string16, int>::iterator found = ignore_key_mutations_.find(key);
DCHECK(found != ignore_key_mutations_.end());
if (--found->second == 0)
ignore_key_mutations_.erase(found);
}
void DomStorageCachedArea::OnRemoveItemComplete(
const string16& key, bool success) {
DCHECK(success);
std::map<string16, int>::iterator found = ignore_key_mutations_.find(key);
DCHECK(found != ignore_key_mutations_.end());
if (--found->second == 0)
ignore_key_mutations_.erase(found);
}
void DomStorageCachedArea::OnClearComplete(bool success) {
DCHECK(success);
DCHECK(ignore_all_mutations_);
ignore_all_mutations_ = false;
}
} // namespace dom_storage
|
