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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 | |
3 // found in the LICENSE file. | |
4 | |
5 #include "chrome/browser/value_store/value_store_frontend.h" | |
6 | |
7 #include "chrome/browser/value_store/failing_value_store.h" | |
8 #include "chrome/browser/value_store/leveldb_value_store.h" | |
9 #include "content/public/browser/browser_thread.h" | |
10 | |
11 using content::BrowserThread; | |
12 | |
13 class ValueStoreFrontend::Backend : public base::RefCountedThreadSafe<Backend> { | |
14 public: | |
15 explicit Backend(const FilePath& db_path) : storage_(NULL) { | |
16 } | |
17 | |
18 void Init(const FilePath& db_path) { | |
19 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
20 DCHECK(!storage_); | |
21 storage_ = LeveldbValueStore::Create(db_path); | |
22 if (!storage_) | |
23 storage_ = new FailingValueStore(); | |
24 } | |
25 | |
26 void Get(const std::string& key, | |
27 const ValueStoreFrontend::ReadCallback& callback) { | |
28 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
29 ValueStore::ReadResult result = storage_->Get(key); | |
30 | |
31 // Extract the value from the ReadResult and pass ownership of it to the | |
32 // callback. | |
33 base::Value* value = NULL; | |
34 if (!result->HasError()) | |
35 result->settings()->RemoveWithoutPathExpansion(key, &value); | |
36 | |
37 scoped_ptr<base::Value> passed_value(value); | |
38 BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, | |
39 base::Bind(&ValueStoreFrontend::Backend::RunCallback, | |
40 this, callback, base::Passed(passed_value.Pass()))); | |
41 } | |
42 | |
43 void Set(const std::string& key, scoped_ptr<base::Value> value) { | |
44 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
45 // We don't need the old value, so skip generating changes. | |
46 storage_->Set(ValueStore::IGNORE_QUOTA | ValueStore::NO_GENERATE_CHANGES, | |
47 key, *value.get()); | |
48 } | |
49 | |
50 void Remove(const std::string& key) { | |
51 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); | |
52 storage_->Remove(key); | |
53 } | |
54 | |
55 private: | |
56 friend class base::RefCountedThreadSafe<Backend>; | |
57 | |
58 virtual ~Backend() { | |
59 if (BrowserThread::CurrentlyOn(BrowserThread::FILE)) { | |
60 delete storage_; | |
61 } else { | |
62 BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE, storage_); | |
63 } | |
64 } | |
65 | |
66 void RunCallback(const ValueStoreFrontend::ReadCallback& callback, | |
67 scoped_ptr<base::Value> value) { | |
68 DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); | |
69 callback.Run(value.Pass()); | |
70 } | |
71 | |
72 // The actual ValueStore that handles persisting the data to disk. Used | |
73 // exclusively on the FILE thread. | |
74 ValueStore* storage_; | |
75 | |
76 DISALLOW_COPY_AND_ASSIGN(Backend); | |
77 }; | |
78 | |
79 ValueStoreFrontend::ValueStoreFrontend(const FilePath& db_path) | |
80 : backend_(new Backend(db_path)) { | |
81 BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, | |
82 base::Bind(&ValueStoreFrontend::Backend::Init, | |
83 backend_, db_path)); | |
Matt Perry
2012/06/12 20:42:16
This is what changed since last round. Moving the
| |
84 } | |
85 | |
86 ValueStoreFrontend::~ValueStoreFrontend() { | |
87 DCHECK(CalledOnValidThread()); | |
88 } | |
89 | |
90 void ValueStoreFrontend::Get(const std::string& key, | |
91 const ReadCallback& callback) { | |
92 DCHECK(CalledOnValidThread()); | |
93 | |
94 BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, | |
95 base::Bind(&ValueStoreFrontend::Backend::Get, | |
96 backend_, key, callback)); | |
97 } | |
98 | |
99 void ValueStoreFrontend::Set(const std::string& key, | |
100 scoped_ptr<base::Value> value) { | |
101 DCHECK(CalledOnValidThread()); | |
102 | |
103 BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, | |
104 base::Bind(&ValueStoreFrontend::Backend::Set, | |
105 backend_, key, base::Passed(value.Pass()))); | |
106 } | |
107 | |
108 void ValueStoreFrontend::Remove(const std::string& key) { | |
109 DCHECK(CalledOnValidThread()); | |
110 | |
111 BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, | |
112 base::Bind(&ValueStoreFrontend::Backend::Remove, | |
113 backend_, key)); | |
114 } | |
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