| // 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 "chrome/browser/value_store/value_store_frontend.h" |
| |
| #include "base/bind.h" |
| #include "base/debug/trace_event.h" |
| #include "base/files/file_path.h" |
| #include "base/logging.h" |
| #include "chrome/browser/value_store/leveldb_value_store.h" |
| #include "content/public/browser/browser_thread.h" |
| |
| using content::BrowserThread; |
| |
| class ValueStoreFrontend::Backend : public base::RefCountedThreadSafe<Backend> { |
| public: |
| Backend() : storage_(NULL) {} |
| |
| void Init(const base::FilePath& db_path) { |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); |
| DCHECK(!storage_); |
| TRACE_EVENT0("ValueStoreFrontend::Backend", "Init"); |
| db_path_ = db_path; |
| storage_ = new LeveldbValueStore(db_path); |
| } |
| |
| // This variant is useful for testing (using a mock ValueStore). |
| void InitWithStore(scoped_ptr<ValueStore> storage) { |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); |
| DCHECK(!storage_); |
| storage_ = storage.release(); |
| } |
| |
| void Get(const std::string& key, |
| const ValueStoreFrontend::ReadCallback& callback) { |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); |
| ValueStore::ReadResult result = storage_->Get(key); |
| |
| // Extract the value from the ReadResult and pass ownership of it to the |
| // callback. |
| scoped_ptr<base::Value> value; |
| if (!result->HasError()) { |
| result->settings().RemoveWithoutPathExpansion(key, &value); |
| } else { |
| LOG(WARNING) << "Reading " << key << " from " << db_path_.value() |
| << " failed: " << result->error().message; |
| } |
| |
| BrowserThread::PostTask(BrowserThread::UI, FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::RunCallback, |
| this, callback, base::Passed(&value))); |
| } |
| |
| void Set(const std::string& key, scoped_ptr<base::Value> value) { |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); |
| // We don't need the old value, so skip generating changes. |
| storage_->Set(ValueStore::IGNORE_QUOTA | ValueStore::NO_GENERATE_CHANGES, |
| key, *value.get()); |
| } |
| |
| void Remove(const std::string& key) { |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE)); |
| storage_->Remove(key); |
| } |
| |
| private: |
| friend class base::RefCountedThreadSafe<Backend>; |
| |
| virtual ~Backend() { |
| if (BrowserThread::CurrentlyOn(BrowserThread::FILE)) { |
| delete storage_; |
| } else { |
| BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE, storage_); |
| } |
| } |
| |
| void RunCallback(const ValueStoreFrontend::ReadCallback& callback, |
| scoped_ptr<base::Value> value) { |
| DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI)); |
| callback.Run(value.Pass()); |
| } |
| |
| // The actual ValueStore that handles persisting the data to disk. Used |
| // exclusively on the FILE thread. |
| ValueStore* storage_; |
| |
| base::FilePath db_path_; |
| |
| DISALLOW_COPY_AND_ASSIGN(Backend); |
| }; |
| |
| ValueStoreFrontend::ValueStoreFrontend() |
| : backend_(new Backend()) { |
| } |
| |
| ValueStoreFrontend::ValueStoreFrontend(const base::FilePath& db_path) |
| : backend_(new Backend()) { |
| Init(db_path); |
| } |
| |
| ValueStoreFrontend::ValueStoreFrontend(ValueStore* value_store) |
| : backend_(new Backend()) { |
| BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::InitWithStore, |
| backend_, base::Passed(scoped_ptr<ValueStore>(value_store)))); |
| } |
| |
| ValueStoreFrontend::~ValueStoreFrontend() { |
| DCHECK(CalledOnValidThread()); |
| } |
| |
| void ValueStoreFrontend::Init(const base::FilePath& db_path) { |
| BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::Init, |
| backend_, db_path)); |
| } |
| |
| void ValueStoreFrontend::Get(const std::string& key, |
| const ReadCallback& callback) { |
| DCHECK(CalledOnValidThread()); |
| |
| BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::Get, |
| backend_, key, callback)); |
| } |
| |
| void ValueStoreFrontend::Set(const std::string& key, |
| scoped_ptr<base::Value> value) { |
| DCHECK(CalledOnValidThread()); |
| |
| BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::Set, |
| backend_, key, base::Passed(&value))); |
| } |
| |
| void ValueStoreFrontend::Remove(const std::string& key) { |
| DCHECK(CalledOnValidThread()); |
| |
| BrowserThread::PostTask(BrowserThread::FILE, FROM_HERE, |
| base::Bind(&ValueStoreFrontend::Backend::Remove, |
| backend_, key)); |
| } |