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// Copyright 2014 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 "extensions/browser/value_store/value_store_frontend.h"
#include <utility>
#include "base/bind.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/macros.h"
#include "base/trace_event/trace_event.h"
#include "content/public/browser/browser_thread.h"
#include "extensions/browser/value_store/leveldb_value_store.h"
#include "extensions/browser/value_store/value_store_factory.h"
using content::BrowserThread;
using extensions::ValueStoreFactory;
class ValueStoreFrontend::Backend : public base::RefCountedThreadSafe<Backend> {
public:
Backend(const scoped_refptr<ValueStoreFactory>& store_factory,
BackendType backend_type)
: store_factory_(store_factory), backend_type_(backend_type) {}
void Get(const std::string& key,
const ValueStoreFrontend::ReadCallback& callback) {
DCHECK_CURRENTLY_ON(BrowserThread::FILE);
LazyInit();
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->status().ok()) {
result->settings().RemoveWithoutPathExpansion(key, &value);
} else {
LOG(WARNING) << "Reading " << key << " from " << db_path_.value()
<< " failed: " << result->status().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_CURRENTLY_ON(BrowserThread::FILE);
LazyInit();
// We don't need the old value, so skip generating changes.
ValueStore::WriteResult result = storage_->Set(
ValueStore::IGNORE_QUOTA | ValueStore::NO_GENERATE_CHANGES,
key,
*value.get());
LOG_IF(ERROR, !result->status().ok()) << "Error while writing " << key
<< " to " << db_path_.value();
}
void Remove(const std::string& key) {
DCHECK_CURRENTLY_ON(BrowserThread::FILE);
LazyInit();
storage_->Remove(key);
}
private:
friend class base::RefCountedThreadSafe<Backend>;
virtual ~Backend() {
if (storage_ && !BrowserThread::CurrentlyOn(BrowserThread::FILE))
BrowserThread::DeleteSoon(BrowserThread::FILE, FROM_HERE,
storage_.release());
}
void LazyInit() {
DCHECK_CURRENTLY_ON(BrowserThread::FILE);
if (storage_)
return;
TRACE_EVENT0("ValueStoreFrontend::Backend", "LazyInit");
switch (backend_type_) {
case BackendType::RULES:
storage_ = store_factory_->CreateRulesStore();
break;
case BackendType::STATE:
storage_ = store_factory_->CreateStateStore();
break;
}
}
void RunCallback(const ValueStoreFrontend::ReadCallback& callback,
scoped_ptr<base::Value> value) {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
callback.Run(std::move(value));
}
// The factory which will be used to lazily create the ValueStore when needed.
// Used exclusively on the FILE thread.
scoped_refptr<ValueStoreFactory> store_factory_;
BackendType backend_type_;
// The actual ValueStore that handles persisting the data to disk. Used
// exclusively on the FILE thread.
scoped_ptr<ValueStore> storage_;
base::FilePath db_path_;
DISALLOW_COPY_AND_ASSIGN(Backend);
};
ValueStoreFrontend::ValueStoreFrontend(
const scoped_refptr<ValueStoreFactory>& store_factory,
BackendType backend_type)
: backend_(new Backend(store_factory, backend_type)) {}
ValueStoreFrontend::~ValueStoreFrontend() {
DCHECK(CalledOnValidThread());
}
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));
}
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