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// Copyright 2013 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 "components/webdata/common/web_database_service.h"
#include <stddef.h>
#include <utility>
#include "base/bind.h"
#include "base/location.h"
#include "base/threading/thread_task_runner_handle.h"
#include "components/webdata/common/web_data_request_manager.h"
#include "components/webdata/common/web_data_results.h"
#include "components/webdata/common/web_data_service_consumer.h"
#include "components/webdata/common/web_database_backend.h"
using base::Bind;
using base::FilePath;
// Receives messages from the backend on the DB thread, posts them to
// WebDatabaseService on the UI thread.
class WebDatabaseService::BackendDelegate
: public WebDatabaseBackend::Delegate {
public:
BackendDelegate(const base::WeakPtr<WebDatabaseService>& web_database_service)
: web_database_service_(web_database_service),
callback_thread_(base::ThreadTaskRunnerHandle::Get()) {}
void DBLoaded(sql::InitStatus status,
const std::string& diagnostics) override {
callback_thread_->PostTask(
FROM_HERE, base::Bind(&WebDatabaseService::OnDatabaseLoadDone,
web_database_service_, status, diagnostics));
}
private:
const base::WeakPtr<WebDatabaseService> web_database_service_;
scoped_refptr<base::SingleThreadTaskRunner> callback_thread_;
};
WebDatabaseService::WebDatabaseService(
const base::FilePath& path,
scoped_refptr<base::SingleThreadTaskRunner> ui_thread,
scoped_refptr<base::SingleThreadTaskRunner> db_thread)
: base::RefCountedDeleteOnSequence<WebDatabaseService>(ui_thread),
path_(path),
db_loaded_(false),
db_thread_(db_thread),
weak_ptr_factory_(this) {
// WebDatabaseService should be instantiated on UI thread.
DCHECK(ui_thread->BelongsToCurrentThread());
// WebDatabaseService requires DB thread if instantiated.
DCHECK(db_thread.get());
}
WebDatabaseService::~WebDatabaseService() {
}
void WebDatabaseService::AddTable(std::unique_ptr<WebDatabaseTable> table) {
if (!web_db_backend_.get()) {
web_db_backend_ = new WebDatabaseBackend(
path_, new BackendDelegate(weak_ptr_factory_.GetWeakPtr()), db_thread_);
}
web_db_backend_->AddTable(std::move(table));
}
void WebDatabaseService::LoadDatabase() {
DCHECK(web_db_backend_.get());
db_thread_->PostTask(
FROM_HERE, Bind(&WebDatabaseBackend::InitDatabase, web_db_backend_));
}
void WebDatabaseService::ShutdownDatabase() {
db_loaded_ = false;
loaded_callbacks_.clear();
error_callbacks_.clear();
weak_ptr_factory_.InvalidateWeakPtrs();
if (!web_db_backend_.get())
return;
db_thread_->PostTask(
FROM_HERE, Bind(&WebDatabaseBackend::ShutdownDatabase, web_db_backend_));
}
WebDatabase* WebDatabaseService::GetDatabaseOnDB() const {
DCHECK(db_thread_->BelongsToCurrentThread());
return web_db_backend_.get() ? web_db_backend_->database() : NULL;
}
scoped_refptr<WebDatabaseBackend> WebDatabaseService::GetBackend() const {
return web_db_backend_;
}
void WebDatabaseService::ScheduleDBTask(
const tracked_objects::Location& from_here,
const WriteTask& task) {
DCHECK(web_db_backend_.get());
std::unique_ptr<WebDataRequest> request =
web_db_backend_->request_manager()->NewRequest(nullptr);
db_thread_->PostTask(
from_here, Bind(&WebDatabaseBackend::DBWriteTaskWrapper, web_db_backend_,
task, base::Passed(&request)));
}
WebDataServiceBase::Handle WebDatabaseService::ScheduleDBTaskWithResult(
const tracked_objects::Location& from_here,
const ReadTask& task,
WebDataServiceConsumer* consumer) {
DCHECK(consumer);
DCHECK(web_db_backend_.get());
std::unique_ptr<WebDataRequest> request =
web_db_backend_->request_manager()->NewRequest(consumer);
WebDataServiceBase::Handle handle = request->GetHandle();
db_thread_->PostTask(
from_here, Bind(&WebDatabaseBackend::DBReadTaskWrapper, web_db_backend_,
task, base::Passed(&request)));
return handle;
}
void WebDatabaseService::CancelRequest(WebDataServiceBase::Handle h) {
if (!web_db_backend_.get())
return;
web_db_backend_->request_manager()->CancelRequest(h);
}
void WebDatabaseService::RegisterDBLoadedCallback(
const DBLoadedCallback& callback) {
loaded_callbacks_.push_back(callback);
}
void WebDatabaseService::RegisterDBErrorCallback(
const DBLoadErrorCallback& callback) {
error_callbacks_.push_back(callback);
}
void WebDatabaseService::OnDatabaseLoadDone(sql::InitStatus status,
const std::string& diagnostics) {
// The INIT_OK_WITH_DATA_LOSS status is an initialization success but with
// suspected data loss, so we also run the error callbacks.
if (status != sql::INIT_OK) {
// Notify that the database load failed.
while (!error_callbacks_.empty()) {
// The profile error callback is a message box that runs in a nested run
// loop. While it's being displayed, other OnDatabaseLoadDone() will run
// (posted from WebDatabaseBackend::Delegate::DBLoaded()). We need to make
// sure that after the callback running the message box returns, it checks
// |error_callbacks_| before it accesses it.
DBLoadErrorCallback error_callback = error_callbacks_.back();
error_callbacks_.pop_back();
if (!error_callback.is_null())
error_callback.Run(status, diagnostics);
}
}
if (status == sql::INIT_OK || status == sql::INIT_OK_WITH_DATA_LOSS) {
db_loaded_ = true;
while (!loaded_callbacks_.empty()) {
DBLoadedCallback loaded_callback = loaded_callbacks_.back();
loaded_callbacks_.pop_back();
if (!loaded_callback.is_null())
loaded_callback.Run();
}
}
}
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