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// 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/sync/glue/history_model_worker.h"
#include "base/memory/ref_counted.h"
#include "base/message_loop.h"
#include "base/synchronization/waitable_event.h"
#include "chrome/browser/history/history_db_task.h"
#include "content/public/browser/browser_thread.h"
using base::WaitableEvent;
using content::BrowserThread;
namespace browser_sync {
class WorkerTask : public history::HistoryDBTask {
public:
WorkerTask(
const syncer::WorkCallback& work,
WaitableEvent* done,
syncer::SyncerError* error)
: work_(work), done_(done), error_(error) {}
virtual bool RunOnDBThread(history::HistoryBackend* backend,
history::HistoryDatabase* db) OVERRIDE {
*error_ = work_.Run();
done_->Signal();
return true;
}
// Since the DoWorkAndWaitUntilDone() is syncronous, we don't need to run any
// code asynchronously on the main thread after completion.
virtual void DoneRunOnMainThread() OVERRIDE {}
protected:
virtual ~WorkerTask() {}
syncer::WorkCallback work_;
WaitableEvent* done_;
syncer::SyncerError* error_;
};
namespace {
// Post the work task on |history_service|'s DB thread from the UI
// thread.
void PostWorkerTask(const base::WeakPtr<HistoryService>& history_service,
const syncer::WorkCallback& work,
CancelableRequestConsumerT<int, 0>* cancelable_consumer,
WaitableEvent* done,
syncer::SyncerError* error) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (history_service.get()) {
scoped_refptr<WorkerTask> task(new WorkerTask(work, done, error));
history_service->ScheduleDBTask(task.get(), cancelable_consumer);
} else {
*error = syncer::CANNOT_DO_WORK;
done->Signal();
}
}
} // namespace
HistoryModelWorker::HistoryModelWorker(
const base::WeakPtr<HistoryService>& history_service)
: history_service_(history_service) {
CHECK(history_service.get());
}
syncer::SyncerError HistoryModelWorker::DoWorkAndWaitUntilDone(
const syncer::WorkCallback& work) {
syncer::SyncerError error = syncer::UNSET;
WaitableEvent done(false, false);
if (BrowserThread::PostTask(BrowserThread::UI, FROM_HERE,
base::Bind(&PostWorkerTask,
history_service_, work,
&cancelable_consumer_,
&done, &error))) {
done.Wait();
} else {
error = syncer::CANNOT_DO_WORK;
}
return error;
}
syncer::ModelSafeGroup HistoryModelWorker::GetModelSafeGroup() {
return syncer::GROUP_HISTORY;
}
HistoryModelWorker::~HistoryModelWorker() {}
} // namespace browser_sync
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