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// Copyright 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 "components/sync/engine/browser_thread_model_worker.h"
#include "base/bind.h"
#include "base/callback.h"
#include "base/single_thread_task_runner.h"
#include "base/synchronization/waitable_event.h"
using base::SingleThreadTaskRunner;
namespace syncer {
BrowserThreadModelWorker::BrowserThreadModelWorker(
const scoped_refptr<SingleThreadTaskRunner>& runner,
ModelSafeGroup group)
: runner_(runner), group_(group) {}
SyncerError BrowserThreadModelWorker::DoWorkAndWaitUntilDoneImpl(
const WorkCallback& work) {
SyncerError error = UNSET;
if (runner_->BelongsToCurrentThread()) {
DLOG(WARNING) << "Already on thread " << runner_;
return work.Run();
}
// Signaled when the task is deleted, i.e. after it runs or when it is
// abandoned.
base::WaitableEvent work_done_or_abandoned(
base::WaitableEvent::ResetPolicy::AUTOMATIC,
base::WaitableEvent::InitialState::NOT_SIGNALED);
if (!runner_->PostTask(
FROM_HERE,
base::Bind(
&BrowserThreadModelWorker::CallDoWorkAndSignalTask, this, work,
base::Passed(syncer::ScopedEventSignal(&work_done_or_abandoned)),
&error))) {
DLOG(WARNING) << "Failed to post task to runner " << runner_;
error = CANNOT_DO_WORK;
return error;
}
work_done_or_abandoned.Wait();
return error;
}
ModelSafeGroup BrowserThreadModelWorker::GetModelSafeGroup() {
return group_;
}
bool BrowserThreadModelWorker::IsOnModelThread() {
return runner_->BelongsToCurrentThread();
}
BrowserThreadModelWorker::~BrowserThreadModelWorker() {}
void BrowserThreadModelWorker::CallDoWorkAndSignalTask(
const WorkCallback& work,
syncer::ScopedEventSignal scoped_event_signal,
SyncerError* error) {
DCHECK(runner_->BelongsToCurrentThread());
if (!IsStopped())
*error = work.Run();
// The event in |scoped_event_signal| is signaled at the end of this scope.
}
} // namespace syncer
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