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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/api/async_api_function.h"
#include "base/bind.h"
#include "extensions/browser/extension_system.h"
using content::BrowserThread;
namespace extensions {
// AsyncApiFunction
AsyncApiFunction::AsyncApiFunction() : work_thread_id_(BrowserThread::IO) {}
AsyncApiFunction::~AsyncApiFunction() {}
bool AsyncApiFunction::RunAsync() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
if (!PrePrepare() || !Prepare()) {
return false;
}
bool rv = BrowserThread::PostTask(
work_thread_id_,
FROM_HERE,
base::Bind(&AsyncApiFunction::WorkOnWorkThread, this));
DCHECK(rv);
return true;
}
bool AsyncApiFunction::PrePrepare() { return true; }
void AsyncApiFunction::Work() {}
void AsyncApiFunction::AsyncWorkStart() {
Work();
AsyncWorkCompleted();
}
void AsyncApiFunction::AsyncWorkCompleted() {
if (!BrowserThread::CurrentlyOn(BrowserThread::UI)) {
bool rv = BrowserThread::PostTask(
BrowserThread::UI,
FROM_HERE,
base::Bind(&AsyncApiFunction::RespondOnUIThread, this));
DCHECK(rv);
} else {
SendResponse(Respond());
}
}
void AsyncApiFunction::WorkOnWorkThread() {
DCHECK_CURRENTLY_ON(work_thread_id_);
DLOG_IF(ERROR, (work_thread_id_ == BrowserThread::UI))
<< "You have specified that AsyncApiFunction::Work() should happen on "
"the UI thread. This nullifies the point of this class. Either "
"specify a different thread or derive from a different class.";
AsyncWorkStart();
}
void AsyncApiFunction::RespondOnUIThread() {
DCHECK_CURRENTLY_ON(BrowserThread::UI);
SendResponse(Respond());
}
} // namespace extensions
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