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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/safe_browsing/incident_reporting/delayed_callback_runner.h"
#include "base/location.h"
#include "content/public/browser/browser_thread.h"
namespace safe_browsing {
DelayedCallbackRunner::DelayedCallbackRunner(
base::TimeDelta delay,
const scoped_refptr<base::TaskRunner>& task_runner)
: task_runner_(task_runner),
has_work_(false),
timer_(FROM_HERE, delay, this, &DelayedCallbackRunner::OnTimer) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
DelayedCallbackRunner::~DelayedCallbackRunner() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
}
void DelayedCallbackRunner::RegisterCallback(base::OnceClosure callback) {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
callbacks_.push(std::move(callback));
}
void DelayedCallbackRunner::Start() {
DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
// Nothing to do if the runner is already running or nothing has been added.
if (has_work_ || callbacks_.empty())
return;
// Prime the system with the first callback.
has_work_ = true;
// Point the starter pistol in the air and pull the trigger.
timer_.Reset();
}
void DelayedCallbackRunner::OnTimer() {
// Run the next callback on the task runner.
task_runner_->PostTask(FROM_HERE, std::move(callbacks_.front()));
callbacks_.pop();
// Remove this callback and get ready for the next if there is one.
has_work_ = !callbacks_.empty();
if (has_work_)
timer_.Reset();
}
} // namespace safe_browsing
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