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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_ASH_POLICY_STATUS_COLLECTOR_STATUS_COLLECTOR_STATE_H_
#define CHROME_BROWSER_ASH_POLICY_STATUS_COLLECTOR_STATUS_COLLECTOR_STATE_H_
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/sequenced_task_runner.h"
#include "chrome/browser/ash/policy/status_collector/status_collector.h"
#include "components/policy/proto/device_management_backend.pb.h"
namespace policy {
// Helper class for state tracking of status queries (sync and async). Creates
// status blobs in the constructor and sends them to the the status response
// callback in the destructor.
//
// Some methods queue async queries to collect data. The response callback of
// these queries holds a reference to the instance of this class, so that the
// destructor will not be invoked and the status response callback will not be
// fired until the original owner of the instance releases its reference and all
// async queries finish.
//
// Therefore, if you create an instance of this class, make sure to release your
// reference after querying all async queries (if any), e.g. by using a local
// |scoped_refptr<StatusCollectorState>| and letting it go out of scope.
class StatusCollectorState
: public base::RefCountedThreadSafe<StatusCollectorState> {
public:
explicit StatusCollectorState(
const scoped_refptr<base::SequencedTaskRunner> task_runner,
StatusCollectorCallback response);
// Returns a reference to the internal state of this object.
StatusCollectorParams& response_params();
protected:
friend class base::RefCountedThreadSafe<StatusCollectorState>;
// Posts the response on the UI thread. As long as there is an outstanding
// async query, the query holds a reference to us, so the destructor is
// not called.
virtual ~StatusCollectorState();
const scoped_refptr<base::SequencedTaskRunner> task_runner_;
StatusCollectorCallback response_;
StatusCollectorParams response_params_;
};
} // namespace policy
#endif // CHROME_BROWSER_ASH_POLICY_STATUS_COLLECTOR_STATUS_COLLECTOR_STATE_H_
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