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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.
#ifndef COMPONENTS_METRICS_METRICS_LOG_MANAGER_H_
#define COMPONENTS_METRICS_METRICS_LOG_MANAGER_H_
#include <stddef.h>
#include <memory>
#include <string>
#include <vector>
#include "base/macros.h"
#include "components/metrics/metrics_log.h"
namespace metrics {
class MetricsLogStore;
// Manages all the log objects used by a MetricsService implementation. Keeps
// track of an in-progress log and a paused log.
class MetricsLogManager {
public:
MetricsLogManager();
~MetricsLogManager();
// Makes |log| the current_log. This should only be called if there is not a
// current log.
void BeginLoggingWithLog(std::unique_ptr<MetricsLog> log);
// Returns the in-progress log.
MetricsLog* current_log() { return current_log_.get(); }
// Closes |current_log_|, compresses it, and stores it in the |log_store| for
// later, leaving |current_log_| nullptr.
void FinishCurrentLog(MetricsLogStore* log_store);
// Closes and discards |current_log|.
void DiscardCurrentLog();
// Sets current_log to nullptr, but saves the current log for future use with
// ResumePausedLog(). Only one log may be paused at a time.
// TODO(stuartmorgan): Pause/resume support is really a workaround for a
// design issue in initial log writing; that should be fixed, and pause/resume
// removed.
void PauseCurrentLog();
// Restores the previously paused log (if any) to current_log().
// This should only be called if there is not a current log.
void ResumePausedLog();
private:
// The log that we are still appending to.
std::unique_ptr<MetricsLog> current_log_;
// A paused, previously-current log.
std::unique_ptr<MetricsLog> paused_log_;
DISALLOW_COPY_AND_ASSIGN(MetricsLogManager);
};
} // namespace metrics
#endif // COMPONENTS_METRICS_METRICS_LOG_MANAGER_H_
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