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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_METRICS_HISTOGRAM_SUBSCRIBER_H_
#define COMPONENTS_METRICS_HISTOGRAM_SUBSCRIBER_H_
#include <string>
#include <vector>
namespace metrics {
// Objects interested in receiving histograms derive from HistogramSubscriber.
class HistogramSubscriber {
public:
virtual ~HistogramSubscriber() = default;
// Send number of pending processes to subscriber. |end| is set to true if it
// is the last time. This is called on the UI thread.
virtual void OnPendingProcesses(int sequence_number,
int pending_processes,
bool end) = 0;
// Send |histogram| back to subscriber.
// This is called on the UI thread.
virtual void OnHistogramDataCollected(
int sequence_number,
const std::vector<std::string>& pickled_histograms) = 0;
};
} // namespace metrics
#endif // COMPONENTS_METRICS_HISTOGRAM_SUBSCRIBER_H_
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