dfdb6a95f4
only. Will enable other process types after testing them. R=jar,jam@chromium.org,sky BUG=145294 Review URL: https://chromiumcodereview.appspot.com/10885016 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@154501 0039d316-1c4b-4281-b951-d872f2087c98
73 lines
2.6 KiB
C++
73 lines
2.6 KiB
C++
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef CONTENT_BROWSER_HISTOGRAM_CONTROLLER_H_
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#define CONTENT_BROWSER_HISTOGRAM_CONTROLLER_H_
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#include <string>
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#include <vector>
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#include "base/memory/singleton.h"
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namespace content {
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class HistogramSubscriber;
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// HistogramController is used on the browser process to collect histogram data.
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// Only the browser UI thread is allowed to interact with the
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// HistogramController object.
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class HistogramController {
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public:
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// Returns the HistogramController object for the current process, or NULL if
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// none.
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static HistogramController* GetInstance();
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// Normally instantiated when the child process is launched. Only one instance
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// should be created per process.
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HistogramController();
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virtual ~HistogramController();
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// Register the subscriber so that it will be called when for example
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// OnHistogramDataCollected is returning histogram data from a child process.
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// This is called on UI thread.
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void Register(HistogramSubscriber* subscriber);
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// Unregister the subscriber so that it will not be called when for example
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// OnHistogramDataCollected is returning histogram data from a child process.
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// Safe to call even if caller is not the current subscriber.
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void Unregister(const HistogramSubscriber* subscriber);
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// Contact all processes and get their histogram data.
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void GetHistogramData(int sequence_number);
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// Notify the |subscriber_| that it should expect at least |pending_processes|
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// additional calls to OnHistogramDataCollected(). OnPendingProcess() may be
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// called repeatedly; the last call will have |end| set to true, indicating
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// that there is no longer a possibility for the count of pending processes to
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// increase. This is called on the UI thread.
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void OnPendingProcesses(int sequence_number, int pending_processes, bool end);
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// Send the |histogram| back to the |subscriber_|.
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// This can be called from any thread.
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void OnHistogramDataCollected(
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int sequence_number,
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const std::vector<std::string>& pickled_histograms);
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private:
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friend struct DefaultSingletonTraits<HistogramController>;
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// Contact PLUGIN and GPU child processes and get their histogram data.
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// TODO(rtenneti): Enable getting histogram data for other processes like
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// PPAPI and NACL.
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void GetHistogramDataFromChildProcesses(int sequence_number);
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HistogramSubscriber* subscriber_;
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DISALLOW_COPY_AND_ASSIGN(HistogramController);
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};
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} // namespace content
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#endif // CONTENT_BROWSER_HISTOGRAM_CONTROLLER_H_
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