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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 CONTENT_BROWSER_METRICS_HISTOGRAM_CONTROLLER_H_
#define CONTENT_BROWSER_METRICS_HISTOGRAM_CONTROLLER_H_
#include <map>
#include <string>
#include <vector>
#include "base/memory/raw_ptr.h"
#include "base/memory/singleton.h"
#include "base/memory/writable_shared_memory_region.h"
#include "content/common/histogram_fetcher.mojom.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace content {
class HistogramSubscriber;
class ChildProcessHost;
class RenderProcessHost;
// HistogramController is used on the browser process to collect histogram data.
// Only the browser UI thread is allowed to interact with the
// HistogramController object.
class HistogramController {
public:
// Returns the HistogramController object for the current process, or NULL if
// none.
static HistogramController* GetInstance();
// Normally instantiated when the child process is launched. Only one instance
// should be created per process.
HistogramController();
HistogramController(const HistogramController&) = delete;
HistogramController& operator=(const HistogramController&) = delete;
virtual ~HistogramController();
// Register the subscriber so that it will be called when for example
// OnHistogramDataCollected is returning histogram data from a child process.
// This is called on UI thread.
void Register(HistogramSubscriber* subscriber);
// Unregister the subscriber so that it will not be called when for example
// OnHistogramDataCollected is returning histogram data from a child process.
// Safe to call even if caller is not the current subscriber.
void Unregister(const HistogramSubscriber* subscriber);
// Contact all processes and get their histogram data.
void GetHistogramData(int sequence_number);
// Send the |histogram| back to the |subscriber_|.
// This can be called from any thread.
void OnHistogramDataCollected(
int sequence_number,
const std::vector<std::string>& pickled_histograms);
template <class T>
void SetHistogramMemory(T*, base::WritableSharedMemoryRegion);
// Some hosts can be re-used before Mojo recognizes that their connections
// are invalid because the previous child process died.
template <class T>
void NotifyChildDied(T*);
private:
friend struct base::LeakySingletonTraits<HistogramController>;
raw_ptr<HistogramSubscriber> subscriber_;
template <class T>
using ChildHistogramFetcherMap =
std::map<T*, mojo::Remote<content::mojom::ChildHistogramFetcher>>;
template <class T>
void InsertChildHistogramFetcherInterface(
T* host,
mojo::Remote<content::mojom::ChildHistogramFetcher>
child_histogram_fetcher);
template <class T>
content::mojom::ChildHistogramFetcher* GetChildHistogramFetcherInterface(
T* host);
template <class T>
void RemoveChildHistogramFetcherInterface(T* host);
// Specialize this template for each ChildHistogramFetcherMap defined below.
template <class T>
ChildHistogramFetcherMap<T>& GetChildHistogramFetcherMap();
ChildHistogramFetcherMap<RenderProcessHost> renderer_histogram_fetchers_;
ChildHistogramFetcherMap<ChildProcessHost> child_histogram_fetchers_;
};
} // namespace content
#endif // CONTENT_BROWSER_METRICS_HISTOGRAM_CONTROLLER_H_
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