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// Copyright 2015 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 CHROME_BROWSER_PROCESS_RESOURCE_USAGE_H_
#define CHROME_BROWSER_PROCESS_RESOURCE_USAGE_H_
#include <deque>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/threading/thread_checker.h"
#include "chrome/common/resource_usage_reporter.mojom.h"
#include "third_party/WebKit/public/web/WebCache.h"
// Provides resource usage information about a child process.
//
// This is a wrapper around the ResourceUsageReporter Mojo service that exposes
// information about resources used by a child process. Currently, this is only
// V8 memory and Blink resource cache usage, but could be expanded to include
// other resources. This is intended for status viewers such as the task
// manager and about://memory-internals.
//
// To create:
// 1. Create a ResourceUsageReporterPtr and obtain an InterfaceRequest<> using
// mojo::GetProxy.
// 2. Use the child process's service registry to connect to the service using
// the InterfaceRequest<>. Note, ServiceRegistry is thread hostile and
// must always be accessed from the same thread. However, InterfaceRequest<>
// can be passed safely between threads, and therefore a task can be posted
// to the ServiceRegistry thread to connect to the remote service.
// 3. Pass the ResourceUsageReporterPtr to the constructor.
//
// Example:
// void Foo::ConnectToService(
// mojo::InterfaceRequest<ResourceUsageReporter> req) {
// content::ServiceRegistry* registry = host_->GetServiceRegistry();
// registry->ConnectToRemoteService(req.Pass());
// }
//
// ...
// ResourceUsageReporterPtr service;
// mojo::InterfaceRequest<ResourceUsageReporter> request =
// mojo::GetProxy(&service);
// content::BrowserThread::PostTask(
// content::BrowserThread::IO, FROM_HERE,
// base::Bind(&Foo::ConnectToService, this, base::Passed(&request)));
// resource_usage_.reset(new ProcessResourceUsage(service.Pass()));
// ...
//
// Note: ProcessResourceUsage is thread-hostile and must live on a single
// thread.
class ProcessResourceUsage {
public:
// Must be called from the same thread that created |service|.
explicit ProcessResourceUsage(ResourceUsageReporterPtr service);
~ProcessResourceUsage();
// Refresh the resource usage information. |callback| is invoked when the
// usage data is updated, or when the IPC connection is lost.
void Refresh(const base::Closure& callback);
// Get V8 memory usage information.
bool ReportsV8MemoryStats() const;
size_t GetV8MemoryAllocated() const;
size_t GetV8MemoryUsed() const;
// Get Blink resource cache information.
blink::WebCache::ResourceTypeStats GetWebCoreCacheStats() const;
private:
// Mojo IPC callback.
void OnRefreshDone(ResourceUsageDataPtr data);
void RunPendingRefreshCallbacks();
ResourceUsageReporterPtr service_;
bool update_in_progress_;
std::deque<base::Closure> refresh_callbacks_;
ResourceUsageDataPtr stats_;
base::ThreadChecker thread_checker_;
DISALLOW_COPY_AND_ASSIGN(ProcessResourceUsage);
};
#endif // CHROME_BROWSER_PROCESS_RESOURCE_USAGE_H_
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