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// Copyright 2017 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_PERFORMANCE_MANAGER_BROWSER_CHILD_PROCESS_WATCHER_H_
#define COMPONENTS_PERFORMANCE_MANAGER_BROWSER_CHILD_PROCESS_WATCHER_H_
#include <memory>
#include "base/containers/flat_map.h"
#include "base/process/process.h"
#include "components/performance_manager/public/browser_child_process_host_id.h"
#include "content/public/browser/browser_child_process_observer.h"
namespace base {
class Process;
}
namespace performance_manager {
class ProcessNodeImpl;
// Responsible for maintaining the process nodes for the browser, the GPU and
// utility process.
class BrowserChildProcessWatcher : public content::BrowserChildProcessObserver {
public:
BrowserChildProcessWatcher();
BrowserChildProcessWatcher(const BrowserChildProcessWatcher&) = delete;
BrowserChildProcessWatcher& operator=(const BrowserChildProcessWatcher&) =
delete;
~BrowserChildProcessWatcher() override;
// Initialize this watcher.
void Initialize();
// Tear down this watcher and any state it's gathered.
void TearDown();
// Returns the ProcessNode for the browser process or nullptr if it does not
// exist, which can happen in tests.
ProcessNodeImpl* browser_process_node() {
return browser_process_node_.get();
}
// Returns the ProcessNode for `id` or nullptr if it does not exist.
ProcessNodeImpl* GetChildProcessNode(BrowserChildProcessHostId id);
// Allows tests to create a ProcessNode for `data`. In production the
// ProcessNode is created when the host's child process is launched, but it's
// not always possible to launch a real process in tests so this can simulate
// it by passing a running process, possibly base::Process::Current(), in
// data.GetProcess(). The ProcessNode must not already exist. It will not be
// tied to the lifetime of the process.
void CreateChildProcessNodeForTesting(const content::ChildProcessData& data);
// Allows tests to delete the ProcessNode for `data`. In production this
// happens when the host's child process exits, but nodes created with
// CreateChildProcessNodeForTesting() won't be tied to the lifetime of
// a real process. Must not be called again if the node was already deleted.
void DeleteChildProcessNodeForTesting(const content::ChildProcessData& data);
// Allows tests to delete the browser process node, which is created by
// default in Initialize(). Must not be called again if the node was already
// deleted.
void DeleteBrowserProcessNodeForTesting();
private:
// BrowserChildProcessObserver overrides.
void BrowserChildProcessLaunchedAndConnected(
const content::ChildProcessData& data) override;
void BrowserChildProcessHostDisconnected(
const content::ChildProcessData& data) override;
void BrowserChildProcessCrashed(
const content::ChildProcessData& data,
const content::ChildProcessTerminationInfo& info) override;
void BrowserChildProcessKilled(
const content::ChildProcessData& data,
const content::ChildProcessTerminationInfo& info) override;
void TrackedProcessExited(BrowserChildProcessHostId id, int exit_code);
static void OnProcessLaunched(const base::Process& process,
const std::string& metrics_name,
ProcessNodeImpl* process_node);
std::unique_ptr<ProcessNodeImpl> browser_process_node_;
// This map keeps track of all GPU and Utility processes by their unique ID
// from |content::ChildProcessData|. Apparently more than one GPU process can
// be existent at a time, though secondaries are very transient.
base::flat_map<BrowserChildProcessHostId, std::unique_ptr<ProcessNodeImpl>>
tracked_process_nodes_;
};
} // namespace performance_manager
#endif // COMPONENTS_PERFORMANCE_MANAGER_BROWSER_CHILD_PROCESS_WATCHER_H_
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