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content / public / browser / synthetic_trial_syncer.h [blame]
// Copyright 2023 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_PUBLIC_BROWSER_SYNTHETIC_TRIAL_SYNCER_H_
#define CONTENT_PUBLIC_BROWSER_SYNTHETIC_TRIAL_SYNCER_H_
#include "base/containers/flat_map.h"
#include "base/memory/raw_ptr.h"
#include "components/variations/synthetic_trials.h"
#include "content/common/content_export.h"
#include "content/public/browser/browser_child_process_observer.h"
#include "content/public/browser/render_process_host_creation_observer.h"
#include "content/public/browser/render_process_host_observer.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace variations {
class SyntheticTrialRegistry;
} // namespace variations
namespace content {
namespace mojom {
class SyntheticTrialConfiguration;
} // namespace mojom
// This class is used by the browser process to tell child processes
// what synthetic trial groups the browser process joins in.
//
// This class registers itself as an observer of SyntheticTrialObserver.
// SyntheticTrialRegistry notifies this class when a synthetic trial group
// is updated.
//
// This class also registers itself as BrowserChildProcessObserver,
// RenderProcessHostCreationObserver and RenderProcessHostObserver to
// tell the synthetic trial groups just after a child process is created.
// At that time, this class gets all joined synthetic groups by calling
// SyntheticTrialRegistry::GetSyntheticTrialGroups().
class CONTENT_EXPORT SyntheticTrialSyncer
: public variations::SyntheticTrialObserver,
public BrowserChildProcessObserver,
public RenderProcessHostCreationObserver,
public RenderProcessHostObserver {
public:
static std::unique_ptr<SyntheticTrialSyncer> Create(
variations::SyntheticTrialRegistry* registry);
explicit SyntheticTrialSyncer(variations::SyntheticTrialRegistry* registry);
~SyntheticTrialSyncer() override;
SyntheticTrialSyncer(const SyntheticTrialSyncer&) = delete;
SyntheticTrialSyncer(SyntheticTrialSyncer&&) = delete;
SyntheticTrialSyncer& operator=(const SyntheticTrialSyncer&) = delete;
private:
void OnDisconnected(int unique_child_process_id);
// variations::SyntheticTrialObserver:
void OnSyntheticTrialsChanged(
const std::vector<variations::SyntheticTrialGroup>& trials_updated,
const std::vector<variations::SyntheticTrialGroup>& trials_removed,
const std::vector<variations::SyntheticTrialGroup>& groups) override;
// BrowserChildProcessObserver:
void BrowserChildProcessLaunchedAndConnected(
const ChildProcessData& data) override;
void BrowserChildProcessHostDisconnected(
const ChildProcessData& data) override;
// RenderProcessHostCreationObserver:
void OnRenderProcessHostCreated(RenderProcessHost* host) override;
// RenderProcessHostObserver:
void RenderProcessReady(RenderProcessHost* host) override;
void RenderProcessHostDestroyed(RenderProcessHost* host) override;
void RenderProcessExited(RenderProcessHost* host,
const ChildProcessTerminationInfo& info) override;
const raw_ptr<variations::SyntheticTrialRegistry> registry_;
// A map: child process' unique id to the mojo connection.
// The keys are unique id-s created by
// ChildProcessHostImpl::GenerateChildProcessUniqueId().
//
// Since the number of child precesses is basically not large, use
// base::flat_map for the map.
base::flat_map<int, mojo::Remote<mojom::SyntheticTrialConfiguration>>
child_process_unique_id_to_mojo_connections_;
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_SYNTHETIC_TRIAL_SYNCER_H_