RDDProcessManager.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _include_dom_media_ipc_RDDProcessManager_h_

#define _include_dom_media_ipc_RDDProcessManager_h_

#include "mozilla/MozPromise.h"

#include "mozilla/PRemoteDecoderManagerChild.h"

#include "mozilla/RDDProcessHost.h"

#include "mozilla/dom/ipc/IdType.h"

#include "mozilla/ipc/TaskFactory.h"

#include "mozilla/PRDDChild.h"

#include "nsIObserver.h"

namespace mozilla {

class MemoryReportingProcess;

class RDDChild;

// The RDDProcessManager is a singleton responsible for creating RDD-bound

// objects that may live in another process. Currently, it provides access

// to the RDD process via ContentParent.

class RDDProcessManager final : public RDDProcessHost::Listener {

  friend class RDDChild;

 public:

  static void Initialize();

  static void RDDProcessShutdown();

  static void Shutdown();

  static RDDProcessManager* Get();

  ~RDDProcessManager();

  using EnsureRDDPromise =

      MozPromise<ipc::Endpoint<PRemoteDecoderManagerChild>, nsresult, true>;

  // Launch a new RDD process asynchronously

  RefPtr<GenericNonExclusivePromise> LaunchRDDProcess();

  // If not using a RDD process, launch a new RDD process asynchronously and

  // create a RemoteDecoderManager bridge

  RefPtr<EnsureRDDPromise> EnsureRDDProcessAndCreateBridge(

      base::ProcessId aOtherProcess, dom::ContentParentId aParentId);

  void OnProcessUnexpectedShutdown(RDDProcessHost* aHost) override;

  // Notify the RDDProcessManager that a top-level PRDD protocol has been

  // terminated. This may be called from any thread.

  void NotifyRemoteActorDestroyed(const uint64_t& aProcessToken);

  // Returns -1 if there is no RDD process, or the platform pid for it.

  base::ProcessId RDDProcessPid();

  // If a RDD process is present, create a MemoryReportingProcess object.

  // Otherwise, return null.

  RefPtr<MemoryReportingProcess> GetProcessMemoryReporter();

  // Returns access to the PRDD protocol if a RDD process is present.

  RDDChild* GetRDDChild() { return mRDDChild; }

  // Returns whether or not a RDD process was ever launched.

  bool AttemptedRDDProcess() const { return mNumProcessAttempts > 0; }

  // Returns the RDD Process

  RDDProcessHost* Process() { return mProcess; }

/*

   * ** Test-only Method **

   * Trigger RDD-process test metric instrumentation.

*/

  RefPtr<PRDDChild::TestTriggerMetricsPromise> TestTriggerMetrics();

 private:

  bool IsRDDProcessLaunching();

  bool IsRDDProcessDestroyed() const;

  bool CreateVideoBridge();

  // Called from our xpcom-shutdown observer.

  void OnXPCOMShutdown();

  void OnPreferenceChange(const char16_t* aData);

  RDDProcessManager();

  // Shutdown the RDD process.

  void DestroyProcess();

  bool IsShutdown() const;

  DISALLOW_COPY_AND_ASSIGN(RDDProcessManager);

  class Observer final : public nsIObserver {

   public:

    NS_DECL_ISUPPORTS

    NS_DECL_NSIOBSERVER

    explicit Observer(RDDProcessManager* aManager);

   protected:

    ~Observer() = default;

    RDDProcessManager* mManager;

};

  friend class Observer;

  bool CreateContentBridge(

      base::ProcessId aOtherProcess, dom::ContentParentId aParentId,

      ipc::Endpoint<PRemoteDecoderManagerChild>* aOutRemoteDecoderManager);

  const RefPtr<Observer> mObserver;

  ipc::TaskFactory<RDDProcessManager> mTaskFactory;

  uint32_t mNumProcessAttempts = 0;

  uint32_t mNumUnexpectedCrashes = 0;

  // Fields that are associated with the current RDD process.

  RDDProcessHost* mProcess = nullptr;

  uint64_t mProcessToken = 0;

  RDDChild* mRDDChild = nullptr;

  // Collects any pref changes that occur during process launch (after

  // the initial map is passed in command-line arguments) to be sent

  // when the process can receive IPC messages.

  nsTArray<dom::Pref> mQueuedPrefs;

  // Promise will be resolved when the RDD process has been fully started and

  // VideoBridge configured. Only accessed on the main thread.

  RefPtr<GenericNonExclusivePromise> mLaunchRDDPromise;

};

}  // namespace mozilla

#endif  // _include_dom_media_ipc_RDDProcessManager_h_