Create an API around WorkerService that chrome consumes. Rename the existing WorkerService to Wor...

content/browser/worker_host/worker_service.h

-// Copyright (c) 2011 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 CONTENT_BROWSER_WORKER_HOST_WORKER_SERVICE_H_
-#define CONTENT_BROWSER_WORKER_HOST_WORKER_SERVICE_H_
-#pragma once
-
-#include "base/basictypes.h"
-#include "base/memory/singleton.h"
-#include "base/observer_list.h"
-#include "base/threading/non_thread_safe.h"
-#include "content/browser/worker_host/worker_process_host.h"
-#include "content/common/content_export.h"
-#include "content/public/browser/notification_registrar.h"
-#include "googleurl/src/gurl.h"
-
-struct ViewHostMsg_CreateWorker_Params;
-class WorkerServiceObserver;
-
-namespace content {
-class ResourceContext;
-}  // namespace content
-
-// A singleton for managing HTML5 web workers.
-class CONTENT_EXPORT WorkerService {
- public:
-  // Returns the WorkerService singleton.
-  static WorkerService* GetInstance();
-
-  // These methods correspond to worker related IPCs.
-  void CreateWorker(const ViewHostMsg_CreateWorker_Params& params,
-                    int route_id,
-                    WorkerMessageFilter* filter,
-                    const content::ResourceContext& resource_context);
-  void LookupSharedWorker(const ViewHostMsg_CreateWorker_Params& params,
-                          int route_id,
-                          WorkerMessageFilter* filter,
-                          const content::ResourceContext* resource_context,
-                          bool* exists,
-                          bool* url_error);
-  void CancelCreateDedicatedWorker(int route_id, WorkerMessageFilter* filter);
-  void ForwardToWorker(const IPC::Message& message,
-                       WorkerMessageFilter* filter);
-  void DocumentDetached(unsigned long long document_id,
-                        WorkerMessageFilter* filter);
-
-  void OnWorkerMessageFilterClosing(WorkerMessageFilter* filter);
-
-  int next_worker_route_id() { return ++next_worker_route_id_; }
-
-  // Given a worker's process id, return the IDs of the renderer process and
-  // render view that created it.  For shared workers, this returns the first
-  // parent.
-  // TODO(dimich): This code assumes there is 1 worker per worker process, which
-  // is how it is today until V8 can run in separate threads.
-  bool GetRendererForWorker(int worker_process_id,
-                            int* render_process_id,
-                            int* render_view_id) const;
-  const WorkerProcessHost::WorkerInstance* FindWorkerInstance(
-      int worker_process_id);
-
-  void AddObserver(WorkerServiceObserver* observer);
-  void RemoveObserver(WorkerServiceObserver* observer);
-
-  void NotifyWorkerDestroyed(
-      WorkerProcessHost* process,
-      int worker_route_id);
-  void NotifyWorkerContextStarted(
-      WorkerProcessHost* process,
-      int worker_route_id);
-
-  // Used when multiple workers can run in the same process.
-  static const int kMaxWorkerProcessesWhenSharing;
-
-  // Used when we run each worker in a separate process.
-  static const int kMaxWorkersWhenSeparate;
-  static const int kMaxWorkersPerTabWhenSeparate;
-
- private:
-  friend struct DefaultSingletonTraits<WorkerService>;
-
-  WorkerService();
-  ~WorkerService();
-
-  // Given a WorkerInstance, create an associated worker process.
-  bool CreateWorkerFromInstance(WorkerProcessHost::WorkerInstance instance);
-
-  // Returns a WorkerProcessHost object if one exists for the given domain, or
-  // NULL if there are no such workers yet.
-  WorkerProcessHost* GetProcessForDomain(const GURL& url);
-
-  // Returns a WorkerProcessHost based on a strategy of creating one worker per
-  // core.
-  WorkerProcessHost* GetProcessToFillUpCores();
-
-  // Returns the WorkerProcessHost from the existing set that has the least
-  // number of worker instance running.
-  WorkerProcessHost* GetLeastLoadedWorker();
-
-  // Checks if we can create a worker process based on the process limit when
-  // we're using a strategy of one process per core.
-  bool CanCreateWorkerProcess(
-      const WorkerProcessHost::WorkerInstance& instance);
-
-  // Checks if the tab associated with the passed RenderView can create a
-  // worker process based on the process limit when we're using a strategy of
-  // one worker per process.
-  bool TabCanCreateWorkerProcess(
-      int render_process_id, int render_route_id, bool* hit_total_worker_limit);
-
-  // Tries to see if any of the queued workers can be created.
-  void TryStartingQueuedWorker();
-
-  // APIs for manipulating our set of pending shared worker instances.
-  WorkerProcessHost::WorkerInstance* CreatePendingInstance(
-      const GURL& url,
-      const string16& name,
-      const content::ResourceContext* resource_context);
-  WorkerProcessHost::WorkerInstance* FindPendingInstance(
-      const GURL& url,
-      const string16& name,
-      const content::ResourceContext* resource_context);
-  void RemovePendingInstances(
-      const GURL& url,
-      const string16& name,
-      const content::ResourceContext* resource_context);
-
-  WorkerProcessHost::WorkerInstance* FindSharedWorkerInstance(
-      const GURL& url,
-      const string16& name,
-      const content::ResourceContext* resource_context);
-
-  content::NotificationRegistrar registrar_;
-  int next_worker_route_id_;
-
-  WorkerProcessHost::Instances queued_workers_;
-
-  // These are shared workers that have been looked up, but not created yet.
-  // We need to keep a list of these to synchronously detect shared worker
-  // URL mismatches when two pages launch shared workers simultaneously.
-  WorkerProcessHost::Instances pending_shared_workers_;
-
-  ObserverList<WorkerServiceObserver> observers_;
-
-  DISALLOW_COPY_AND_ASSIGN(WorkerService);
-};
-
-#endif  // CONTENT_BROWSER_WORKER_HOST_WORKER_SERVICE_H_