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// 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/threading/non_thread_safe.h"
#include "content/browser/worker_host/worker_process_host.h"
#include "content/common/notification_registrar.h"
#include "googleurl/src/gurl.h"
namespace content {
class ResourceContext;
} // namespace content
namespace net {
class URLRequestContextGetter;
} // namespace net
struct ViewHostMsg_CreateWorker_Params;
// A singleton for managing HTML5 web workers.
class 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);
// 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);
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_;
DISALLOW_COPY_AND_ASSIGN(WorkerService);
};
#endif // CONTENT_BROWSER_WORKER_HOST_WORKER_SERVICE_H_
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