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// Copyright (c) 2009 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 CHROME_BROWSER_WORKER_HOST_WORKER_SERVICE_H_
#define CHROME_BROWSER_WORKER_HOST_WORKER_SERVICE_H_
#include <list>
#include "base/basictypes.h"
#include "base/singleton.h"
#include "chrome/browser/worker_host/worker_process_host.h"
#include "chrome/common/notification_registrar.h"
#include "googleurl/src/gurl.h"
#include "ipc/ipc_message.h"
class WorkerProcessHost;
class ResourceDispatcherHost;
class WorkerService : public NotificationObserver {
public:
// Returns the WorkerService singleton.
static WorkerService* GetInstance();
// Initialize the WorkerService. OK to be called multiple times.
void Initialize(ResourceDispatcherHost* rdh);
// Creates a dedicated worker. Returns true on success.
bool CreateWorker(const GURL &url,
bool is_shared,
const string16& name,
int renderer_pid,
int render_view_route_id,
IPC::Message::Sender* sender,
int sender_id,
int sender_route_id);
// Cancel creation of a dedicated worker that hasn't started yet.
void CancelCreateDedicatedWorker(int sender_id, int sender_route_id);
// Called by the worker creator when a message arrives that should be
// forwarded to the worker process.
void ForwardMessage(const IPC::Message& message, int sender_id);
int next_worker_route_id() { return ++next_worker_route_id_; }
// 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.
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();
// 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);
// NotificationObserver interface.
void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
// Notifies us that a process that's talking to a worker has shut down.
void SenderShutdown(IPC::Message::Sender* sender);
// Notifies us that a worker process has closed.
void WorkerProcessDestroyed(WorkerProcessHost* process);
NotificationRegistrar registrar_;
int next_worker_route_id_;
ResourceDispatcherHost* resource_dispatcher_host_;
WorkerProcessHost::Instances queued_workers_;
DISALLOW_COPY_AND_ASSIGN(WorkerService);
};
#endif // CHROME_BROWSER_WORKER_HOST_WORKER_SERVICE_H_
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