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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_RENDERER_WEBWORKER_BASE_H_
#define CHROME_RENDERER_WEBWORKER_BASE_H_
#pragma once
#include <vector>
#include "base/basictypes.h"
#include "ipc/ipc_channel.h"
class ChildThread;
class GURL;
// WebWorkerBase is the common base class used by both WebWorkerProxy and
// WebSharedWorker. It contains logic to support starting up both dedicated
// and shared workers, and handling message queueing while waiting for the
// worker process to start.
class WebWorkerBase : public IPC::Channel::Listener {
public:
virtual ~WebWorkerBase();
// Creates and initializes a new dedicated worker context.
void CreateDedicatedWorkerContext(const GURL& script_url,
const string16& user_agent,
const string16& source_code) {
CreateWorkerContext(script_url, false, string16(), user_agent,
source_code, MSG_ROUTING_NONE, 0);
}
// Creates and initializes a new shared worker context.
void CreateSharedWorkerContext(const GURL& script_url,
const string16& name,
const string16& user_agent,
const string16& source_code,
int pending_route_id,
int64 script_resource_appcache_id) {
CreateWorkerContext(script_url, true, name, user_agent,
source_code, pending_route_id,
script_resource_appcache_id);
}
// Returns true if the worker is running (can send messages to it).
bool IsStarted();
// Disconnects the worker (stops listening for incoming messages).
void Disconnect();
// Sends a message to the worker thread (forwarded via the RenderViewHost).
// If WorkerStarted() has not yet been called, message is queued.
bool Send(IPC::Message*);
// Returns true if there are queued messages.
bool HasQueuedMessages() { return queued_messages_.size() != 0; }
// Sends any messages currently in the queue.
void SendQueuedMessages();
protected:
WebWorkerBase(ChildThread* child_thread,
unsigned long long document_id,
int route_id,
int render_view_route_id,
int parent_appcache_host_id);
// Routing id associated with this worker - used to receive messages from the
// worker, and also to route messages to the worker (WorkerService contains
// a map that maps between these renderer-side route IDs and worker-side
// routing ids).
int route_id_;
// The routing id for the RenderView that created this worker.
int render_view_route_id_;
ChildThread* child_thread_;
private:
void CreateWorkerContext(const GURL& script_url,
bool is_shared,
const string16& name,
const string16& user_agent,
const string16& source_code,
int pending_route_id,
int64 script_resource_appcache_id);
// ID of our parent document (used to shutdown workers when the parent
// document is detached).
unsigned long long document_id_;
// ID of our parent's appcache host, only valid for dedicated workers.
int parent_appcache_host_id_;
// Stores messages that were sent before the StartWorkerContext message.
std::vector<IPC::Message*> queued_messages_;
};
#endif // CHROME_RENDERER_WEBWORKER_BASE_H_
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