Initial pass of shared workers renderer-side code

chrome/renderer/webworker_base.h

+// 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_
+
+#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:
+  WebWorkerBase(ChildThread* child_thread,
+                int route_id,
+                int render_view_route_id);
+
+  virtual ~WebWorkerBase();
+
+  // Creates and initializes a new worker context.
+  void CreateWorkerContext(IPC::Message* create_message,
+                           const GURL& script_url,
+                           const string16& user_agent,
+                           const string16& source_code);
+
+  // Returns true if the worker is running (can send messages to it).
+  bool IsStarted();
+
+  // Disconnects the worker (stops listening for incoming messages).
+  virtual 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*);
+
+  // Sends any messages currently in the queue.
+  void SendQueuedMessages();
+
+ protected:
+  // 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:
+  // Stores messages that were sent before the StartWorkerContext message.
+  std::vector<IPC::Message*> queued_messages_;
+};
+
+#endif  // CHROME_RENDERER_WEBWORKER_BASE_H_