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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_EXTENSIONS_EXTENSION_MESSAGE_SERVICE_H_
#define CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_SERVICE_H_
#include <map>
#include <string>
class ExtensionView;
class ResourceMessageFilter;
// This class manages message passing to and from extension processes. It
// maintains a list of available extensions, as well as a set of open channels.
// It should only be accessed on the IO thread, with the exception of
// RegisterExtensionView().
//
// Terminology:
// channel: connection between two ports (one of which belongs to an extension)
// port: an IPC::Message::Sender interface through which we communicate to a
// process. We use MessageFilters for this since that allows us to send our
// messages on the IO thread.
class ExtensionMessageService {
public:
static ExtensionMessageService* GetInstance();
ExtensionMessageService();
// Registers an extension so that it can be referenced by its ID. This method
// should only be used by the UI thread.
void RegisterExtensionView(ExtensionView* view);
// Given an extension's ID, opens a channel between the given renderer "port"
// and that extension. Returns a channel ID to be used for posting messages
// between the processes, or -1 if the extension doesn't exist.
int OpenChannelToExtension(const std::string& extension_id,
ResourceMessageFilter* renderer_port);
// Sends a message to the extension via the given channel.
void PostMessageToExtension(int channel_id, const std::string& message);
// Called to let us know that a renderer is going away.
void RendererShutdown(ResourceMessageFilter* renderer_port);
private:
class ExtensionFilter;
friend class ExtensionFilter;
// Called when our ExtensionFilter is ready/going away.
void OnExtensionRegistered(ExtensionFilter* extension);
void OnExtensionUnregistered(ExtensionFilter* extension);
// A map of extension ID to the extension port to communicate through.
// TODO(mpcomplete): Handle the case where there's multiple ExtensionViews
// in a given extension.
typedef std::map<std::string, ExtensionFilter*> ExtensionMap;
ExtensionMap extensions_;
// The connection between the renderer and extension.
struct MessageChannel {
ExtensionFilter* extension_port;
ResourceMessageFilter* renderer_port;
};
// A map of channel ID to its channel object.
typedef std::map<int, MessageChannel> MessageChannelMap;
MessageChannelMap channels_;
// For generating unique channel IDs.
int next_channel_id_;
};
#endif // CHROME_BROWSER_EXTENSIONS_EXTENSION_MESSAGE_SERVICE_H_
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