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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_MESSAGE_PORT_DISPATCHER_H_
#define CHROME_BROWSER_WORKER_HOST_MESSAGE_PORT_DISPATCHER_H_
#include <map>
#include <utility>
#include <vector>
#include "base/basictypes.h"
#include "base/singleton.h"
#include "base/string16.h"
#include "base/task.h"
#include "chrome/common/notification_registrar.h"
#include "ipc/ipc_message.h"
class MessagePortDispatcher : public NotificationObserver {
public:
typedef std::vector<std::pair<string16, std::vector<int> > > QueuedMessages;
// Returns the MessagePortDispatcher singleton.
static MessagePortDispatcher* GetInstance();
bool OnMessageReceived(const IPC::Message& message,
IPC::Message::Sender* sender,
CallbackWithReturnValue<int>::Type* next_routing_id,
bool* message_was_ok);
// Updates the information needed to reach a message port when it's sent to a
// (possibly different) process.
void UpdateMessagePort(
int message_port_id,
IPC::Message::Sender* sender,
int routing_id,
CallbackWithReturnValue<int>::Type* next_routing_id);
// Attempts to send the queued messages for a message port.
void SendQueuedMessagesIfPossible(int message_port_id);
bool Send(IPC::Message* message);
private:
friend struct DefaultSingletonTraits<MessagePortDispatcher>;
MessagePortDispatcher();
~MessagePortDispatcher();
// Message handlers.
void OnCreate(int* route_id, int* message_port_id);
void OnDestroy(int message_port_id);
void OnEntangle(int local_message_port_id, int remote_message_port_id);
void OnPostMessage(int sender_message_port_id,
const string16& message,
const std::vector<int>& sent_message_port_ids);
void OnQueueMessages(int message_port_id);
void OnSendQueuedMessages(int message_port_id,
const QueuedMessages& queued_messages);
void PostMessageTo(int message_port_id,
const string16& message,
const std::vector<int>& sent_message_port_ids);
// NotificationObserver interface.
void Observe(NotificationType type,
const NotificationSource& source,
const NotificationDetails& details);
// Handles the details of removing a message port id. Before calling this,
// verify that the message port id exists.
void Erase(int message_port_id);
#ifdef NDEBUG
bool CheckMessagePortMap(bool check_entanglements) { return true; }
#else
bool CheckMessagePortMap(bool check_entanglements);
#endif
struct MessagePort {
// sender and route_id are what we need to send messages to the port.
IPC::Message::Sender* sender;
int route_id;
// A function pointer to generate a new route id for the sender above.
// Owned by "sender" above, so don't delete.
CallbackWithReturnValue<int>::Type* next_routing_id;
// A globally unique id for this message port.
int message_port_id;
// The globally unique id of the entangled message port.
int entangled_message_port_id;
// If true, all messages to this message port are queued and not delivered.
bool queue_messages;
QueuedMessages queued_messages;
};
typedef std::map<int, MessagePort> MessagePorts;
MessagePorts message_ports_;
// We need globally unique identifiers for each message port.
int next_message_port_id_;
// Valid only during IPC message dispatching.
IPC::Message::Sender* sender_;
CallbackWithReturnValue<int>::Type* next_routing_id_;
NotificationRegistrar registrar_;
DISALLOW_COPY_AND_ASSIGN(MessagePortDispatcher);
};
#endif // CHROME_BROWSER_WORKER_HOST_MESSAGE_PORT_DISPATCHER_H_
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