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// message_port.h
/* Copyright 2009 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include "sock.h"
#include "message.h"
namespace mongo {
class MessagingPort;
class PiggyBackData;
typedef AtomicUInt MSGID;
class AbstractMessagingPort : boost::noncopyable {
public:
AbstractMessagingPort() : tag(0) {}
virtual ~AbstractMessagingPort() { }
virtual void reply(Message& received, Message& response, MSGID responseTo) = 0; // like the reply below, but doesn't rely on received.data still being available
virtual void reply(Message& received, Message& response) = 0;
virtual HostAndPort remote() const = 0;
virtual unsigned remotePort() const = 0;
virtual void assertStillConnected() = 0;
public:
// TODO make this private with some helpers
/* ports can be tagged with various classes. see closeAllSockets(tag). defaults to 0. */
unsigned tag;
};
class MessagingPort : public AbstractMessagingPort , public Socket {
public:
MessagingPort(int fd, const SockAddr& remote);
// in some cases the timeout will actually be 2x this value - eg we do a partial send,
// then the timeout fires, then we try to send again, then the timeout fires again with
// no data sent, then we detect that the other side is down
MessagingPort(double so_timeout = 0, int logLevel = 0 );
MessagingPort(Socket& socket);
virtual ~MessagingPort();
void shutdown();
/* it's assumed if you reuse a message object, that it doesn't cross MessagingPort's.
also, the Message data will go out of scope on the subsequent recv call.
*/
bool recv(Message& m);
void reply(Message& received, Message& response, MSGID responseTo);
void reply(Message& received, Message& response);
bool call(Message& toSend, Message& response);
void say(Message& toSend, int responseTo = -1);
/**
* this is used for doing 'async' queries
* instead of doing call( to , from )
* you would do
* say( to )
* recv( from )
* Note: if you fail to call recv and someone else uses this port,
* horrible things will happend
*/
bool recv( const Message& sent , Message& response );
void piggyBack( Message& toSend , int responseTo = -1 );
unsigned remotePort() const { return Socket::remotePort(); }
virtual HostAndPort remote() const;
void assertStillConnected();
private:
PiggyBackData * piggyBackData;
// this is the parsed version of remote
// mutable because its initialized only on call to remote()
mutable HostAndPort _remoteParsed;
public:
static void closeAllSockets(unsigned tagMask = 0xffffffff);
friend class PiggyBackData;
};
} // namespace mongo
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