1 files changed, 108 insertions, 0 deletions
diff --git a/src/mongo/util/net/message_port.h b/src/mongo/util/net/message_port.h
new file mode 100644
index 00000000000..5d404d84f8a
--- /dev/null
+++ b/src/mongo/util/net/message_port.h
@@ -0,0 +1,108 @@
+// 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