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Peer-to-peer messaging systemPeer-to-peer messaging system description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20080250110, Peer-to-peer messaging system. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to computer networks and, more particularly, to peer-to-peer messaging systems. BACKGROUND OF THE INVENTIONDistributed network applications often require an efficient and reliable real-time data communication system. Applications need to send and receive messages to other applications running on separate computers linked by a local area network. Such a messaging system should be able to handle a high volume of messages. Various systems and techniques have been previously developed for data communication for distributed network applications. One such previously developed system is a “heavyweight” peer-to-peer messaging system. The heavyweight peer-to-peer messaging system employs two types of components. The first type of component is a messaging client library that is linked into every custom application that needs to send or receive messages. The second type of component is a messaging daemon that handles the network broadcasting of the messages. This messaging daemon needs to be running on every machine that is sending or receiving messages. Such daemon is a process that runs in the background (without a visible user interface) and performs a specified operation at predefined times or in response to certain events. In general, daemons are usually spawned automatically by a system and may either live forever or be regenerated at intervals. Another previously developed messaging system employs a client-server architecture. Such a client-server system consists of multiple messaging clients communicating with one or more stand-alone messaging servers. The clients have messaging libraries linked into custom applications like in the peer-to-peer system described above. Each messaging server has a daemon resident thereon. Both the heavyweight peer-to-peer and client-server messaging architectures suffer from numerous problems. For example, in the heavyweight peer-to-peer model, inter-process communication (IPC) calls between the messaging library and the messaging daemon are required for messaging, thereby comprising performance. This is in addition to the required network communication that is needed to broadcast the messages from a sending messaging daemon to one or more receiving messaging daemons. In the client-server model, performance is compromised because messages need to be sent to a messaging server before being broadcast to the receiving client machines. In the heavyweight peer-to-peer model, reliability is an issued because the messaging daemon could be a potential failure point on every machine that needs to send and receive messages. If the messaging daemon fails or is accidentally stopped, none of the applications running on the machine will be able to send or receive messages. In the client-server model, the use of a single messaging server presents a single point of failure. Using one or more additional messaging servers alleviates this reliability issue, but increases overall costs. In the heavyweight peer-to-peer model, a messaging daemon must be configured and initiated for each machine that is sending and receiving messages, thereby complicating the task of system configuration. In the client-server model, system configuration is complicated by the need to configure and maintain the messaging server machines and the daemons resident thereon. In addition, many previously developed messaging solutions use the Transmission Control Protocol (TCP). TCP provides a unicast point-to-point transmission mechanism with message acknowledgement for reliable messaging. TCP is suitable when there is one sender and one recipient for any given message. However, to send a message from one machine to many others using the unicast mechanism is bandwidth intensive. For example, to send a message to five recipients with the unicast mechanism of TCP requires five separate transmissions of the same data. SUMMARY OF THE INVENTIONThe present invention provides systems and methods for a lightweight peer-to-peer messaging system. The messaging system does not use a messaging daemon in order for there to be communication between a plurality of client machines. Each client machine in the messaging system includes one or more applications, each of which has a messaging client library for communications with other machines. The messaging client library may implement a User Datagram Protocol (UDP) multicast protocol for sending out broadcast messages. If there are problems, then the same machine may send out a non-broadcast UDP protocol message. The proposed lightweight peer-to-peer messaging system includes a client application messaging library. The system does not include a separate messaging daemon or stand-alone messaging server. The simplicity of design improves upon reliability, performance, and configuration ease. According to one embodiment of the present invention, a system is provided for peer-to-peer messaging. The system includes a first client machine which may transmit a sequence of messages related to a subject. The transmission of each message can be in the form of multicast delivery or reliable unicast delivery. At least one second client machine communicates with the first client machine. Each such second client machine may receive at least a portion of the sequence of messages transmitted in the multicast form of delivery from the first client machine, and determines if there is an interest in the subject of the sequence of messages. The second client machine may determine if any messages in the sequence have not been received if there is an interest, and can transmit a request for re-transmission to the first client machine. The request identifies any messages of the sequence that were not received so that such messages can be re-transmitted by the first client machine to the at least one second client machine in the form of reliable unicast delivery. According to another embodiment of the present invention, a method is provided for peer-to-peer messaging performed on a first client machine. The method includes the following: transmitting a sequence of messages in multicast form of delivery to a plurality of second client machines, the sequence of messages related to a subject, and wherein at least a portion of the plurality of second client machines subscribe to the subject; receiving a request for re-transmission from at least one second client machine, the request for re-transmission specifying at least one message of the sequence which was not received by the at least one second client machine; and re-transmitting the specified at least one message of the sequence in reliable unicast form of delivery to the at least one second client machine. Important technical advantages of the present invention are readily apparent to one skilled in the art from the following figures, descriptions, and claims. BRIEF DESCRIPTION OF THE DRAWINGSFor a more complete understanding of the present invention, for further features and advantages, applicants now make the following description, taken in conjunction with the accompanying drawings, in which: FIG. 1 illustrates a peer-to-peer messaging system, according to an embodiment of the present invention. FIG. 2 illustrates a logical view of an exemplary computer system environment in which a lightweight peer-to-peer messaging system can be employed, according to an embodiment of the present invention. FIG. 3 illustrates an exemplary messaging library, according to an embodiment of the present invention. Continue reading about Peer-to-peer messaging system... Full patent description for Peer-to-peer messaging system Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Peer-to-peer messaging system patent application. 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