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・ Message from the King
・ Message Handling System
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・ Message in a Bottle (song)
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Message oriented middleware
・ Message Oriented Text Interchange Systems
・ Message Parsing Interpreter
・ Message passing
・ Message passing (disambiguation)
・ Message passing in computer clusters
・ Message Passing Interface
・ Message picture
・ Message posting protocol
・ Message precedence
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・ Message queuing service
・ Message Received
・ Message send protocol
・ Message sequence chart


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Message oriented middleware : ウィキペディア英語版
Message oriented middleware

Message oriented middleware (MOM) is software or hardware infrastructure supporting the sending and receiving of messages between distributed systems. Because businesses, institutions, and technologies change continually, the software systems that serve them must be able to accommodate such changes. Following a merger, the addition of a service, or the expansion of available services, a business can ill afford to recreate its information systems. It is at this most critical point that it needs to integrate new components or to scale existing ones as efficiently as possible. The easiest way to integrate heterogeneous components is not to recreate them as homogeneous elements but to provide a layer that allows them to communicate despite their differences. This layer, called middleware, allows software components (applications, enterprise java beans, servlets, and other components) that have been developed independently and that run on different networked platforms to interact with one another. It is when this interaction is possible that the network can become the computer.
Applications distributed on different network nodes use the application interface to communicate without having to be concerned with the details of the operating environments that host other applications nor with the services that connect them to these applications. In addition, by providing an administrative interface, this new, virtual system of interconnected applications can be made reliable and secure. Its performance can be measured and tuned, and it can be scaled without losing function.〔()〕
==Middleware categories==

*Remote Procedure Call or RPC-based middleware
*Object Request Broker or ORB-based middleware
*Message Oriented Middleware or MOM-based middleware
All these models make it possible for one software component to affect the behavior of another component over a network. They are different in that RPC- and ORB-based middleware create systems of tightly coupled components, whereas MOM-based systems allow for a looser coupling of components. In an RPC- or ORB-based system, when one procedure calls another, it must wait for the called procedure to return before it can do anything else. In these synchronous messaging models, the middleware functions partly as a super-linker, locating the called procedure on a network and using network services to pass function or method parameters to the procedure and then to return results.〔()〕

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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