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文件名称:Designing, Building And Deploying Messaging Solutions
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更新时间:2016-10-12 05:13:13
Martin Fowler Messaging Solutions Integration
Interesting applications rarely live in isolation. Whether your sales application must interface
with your inventory application, your procurement application must connect to an auction site,
or your PDA’s PIM must synchronize with the corporate calendar server, it seems like any
application can be made better by integrating it with other applications.
All integration solutions have to deal with a few fundamental challenges:
• Networks are unreliable. Integration solutions have to transport data from one computer to
another across networks. Compared to a process running on a single computer,
distributed computing has to be prepared to deal with a much larger set of possible
problems. Often times, two systems to be integrated are separated by continents and data
between them has to travel through phone-lines, LAN segments, routers, switches, public
networks, and satellite links. Each of these steps can cause delays or interruptions.
• Networks are slow. Sending data across a network is multiple orders of magnitude slower
than making a local method call. Designing a widely distributed solution the same way
you would approach a single application could have disastrous performance
implications.
• Any two applications are different. Integration solutions need to transmit information
between systems that use different programming languages, operating platforms, and
data formats. An integration solution needs to be able to interface with all these different
technologies.
• Change is inevitable. Applications change over time. An integration solution has to keep
pace with changes in the applications it connects. Integration solutions can easily get
caught in an avalanche effect of changes – if one system changes, all other systems may
be affected. An integration solution needs to minimize the dependencies from one system
to another by using loose coupling between applications.