SCA、JBI之比較

SCA最早是由IBM、BEA、Oracle、SAP四大家發(fā)起的規(guī)范，現(xiàn)在已經(jīng)有18家成員加入了此規(guī)范，包括SUN; JBI是由SUN主導(dǎo)的規(guī)范;區(qū)別如下（偶在國外的一個論壇上摘來的，就不翻譯了，還是原汁原味的好） ：

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1. Supporters of SCA view JBI as a Java Platform standard that can be helpful in implementing SCA on the Java platform.
2. Supporters of JBI view SCA as providing additional service metadata that can help simplify and standardize service composition within the Java Platform and between the Java Platform and other platforms.
3. Both SCA and JBI are focused on helping developers construct and compose services so it is natural to assume that they are competitors; however, this is not the case. While both can be used separately, they are also effective to use together because they focus on different aspects of the larger service composition problem.
4. The reason this is possible is that SCA and JBI target different audiences. The SCA specifications target end users. They describe how to implement, assemble and deploy applications composed from services. As such, the target audience for these specifications is people working in the roles of developer, assembler and deployer respectively. 
5. SCA allows multiple technologies to be used to implement services (e.g. Java, BPEL, C++) and multiple bindings for communicating with services (e.g. Web services or JMS). However, SCA does not describe how you would introduce a new implementation type or new binding into a runtime. This is exactly where JBI is targeted.
6. JBI is a Java Platform integration 'micro kernel' standard that provides an open architecture in support of multi-vendor Java Composite Application Platform tools and infrastructure. It defines a set of service provider interfaces for middleware providers to implement if they want to install new service engines (which correspond to SCA's implementation types) or binding components (which correspond to SCA's bindings) into a JBI-compliant runtime.[@more@]
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