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How do 'services' and 'objects' differ?

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QUESTION POSED ON: 21 March 2005
How do 'services' and 'objects' differ?

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Depending on how loose you are with your definitions, service and object can be considered quite similar. However, objects are typically specific to one programming environment (e.g. Java) and are often even accessed in-process. By contrast, services are typically remotely accessed and are not specific to any programming environment. The only thing you need to know to talk to a service is the message protocol needed (e.g. SOAP). The other way that services and objects typically differ is in granularity. Objects are often very fine grained, requiring many calls to complete any one business task (a design well suited for in-process use). By contrast, services are typically coarse grained, requiring a small number of message exchanges to complete a business task.

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