Asynchronous invocations are an important functionality in the context of distributed object frameworks, because in many situations clients should not block during remote invocations. There should be a loose coupling between clients and remote services. Popular web service frameworks, such as Apache Axis, offer only synchronous invocations (over HTTP). An alternative are messaging protocols but these implement a different communication paradigm. When client asynchrony is not supported, client developers have to build asynchronous invocations on top of the synchronous invocation facility. But this is tedious, error-prone, and might result in different remote invocation styles used within the same application. In this paper we build a framework using patterns for asynchronous invocation of web services. The framework design is based on the asynchrony patterns and other patterns from the same pattern language.
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