A portable interceptor mechanism for SOAP frameworks
Computer Standards & Interfaces
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Zwass suggested that middleware and messageservice is one of the five fundamental technologies used torealize Electronic Commerce (EC) [24]. The SimpleObject Access Protocol (SOAP) is recognized as a morepromising middleware for EC applications among otherleading candidates such as CORBA. We notice that thefault-tolerance issue is somewhat neglected in the currentstandard, i.e., SOAP 1.1 [23]. We therefore proposed afault tolerant web service called fault-tolerant SOAP orFT-SOAP through which web services can be built withhigher resilience to failure [14]. Active replication is acommon approach to building highly available andreliable distributed software applications. The redundantnested invocation (RNI) problem arises when servers in areplicated group issues nested invocations to other servergroups in response to a client invocation. In this work, wepropose a mechanism to perform auto-suppression ofredundant nested invocation in an active replicationFT-SOAP system. Our approach ensures the portabilityrequirement of a middleware, especially for FT-SOAP.