document: Non-intrusive monitoring and service adaptation for WS-BPEL Web service processes currently lack monitoring and dynamic ( runtime ) adaptation mechanisms . In highly dynamic processes , services frequently need to be exchanged due to a variety of reasons . In this paper we present VieDAME , a system which allows monitoring of BPEL processes according to Quality of Service ( QoS ) attributes and replacement of existing partner services based on various ( pluggable ) replacement strategies . The chosen replacement services can be syntactically or semantically equivalent to the BPEL interface . Services can be automatically replaced during runtime without any downtime of the overall system . We implemented our solution with an aspect-oriented approach by intercepting SOAP messages and allow services to be exchanged during runtime with little performance penalty costs , as shown in our experiments , thereby making our approach suitable for high-availability BPEL environments .
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