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Web
Service Management System (WSMS) |
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With many enterprises moving
towards a service-oriented architecture,
web services are becoming a standard method of sharing data and
functionality among loosely coupled systems. The aim of this project is to build
a general-purpose Web Service Management System (WSMS) prototype that enables
querying multiple web services in a unified and transparent fashion through a
SQL-like interface.
Fig. 1. A schematic view of a WSMS
A WSMS consists of three major components:
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Metadata Component:
This component deals with registration of new
web services, and mapping their schemas to the global view
exported in the client interface.
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Query Processing and Optimization Component:
The job of this component is to take a
user-input query and find the optimal "query plan", i.e.,
the most efficient way to process the query by issuing calls
to the relevant web services. The execution engine then
executes this query plan by making actual web service calls
and efficiently managing the data exchange between the WSMS
and the various web services.
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Profiling and
Statistics Component:
This component
profiles web services for their response time
characteristics and maintains relevant statistics over the
web service data. These statistics are mainly used by the
query optimizer for making its optimization decisions.
For initial work on
our prototype, we are focusing particularly on the Query Processing
and Optimization component and assuming fairly simplistic Metadata
and Profiling components. We have developed novel algorithms
for query optimization over web services (see our
papers).
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