It indicates that the architecture is pluggable to existing Web applications,
and therefore no modifications are required to existing code. This chapter also
indicates that availability is achieved by replication, and strong replica consistency is
automatically guaranteed by using off-the-shelf group communication components.
The most distinctive feature of the proposed architecture is that it explicitly addresses
replica consistency, providing automatic strong replica consistency.
??? The ninth chapter is entitled ???A Scalable QoS-Aware Web Services Management
Architecture (QoSMA)???. It proposes a scalable QoS-aware architecture for the management
of QoS-aware Web services to provide QoS management support for both
Web services??™ providers and consumers. This chapter indicates that the proposed
architecture is based on the commonly-used notion of QoS brokerage service that
mediates between service requestors and service providers. Its responsibilities include
performance monitoring of Web services, supporting users in Web services selection
based on their QoS requirements, and the negotiation of QoS issues between requestors
and providers. This chapter indicates that the proposed architecture provides several
benefits, including the automation of QoS management and QoS monitoring for both
providers and clients, allowing for better handling of the increasing demand while
maintaining the pre-agreed-on QoS between service requestors and providers through
the scalability of the architecture.
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