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Leveraging Synchronization Contracts for Compositional Reasoning in Design of Services

The servlets platform is the preferred Java technology for implementing services on the Web. Based on a request/response programming model, the servlet programming model is simple and intuitive, yet very general, permitting flexible composition of services. Servlets are deployed to a container, which is meant to free a service developer to concentrate on design and implementation of a service’s “business logic.” Toward this end, the container automates details of messaging protocols and of resource and life-cycle management. In particular, the container manages threads executing in the servlets it hosts in order that the servlets can respond to requests from multiple, autonomous clients in a timely manner. The platform thus simplifies programming and promotes portability.