Choices for Service Architecture
A client will only be looking for an implementation of an interface, and the implementation can be done in many different ways, as discussed in this chapter. In the previous chapter we discussed the roles of service proxy and service backend and briefly talked about how different implementations could place different amounts of processing in the proxy or backend. This can lead to situations such as a thin proxy communicating to a fat backend using RMI, or at the other end of the scale, to a fat proxy and a thin backend. The last chapter showed one implementation—a fat proxy with a backend so thin that it did not exist. This chapter fills in some of the other possibilities.
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