January 2018
Intermediate to advanced
336 pages
7h 56m
English
Content preview from Microservices with Clojure
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The interceptor chain
Interceptors in Pedestal can be composed as an interceptor chain that follows the Chain of Responsibility (https://en.wikipedia.org/wiki/Chain-of-responsibility_pattern) design pattern. Each interceptor does exactly one job and when composed together as an interceptor chain, they achieve a bigger task consisting of one or more jobs.
The Chain of Responsibility pattern helps with navigating the composite structure of the interceptor chain. The control flow within the interceptor chain is controlled by a Context Map. Since a Context Map itself is passed as input to each interceptor, interceptors can optionally add, remove, or reorder interceptors in the chain. This is one of the reasons why most of the modules of a web ...
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