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A handler may call the doChain() method several times if needed, so handlers are required to consider the possibility they will be invoked more than once for the same request.
All handler related interfaces reside in the comorg.hpapache.symphonywink.server.handlers package.

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The MessageContext allows the following:
Allows The MessageContext allows handlers to access and manipulate the current request informationAllows handlers to maintain a state by setting attributes on the message context, as the handlers themselves are singletons and therefore statelessAllows handlers to pass information to other handlers on the chain

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The Request Handler Chain is responsible for processing a request according to the JAX-RS specification by accepting the request, searching for the resource method to invoke, de-serializing the request entity and finally for invoking the resource method. It is responsible for invoking sub-resource locators by moving up and down the chain as needed. A Request handler is a class that implements the comorg.hpapache.wink.server.handlers.RequestHandler interface.

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The Response Handler Chain is responsible for handling the object returned from invoking a resource method or sub-resource method according to the JAX-RS specification. It is responsible for determining the response status code, selecting the response media type and for serializing the response entity.
A Response handler is a class that implements the comorg.hpapache.wink.server.handlers.ResponseHandler interface.

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An Error handler is a class that implements the comorg.hpapache.symphonywink.server.handlers.ResponseHandler interface.

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