The fundamental API contracts for the Chain of Responsibilty Pattern as
implemented in this package. See
org.apache.commons.chain.impl for
convenient base implementations of Chain and Context,
and see org.apache.commons.chain.web for
specialized Context implementations suitable for use in web
applications.
Basis for specialized Context implementations suitable for use
in web applications, and generic Command implementations useful
across web application environments.
A Catalog is a collection of named Commands (or
Chains) that can be used to retrieve the set of commands that
should be performed based on a symbolic identifier.
A Command encapsulates a unit of processing work to be
performed, whose purpose is to examine and/or modify the state of a
transaction that is represented by a Context.