In this setting, a request is send to only one object, however there should be several related objects that take the responsibility. So a chain is build so as to create the final response.
The chain is usually created automatically when Composite pattern is used, since each object might keep a pointer to its parent. So the request sent to a leaf can be propagated further to its parent. The forwarding procedure can also be used to pass the request to who can handle it if the current object can not.
Sunday, April 22, 2007
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