stephenbute workspace

The case is a data service provider  serving data to many client.Usually it maintain only one set of data object in the service which is called value object. And return each set of data object to ea

DefinitionDefine a new operation to deal with the classes of the elements without changing their structures. Where to use & benefitsAdd operations on a bunch of classes which have different inte

DefinitionOne object changes state, all of its dependents are updated automatically. Where to use & benefitsOne change affects one or many objects. Many object behavior depends on one object sta

DefinitionTo record an object internal state without violating encapsulation and reclaim it later without knowledge of the original object. Where to use & benefitsLet some info in an object to b

DefinitionProvides a definition of a macro language or syntax and parsing into objects in a program. Where to use & benefitsNeed your own parser generator. Translate a specific expression. Handl

DefinitionLet more than one object handle a request without their knowing each other. Pass the request to chained objects until it has been handled. Where to use & benefitsOne request should be

DefinitionStreamlize objects by providing an interface to encapsulate a request and make the interface implemented by subclasses in order to parameterize the clients. Where to use & benefitsOne

DefinitionUse a simple object to represent a complex one or provide a placeholder for another object to control access to it. Where to use & benefitsIf creating an object is too expensive in tim

 DefinitionDecouple an abstraction or interface from its implementation so that the two can vary independently. Where to use & benefitsWant to separate abstraction and implementation permanently