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Facade Design Pattern
The facade design pattern uses a single class to encapsulate the functionality of multiple children
classes. By reducing the number of classes and hiding the intricacy of the inner workings of these
classes, it becomes easier to use the overall system. We use the facade design pattern in several
classes. The most obvious is the web-based report viewing system.
All DHTML related functionality, including HTML page generation, DHTML widget and action handling,
resource loading and replet execution are encapsulated behind one servlet. The internal classes used to
support this functionality are hidden from users. This design allows very easy installation and
configuration of the Web server. Instead of installing multiple HTML files, images, servlets and
JavaScript files, a single servlet handles everything related to DHTML tasks.
Interpreter Design Pattern
The interpreter design pattern models a parsing tree of an expression or programming language. It is
an executable representation of the expression. After an interpreter object is built for an
expression, the interpreter can be executed to evaluate the expression. The internal hierarchy of
the expression is captured in the interpreter object tree.
InetSoft Enterprise products use the interpreter pattern to represent search conditions. Each condition
is a combination of comparison or logic expressions. After a search condition object is created, it can
be applied to a page to evaluate the page elements to check if the condition is met.
Composite Design Pattern
A composite object is an object that is composed of multiple instances of other objects. All objects
share a common composite interface. The common interface allows the user of the objects to treat a
composite object in the same way as a single object.
We use the composite pattern in the replet command class. All replet command classes share the same
interface. A command object can be a concrete implementation of a command, or can be composed of
several other commands.
Command Design Pattern
A command is an object that encapsulates the execution of a command. It often serves as the generic
API for adding user-defined actions to an existing system. The InetSoft Enterprise products
scheduling service uses the command pattern to allow any user defined actions to be scheduled. With
this generic API, the scheduler can be used for scheduling tasks other than report generation.
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