Mediator Pattern
The
Mediator Pattern define an object that encapsulates how a set of objects
interact. Mediator promotes loose coupling by keeping objects from referring
to each other explicitly, and it lets you vary their interaction
independently.
A mediator is responsible for controlling and coordinating the
interactions of a group of objects. The mediator serves as an intermediary
that keeps objects in the group from referring to each other explicitly. The
objects only know the mediator, thereby reducing the number of
interconnections.
Wizard
Applicability
Additional Resources

Option |
Description |
Default |
Source folder |
Enter a source folder for the new class. Either type a valid
source folder path or click Browse to select a source
folder via a dialog. |
The source folder of the element that was selected when the
wizard was started. |
Package |
Enter a package to contain the new class. Either type a
valid package name or click Browse to select a package via
a dialog. |
The package of the element that was selected when the wizard
has been started. |
Mediator interface |
Type or click Browse to
select a mediator interface. |
<Mediator> |
Changed method |
Type or select the name of the method that will
be called when something has changed. |
<changed> |
Colleague interface |
Type or click Browse to
select a colleague class. |
<Colleague> |
Modifiers |
Select one or more access modifiers for the new class.
- public (uncheck for default visibility)
- abstract
|
public |
Superclass |
Type or click Browse to
select a superclass for this class. |
<java.lang.Object> |
Mediator field |
Type or select the name of the field that will contain the
instance of the mediator class |
<mediator> |
Get mediator method |
Type or select the name of the method that will
return the
instance of the mediator class |
<getMediator> |

Option |
Description |
Default |
Concrete mediator classes |
Click Add to enter names of concrete
mediator classes that
should be created. |
<blank> |
Concrete colleague classes |
Click Add to enter names of concrete
colleague classes that
should be created. |
<blank> |
Method names |
Click Add to enter names of sample
methods that
should be created in the concrete colleague classes |
<blank> |
Use the Mediator pattern when
- a set of objects communicate in well-defined but complex ways. The
resulting interdependencies are unstructured and difficult to
understand.
- reusing an object is difficult because it refers to and communicates
with many other objects.
- a behavior that's distributed between several classes should be
customizable without a lot of subclassing.
http://c2.com/cgi/wiki?MediatorPattern
http://www.wikipedia.org/wiki/Mediator_pattern
http://www.cmcrossroads.com/bradapp/javapats.html#Mediator
http://www.dofactory.com/patterns/pattern_mediator.asp
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