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  Instance Commotion and Message paths

Instance Commotion and Message paths

Instance Commotions

Objects do not exist in a vacuum and for  this  reason an analyst  should define  relationships for each  object in  the model. An instance connection is a modelling  notation that  defines a specific relationships  between  instances of  objects:

There are some  step to be followed for instances connections:

Step 1 Objects are connected by  simple lines. These connectivity's   indicate that some  important relationships  does exist .

Step 2 Once the lines have been established, each end is evaluated to determine whether a single (1:1) connection  exists or a multiple  connection (1: many) exists. For a (1:1) connection the line is annotated with  a single bar A (1: many) connection is  annotated with  a three pronged fork symbol as shown in fig 7.29, finally we add another  vertical bar if the connection is mandatory and a circle to represent an optional connection.

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Step 3 The resultant representation is  made in which all objects  relationship are made by single lines also required connections -1:1,1: many  etc. Are made  on them.

Message Paths

Message  paths are also known as message connections. They  are shown by dotted arrows among  the objects in which arrow  implies the   interchange of  messages in the  model. So , messages move along each instance connection  path: therefore messages connection  are derived directly from instance connections.

Like  structured  analysis, graphical graphical representation form the basis for the  OOA model and provides an excellent foundation for the creation of a software  requirement specification. Each objects represented graphically must also be described using a text  oriented format.

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