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.
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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