Top Software Testing Companies: Interaction Diagram
Interaction diagram describes the sequence of events that occur with respect to a set of objects (a system of interconnected components). In addition, each system is considered to be open, i.e., this implies the existence of some system environment that the system interacts with. The environment can also be specified as a separate object.
The basic concept of object interaction diagram is the path of the object. In the diagram there is a separate vertical axis for each object. This axis contains the events related to this object. It is believed that all objects exist at the same time, and the sequences of events are developed in parallel. The object is described using the start (transparent box) and the terminal (black box) symbols of the object, indicating respectively the beginning and the end of the object’s description in the MSC-chart. Top software testing companies offer a wide range of testing services for you to make sure that your products meet the world-class standards.
The interaction between objects (as well as between the object and the system environment) is carried out using only messaging (Fig. 1).
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A message emulates the interaction (i.e, exchange of information) between the two system objects or between an object and system environment. From a system perspective, the interaction between the two objects is partitioned into two conjugate events: one object sends a message and the other receives it (Fig. 1). Messages coming from the system environment are simulated by one event – a message receiver, and events sent to the environment are modeled by one event – a message sender. The message has a name. The message name specifies the type of interaction. The diagram can describe several exchanges of messages with the same name. There is a so-called unique message instance name to uniquely identify a particular message exchange, but it is only used textually to remove ambiguity from description of conjugate events for different objects. It is not difficult to represent such problem graphically because the conjugate events are represented as different ends of the same graphic object (arrows on the path of one object to the path of another).
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