6 PubSub Communication Parameters

6.2 Common Configuration Parameters

6.2.1 PubSubState State Machine

The PubSubState is used to expose and control the operation of a PubSub component. It is an enumeration of the possible states. The enumeration values are described in Table 1.

Table 1 – PubSubState Values

Value	Description
Disabled_0	The PubSub component is configured but currently disabled.
Paused_1	The PubSub component is enabled but currently paused by a parent component. The parent component is either Disabled_0 or Paused_1.
Operational_2	The PubSub component is operational.
Error_3	The PubSub component is in an error state.

Figure 19 depicts the PubSub components that have a PubSub state and their parent-child relationship. State changes of children are based on changes of the parent state. The root of the hierarchy is the PublishSubscribe component.

Figure 19 – PubSub Component State Dependencies

Figure 20 describes the formal state machine with the possible transitions.

Figure 20 – PubSubState State Machine

Table 2 formally defines the transitions of the state machine.

Table 2 – PubSubState State Machine

Source State	Target State	Trigger Description
Disabled_0	Paused_1	The component was successfully enabled but the parent component is in the state Disabled_0 or Paused_1.
Disabled_0	Operational_2	The component was successfully enabled.
Paused_1	Disabled_0	The component was successfully disabled.
Paused_1	Operational_2	The state of the parent component changed to Operational_2.
Operational_2	Disabled_0	The component was successfully disabled.
Operational_2	Paused_1	The state of the parent component changed to Disabled_0 or Paused_1.
Operational_2	Error_3	There is a pending error situation for the related PubSub component.
Error_3	Disabled_0	The component was successfully disabled.
Error_3	Paused_1	The state of the parent component changed to Disabled_0 or Paused_1.
Error_3	Operational_2	The error situation was resolved for the related PubSub component.