Package org.kie.api.event.process

## Interface ProcessEventListener

- All Superinterfaces:
    `EventListener`
  All Known Implementing Classes:
    `DefaultProcessEventListener`

      public interface ProcessEventListener
      extends EventListener

  A listener for events related to process instance execution.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods Default Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `void` | `afterNodeLeft​(ProcessNodeLeftEvent event)` | This listener method is invoked right after a node in a process instance has been left (which is when the node was completed, for example when it performed the task it was designed for).
    `void` | `afterNodeTriggered​(ProcessNodeTriggeredEvent event)` | This listener method is invoked right after a node in a process instance has been triggered (which is when the node was entered, for example when an incoming connection triggered it).
    `void` | `afterProcessCompleted​(ProcessCompletedEvent event)` | This listener method is invoked right after a process instance has been completed (or aborted).
    `void` | `afterProcessStarted​(ProcessStartedEvent event)` | This listener method is invoked right after a process instance has been started.
    `default void` | `afterSLAViolated​(SLAViolatedEvent event)` | This listener method is invoked right after a process/node instance's SLA has been violated.
    `void` | `afterVariableChanged​(ProcessVariableChangedEvent event)` | This listener method is invoked right after the value of a process variable has been changed.
    `void` | `beforeNodeLeft​(ProcessNodeLeftEvent event)` | This listener method is invoked right before a node in a process instance is being left (which is when the node is completed, for example when it has performed the task it was designed for).
    `void` | `beforeNodeTriggered​(ProcessNodeTriggeredEvent event)` | This listener method is invoked right before a node in a process instance is being triggered (which is when the node is being entered, for example when an incoming connection triggers it).
    `void` | `beforeProcessCompleted​(ProcessCompletedEvent event)` | This listener method is invoked right before a process instance is being completed (or aborted).
    `void` | `beforeProcessStarted​(ProcessStartedEvent event)` | This listener method is invoked right before a process instance is being started.
    `default void` | `beforeSLAViolated​(SLAViolatedEvent event)` | This listener method is invoked right before a process/node instance's SLA has been violated.
    `void` | `beforeVariableChanged​(ProcessVariableChangedEvent event)` | This listener method is invoked right before the value of a process variable is being changed.
    `default void` | `onMessage​(MessageEvent event)` | This listener method is invoked when a message is sent
    `default void` | `onSignal​(SignalEvent event)` | This listener method is invoked when a signal is sent

- - ### Method Detail

    - #### beforeProcessStarted

          void beforeProcessStarted​(ProcessStartedEvent event)

      This listener method is invoked right before a process instance is being started.
      Parameters:
        `event` -

    - #### afterProcessStarted

          void afterProcessStarted​(ProcessStartedEvent event)

      This listener method is invoked right after a process instance has been started.
      Parameters:
        `event` -

    - #### beforeProcessCompleted

          void beforeProcessCompleted​(ProcessCompletedEvent event)

      This listener method is invoked right before a process instance is being completed (or aborted).
      Parameters:
        `event` -

    - #### afterProcessCompleted

          void afterProcessCompleted​(ProcessCompletedEvent event)

      This listener method is invoked right after a process instance has been completed (or aborted).
      Parameters:
        `event` -

    - #### beforeNodeTriggered

          void beforeNodeTriggered​(ProcessNodeTriggeredEvent event)

      This listener method is invoked right before a node in a process instance is being triggered (which is when the node is being entered, for example when an incoming connection triggers it).
      Parameters:
        `event` -

    - #### afterNodeTriggered

          void afterNodeTriggered​(ProcessNodeTriggeredEvent event)

      This listener method is invoked right after a node in a process instance has been triggered (which is when the node was entered, for example when an incoming connection triggered it).
      Parameters:
        `event` -

    - #### beforeNodeLeft

          void beforeNodeLeft​(ProcessNodeLeftEvent event)

      This listener method is invoked right before a node in a process instance is being left (which is when the node is completed, for example when it has performed the task it was designed for).
      Parameters:
        `event` -

    - #### afterNodeLeft

          void afterNodeLeft​(ProcessNodeLeftEvent event)

      This listener method is invoked right after a node in a process instance has been left (which is when the node was completed, for example when it performed the task it was designed for).
      Parameters:
        `event` -

    - #### beforeVariableChanged

          void beforeVariableChanged​(ProcessVariableChangedEvent event)

      This listener method is invoked right before the value of a process variable is being changed.
      Parameters:
        `event` -

    - #### afterVariableChanged

          void afterVariableChanged​(ProcessVariableChangedEvent event)

      This listener method is invoked right after the value of a process variable has been changed.
      Parameters:
        `event` -

    - #### beforeSLAViolated

          default void beforeSLAViolated​(SLAViolatedEvent event)

      This listener method is invoked right before a process/node instance's SLA has been violated.
      Parameters:
        `event` -

    - #### afterSLAViolated

          default void afterSLAViolated​(SLAViolatedEvent event)

      This listener method is invoked right after a process/node instance's SLA has been violated.
      Parameters:
        `event` -

    - #### onSignal

          default void onSignal​(SignalEvent event)

      This listener method is invoked when a signal is sent
      Parameters:
        `event` -

    - #### onMessage

          default void onMessage​(MessageEvent event)

      This listener method is invoked when a message is sent
      Parameters:
        `event` -