Package org.drools.core.event

Class AbstractEventSupport<E extends EventListener>

java.lang.Object
org.drools.core.event.AbstractEventSupport<E>
All Implemented Interfaces:
Externalizable, Serializable
Direct Known Subclasses:
AgendaEventSupport, RuleEventListenerSupport, RuleRuntimeEventSupport
public abstract class AbstractEventSupport<E extends EventListener> extends Object implements Externalizable
Base class for Thread-safe Event Support in Drools. Note that subclasses wishing to access the listeners should do so via the getEventListenersIterator method. This will provide an Iterator accessing the current snapshot of the underlying list, freeing the subclasss of thread problems.

Please note that for lists of small sizes, and few modifications, the CopyOnWriteArrayList provides best performance. If the list is modified more often, than a simple ArrayList with synchonized operations, and copying of the array for iteration is faster.

See Also:

  • Constructor Details

    • AbstractEventSupport

      public AbstractEventSupport()

  • Method Details

    • readExternal

      public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException
      Specified by:
      readExternal in interface Externalizable
      Throws:
      IOException
      ClassNotFoundException

    • writeExternal

      public void writeExternal(ObjectOutput out) throws IOException
      Specified by:
      writeExternal in interface Externalizable
      Throws:
      IOException

    • notifyAllListeners

      public <O> void notifyAllListeners(O event, BiConsumer<E,O> consumer)

    • hasListeners

      protected boolean hasListeners()

    • addEventListener

      public final void addEventListener(E listener)
      Adds the specified listener to the list of listeners. Note that this method needs to be synchonized because it performs two independent operations on the underlying list
      Parameters:
      listener - to add

    • removeEventListener

      public final void removeEventListener(Class cls)
      Removes all event listeners of the specified class. Note that this method needs to be synchonized because it performs two independent operations on the underlying list
      Parameters:
      cls - class of listener to remove

    • removeEventListener

      public final void removeEventListener(E listener)

    • getEventListeners

      public List<E> getEventListeners()

    • clear

      public void clear()