Module org.pdfsam.eventstudio

Package org.pdfsam.eventstudio

Class DefaultEventStudio

java.lang.Object

org.pdfsam.eventstudio.DefaultEventStudio

All Implemented Interfaces:

EventStudio

public class DefaultEventStudio
extends Object
implements EventStudio

Default implementation of EventStudio. It doesn't enforce a Singleton pattern, and it's up to the user to decide how to use it and how many EventStudio the application needs. A singleton implementation with lazy initialization is provided with StaticStudio where the typical usage is:

 
 import static org.eventstudio.StaticStudio.eventStudio;
 
 public class Foo{
     void doSomethingAndNotify(){
        .....
        eventStudio.broadcast(new ImFinished(), "station");
     } 
 }
 
 

Hidden Station: The hidden station is a pre-built station with "hidden.station" name that is used to hide the station abstraction. Helper method are provided by DefaultEventStudio where the station name parameter is missing from the parameters list and the HIDDEN_STATION is used, providing a more traditional event bus pub/sub pattern.

Author:

Andrea Vacondio

Field Summary

Fields

Modifier and Type	Field	Description
static final String	HIDDEN_STATION	A reserved station name that is used to hide the station abstraction.

Fields inherited from interface org.pdfsam.eventstudio.EventStudio

MAX_QUEUE_SIZE_PROP

Constructor Summary

Constructors

Constructor	Description
DefaultEventStudio()

Method Summary

Modifier and Type	Method	Description
<T> void	add(Class<T> eventClass, Listener<T> listener)	Adds a Listener to the hidden station listening for the given event class, hiding the station abstraction.
<T> void	add(Class<T> eventClass, Listener<T> listener, int priority, ReferenceStrength strength)	Adds a Listener (with the given priority and strength ) to the hidden station listening for the given event class, hiding the station abstraction.
<T> void	add(Class<T> eventClass, Listener<T> listener, String station)	Adds the given Listener, listening for the given event class, to the given station using default priority(0) ad default strength ReferenceStrength.STRONG.
<T> void	add(Class<T> eventClass, Listener<T> listener, String station, int priority, ReferenceStrength strength)	Adds the given Listener, listening for the given event class, to the given station using the given priority (low values mean higher priority) and strength.
<T> void	add(Listener<T> listener)	Adds a Listener to the hidden station, hiding the station abstraction.
<T> void	add(Listener<T> listener, int priority, ReferenceStrength strength)	Adds a Listener (with the given priority and strength ) to the hidden station, hiding the station abstraction.
<T> void	add(Listener<T> listener, String station)	Adds the given Listener to the given station using default priority(0) ad default strength ReferenceStrength.STRONG.
<T> void	add(Listener<T> listener, String station, int priority, ReferenceStrength strength)	Adds the given Listener to the given station using the given priority (low values mean higher priority) and strength.
void	addAnnotatedListeners(Object bean)	Discovers annotated method on the given bean and adds them as Listeners
void	broadcast(Object event)	Broadcast the event to the hidden station
void	broadcast(Object event, String station)	Broadcasts the given event to the given station.
void	broadcastToEveryStation(Object event)	Broadcasts the given event to every station.
void	clear()	Clears the hidden station
void	clear(String station)	Clear the given station removing the whole station from the EventStudio which means that Listeners and Supervisor will not be notified anymore.
<T> boolean	remove(Class<T> eventClass, Listener<T> listener)	Removes the given listener listening on the given event, from the hidden station, hiding the station abstraction.
<T> boolean	remove(Class<T> eventClass, Listener<T> listener, String station)	Removes the first occurrence of the given Listener listening for the given event, from the given station
<T> boolean	remove(Listener<T> listener)	Removes the given listener from the hidden station, hiding the station abstraction.
<T> boolean	remove(Listener<T> listener, String station)	Removes the first occurrence of the given Listener from the given station.
void	supervisor(Supervisor supervisor)	Adds a Supervisor to the hidden station, hiding the station abstraction.
void	supervisor(Supervisor supervisor, String station)	Sets a Supervisor for the given station.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

HIDDEN_STATION

public static final String HIDDEN_STATION

A reserved station name that is used to hide the station abstraction. Using the provided helper methods the station concept remains totally hidden and EventStudio can be used as a more traditional Event Bus with pub/sub pattern.

See Also:

• Constant Field Values

Constructor Details

DefaultEventStudio

public DefaultEventStudio()

Method Details

add

public <T> void add(Listener<T> listener,
 String station,
 int priority,
 ReferenceStrength strength)

Description copied from interface: EventStudio

Adds the given Listener to the given station using the given priority (low values mean higher priority) and strength.

Specified by:

add in interface EventStudio

add

public <T> void add(Listener<T> listener,
 String station)

Description copied from interface: EventStudio

Adds the given Listener to the given station using default priority(0) ad default strength ReferenceStrength.STRONG.

Specified by:

add in interface EventStudio

add

public <T> void add(Class<T> eventClass,
 Listener<T> listener,
 String station)

Description copied from interface: EventStudio

Adds the given Listener, listening for the given event class, to the given station using default priority(0) ad default strength ReferenceStrength.STRONG. This adds method is useful when a listener can listen for a hierarchy of events.

Specified by:

add in interface EventStudio

See Also:

• EventStudio.add(Class, Listener, String, int, ReferenceStrength)

add

public <T> void add(Class<T> eventClass,
 Listener<T> listener,
 String station,
 int priority,
 ReferenceStrength strength)

Description copied from interface: EventStudio

Adds the given Listener, listening for the given event class, to the given station using the given priority (low values mean higher priority) and strength. This adds method is useful when a listener can listen for a hierarchy of events:

 
 class BroadListener{@code <T extends ParentEvent> implements Listener<T>} { 
     void onEvent(ParentEvent e){
           LOG.debug(e);
     }
 }
 
 class X {
   public void init() {
     EventStudio studio = ....
     studio.add(ChildEvent.class, new BroadListener{@code <ChildEvent>}(), "mystation");
     studio.add(AnotherChildEvent.class, new BroadListener{@code <AnotherChildEvent>()}, "mystation");
     ...
   }
 }
 
 
 

Specified by:

add in interface EventStudio

addAnnotatedListeners

public void addAnnotatedListeners(Object bean)

Description copied from interface: EventStudio

Discovers annotated method on the given bean and adds them as Listeners

Specified by:

addAnnotatedListeners in interface EventStudio

See Also:

• EventListener
• EventStation

add

public <T> void add(Class<T> eventClass,
 Listener<T> listener,
 int priority,
 ReferenceStrength strength)

Adds a Listener (with the given priority and strength ) to the hidden station listening for the given event class, hiding the station abstraction.

See Also:

• EventStudio.add(Listener, String, int, ReferenceStrength)
• HIDDEN_STATION

add

public <T> void add(Listener<T> listener,
 int priority,
 ReferenceStrength strength)

Adds a Listener (with the given priority and strength ) to the hidden station, hiding the station abstraction.

See Also:

• EventStudio.add(Listener, String, int, ReferenceStrength)
• HIDDEN_STATION

add

public <T> void add(Listener<T> listener)

Adds a Listener to the hidden station, hiding the station abstraction.

See Also:

• EventStudio.add(Listener, String)
• HIDDEN_STATION

add

public <T> void add(Class<T> eventClass,
 Listener<T> listener)

Adds a Listener to the hidden station listening for the given event class, hiding the station abstraction.

See Also:

• EventStudio.add(Class, Listener, String)
• HIDDEN_STATION

supervisor

public void supervisor(Supervisor supervisor)

Adds a Supervisor to the hidden station, hiding the station abstraction.

See Also:

• EventStudio.supervisor(Supervisor, String)
• HIDDEN_STATION

supervisor

public void supervisor(Supervisor supervisor,
 String station)

Description copied from interface: EventStudio

Sets a Supervisor for the given station. It will be notified of every event broadcasted to the station prior its delivery to the proper Listeners allowing event inspection.

Supervisors cannot be removed but they can be replaces. See Supervisor.SLACKER

Specified by:

supervisor in interface EventStudio

remove

public <T> boolean remove(Listener<T> listener,
 String station)

Description copied from interface: EventStudio

Removes the first occurrence of the given Listener from the given station.

Specified by:

remove in interface EventStudio

Returns:

true if the listener was successfully removed

remove

public <T> boolean remove(Class<T> eventClass,
 Listener<T> listener,
 String station)

Description copied from interface: EventStudio

Removes the first occurrence of the given Listener listening for the given event, from the given station

Specified by:

remove in interface EventStudio

Returns:

true if the listener was successfully removed

remove

public <T> boolean remove(Listener<T> listener)

Removes the given listener from the hidden station, hiding the station abstraction.

Returns:

true if the listener was found and removed

See Also:

• EventStudio.remove(Listener, String)
• HIDDEN_STATION

remove

public <T> boolean remove(Class<T> eventClass,
 Listener<T> listener)

Removes the given listener listening on the given event, from the hidden station, hiding the station abstraction.

Returns:

true if the listener was found and removed

See Also:

• EventStudio.remove(Listener, String)
• HIDDEN_STATION

clear

public void clear(String station)

Description copied from interface: EventStudio

Clear the given station removing the whole station from the EventStudio which means that Listeners and Supervisor will not be notified anymore. A station with the same name can be recreated.

Specified by:

clear in interface EventStudio

clear

public void clear()

Clears the hidden station

See Also:

• EventStudio.clear(String)
• HIDDEN_STATION

broadcast

public void broadcast(Object event,
 String station)

Description copied from interface: EventStudio

Broadcasts the given event to the given station. Listeners listening the given station and bound to the event class will be notified.

Specified by:

broadcast in interface EventStudio

broadcast

public void broadcast(Object event)

Broadcast the event to the hidden station

See Also:

• EventStudio.broadcast(Object, String)
• HIDDEN_STATION

broadcastToEveryStation

public void broadcastToEveryStation(Object event)

Description copied from interface: EventStudio

Broadcasts the given event to every station. Listeners bound to the event class (no matter the station they are listening) will be notified.

Specified by:

broadcastToEveryStation in interface EventStudio