java.lang.Object
- com.google.android.exoplayer2.util.ListenerSet<T>

Type Parameters:

T - The listener type.
```
public final class ListenerSet<T extends @NonNull Object>
extends Object
```
A set of listeners.
Events are guaranteed to arrive in the order in which they happened even if a new event is triggered recursively from another listener.
Events are also guaranteed to be only sent to the listeners registered at the time the event was enqueued and haven't been removed since.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static interface`	`ListenerSet.Event<T>`	An event sent to a listener.
`static interface`	`ListenerSet.IterationFinishedEvent<T>`	An event sent to a listener when all other events sent during one `Looper` message queue iteration were handled by the listener.

Constructor Summary

Constructors
Constructor	Description
`ListenerSet(Looper looper, Clock clock, ListenerSet.IterationFinishedEvent<T> iterationFinishedEvent)`	Creates a new listener set.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`add(T listener)`	Adds a listener to the set.
`ListenerSet<T>`	`copy(Looper looper, ListenerSet.IterationFinishedEvent<T> iterationFinishedEvent)`	Copies the listener set.
`void`	`flushEvents()`	Notifies listeners of events previously enqueued with `queueEvent(int, Event)`.
`void`	`queueEvent(int eventFlag, ListenerSet.Event<T> event)`	Adds an event that is sent to the listeners when `flushEvents()` is called.
`void`	`release()`	Releases the set of listeners immediately.
`void`	`remove(T listener)`	Removes a listener from the set.
`void`	`sendEvent(int eventFlag, ListenerSet.Event<T> event)`	`Queues` a single event and immediately `flushes` the event queue to notify all listeners.
`int`	`size()`	Returns the number of added listeners.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - ListenerSet
```
public ListenerSet(Looper looper,
                   Clock clock,
                   ListenerSet.IterationFinishedEvent<T> iterationFinishedEvent)
```
    Creates a new listener set.
    
    Parameters:
    
    looper - A Looper used to call listeners on. The same Looper must be used to call all other methods of this class.
    
    clock - A Clock.
    
    iterationFinishedEvent - An ListenerSet.IterationFinishedEvent sent when all other events sent during one Looper message queue iteration were handled by the listeners.
- Method Detail
  - copy
```
@CheckResult
public ListenerSet<T> copy(Looper looper,
                           ListenerSet.IterationFinishedEvent<T> iterationFinishedEvent)
```
    Copies the listener set.
    
    Parameters:
    
    looper - The new Looper for the copied listener set.
    
    iterationFinishedEvent - The new ListenerSet.IterationFinishedEvent sent when all other events sent during one Looper message queue iteration were handled by the listeners.
    
    Returns:
    
    The copied listener set.
  - add
```
public void add(T listener)
```
    Adds a listener to the set.
    If a listener is already present, it will not be added again.
    
    Parameters:
    
    listener - The listener to be added.
  - remove
```
public void remove(T listener)
```
    Removes a listener from the set.
    If the listener is not present, nothing happens.
    
    Parameters:
    
    listener - The listener to be removed.
  - size
```
public int size()
```
    Returns the number of added listeners.
  - queueEvent
```
public void queueEvent(int eventFlag,
                       ListenerSet.Event<T> event)
```
    Adds an event that is sent to the listeners when flushEvents() is called.
    
    Parameters:
    
    eventFlag - An integer indicating the type of the event, or C.INDEX_UNSET to report this event without flag.
    
    event - The event.
  - flushEvents
```
public void flushEvents()
```
    Notifies listeners of events previously enqueued with queueEvent(int, Event).
  - sendEvent
```
public void sendEvent(int eventFlag,
                      ListenerSet.Event<T> event)
```
    Queues a single event and immediately flushes the event queue to notify all listeners.
    
    Parameters:
    
    eventFlag - An integer flag indicating the type of the event, or C.INDEX_UNSET to report this event without flag.
    
    event - The event.
  - release
```
public void release()
```
    Releases the set of listeners immediately.
    This will ensure no events are sent to any listener after this method has been called.

Class ListenerSet<T extends @NonNull Object>

Nested Class Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

ListenerSet

Method Detail

copy

add

remove

size

queueEvent

flushEvents

sendEvent

release