org.elasticsearch.common.util.concurrent

Interface RefCounted

All Known Implementing Classes:

AbstractRefCounted, FilteredSearchContext, InnerHitsContext.InnerHitSubContext, RecoveryTarget, SearchContext, Store, SubSearchContext

public interface RefCounted

An interface for objects that need to be notified when all reference to itself are not in user anymore. This implements basic reference counting for instance if async operations holding on to services that are close concurrently but should be functional until all async operations have joined Classes implementing this interface should ref counted at any time ie. if an object is used it's reference count should be increased before using it by calling #incRef and a corresponding #decRef must be called in a try/finally block to release the object again ie.:

      inst.incRef();
      try {
        // use the inst...

      } finally {
          inst.decRef();
      }
 

Method Summary

Modifier and Type	Method and Description
void	decRef() Decreases the refCount of this instance.
void	incRef() Increments the refCount of this instance.
boolean	tryIncRef() Tries to increment the refCount of this instance.

Method Detail

incRef

void incRef()

Increments the refCount of this instance.

Throws:

org.apache.lucene.store.AlreadyClosedException - iff the reference counter can not be incremented.

See Also:

decRef(), tryIncRef()

tryIncRef

boolean tryIncRef()

Tries to increment the refCount of this instance. This method will return true iff the refCount was

See Also:

decRef(), incRef()

decRef

void decRef()

Decreases the refCount of this instance. If the refCount drops to 0, then this instance is considered as closed and should not be used anymore.

See Also:

incRef()