Package org.apache.solr.util

Class RefCounted<Type>

java.lang.Object
org.apache.solr.util.RefCounted<Type>
public abstract class RefCounted<Type> extends Object
Keep track of a reference count on a resource and close it when the count hits zero.

By itself, this class could have some race conditions since there is no synchronization between the refcount check and the close. Solr's use in reference counting searchers is safe since the count can only hit zero if it's unregistered (and hence incref() will not be called again on it).

  • Field Details

    • resource

      protected final Type resource

    • refcount

      protected final AtomicInteger refcount

  • Constructor Details

    • RefCounted

      public RefCounted(Type resource)

  • Method Details

    • getRefcount

      public int getRefcount()

    • incref

      public final RefCounted<Type> incref()

    • get

      public final Type get()

    • decref

      public void decref()

    • close

      protected abstract void close()