src/java/org/apache/cassandra/cache/FreeableMemory.java
/** decrement reference count.  if count reaches zero, the object is freed. */
decrement reference count.  if count reaches zero, the object is freed.
decrement reference count . if count reaches zero the object is freed .
public void unreference()
    {
        if (references.decrementAndGet() == 0)
            free();
    }
public void unreference ( ) { if ( references . decrementAndGet ( ) == 0 ) free ( ) ; }
decrement reference count.
decrement reference count .