com.sleepycat.je.latch

Interface SharedLatch

All Superinterfaces:

Latch

All Known Implementing Classes:

LatchImpl, SharedLatchImpl, TimingLatch

public interface SharedLatch
extends Latch

Extends Latch to provide a reader-writer/shared-exclusive latch. This is implemented with Java's ReentrantReadWriteLock, which is extended for a few reasons (see Latch). This interface may be also be implemented using an underlying exclusive latch. This is done so that a single interface can be used for for all INs, even though BIN latches are exclusive-only. See method javadoc for their behavior in exclusive-only mode.

Method Summary

Modifier and Type	Method and Description
void	acquireShared() Acquires a latch for shared/read access.
boolean	isExclusiveOnly() Returns whether this latch is exclusive-only.

Methods inherited from interface com.sleepycat.je.latch.Latch

acquireExclusive, acquireExclusiveNoWait, clearStats, debugString, getExclusiveOwner, getNWaiters, getStats, isExclusiveOwner, isOwner, release, releaseIfOwner, toString

Method Detail

isExclusiveOnly

boolean isExclusiveOnly()

Returns whether this latch is exclusive-only.

acquireShared

void acquireShared()

Acquires a latch for shared/read access. In exclusive-only mode, calling this method is equivalent to calling Latch.acquireExclusive().