alluxio.master.metastore.rocks

Class RocksSharedLockHandle

java.lang.Object

alluxio.master.metastore.rocks.RocksSharedLockHandle

All Implemented Interfaces:

AutoCloseable

public class RocksSharedLockHandle
extends Object
implements AutoCloseable

This is a handle used to manage a read lock(shared lock) on RocksStore. When the shared lock is held, exclusive locks will wait. That guarantees the RocksDB is not wiped out/closed while an r/w operation is active. RocksStore uses ref count for locking so releasing a read lock is just decrementing the reference count.

Constructor Summary

Constructors

Constructor and Description
RocksSharedLockHandle(int dbVersion, LongAdder refCount) The constructor.

Method Summary

Modifier and Type	Method and Description
void	close()
int	getLockVersion() Gets the version on the lock.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

RocksSharedLockHandle

public RocksSharedLockHandle(int dbVersion,
                             LongAdder refCount)

The constructor.

Parameters:

dbVersion - The RocksDB version. This version is updated when the RocksDB is restored or wiped out.

refCount - the ref count to decrement on close

Method Detail

getLockVersion

public int getLockVersion()

Gets the version on the lock.

Returns:

version

close

public void close()

Specified by:

close in interface AutoCloseable