org.eclipse.rdf4j.common.concurrent.locks

Class ReadPrefReadWriteLockManager

java.lang.Object

org.eclipse.rdf4j.common.concurrent.locks.AbstractReadWriteLockManager

org.eclipse.rdf4j.common.concurrent.locks.ReadPrefReadWriteLockManager

All Implemented Interfaces:

ReadWriteLockManager

public class ReadPrefReadWriteLockManager
extends AbstractReadWriteLockManager

A read/write lock manager with reader preference. This lock manager block any requests for write locks until all read locks have been released.

Author:

Arjohn Kampman, James Leigh

Constructor Summary

Constructors

Constructor and Description
ReadPrefReadWriteLockManager() Creates a MultiReadSingleWriteLockManager.
ReadPrefReadWriteLockManager(boolean trackLocks) Creates a new MultiReadSingleWriteLockManager, optionally with lock tracking enabled.

Method Summary

Modifier and Type	Method and Description
Lock	getReadLock() Gets a read lock.
Lock	getWriteLock() Gets an exclusive write lock.
Lock	tryReadLock() Gets a read lock, if available.
Lock	tryWriteLock() Gets an exclusive write lock, if available.

Methods inherited from class org.eclipse.rdf4j.common.concurrent.locks.AbstractReadWriteLockManager

createReadLock, createWriteLock, isReaderActive, isWriterActive, waitForActiveReaders, waitForActiveWriter

Methods inherited from class java.lang.Object

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

Constructor Detail

ReadPrefReadWriteLockManager

public ReadPrefReadWriteLockManager()

Creates a MultiReadSingleWriteLockManager.

ReadPrefReadWriteLockManager

public ReadPrefReadWriteLockManager(boolean trackLocks)

Creates a new MultiReadSingleWriteLockManager, optionally with lock tracking enabled.

Parameters:

trackLocks - Controls whether the lock manager will keep track of active locks. Enabling lock tracking will add some overhead, but can be very useful for debugging.

Method Detail

tryReadLock

public Lock tryReadLock()

Gets a read lock, if available. This method will return null if the read lock is not immediately available.

getReadLock

public Lock getReadLock()
                 throws InterruptedException

Gets a read lock. This method blocks when a write lock is in use or has been requested until the write lock is released.

Throws:

InterruptedException - In case the thread requesting the lock was interrupted.

tryWriteLock

public Lock tryWriteLock()

Gets an exclusive write lock, if available. This method will return null if the write lock is not immediately available.

getWriteLock

public Lock getWriteLock()
                  throws InterruptedException

Gets an exclusive write lock. This method blocks when the write lock is in use or has already been requested until the write lock is released. This method also block when read locks are active until all of them are released.

Throws:

InterruptedException - In case the thread requesting the lock was interrupted.