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oracle.javatools.buffer
Class MultiLock

java.lang.Object
oracle.javatools.buffer.MultiLock

public final class MultiLock

extends java.lang.Object

Acquires and releases a set of ReadWriteLock as a unit. Ensures that locks are always taken in a consistent order to avoid lock ordering deadlocks.

Method Summary

static MultiLock	get(java.util.Collection<ReadWriteLock> read, java.util.Collection<ReadWriteLock> write) Get a lock instance which obtains a mixture of read and write locks.
static MultiLock	getCopyLock(ReadWriteLock src, ReadWriteLock dest) Get an instance suitable for copying from a source to a destination.
static MultiLock	getReadLock(ReadWriteLock... locks) Get an instance which obtains read locks.
static MultiLock	getWriteLock(ReadWriteLock... locks) Get an instance which obtains write locks.
void	lock() Acquire the locks.
void	lockInterruptibly() Acquire the locks unless the calling thread is interrupted.
boolean	tryLock() Acquires the lock if it is possible to do so without blocking.
void	unlock() Release the locks.

Methods inherited from class java.lang.Object

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

Method Detail

getReadLock

public static MultiLock getReadLock(ReadWriteLock... locks)

Get an instance which obtains read locks.

Parameters:

locks - the locks to be locked for reading

Returns:

the instance

getWriteLock

public static MultiLock getWriteLock(ReadWriteLock... locks)

Get an instance which obtains write locks.

Parameters:

locks - the locks to be locked for writing

Returns:

the instance

getCopyLock

public static MultiLock getCopyLock(ReadWriteLock src,
                                    ReadWriteLock dest)

Get an instance suitable for copying from a source to a destination. A read lock is taken on the source, and a write lock is taken on the destination.

Parameters:

src - the source lock

dest - the destination lock

Returns:

the instance

get

public static MultiLock get(java.util.Collection<ReadWriteLock> read,
                            java.util.Collection<ReadWriteLock> write)

Get a lock instance which obtains a mixture of read and write locks.

Parameters:

read - the locks to be locked for reading

write - the locks to be locked for writing

Returns:

the instance

lock

public void lock()

Acquire the locks.

lockInterruptibly

public void lockInterruptibly()
                       throws java.lang.InterruptedException

Acquire the locks unless the calling thread is interrupted. If the thread is interrupted, any locks taken prior to the interruption are released.

Throws:

java.lang.InterruptedException - if the calling thread is interrupted

tryLock

public boolean tryLock()

Acquires the lock if it is possible to do so without blocking.

Returns:

true if the lock was acquired, false otherwise

unlock

public void unlock()

Release the locks.

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