Package org.eclipse.aether.named.support

Class FileLockNamedLock

java.lang.Object

org.eclipse.aether.named.support.NamedLockSupport

org.eclipse.aether.named.support.FileLockNamedLock

All Implemented Interfaces:

AutoCloseable, NamedLock

public final class FileLockNamedLock
extends NamedLockSupport

Named lock that uses FileLock. An instance of this class is about ONE LOCK (one file) and is possibly used by multiple threads. Each thread (if properly coded re boxing) will try to obtain either shared or exclusive lock. As file locks are JVM-scoped (so one JVM can obtain same file lock only once), the threads share file lock and synchronize according to it. Still, as file lock obtain operation does not block (or in other words, the method that does block cannot be controlled for how long it blocks), we are "simulating" thread blocking using Retry utility. This implementation performs coordination not only on thread (JVM-local) level, but also on process level, as long as other parties are using this same "advisory" locking mechanism.

Since:

1.7.3

Field Summary

Fields inherited from class org.eclipse.aether.named.support.NamedLockSupport

logger

Constructor Summary

Constructors

Constructor	Description
FileLockNamedLock(NamedLockKey key, FileChannel fileChannel, NamedLockFactorySupport factory)

Method Summary

Modifier and Type	Method	Description
protected boolean	doLockExclusively(long time, TimeUnit unit)
protected boolean	doLockShared(long time, TimeUnit unit)
protected void	doUnlock()

Methods inherited from class org.eclipse.aether.named.support.NamedLockSupport

close, diagnosticState, doClose, key, lockExclusively, lockShared, toString, unlock

Methods inherited from class java.lang.Object

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

Constructor Details

FileLockNamedLock

public FileLockNamedLock(NamedLockKey key,
 FileChannel fileChannel,
 NamedLockFactorySupport factory)

Method Details

doLockShared

protected boolean doLockShared(long time,
 TimeUnit unit)
                        throws InterruptedException

Specified by:

doLockShared in class NamedLockSupport

Throws:

InterruptedException

doLockExclusively

protected boolean doLockExclusively(long time,
 TimeUnit unit)
                             throws InterruptedException

Specified by:

doLockExclusively in class NamedLockSupport

Throws:

InterruptedException

doUnlock

protected void doUnlock()

Specified by:

doUnlock in class NamedLockSupport