Java Doc for LockHelper.java in  » Workflow-Engines » pegasus-2.1.0 » org » griphyn » vdl » util » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Workflow Engines » pegasus 2.1.0 » org.griphyn.vdl.util   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.griphyn.vdl.util.LockHelper LockHelper public class LockHelper (Code) author:    Jens-S. Vöckler author:    Yong Zhao version:    $Revision: 50 $ See Also:   java.io.File Field Summary final public static  String LOCK_SUFFIX      The suffix to use for the regular lock file. Constructor Summary public   LockHelper()      default ctor. public   LockHelper(long timeout, int retries)      ctor. Method Summary public  File createLock(String filename)      Creates a file-based lock file in an NFS secure fashion. public  boolean lockFile(String filename)      Locks a file using an empty lockfile. public  boolean unlockFile(String filename)      Releases a lock file from its basename. Parameters:   filename - is the name of the basename of the file to unlock.The locking extension will be added internally. Field Detail LOCK_SUFFIX final public static String LOCK_SUFFIX(Code) The suffix to use for the regular lock file. Constructor Detail LockHelper public LockHelper()(Code) default ctor. LockHelper public LockHelper(long timeout, int retries)(Code) ctor. Method Detail createLock public File createLock(String filename)(Code) Creates a file-based lock file in an NFS secure fashion. Do not use this function for locking, use LockHelper.lockFile(String) instead. One exception is to use this method for test-and-set locking. Parameters:   filename - is the file to create a lockfile for the representation of the lock file, or null in case of error. lockFile public boolean lockFile(String filename)(Code) Locks a file using an empty lockfile. This method repeatedly retries to lock a file, and gives up after a few seconds. Parameters:   filename - is the basename of the file to lock. true, if the file was locked successfully, false otherwise. unlockFile public boolean unlockFile(String filename)(Code) Releases a lock file from its basename. Parameters:   filename - is the name of the basename of the file to unlock.The locking extension will be added internally. true, if the lock was removed successfully, false otherwise. Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)