org.apache.karaf.main
Class DefaultJDBCLock

java.lang.Object
  org.apache.karaf.main.DefaultJDBCLock

All Implemented Interfaces:

Lock

Direct Known Subclasses:

DerbyJDBCLock, MySQLJDBCLock, OracleJDBCLock

public class DefaultJDBCLock
extends java.lang.Object
implements Lock

Represents an exclusive lock on a database, used to avoid multiple Karaf instances attempting to become master.

Version:

$Revision: $

Constructor Summary

DefaultJDBCLock(java.util.Properties props)

Method Summary

boolean	isAlive() Indicates whether or not the lock still exists.
boolean	lock() A KeepAlive function to maintain the lock.
void	release() Terminate the lock connection safely.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultJDBCLock

public DefaultJDBCLock(java.util.Properties props)

Method Detail

lock

public boolean lock()

Description copied from interface: Lock

A KeepAlive function to maintain the lock. Indicates whether or not the lock could be aquired.

Specified by:

lock in interface Lock

Returns:

true if connection lock retained, false otherwise.

release

public void release()
             throws java.lang.Exception

Description copied from interface: Lock

Terminate the lock connection safely.

Specified by:

release in interface Lock

Throws:

java.lang.Exception

isAlive

public boolean isAlive()
                throws java.lang.Exception

Description copied from interface: Lock

Indicates whether or not the lock still exists.

Specified by:

isAlive in interface Lock

Returns:

true, if the lock still exists, otherwise false.

Throws:

java.lang.Exception