org.apache.activemq.store.jdbc

Class LeaseDatabaseLocker

java.lang.Object

org.apache.activemq.util.ServiceSupport

org.apache.activemq.broker.AbstractLocker

org.apache.activemq.store.jdbc.AbstractJDBCLocker

org.apache.activemq.store.jdbc.LeaseDatabaseLocker

All Implemented Interfaces:

Locker, Service

public class LeaseDatabaseLocker
extends AbstractJDBCLocker

Represents an exclusive lease on a database to avoid multiple brokers running against the same logical database.

Field Summary

Fields

Modifier and Type	Field and Description
protected long	diffFromCurrentTime
protected java.lang.String	leaseHolderId
protected int	maxAllowableDiffFromDBTime

Fields inherited from class org.apache.activemq.store.jdbc.AbstractJDBCLocker

createTablesOnStartup, dataSource, jdbcAdapter, queryTimeout

Fields inherited from class org.apache.activemq.broker.AbstractLocker

DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL, failIfLocked, lockable, lockAcquireSleepInterval, name

Constructor Summary

Constructors

Constructor and Description
LeaseDatabaseLocker()

Method Summary

Methods

Modifier and Type	Method and Description
protected long	determineTimeDifference(java.sql.Connection connection)
void	doStart()
void	doStop(ServiceStopper stopper)
java.lang.String	getLeaseHolderId()
int	getMaxAllowableDiffFromDBTime()
protected long	initTimeDiff(java.sql.Connection connection)
boolean	keepAlive() Used by a timer to keep alive the lock.
void	setLeaseHolderId(java.lang.String leaseHolderId)
void	setMaxAllowableDiffFromDBTime(int maxAllowableDiffFromDBTime)
java.lang.String	toString()

Methods inherited from class org.apache.activemq.store.jdbc.AbstractJDBCLocker

close, close, configure, getConnection, getQueryTimeout, getStatements, preStart, setCreateTablesOnStartup, setDataSource, setQueryTimeout, setQueryTimeout, setStatements

Methods inherited from class org.apache.activemq.broker.AbstractLocker

getLockAcquireSleepInterval, setFailIfLocked, setLockable, setLockAcquireSleepInterval, setName

Methods inherited from class org.apache.activemq.util.ServiceSupport

addServiceListener, dispose, isStarted, isStopped, isStopping, postStop, removeServiceListener, start, stop

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.activemq.Service

start, stop

Field Detail

maxAllowableDiffFromDBTime

protected int maxAllowableDiffFromDBTime

diffFromCurrentTime

protected long diffFromCurrentTime

leaseHolderId

protected java.lang.String leaseHolderId

Constructor Detail

LeaseDatabaseLocker

public LeaseDatabaseLocker()

Method Detail

doStart

public void doStart()
             throws java.lang.Exception

Specified by:

doStart in class ServiceSupport

Throws:

java.lang.Exception

initTimeDiff

protected long initTimeDiff(java.sql.Connection connection)
                     throws java.sql.SQLException

Throws:

java.sql.SQLException

determineTimeDifference

protected long determineTimeDifference(java.sql.Connection connection)
                                throws java.sql.SQLException

Throws:

java.sql.SQLException

doStop

public void doStop(ServiceStopper stopper)
            throws java.lang.Exception

Specified by:

doStop in class ServiceSupport

Throws:

java.lang.Exception

keepAlive

public boolean keepAlive()
                  throws java.io.IOException

Description copied from interface: Locker

Used by a timer to keep alive the lock. If the method returns false the broker should be terminated if an exception is thrown, the lock state cannot be determined

Specified by:

keepAlive in interface Locker

Overrides:

keepAlive in class AbstractLocker

Throws:

java.io.IOException

getLeaseHolderId

public java.lang.String getLeaseHolderId()

setLeaseHolderId

public void setLeaseHolderId(java.lang.String leaseHolderId)

getMaxAllowableDiffFromDBTime

public int getMaxAllowableDiffFromDBTime()

setMaxAllowableDiffFromDBTime

public void setMaxAllowableDiffFromDBTime(int maxAllowableDiffFromDBTime)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object