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.LeaseDatabaseLocker

All Implemented Interfaces:

Locker, Service

public class LeaseDatabaseLocker
extends AbstractLocker

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

Field Summary

protected javax.sql.DataSource	dataSource
protected long	diffFromCurrentTime
protected boolean	handleStartException
protected java.lang.String	leaseHolderId
protected int	maxAllowableDiffFromDBTime
protected int	queryTimeout
protected Statements	statements
protected boolean	stopping

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

DEFAULT_LOCK_ACQUIRE_SLEEP_INTERVAL, failIfLocked, lockAcquireSleepInterval, name

Constructor Summary

LeaseDatabaseLocker()

Method Summary

void	configure(PersistenceAdapter adapter)
protected long	determineTimeDifference(java.sql.Connection connection)
void	doStart()
void	doStop(ServiceStopper stopper)
java.lang.String	getLeaseHolderId()
long	getLockAcquireSleepInterval()
int	getMaxAllowableDiffFromDBTime()
int	getQueryTimeout()
protected long	initTimeDiff(java.sql.Connection connection)
boolean	isHandleStartException()
boolean	keepAlive()
void	setHandleStartException(boolean handleStartException)
void	setLeaseHolderId(java.lang.String leaseHolderId)
void	setLockAcquireSleepInterval(long lockAcquireSleepInterval)
void	setMaxAllowableDiffFromDBTime(int maxAllowableDiffFromDBTime)
void	setQueryTimeout(int queryTimeout)
java.lang.String	toString()

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

setFailIfLocked, setName

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

addServiceListener, dispose, isStarted, isStopped, isStopping, postStop, preStart, 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

dataSource

protected javax.sql.DataSource dataSource

statements

protected Statements statements

stopping

protected boolean stopping

maxAllowableDiffFromDBTime

protected int maxAllowableDiffFromDBTime

diffFromCurrentTime

protected long diffFromCurrentTime

leaseHolderId

protected java.lang.String leaseHolderId

queryTimeout

protected int queryTimeout

handleStartException

protected boolean handleStartException

Constructor Detail

LeaseDatabaseLocker

public LeaseDatabaseLocker()

Method Detail

configure

public void configure(PersistenceAdapter adapter)
               throws java.io.IOException

Throws:

java.io.IOException

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

Specified by:

keepAlive in interface Locker

Overrides:

keepAlive in class AbstractLocker

Throws:

java.io.IOException

getLockAcquireSleepInterval

public long getLockAcquireSleepInterval()

setLockAcquireSleepInterval

public void setLockAcquireSleepInterval(long lockAcquireSleepInterval)

Specified by:

setLockAcquireSleepInterval in interface Locker

Overrides:

setLockAcquireSleepInterval in class AbstractLocker

getQueryTimeout

public int getQueryTimeout()

setQueryTimeout

public void setQueryTimeout(int queryTimeout)

getLeaseHolderId

public java.lang.String getLeaseHolderId()

setLeaseHolderId

public void setLeaseHolderId(java.lang.String leaseHolderId)

getMaxAllowableDiffFromDBTime

public int getMaxAllowableDiffFromDBTime()

setMaxAllowableDiffFromDBTime

public void setMaxAllowableDiffFromDBTime(int maxAllowableDiffFromDBTime)

isHandleStartException

public boolean isHandleStartException()

setHandleStartException

public void setHandleStartException(boolean handleStartException)

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object