DefaultDatabaseLocker (ActiveMQ :: JDBC Store 5.17.0 API)

java.lang.Object
- org.apache.activemq.util.ServiceSupport
- - org.apache.activemq.broker.AbstractLocker
  - - org.apache.activemq.store.jdbc.AbstractJDBCLocker
    - - org.apache.activemq.store.jdbc.DefaultDatabaseLocker

All Implemented Interfaces:

Locker, org.apache.activemq.Service

Direct Known Subclasses:

TransactDatabaseLocker
```
public class DefaultDatabaseLocker
extends AbstractJDBCLocker
```
Represents an exclusive lock on a database to avoid multiple brokers running against the same logical database.

Field Summary

Fields
Modifier and Type	Field	Description
`protected Connection`	`connection`
`protected Handler<Exception>`	`exceptionHandler`
`protected PreparedStatement`	`lockCreateStatement`
`protected PreparedStatement`	`lockUpdateStatement`

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 Description

DefaultDatabaseLocker()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`doStart()`
`void`	`doStop(ServiceStopper stopper)`
`Handler`	`getExceptionHandler()`
`long`	`getLockAcquireSleepInterval()`
`boolean`	`keepAlive()`
`void`	`setExceptionHandler(Handler exceptionHandler)`
`void`	`setLockAcquireSleepInterval(long lockAcquireSleepInterval)`

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
setFailIfLocked, setLockable, 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, toString, wait, wait, wait

Methods inherited from interface org.apache.activemq.Service
start, stop

Field Detail

lockCreateStatement

protected volatile PreparedStatement lockCreateStatement

lockUpdateStatement

protected volatile PreparedStatement lockUpdateStatement

connection

protected volatile Connection connection

exceptionHandler

protected Handler<Exception> exceptionHandler

Constructor Detail
- DefaultDatabaseLocker
```
public DefaultDatabaseLocker()
```

Method Detail
- doStart
```
public void doStart()
             throws Exception
```
  Specified by:
  
  doStart in class ServiceSupport
  
  Throws:
  
  Exception
- doStop
```
public void doStop(ServiceStopper stopper)
            throws Exception
```
  Specified by:
  
  doStop in class ServiceSupport
  
  Throws:
  
  Exception
- keepAlive
```
public boolean keepAlive()
                  throws IOException
```
  Specified by:
  
  keepAlive in interface Locker
  
  Overrides:
  
  keepAlive in class AbstractLocker
  
  Throws:
  
  IOException
- getLockAcquireSleepInterval
```
public long getLockAcquireSleepInterval()
```
  Overrides:
  
  getLockAcquireSleepInterval in class AbstractLocker
- setLockAcquireSleepInterval
```
public void setLockAcquireSleepInterval(long lockAcquireSleepInterval)
```
  Specified by:
  
  setLockAcquireSleepInterval in interface Locker
  
  Overrides:
  
  setLockAcquireSleepInterval in class AbstractLocker
- getExceptionHandler
```
public Handler getExceptionHandler()
```
- setExceptionHandler
```
public void setExceptionHandler(Handler exceptionHandler)
```