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org.apache.avalon.excalibur.datasource.ids
Class AbstractDataSourceBlockIdGenerator

java.lang.Object
  org.apache.avalon.framework.logger.AbstractLogEnabled
      org.apache.avalon.excalibur.datasource.ids.AbstractIdGenerator
          org.apache.avalon.excalibur.datasource.ids.AbstractDataSourceIdGenerator
              org.apache.avalon.excalibur.datasource.ids.AbstractDataSourceBlockIdGenerator

All Implemented Interfaces:

Component, Configurable, Disposable, IdGenerator, Initializable, LogEnabled, Serviceable, ThreadSafe

Direct Known Subclasses:

TableIdGenerator

public abstract class AbstractDataSourceBlockIdGenerator

extends AbstractDataSourceIdGenerator

The AbstractDataSourceBlockIdGenerator allocates blocks of ids from a DataSource and then provides them as needed. This is useful in reducing communication with the DataSource.

Since:

4.1

Version:

CVS $Revision: 1.4 $ $Date: 2004/02/28 11:47:17 $

Author:

Avalon Development Team

Field Summary

Fields inherited from class org.apache.avalon.excalibur.datasource.ids.AbstractDataSourceIdGenerator

m_dataSource, m_nextId

Fields inherited from interface org.apache.avalon.excalibur.datasource.ids.IdGenerator

ROLE

Constructor Summary

AbstractDataSourceBlockIdGenerator()

Method Summary

protected abstract java.math.BigDecimal	allocateBigDecimalIdBlock(int blockSize) Allocates a block, of the given size, of ids from the database.
protected abstract long	allocateLongIdBlock(int blockSize) Allocates a block, of the given size, of ids from the database.
void	configure(Configuration configuration) Called by the Container to configure the component.
protected java.math.BigDecimal	getNextBigDecimalIdInner() Gets the next id as a Big Decimal.
protected long	getNextLongIdInner() Gets the next id as a long.
void	initialize() Called by the Container to initialize the component.

Methods inherited from class org.apache.avalon.excalibur.datasource.ids.AbstractDataSourceIdGenerator

dispose, getConnection, service

Methods inherited from class org.apache.avalon.excalibur.datasource.ids.AbstractIdGenerator

getNextBigDecimalId, getNextByteId, getNextIntegerId, getNextLongId, getNextLongIdChecked, getNextShortId, isUsingBigDecimals, setUseBigDecimals

Methods inherited from class org.apache.avalon.framework.logger.AbstractLogEnabled

enableLogging, getLogger, setupLogger, setupLogger, setupLogger

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDataSourceBlockIdGenerator

public AbstractDataSourceBlockIdGenerator()

Method Detail

allocateBigDecimalIdBlock

protected abstract java.math.BigDecimal allocateBigDecimalIdBlock(int blockSize)
                                                           throws IdException

Allocates a block, of the given size, of ids from the database.

Parameters:

blockSize - number of Ids which are to be allocated.

Returns:

The first id in the allocated block.

Throws:

IdException - if there it was not possible to allocate a block of ids.

allocateLongIdBlock

protected abstract long allocateLongIdBlock(int blockSize)
                                     throws IdException

Allocates a block, of the given size, of ids from the database.

Parameters:

blockSize - number of Ids which are to be allocated.

Returns:

The first id in the allocated block.

Throws:

IdException - if there it was not possible to allocate a block of ids.

getNextBigDecimalIdInner

protected java.math.BigDecimal getNextBigDecimalIdInner()
                                                 throws IdException

Gets the next id as a Big Decimal. This method will only be called when synchronized and when the data type is configured to be BigDecimal.

Specified by:

getNextBigDecimalIdInner in class AbstractIdGenerator

Returns:

the next id as a BigDecimal.

Throws:

IdException - if an Id could not be allocated for any reason.

getNextLongIdInner

protected long getNextLongIdInner()
                           throws IdException

Gets the next id as a long. This method will only be called when synchronized and when the data type is configured to be long.

Specified by:

getNextLongIdInner in class AbstractIdGenerator

Returns:

the next id as a long.

Throws:

IdException - if an Id could not be allocated for any reason.

configure

public void configure(Configuration configuration)
               throws ConfigurationException

Called by the Container to configure the component.

Specified by:

configure in interface Configurable

Overrides:

configure in class AbstractDataSourceIdGenerator

Parameters:

configuration - configuration info used to setup the component.

Throws:

ConfigurationException - if there are any problems with the configuration.

initialize

public void initialize()
                throws java.lang.Exception

Called by the Container to initialize the component.

Specified by:

initialize in interface Initializable

Overrides:

initialize in class AbstractDataSourceIdGenerator

Throws:

java.lang.Exception - if there were any problems durring initialization.