org.databene.platform.db
Class OfflineSequenceGenerator

java.lang.Object
  org.databene.benerator.util.AbstractGenerator<E>
      org.databene.benerator.util.ThreadSafeGenerator<java.lang.Long>
          org.databene.platform.db.OfflineSequenceGenerator

All Implemented Interfaces:

java.io.Closeable, Generator<java.lang.Long>, org.databene.commons.Resettable, org.databene.commons.ThreadAware

public class OfflineSequenceGenerator
extends ThreadSafeGenerator<java.lang.Long>

Reads the current value of a sequence on first invocation, increases the value locally on subsequent calls and finally (on close()) updates the DB sequence with the local value. This saves database round trips but limits execution to a single client.

Created: 11.11.2009 18:35:26

Since:

0.6.0

Author:

Volker Bergmann

Field Summary

Fields inherited from class org.databene.benerator.util.AbstractGenerator

context, state

Constructor Summary

OfflineSequenceGenerator()

OfflineSequenceGenerator(DBSystem target, java.lang.String sequenceName)

Method Summary

void	close() Closes the generator.
java.lang.Long	generate() Returns an instance of the generic type E.
java.lang.Class<java.lang.Long>	getGeneratedType() Declares the type of the objects returned by the generate() method.
java.lang.String	getSequenceName()
DBSystem	getTarget()
void	init(GeneratorContext context)
void	setSequenceName(java.lang.String sequenceName)
void	setTarget(DBSystem target)

Methods inherited from class org.databene.benerator.util.ThreadSafeGenerator

isParallelizable, isThreadSafe

Methods inherited from class org.databene.benerator.util.AbstractGenerator

assertInitialized, assertNotInitialized, reset, toString, wasInitialized

Methods inherited from class java.lang.Object

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

Constructor Detail

OfflineSequenceGenerator

public OfflineSequenceGenerator()

OfflineSequenceGenerator

public OfflineSequenceGenerator(DBSystem target,
                                java.lang.String sequenceName)

Method Detail

getTarget

public DBSystem getTarget()

setTarget

public void setTarget(DBSystem target)

getSequenceName

public java.lang.String getSequenceName()

setSequenceName

public void setSequenceName(java.lang.String sequenceName)

init

public void init(GeneratorContext context)

Specified by:

init in interface Generator<java.lang.Long>

Overrides:

init in class AbstractGenerator<java.lang.Long>

getGeneratedType

public java.lang.Class<java.lang.Long> getGeneratedType()

Description copied from interface: Generator

Declares the type of the objects returned by the generate() method.

generate

public java.lang.Long generate()

Description copied from interface: Generator

Returns an instance of the generic type E.

close

public void close()

Description copied from interface: Generator

Closes the generator. After invocation the state is unavailable.

Specified by:

close in interface java.io.Closeable

Specified by:

close in interface Generator<java.lang.Long>

Overrides:

close in class AbstractGenerator<java.lang.Long>