com.avaje.ebean.config.dbplatform
Class SequenceIdGenerator

java.lang.Object
  com.avaje.ebean.config.dbplatform.SequenceIdGenerator

All Implemented Interfaces:

IdGenerator

Direct Known Subclasses:

DB2SequenceIdGenerator, H2SequenceIdGenerator, OracleSequenceIdGenerator, PostgresSequenceIdGenerator

public abstract class SequenceIdGenerator
extends Object
implements IdGenerator

Database sequence based IdGenerator.

Field Summary

Fields inherited from interface com.avaje.ebean.config.dbplatform.IdGenerator

AUTO_UUID

Constructor Summary

SequenceIdGenerator(BackgroundExecutor be, DataSource ds, String seqName, int batchSize)
Construct given a dataSource and sql to return the next sequence value.

Method Summary

String	getName() Returns the sequence name.
abstract String	getSql(int batchSize)
boolean	isDbSequence() Returns true.
Object	nextId() Return the next Id.
void	preAllocateIds(int allocateSize) If allocateSize is large load some sequences in a background thread.

Methods inherited from class java.lang.Object

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

Constructor Detail

SequenceIdGenerator

public SequenceIdGenerator(BackgroundExecutor be,
                           DataSource ds,
                           String seqName,
                           int batchSize)

Construct given a dataSource and sql to return the next sequence value.

Method Detail

getSql

public abstract String getSql(int batchSize)

getName

public String getName()

Returns the sequence name.

Specified by:

getName in interface IdGenerator

isDbSequence

public boolean isDbSequence()

Returns true.

Specified by:

isDbSequence in interface IdGenerator

preAllocateIds

public void preAllocateIds(int allocateSize)

If allocateSize is large load some sequences in a background thread.

For example, when inserting a bean with a cascade on a OneToMany with many beans Ebean can call this to ensure .

Specified by:

preAllocateIds in interface IdGenerator

nextId

public Object nextId()

Return the next Id.

Specified by:

nextId in interface IdGenerator