Module io.ebean.api

Package io.ebean.config.dbplatform

Class SequenceIdGenerator

java.lang.Object

io.ebean.config.dbplatform.SequenceIdGenerator

All Implemented Interfaces:

PlatformIdGenerator

Direct Known Subclasses:

SequenceBatchIdGenerator, SequenceStepIdGenerator

public abstract class SequenceIdGenerator
extends Object
implements PlatformIdGenerator

Database sequence based IdGenerator.

Field Summary

Fields

Modifier and Type	Field	Description
protected int	allocationSize
protected BackgroundExecutor	backgroundExecutor
protected AtomicBoolean	currentlyBackgroundLoading
protected DataSource	dataSource
protected NavigableSet<Long>	idList
protected static org.slf4j.Logger	log
protected String	seqName

Fields inherited from interface io.ebean.config.dbplatform.PlatformIdGenerator

AUTO_UUID

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
protected List<Long>	getMoreIds(int requestSize)	Get more Id's by executing a query and reading the Id's returned.
String	getName()	Returns the sequence name.
abstract String	getSql(int batchSize)
boolean	isDbSequence()	Returns true.
protected void	loadInBackground(int requestSize)	Load another batch of Id's using a background thread.
Object	nextId(Transaction t)	Return the next Id.
void	preAllocateIds(int requestSize)	If allocateSize is large load some sequences in a background thread.
protected abstract List<Long>	readIds(ResultSet resultSet, int loadSize)	Read the resultSet returning the list of Id values.

Methods inherited from class java.lang.Object

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

Field Detail

log

protected static final org.slf4j.Logger log

seqName

protected final String seqName

dataSource

protected final DataSource dataSource

backgroundExecutor

protected final BackgroundExecutor backgroundExecutor

idList

protected final NavigableSet<Long> idList

allocationSize

protected final int allocationSize

currentlyBackgroundLoading

protected AtomicBoolean currentlyBackgroundLoading

Constructor Detail

SequenceIdGenerator

protected SequenceIdGenerator(BackgroundExecutor be,
                              DataSource ds,
                              String seqName,
                              int allocationSize)

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 PlatformIdGenerator

isDbSequence

public boolean isDbSequence()

Returns true.

Specified by:

isDbSequence in interface PlatformIdGenerator

preAllocateIds

public void preAllocateIds(int requestSize)

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 PlatformIdGenerator

nextId

public Object nextId(Transaction t)

Return the next Id.

If a Transaction has been passed in use the Connection from it.

Specified by:

nextId in interface PlatformIdGenerator

loadInBackground

protected void loadInBackground(int requestSize)

Load another batch of Id's using a background thread.

readIds

protected abstract List<Long> readIds(ResultSet resultSet,
                                      int loadSize)
                               throws SQLException

Read the resultSet returning the list of Id values.

Throws:

SQLException

getMoreIds

protected List<Long> getMoreIds(int requestSize)

Get more Id's by executing a query and reading the Id's returned.