org.apache.openjpa.jdbc.kernel

Class AbstractJDBCSeq

java.lang.Object

org.apache.openjpa.jdbc.kernel.AbstractJDBCSeq

All Implemented Interfaces:

JDBCSeq, Seq, Closeable

Direct Known Subclasses:

NativeJDBCSeq, TableJDBCSeq

public abstract class AbstractJDBCSeq
extends Object
implements JDBCSeq

Abstract sequence implementation. Handles obtaining the proper connection to used based on whether the sequence is transactional and whether a second datasource is configured.

Author:

Abe White

Field Summary

Fields

Modifier and Type	Field and Description
protected Object	current
protected int	type

Fields inherited from interface org.apache.openjpa.kernel.Seq

TYPE_CONTIGUOUS, TYPE_DEFAULT, TYPE_NONTRANSACTIONAL, TYPE_TRANSACTIONAL

Constructor Summary

Constructors

Constructor and Description
AbstractJDBCSeq()

Method Summary

Modifier and Type	Method and Description
void	addSchema(ClassMapping mapping, SchemaGroup group) No-op.
void	allocate(int additional, StoreContext ctx, ClassMetaData meta) Allocate additional values efficiently.
protected void	allocateInternal(int additional, JDBCStore store, ClassMapping mapping) Allocate additional sequence values.
void	close() No-op.
protected void	closeConnection(Connection conn) Close the current connection.
Object	current(StoreContext ctx, ClassMetaData meta) Return the current value of the sequence, or null if not available.
protected Object	currentInternal(JDBCStore store, ClassMapping mapping) Return the current sequence object.
abstract JDBCConfiguration	getConfiguration() Return the JDBCConfiguration for this sequence.
protected Connection	getConnection(JDBCStore store) Return the connection to use based on the type of sequence.
Object	next(StoreContext ctx, ClassMetaData meta) Return the next value in the sequence.
protected abstract Object	nextInternal(JDBCStore store, ClassMapping mapping) Return the next sequence object.
void	setType(int type) Records the sequence type.
protected boolean	suspendInJTA() Detect whether or not OpenJPA should suspend the transaction in a managed environment.

Methods inherited from class java.lang.Object

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

Field Detail

type

protected int type

current

protected Object current

Constructor Detail

AbstractJDBCSeq

public AbstractJDBCSeq()

Method Detail

setType

public void setType(int type)

Records the sequence type.

Specified by:

setType in interface Seq

next

public Object next(StoreContext ctx,
                   ClassMetaData meta)

Description copied from interface: Seq

Return the next value in the sequence.

Specified by:

next in interface Seq

Parameters:

ctx - the current context

meta - if this is a datastore identity sequence, the persistent class the identity value is for; else null

current

public Object current(StoreContext ctx,
                      ClassMetaData meta)

Description copied from interface: Seq

Return the current value of the sequence, or null if not available.

Specified by:

current in interface Seq

Parameters:

ctx - the current context

meta - if this is a datastore identity sequence, the persistent class the identity value is for; else null

allocate

public void allocate(int additional,
                     StoreContext ctx,
                     ClassMetaData meta)

Description copied from interface: Seq

Allocate additional values efficiently.

Specified by:

allocate in interface Seq

ctx - the current context

meta - if this is a datastore identity sequence, the persistent class the identity value is for; else null

addSchema

public void addSchema(ClassMapping mapping,
                      SchemaGroup group)

No-op.

Specified by:

addSchema in interface JDBCSeq

close

public void close()

No-op.

Specified by:

close in interface Seq

Specified by:

close in interface Closeable

nextInternal

protected abstract Object nextInternal(JDBCStore store,
                                       ClassMapping mapping)
                                throws Exception

Return the next sequence object.

Throws:

Exception

getConfiguration

public abstract JDBCConfiguration getConfiguration()

Return the JDBCConfiguration for this sequence.

currentInternal

protected Object currentInternal(JDBCStore store,
                                 ClassMapping mapping)
                          throws Exception

Return the current sequence object. By default returns the last sequence value used, or null if no sequence values have been requested yet. Default implementation is not threadsafe.

Throws:

Exception

allocateInternal

protected void allocateInternal(int additional,
                                JDBCStore store,
                                ClassMapping mapping)
                         throws Exception

Allocate additional sequence values. Does nothing by default.

Throws:

Exception

getConnection

protected Connection getConnection(JDBCStore store)
                            throws SQLException

Return the connection to use based on the type of sequence. This connection will automatically be closed; do not close it.

Returns:

If the sequence type is TYPE_TRANSACTIONAL or TYPE_CONTIGUOUS the connection from the StoreManager will be returned.

Otherwise a new connection will be obtained using DataSource2 from the current configuration. In this case autocommit is set to false prior to returning the connection.

Throws:

SQLException

closeConnection

protected void closeConnection(Connection conn)

Close the current connection. If the sequence is TYPE_TRANSACTIONAL or TYPE_CONTIGUOUS we will decrement the ref count. Otherwise the connection will be committed and then closed.

suspendInJTA

protected boolean suspendInJTA()

Detect whether or not OpenJPA should suspend the transaction in a managed environment.