Package org.apache.openjpa.jdbc.meta.strats

Class StateComparisonVersionStrategy

java.lang.Object

org.apache.openjpa.jdbc.meta.strats.AbstractStrategy

org.apache.openjpa.jdbc.meta.strats.AbstractVersionStrategy

org.apache.openjpa.jdbc.meta.strats.StateComparisonVersionStrategy

All Implemented Interfaces:

Serializable, Strategy, VersionStrategy

public class StateComparisonVersionStrategy
extends AbstractVersionStrategy

Uses a state image to determine whether concurrency violations take place.

Author:

Abe White

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	StateComparisonVersionStrategy.CustomUpdate	Row implementation we use to pass to versionable mappings so they can set up the where conditions we need to add to update statements.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ALIAS

Fields inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractVersionStrategy

vers

Constructor Summary

Constructors

Constructor	Description
StateComparisonVersionStrategy()

Method Summary

Modifier and Type	Method	Description
void	afterLoad(OpenJPAStateManager sm, JDBCStore store)	This method is called after data is loaded into the instance, in case the version indicator works off of a state image.
boolean	checkVersion(OpenJPAStateManager sm, JDBCStore store, boolean updateVersion)	Checks the version of the given state manager with the version stored in memory.
int	compareVersion(Object v1, Object v2)
void	customInsert(OpenJPAStateManager sm, JDBCStore store)	This method is for class mappings that take over the insert process, but still want to use this indicator for optimistic locking.
StateComparisonVersionStrategy.CustomUpdate	customUpdate(OpenJPAStateManager sm, JDBCStore store, Table table, boolean record)	This method is for class mappings that take over the update process, but still want to use this indicator for optimistic locking.
String	getAlias()	Return the alias of this strategy.
void	insert(OpenJPAStateManager sm, JDBCStore store, RowManager rm)	Set values for the mapping into the proper rows.
void	map(boolean adapt)	Map the owning mapping using this strategy.
void	update(OpenJPAStateManager sm, JDBCStore store, RowManager rm)	Set values for the mapping into the proper rows.

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractVersionStrategy

getBulkUpdateValues, load, load, select, setVersion

Methods inherited from class org.apache.openjpa.jdbc.meta.strats.AbstractStrategy

customDelete, customUpdate, delete, initialize, isCustomDelete, isCustomInsert, isCustomUpdate

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.openjpa.jdbc.meta.Strategy

customDelete, customUpdate, delete, initialize, isCustomDelete, isCustomInsert, isCustomUpdate

Field Details

ALIAS

public static final String ALIAS

See Also:

• Constant Field Values

Constructor Details

StateComparisonVersionStrategy

public StateComparisonVersionStrategy()

Method Details

getAlias

public String getAlias()

Description copied from interface: Strategy

Return the alias of this strategy. For custom strategies, return the full class name.

Specified by:

getAlias in interface Strategy

Overrides:

getAlias in class AbstractStrategy

map

public void map(boolean adapt)

Description copied from interface: Strategy

Map the owning mapping using this strategy.

Specified by:

map in interface Strategy

Overrides:

map in class AbstractStrategy

Parameters:

adapt - if true, use the owning mapping's raw mapping info to set its ORM data; if false, ORM data will already be set

insert

public void insert(OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm)
            throws SQLException

Description copied from interface: Strategy

Set values for the mapping into the proper rows. For class mappings, this method will be called only after the corresponding method has been called for all fields of this mapping.

Specified by:

insert in interface Strategy

Overrides:

insert in class AbstractStrategy

Throws:

SQLException

customInsert

public void customInsert(OpenJPAStateManager sm,
 JDBCStore store)
                  throws SQLException

This method is for class mappings that take over the insert process, but still want to use this indicator for optimistic locking.

Specified by:

customInsert in interface Strategy

Overrides:

customInsert in class AbstractStrategy

Throws:

SQLException

update

public void update(OpenJPAStateManager sm,
 JDBCStore store,
 RowManager rm)
            throws SQLException

Description copied from interface: Strategy

Set values for the mapping into the proper rows.

Specified by:

update in interface Strategy

Overrides:

update in class AbstractStrategy

Throws:

SQLException

See Also:

• Strategy.insert(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.jdbc.kernel.JDBCStore, org.apache.openjpa.jdbc.sql.RowManager)

customUpdate

public StateComparisonVersionStrategy.CustomUpdate customUpdate(OpenJPAStateManager sm,
 JDBCStore store,
 Table table,
 boolean record)
                                                         throws SQLException

This method is for class mappings that take over the update process, but still want to use this indicator for optimistic locking.

Parameters:

sm - the instance to test

store - store manager context

table - only state image values in this table will be tested; if the custom mapping uses different updates for different tables, this method can be called multiple times for the multiple tables

record - set this parameter to true the last time you call this method, so the indicator can setup the next version of the given state manager

Returns:

a StateComparisonVersionStrategy.CustomUpdate whose getSQL method yields a boolean SQL expression that tests whether the current record is equal to our recorded state image, and whose setParameters method parameterizes the given prepared statement with the values used in the above boolean expression

Throws:

SQLException

afterLoad

public void afterLoad(OpenJPAStateManager sm,
 JDBCStore store)

Description copied from interface: VersionStrategy

This method is called after data is loaded into the instance, in case the version indicator works off of a state image.

Specified by:

afterLoad in interface VersionStrategy

Overrides:

afterLoad in class AbstractVersionStrategy

checkVersion

public boolean checkVersion(OpenJPAStateManager sm,
 JDBCStore store,
 boolean updateVersion)
                     throws SQLException

Description copied from interface: VersionStrategy

Checks the version of the given state manager with the version stored in memory.

Specified by:

checkVersion in interface VersionStrategy

Overrides:

checkVersion in class AbstractVersionStrategy

Returns:

true if the in-memory version was up-to-date, false otherwise

Throws:

SQLException

compareVersion

public int compareVersion(Object v1,
 Object v2)

Specified by:

compareVersion in interface VersionStrategy

Overrides:

compareVersion in class AbstractVersionStrategy

See Also:

• StoreManager.compareVersion(org.apache.openjpa.kernel.OpenJPAStateManager, java.lang.Object, java.lang.Object)