org.apache.openjpa.enhance

Class PCDataGenerator

java.lang.Object

org.apache.openjpa.enhance.DynamicStorageGenerator

org.apache.openjpa.enhance.PCDataGenerator

Direct Known Subclasses:

DataCachePCDataGenerator

public class PCDataGenerator
extends DynamicStorageGenerator

Generates PCData instances which avoid primitive wrappers to optimize memory use and performance at the cost of slightly higher startup time.

Since:

0.3.2

Author:

Steve Kim

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static interface	PCDataGenerator.DynamicPCData Dynamic PCDatas generated will implement this interface to simplify initialization.

Field Summary

Fields

Modifier and Type	Field and Description
protected static String	POSTFIX

Fields inherited from class org.apache.openjpa.enhance.DynamicStorageGenerator

POLICY_EMPTY, POLICY_EXCEPTION, POLICY_SILENT

Constructor Summary

Constructors

Constructor and Description
PCDataGenerator(OpenJPAConfiguration conf)

Method Summary

Methods

Modifier and Type	Method and Description
protected void	addVersionMethods(serp.bytecode.BCClass bc) Add methods for loading and storing version data.
protected void	callAbstractPCData(serp.bytecode.BCClass bc, String name, Class<?> retType, Class<?>[] args) Add method which defers to AbstractPCData.
protected void	declareClasses(serp.bytecode.BCClass bc) Add interface or superclass declarations to the generated class.
protected void	decorate(serp.bytecode.BCClass bc, ClassMetaData meta) Apply additional decoration to generated class.
protected void	decorate(Object obj, serp.bytecode.BCClass bc, int[] types) Decorate the generated class.
protected void	finish(PCDataGenerator.DynamicPCData data, ClassMetaData meta) Perform any final actions before the pcdata is returned to client code.
PCData	generatePCData(Object oid, ClassMetaData meta) Return a PCData instance for the given oid and metadata.
protected String	getClassName(Object obj) Return a class name to use for the given user key.
OpenJPAConfiguration	getConfiguration() Return the configuration.
protected int	getCreateFieldMethods(int typeCode) Return the policy constant for how to create type methods.
protected String	getUniqueName(Class<?> type) Creates a unique name for the given type's pcdata implementation.
protected int	replaceType(FieldMetaData fmd) Return a valid JavaTypes constant for the given field
protected void	setTarget(serp.bytecode.Instruction ins, Collection<serp.bytecode.Instruction> jumps) Set the collection of JumpInstructions to the given instruction, clearing the collection in the process.
protected boolean	usesImplData(ClassMetaData meta) Whether the given type might have cacheable class-level impl data.
protected boolean	usesImplData(FieldMetaData fmd) Whether the given field might have cacheable impl data.
protected boolean	usesIntermediate(FieldMetaData fmd) Whether the given field uses a cacheable intermediate value.

Methods inherited from class org.apache.openjpa.enhance.DynamicStorageGenerator

addBeanField, createFactory, forType, generateStorage, getFieldAccess, getFieldName, getWrapper, getWrapper, isCompatible, replaceMethod, throwException

Methods inherited from class java.lang.Object

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

Field Detail

POSTFIX

protected static final String POSTFIX

See Also:

Constant Field Values

Constructor Detail

PCDataGenerator

public PCDataGenerator(OpenJPAConfiguration conf)

Method Detail

getConfiguration

public OpenJPAConfiguration getConfiguration()

Return the configuration.

generatePCData

public PCData generatePCData(Object oid,
                    ClassMetaData meta)

Return a PCData instance for the given oid and metadata.

finish

protected void finish(PCDataGenerator.DynamicPCData data,
          ClassMetaData meta)

Perform any final actions before the pcdata is returned to client code.

getCreateFieldMethods

protected int getCreateFieldMethods(int typeCode)

Description copied from class: DynamicStorageGenerator

Return the policy constant for how to create type methods.

Overrides:

getCreateFieldMethods in class DynamicStorageGenerator

declareClasses

protected void declareClasses(serp.bytecode.BCClass bc)

Description copied from class: DynamicStorageGenerator

Add interface or superclass declarations to the generated class.

Overrides:

declareClasses in class DynamicStorageGenerator

getClassName

protected final String getClassName(Object obj)

Description copied from class: DynamicStorageGenerator

Return a class name to use for the given user key. By default, returns the stringified key prefixed by PREFIX.

Overrides:

getClassName in class DynamicStorageGenerator

getUniqueName

protected String getUniqueName(Class<?> type)

Creates a unique name for the given type's pcdata implementation.

decorate

protected final void decorate(Object obj,
            serp.bytecode.BCClass bc,
            int[] types)

Description copied from class: DynamicStorageGenerator

Decorate the generated class.

Overrides:

decorate in class DynamicStorageGenerator

decorate

protected void decorate(serp.bytecode.BCClass bc,
            ClassMetaData meta)

Apply additional decoration to generated class.

addVersionMethods

protected void addVersionMethods(serp.bytecode.BCClass bc)

Add methods for loading and storing version data.

replaceType

protected int replaceType(FieldMetaData fmd)

Return a valid JavaTypes constant for the given field

usesIntermediate

protected boolean usesIntermediate(FieldMetaData fmd)

Whether the given field uses a cacheable intermediate value.

usesImplData

protected boolean usesImplData(ClassMetaData meta)

Whether the given type might have cacheable class-level impl data.

usesImplData

protected boolean usesImplData(FieldMetaData fmd)

Whether the given field might have cacheable impl data.

callAbstractPCData

protected void callAbstractPCData(serp.bytecode.BCClass bc,
                      String name,
                      Class<?> retType,
                      Class<?>[] args)

Add method which defers to AbstractPCData.

setTarget

protected void setTarget(serp.bytecode.Instruction ins,
             Collection<serp.bytecode.Instruction> jumps)

Set the collection of JumpInstructions to the given instruction, clearing the collection in the process.