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CMPFilePersistenceManager (JBoss Server API) - JBoss 4.0.1 sp1 server API Documentation 英文版文档

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org.jboss.ejb.plugins
Class CMPFilePersistenceManager

java.lang.Object
  org.jboss.mx.util.JBossNotificationBroadcasterSupport
      org.jboss.system.ServiceMBeanSupport
          org.jboss.ejb.plugins.CMPFilePersistenceManager

All Implemented Interfaces:

AllowedOperationsFlags, ContainerPlugin, EntityPersistenceStore, javax.management.MBeanRegistration, javax.management.NotificationBroadcaster, javax.management.NotificationEmitter, org.jboss.system.Service, org.jboss.system.ServiceMBean

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public class CMPFilePersistenceManager

extends org.jboss.system.ServiceMBeanSupport

implements EntityPersistenceStore

A file-based CMP entity bean persistence manager.

Reads and writes entity bean objects to files by using the standard Java serialization mechanism.

Enitiy state files are stored under: jboss-server-data-dir/storeDirectoryName/ejb-name.

Note, currently the name of the entity must be unique across the server, or unless the store directory is changed, to avoid data collisions.

jason: disabled because XDoclet can not handle right now _@_jmx:mbean extends="org.jboss.system.ServiceMBean"

Version:

$Revision: 1.23 $

Author:

Rickard 锟絙erg, Marc Fleury, Jason Dillon

20010801 marc fleury:

• - insertion in cache upon create in now done in the instance interceptor

20011201 Dain Sundstrom:

• - added createBeanInstance and initEntity methods

20020525 Dain Sundstrom:

• - Replaced FinderResults with Collection
• - Removed unused method loadEntities

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Field Summary
static String	DEFAULT_STORE_DIRECTORY_NAME           The default store directory name ("entities").

 

Fields inherited from class org.jboss.system.ServiceMBeanSupport

log, server, SERVICE_CONTROLLER_SIG, serviceName

 

Fields inherited from interface org.jboss.ejb.AllowedOperationsFlags

IN_AFTER_BEGIN, IN_AFTER_COMPLETION, IN_BEFORE_COMPLETION, IN_BUSINESS_METHOD, IN_EJB_ACTIVATE, IN_EJB_CREATE, IN_EJB_FIND, IN_EJB_HOME, IN_EJB_LOAD, IN_EJB_PASSIVATE, IN_EJB_POST_CREATE, IN_EJB_REMOVE, IN_EJB_STORE, IN_EJB_TIMEOUT, IN_INTERCEPTOR_METHOD, IN_SERVICE_ENDPOINT_METHOD, IN_SET_ENTITY_CONTEXT, IN_SET_MESSAGE_DRIVEN_CONTEXT, IN_SET_SESSION_CONTEXT, IN_UNSET_ENTITY_CONTEXT, NOT_ALLOWED

 

Fields inherited from interface org.jboss.system.ServiceMBean

CREATE_EVENT, CREATED, DESTROY_EVENT, DESTROYED, FAILED, REGISTERED, START_EVENT, STARTED, STARTING, states, STOP_EVENT, STOPPED, STOPPING, UNREGISTERED

 

Constructor Summary

CMPFilePersistenceManager()

 

Method Summary
void	activateEntity(EntityEnterpriseContext ctx)           Non-operation.
Object	createBeanClassInstance()           Returns a new instance of the bean class or a subclass of the bean class.
Object	createEntity(Method m, Object[] args, EntityEnterpriseContext ctx)           This method is called whenever an entity is to be created.
protected  void	createService()
protected  void	destroyService()           Try to remove the store directory, if we can't then ignore.
Collection	findEntities(Method finderMethod, Object[] args, EntityEnterpriseContext ctx, GenericEntityObjectFactory factory)           This method is called when collections of entities are to be found.
Object	findEntity(Method finderMethod, Object[] args, EntityEnterpriseContext ctx, GenericEntityObjectFactory factory)           This method is called when single entities are to be found.
protected  File	getFile(Object id)
File	getStoreDirectory()           Returns the directory used to store entity state files.
String	getStoreDirectoryName()           Get the sub-directory name under the server data directory where entity data is stored.
void	initEntity(EntityEnterpriseContext ctx)           Reset all attributes to default value
boolean	isModified(EntityEnterpriseContext ctx)           This method is used to determined whether the instance was modified.
boolean	isStoreRequired(EntityEnterpriseContext ctx)           This method is used to determine if an entity should be stored.
void	loadEntity(EntityEnterpriseContext ctx)           This method is called whenever an entity shall be load from the underlying storage.
void	passivateEntity(EntityEnterpriseContext ctx)           Non-operation.
Object	postCreateEntity(Method m, Object[] args, EntityEnterpriseContext ctx)           This method is called after the createEntity.
void	removeEntity(EntityEnterpriseContext ctx)           This method is called when an entity shall be removed from the underlying storage.
void	setContainer(Container c)           Saves a reference to the EntityContainer for its bean type.
void	setStoreDirectoryName(String dirName)           Set the sub-directory name under the server data directory where entity data will be stored.
void	storeEntity(EntityEnterpriseContext ctx)           This method is called whenever an entity shall be stored to the underlying storage.

 

Methods inherited from class org.jboss.system.ServiceMBeanSupport

create, destroy, getLog, getName, getNextNotificationSequenceNumber, getObjectName, getServer, getServiceName, getState, getStateString, jbossInternalCreate, jbossInternalDescription, jbossInternalDestroy, jbossInternalLifecycle, jbossInternalStart, jbossInternalStop, postDeregister, postRegister, preDeregister, preRegister, start, startService, stop, stopService

 

Methods inherited from class org.jboss.mx.util.JBossNotificationBroadcasterSupport

addNotificationListener, getNotificationInfo, handleNotification, removeNotificationListener, removeNotificationListener, sendNotification

 

Methods inherited from class java.lang.Object

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

 

Methods inherited from interface org.jboss.system.Service

create, destroy, start, stop

 

Field Detail

DEFAULT_STORE_DIRECTORY_NAME

public static final String DEFAULT_STORE_DIRECTORY_NAME

The default store directory name ("entities").

See Also:

Constant Field Values

Constructor Detail

CMPFilePersistenceManager

public CMPFilePersistenceManager()

Method Detail

setContainer

public void setContainer(Container c)

Saves a reference to the EntityContainer for its bean type.

Specified by:

setContainer in interface ContainerPlugin

Parameters:

c - The container using this plugin. This may be null if the plugin is being disassociated from a container.

Throws:

ClassCastException - Container is not a EntityContainer.

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setStoreDirectoryName

public void setStoreDirectoryName(String dirName)

Set the sub-directory name under the server data directory where entity data will be stored.

This value will be appened to the value of jboss-server-data-dir.

This value is only used during creation and will not dynamically change the store directory when set after the create step has finished.

Parameters:

dirName - A sub-directory name.

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getStoreDirectoryName

public String getStoreDirectoryName()

Get the sub-directory name under the server data directory where entity data is stored.

Returns:

A sub-directory name.

See Also:

setStoreDirectoryName(java.lang.String)

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getStoreDirectory

public File getStoreDirectory()

Returns the directory used to store entity state files.

Returns:

The directory used to store entity state files.

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createService

protected void createService()
                      throws Exception

Throws:

Exception

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destroyService

protected void destroyService()
                       throws Exception

Try to remove the store directory, if we can't then ignore.

Throws:

Exception

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createBeanClassInstance

public Object createBeanClassInstance()
                               throws Exception

Description copied from interface: EntityPersistenceStore

Returns a new instance of the bean class or a subclass of the bean class.

Specified by:

createBeanClassInstance in interface EntityPersistenceStore

Returns:

the new instance

Throws:

Exception

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initEntity

public void initEntity(EntityEnterpriseContext ctx)

Reset all attributes to default value

The EJB 1.1 specification is not entirely clear about this, the EJB 2.0 spec is, see page 169. Robustness is more important than raw speed for most server applications, and not resetting atrribute values result in *very* weird errors (old states re-appear in different instances and the developer thinks he's on drugs).

Specified by:

initEntity in interface EntityPersistenceStore

Parameters:

ctx -

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createEntity

public Object createEntity(Method m,
                           Object[] args,
                           EntityEnterpriseContext ctx)
                    throws Exception

Description copied from interface: EntityPersistenceStore

This method is called whenever an entity is to be created. The persistence manager is responsible for handling the results properly wrt the persistent store.

Specified by:

createEntity in interface EntityPersistenceStore

Parameters:

m - the create method in the home interface that was called

args - any create parameters

ctx - the instance being used for this create call

Returns:

The primary key computed by CMP PM or null for BMP

Throws:

Exception

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postCreateEntity

public Object postCreateEntity(Method m,
                               Object[] args,
                               EntityEnterpriseContext ctx)
                        throws Exception

Description copied from interface: EntityPersistenceStore

This method is called after the createEntity. The persistence manager is responsible for handling the results properly wrt the persistent store.

Specified by:

postCreateEntity in interface EntityPersistenceStore

Parameters:

m - the ejbPostCreate method in the bean class that was called

args - any create parameters

ctx - the instance being used for this create call

Returns:

null

Throws:

Exception

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findEntity

public Object findEntity(Method finderMethod,
                         Object[] args,
                         EntityEnterpriseContext ctx,
                         GenericEntityObjectFactory factory)
                  throws javax.ejb.FinderException

Description copied from interface: EntityPersistenceStore

This method is called when single entities are to be found. The persistence manager must find out whether the wanted instance is available in the persistence store, if so it returns the primary key of the object.

Specified by:

findEntity in interface EntityPersistenceStore

Parameters:

finderMethod - the find method in the home interface that was called

args - any finder parameters

ctx - the instance to use for the finder call

Returns:

a primary key representing the found entity

Throws:

javax.ejb.FinderException

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findEntities

public Collection findEntities(Method finderMethod,
                               Object[] args,
                               EntityEnterpriseContext ctx,
                               GenericEntityObjectFactory factory)

Description copied from interface: EntityPersistenceStore

This method is called when collections of entities are to be found. The persistence manager must find out whether the wanted instances are available in the persistence store, and if so it must return a collection of primaryKeys.

Specified by:

findEntities in interface EntityPersistenceStore

Parameters:

finderMethod - the find method in the home interface that was called

args - any finder parameters

ctx - the instance to use for the finder call

Returns:

an primary key collection representing the found entities

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activateEntity

public void activateEntity(EntityEnterpriseContext ctx)

Non-operation.

Specified by:

activateEntity in interface EntityPersistenceStore

Parameters:

ctx - the instance to use for the activation

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loadEntity

public void loadEntity(EntityEnterpriseContext ctx)

Description copied from interface: EntityPersistenceStore

This method is called whenever an entity shall be load from the underlying storage. The persistence manager must load the state from the underlying storage and then call ejbLoad on the supplied instance.

Specified by:

loadEntity in interface EntityPersistenceStore

Parameters:

ctx - the instance to synchronize

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isStoreRequired

public boolean isStoreRequired(EntityEnterpriseContext ctx)
                        throws Exception

Description copied from interface: EntityPersistenceStore

This method is used to determine if an entity should be stored.

Specified by:

isStoreRequired in interface EntityPersistenceStore

Parameters:

ctx - the instance to check

Returns:

true, if the entity has been modified

Throws:

Exception - thrown if some system exception occurs

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isModified

public boolean isModified(EntityEnterpriseContext ctx)
                   throws Exception

Description copied from interface: EntityPersistenceStore

This method is used to determined whether the instance was modified. NOTE, even if the method returns true the isStoreRequired for this same instance might return false, e.g. a CMR field that doesn't have a foreign key was modified.

Specified by:

isModified in interface EntityPersistenceStore

Parameters:

ctx -

Returns:

Throws:

Exception

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storeEntity

public void storeEntity(EntityEnterpriseContext ctx)

Description copied from interface: EntityPersistenceStore

This method is called whenever an entity shall be stored to the underlying storage. The persistence manager must call ejbStore on the supplied instance and then store the state to the underlying storage.

Specified by:

storeEntity in interface EntityPersistenceStore

Parameters:

ctx - the instance to synchronize

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passivateEntity

public void passivateEntity(EntityEnterpriseContext ctx)

Non-operation.

Specified by:

passivateEntity in interface EntityPersistenceStore

Parameters:

ctx - the instance to passivate

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removeEntity

public void removeEntity(EntityEnterpriseContext ctx)
                  throws javax.ejb.RemoveException

Description copied from interface: EntityPersistenceStore

This method is called when an entity shall be removed from the underlying storage. The persistence manager must call ejbRemove on the instance and then remove its state from the underlying storage.

Specified by:

removeEntity in interface EntityPersistenceStore

Parameters:

ctx - the instance to remove

Throws:

javax.ejb.RemoveException - thrown if the instance could not be removed

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getFile

protected File getFile(Object id)

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