org.apache.openjpa.kernel
Interface OpenJPAStateManager

All Superinterfaces:

FieldConsumer, FieldManager, FieldSupplier, StateManager

All Known Implementing Classes:

DetachedStateManager, DetachedValueStateManager, ObjectIdStateManager, StateManagerImpl

public interface OpenJPAStateManager
extends StateManager, FieldManager

Interface implemented by OpenJPA state managers. Each state manager manages the state of a single persistence capable instance. The state manager is also responsible for all communications about the instance to the StoreManager. The fetchXXXField and storeXXXField methods can be used to get and set fields of the managed persistent object. Most back-end code, however, should use the similar fetchXXX and storeXXX methods in place of the field methods. These methods function just like the field methods, but also pass the value through the externalizer and factory the field may have.

Author:

Abe White

Field Summary

static int	SET_ATTACH The field is being attached by a detached state manager; the value is from the detached instance.
static int	SET_REMOTE The remote broker framework is setting the field on the server.
static int	SET_USER A user is setting the field.

Method Summary

boolean	assignObjectId(boolean flush) Ask the store manager to assign a permanent oid to this new instance.
boolean	beforeRefresh(boolean refreshAll) Prepare the instance for refresh
void	dirty(int field) Mark the given field as dirty.
Object	fetch(int field) Return the externalized value of the field with the given index as an object.
boolean	fetchBoolean(int field) Return the external value of the given field.
byte	fetchByte(int field) Return the external value of the given field.
char	fetchChar(int field) Return the external value of the given field.
double	fetchDouble(int field) Return the external value of the given field.
Object	fetchField(int field, boolean transitions) Return the value of the field with the given index as an object.
float	fetchFloat(int field) Return the external value of the given field.
Object	fetchInitialField(int field) Return the value of the field at the specified index as of the beginning of the transaction.
int	fetchInt(int field) Return the external value of the given field.
long	fetchLong(int field) Return the external value of the given field.
Object	fetchObject(int field) Return the external value of the given field.
short	fetchShort(int field) Return the external value of the given field.
String	fetchString(int field) Return the external value of the given field.
StoreContext	getContext() Return the managing context.
BitSet	getDirty() Return a read-only mask of the indexes of all dirty fields.
BitSet	getFlushed() Return a read-only mask of the indexes of all fields that have been flushed since they were last changed.
Object	getId() Return the identifier for this state manager.
Object	getImplData() An object that concrete back ends can associate with each instance.
Object	getImplData(int field) Field-level impl data.
Object	getIntermediate(int field) Use intermediate field data to store intermediate information that might be available before the field is fully loaded.
BitSet	getLoaded() Return a read-only mask of the indexes of all loaded fields.
Object	getLock() The lock object set for this instance.
Object	getManagedInstance() Return the managed instance.
ClassMetaData	getMetaData() Get the metadata for this instance.
Object	getObjectId() Return the instance's object id.
OpenJPAStateManager	getOwner() Return the owning state if this is an embedded instance.
ValueMetaData	getOwnerMetaData() Return the owning value.
PCState	getPCState() Return the state that this object is in.
PersistenceCapable	getPersistenceCapable() Return the PersistenceCapable instance that provides access to the instance managed by this state manager.
BitSet	getUnloaded(FetchConfiguration fetch) Return a mutable mask of the unloaded fields that need loading based on the given fetch configuration.
Object	getVersion() Return the current version indicator for this instance.
void	initialize(Class forType, PCState state) Initialize the state manager with a new instance of the given persistence capable type and the proper lifecycle state.
boolean	isDefaultValue(int field) Return true if the given field has a default value.
boolean	isEmbedded() Return true if this instance has an owner, meaning it is an embedded value.
boolean	isFlushed() Return whether this object has been flushed to the datastore in this transaction.
boolean	isFlushedDirty() Return whether this object has been flushed, then dirtied again.
boolean	isImplDataCacheable() Whether the instance-level impl data can be shared among instances in different contexts if L2 caching is enabled.
boolean	isImplDataCacheable(int field) Whether the field's impl data is loaded and can be shared among instances in different contexts if L2 caching is enabled.
boolean	isProvisional() Return whether this object is provisionally persistent.
boolean	isVersionCheckRequired() Returns true if this state needs to issue a version check at flush time.
boolean	isVersionUpdateRequired() Returns true if this state needs to issue a version update, possibly as a result of being locked.
void	load(FetchConfiguration fetch) Load fetch group fields.
Object	newFieldProxy(int field) Create a new hollow proxy instance for the given field.
Object	newProxy(int field) Create a new hollow proxy instance for the given field.
void	removed(int field, Object removed, boolean key) Notification that an element has been removed from the given field.
Object	setImplData(int field, Object data) Field-level impl data.
Object	setImplData(Object data, boolean cacheable) An object that concrete back ends can associate with each instance.
void	setIntermediate(int field, Object value) Use intermediate field data to store intermediate information that might be available before the field is fully loaded.
void	setLock(Object lock) The lock object set for this instance.
void	setNextVersion(Object version) Set the next version indicator in the datastore pending a successful flush.
void	setObjectId(Object oid) Set the object id for the managed instance.
void	setRemote(int field, Object value) Set the given field to the given value.
void	setVersion(Object version) Set the version indicator for this instance, as loaded from the data store.
void	store(int field, Object value) Set the value of the field with the given index as from the external object value.
void	storeBoolean(int field, boolean externalVal) Set the given external value back into the given field.
void	storeByte(int field, byte externalVal) Set the given external value back into the given field.
void	storeChar(int field, char externalVal) Set the given external value back into the given field.
void	storeDouble(int field, double externalVal) Set the given external value back into the given field.
void	storeField(int field, Object value) Set the value of the field with the given index as an object.
void	storeFloat(int field, float externalVal) Set the given external value back into the given field.
void	storeInt(int field, int externalVal) Set the given external value back into the given field.
void	storeLong(int field, long externalVal) Set the given external value back into the given field.
void	storeObject(int field, Object externalVal) Set the given external value back into the given field.
void	storeShort(int field, short externalVal) Set the given external value back into the given field.
void	storeString(int field, String externalVal) Set the given external value back into the given field.

Methods inherited from interface org.apache.openjpa.enhance.StateManager

accessingField, dirty, fetchObjectId, getGenericContext, isDeleted, isDetached, isDirty, isNew, isPersistent, isTransactional, providedBooleanField, providedByteField, providedCharField, providedDoubleField, providedFloatField, providedIntField, providedLongField, providedObjectField, providedShortField, providedStringField, proxyDetachedDeserialized, replaceBooleanField, replaceByteField, replaceCharField, replaceDoubleField, replaceFlags, replaceFloatField, replaceIntField, replaceLongField, replaceObjectField, replaceShortField, replaceStateManager, replaceStringField, serializing, settingBooleanField, settingByteField, settingCharField, settingDoubleField, settingFloatField, settingIntField, settingLongField, settingObjectField, settingShortField, settingStringField, writeDetached

Methods inherited from interface org.apache.openjpa.enhance.FieldConsumer

storeBooleanField, storeByteField, storeCharField, storeDoubleField, storeFloatField, storeIntField, storeLongField, storeObjectField, storeShortField, storeStringField

Methods inherited from interface org.apache.openjpa.enhance.FieldSupplier

fetchBooleanField, fetchByteField, fetchCharField, fetchDoubleField, fetchFloatField, fetchIntField, fetchLongField, fetchObjectField, fetchShortField, fetchStringField

Field Detail

SET_USER

static final int SET_USER

A user is setting the field.

See Also:

Constant Field Values

SET_REMOTE

static final int SET_REMOTE

The remote broker framework is setting the field on the server.

See Also:

Constant Field Values

SET_ATTACH

static final int SET_ATTACH

The field is being attached by a detached state manager; the value is from the detached instance.

See Also:

Constant Field Values

Method Detail

initialize

void initialize(Class forType,
                PCState state)

Initialize the state manager with a new instance of the given persistence capable type and the proper lifecycle state. Invoking this method may change the object id and metadata for the state manager, as the concrete type specified in the parameter may be a subclass of the expected type.

Parameters:

forType - the type for which to create a new instance

state - the initial state to which to set the instance

Since:

0.3.1.2

load

void load(FetchConfiguration fetch)

Load fetch group fields.

getManagedInstance

Object getManagedInstance()

Return the managed instance.

getPersistenceCapable

PersistenceCapable getPersistenceCapable()

Return the PersistenceCapable instance that provides access to the instance managed by this state manager. May be a proxy around the actual managed instance.

getMetaData

ClassMetaData getMetaData()

Get the metadata for this instance.

getOwner

OpenJPAStateManager getOwner()

Return the owning state if this is an embedded instance.

getOwnerMetaData

ValueMetaData getOwnerMetaData()

Return the owning value.

isEmbedded

boolean isEmbedded()

Return true if this instance has an owner, meaning it is an embedded value.

isFlushed

boolean isFlushed()

Return whether this object has been flushed to the datastore in this transaction.

isFlushedDirty

boolean isFlushedDirty()

Return whether this object has been flushed, then dirtied again.

isProvisional

boolean isProvisional()

Return whether this object is provisionally persistent.

getLoaded

BitSet getLoaded()

Return a read-only mask of the indexes of all loaded fields.

getDirty

BitSet getDirty()

Return a read-only mask of the indexes of all dirty fields.

getFlushed

BitSet getFlushed()

Return a read-only mask of the indexes of all fields that have been flushed since they were last changed.

getUnloaded

BitSet getUnloaded(FetchConfiguration fetch)

Return a mutable mask of the unloaded fields that need loading based on the given fetch configuration. Pass in null to retrieve all unloaded fields.

newProxy

Object newProxy(int field)

Create a new hollow proxy instance for the given field. In cases where the field externalizes to an SCO but is declared something else, the returned object may not implement Proxy. In all other cases, this method delegates to the system ProxyManager with the correct field information. The returned proxy's owner is unset so that modifications to the proxy will not be tracked while its state is initialized. Calling storeField(int, java.lang.Object) or store(int, java.lang.Object) will set the proxy's owner automatically.

newFieldProxy

Object newFieldProxy(int field)

Create a new hollow proxy instance for the given field. This method differs from newProxy(int) in that it returns a proxy for the field's declared type, not its externalized type.

See Also:

newProxy(int)

isDefaultValue

boolean isDefaultValue(int field)

Return true if the given field has a default value.

getContext

StoreContext getContext()

Return the managing context.

getPCState

PCState getPCState()

Return the state that this object is in.

getId

Object getId()

Return the identifier for this state manager. This may return a temporary identifier for new unflushed instances that have not been assigned an object id, or for non-persistent or embedded instances. For all other instances this method is the same as getObjectId().

getObjectId

Object getObjectId()

Return the instance's object id. This method will return null if no oid has been assigned. Oids are assigned to newly-persisted instances when the user first asks for it, or on flush.

setObjectId

void setObjectId(Object oid)

Set the object id for the managed instance. Some back ends may not be able to assign a permanent oid until flush. Do not call this method on application identity instances; changing the primary key fields of application identity objects through the storeXXXField methods will automatically change the oid.

assignObjectId

boolean assignObjectId(boolean flush)

Ask the store manager to assign a permanent oid to this new instance.

Parameters:

flush - if true, flush if necessary to get a permanent oid; if false, the oid may be left unassigned

Returns:

true if an oid assigned, false otherwise

getLock

Object getLock()

The lock object set for this instance. This object is generally managed by the system lock manager.

setLock

void setLock(Object lock)

The lock object set for this instance. This object is generally managed by the system lock manager.

getVersion

Object getVersion()

Return the current version indicator for this instance.

Specified by:

getVersion in interface StateManager

setVersion

void setVersion(Object version)

Set the version indicator for this instance, as loaded from the data store. This method is used by the StoreManager when loading instance data. On rollback, the version will be rolled back to this value. Version objects should be serializable and should not require vendor-specific classes, because they are transferred to detached objects.

setNextVersion

void setNextVersion(Object version)

Set the next version indicator in the datastore pending a successful flush. The StoreManager uses this method during flush.

isVersionUpdateRequired

boolean isVersionUpdateRequired()

Returns true if this state needs to issue a version update, possibly as a result of being locked.

isVersionCheckRequired

boolean isVersionCheckRequired()

Returns true if this state needs to issue a version check at flush time.

getImplData

Object getImplData()

An object that concrete back ends can associate with each instance. This object is not used or modified in any way by the generic persistence layer.

setImplData

Object setImplData(Object data,
                   boolean cacheable)

An object that concrete back ends can associate with each instance. This object is not used or modified in any way by the generic persistence layer.

Parameters:

cacheable - whether the impl data can be shared among instances in different contexts if L2 caching is enabled

Returns:

the previous impl data value, if any

isImplDataCacheable

boolean isImplDataCacheable()

Whether the instance-level impl data can be shared among instances in different contexts if L2 caching is enabled.

getImplData

Object getImplData(int field)

Field-level impl data. Field-level data only applies to loaded fields, and is cleared when the field is cleared.

setImplData

Object setImplData(int field,
                   Object data)

Field-level impl data. Field-level data only applies to loaded fields, and is cleared when the field is cleared. Whether the data is cached across instances depends on the corresponding field metadata's response to FieldMetaData.usesImplData().

Returns:

the previous impl data value, if any

isImplDataCacheable

boolean isImplDataCacheable(int field)

Whether the field's impl data is loaded and can be shared among instances in different contexts if L2 caching is enabled.

getIntermediate

Object getIntermediate(int field)

Use intermediate field data to store intermediate information that might be available before the field is fully loaded. The system will automatically clear this data when the field gets loaded. This data should be cacheable; the datastore cache will attempt to cache it if the field value is not available.

setIntermediate

void setIntermediate(int field,
                     Object value)

Use intermediate field data to store intermediate information that might be available before the field is fully loaded. The system will automatically clear this data when the field gets loaded. This data should be cacheable; the datastore cache will attempt to cache it if the field value is not available.

fetchBoolean

boolean fetchBoolean(int field)

Return the external value of the given field.

fetchByte

byte fetchByte(int field)

Return the external value of the given field.

fetchChar

char fetchChar(int field)

Return the external value of the given field.

fetchDouble

double fetchDouble(int field)

Return the external value of the given field.

fetchFloat

float fetchFloat(int field)

Return the external value of the given field.

fetchInt

int fetchInt(int field)

Return the external value of the given field.

fetchLong

long fetchLong(int field)

Return the external value of the given field.

fetchObject

Object fetchObject(int field)

Return the external value of the given field.

fetchShort

short fetchShort(int field)

Return the external value of the given field.

fetchString

String fetchString(int field)

Return the external value of the given field.

fetch

Object fetch(int field)

Return the externalized value of the field with the given index as an object. If there is no externalizer, this is equivalent to fetchField(int, boolean).

fetchField

Object fetchField(int field,
                  boolean transitions)

Return the value of the field with the given index as an object.

Parameters:

transitions - if true, this method will cause state transitions to occur as if the field were accessed normally

fetchInitialField

Object fetchInitialField(int field)

Return the value of the field at the specified index as of the beginning of the transaction.

Since:

0.3.1.1

storeBoolean

void storeBoolean(int field,
                  boolean externalVal)

Set the given external value back into the given field.

storeByte

void storeByte(int field,
               byte externalVal)

Set the given external value back into the given field.

storeChar

void storeChar(int field,
               char externalVal)

Set the given external value back into the given field.

storeDouble

void storeDouble(int field,
                 double externalVal)

Set the given external value back into the given field.

storeFloat

void storeFloat(int field,
                float externalVal)

Set the given external value back into the given field.

storeInt

void storeInt(int field,
              int externalVal)

Set the given external value back into the given field.

storeLong

void storeLong(int field,
               long externalVal)

Set the given external value back into the given field.

storeObject

void storeObject(int field,
                 Object externalVal)

Set the given external value back into the given field.

storeShort

void storeShort(int field,
                short externalVal)

Set the given external value back into the given field.

storeString

void storeString(int field,
                 String externalVal)

Set the given external value back into the given field.

store

void store(int field,
           Object value)

Set the value of the field with the given index as from the external object value. If there is no externalizer, this is equivalent to storeField(int, java.lang.Object).

storeField

void storeField(int field,
                Object value)

Set the value of the field with the given index as an object.

dirty

void dirty(int field)

Mark the given field as dirty.

removed

void removed(int field,
             Object removed,
             boolean key)

Notification that an element has been removed from the given field.

beforeRefresh

boolean beforeRefresh(boolean refreshAll)

Prepare the instance for refresh

Parameters:

refreshAll - true if this instance is one of a collection of objects being refreshed

Returns:

true if the object needs a refresh, false otherwise

See Also:

Broker.refresh(java.lang.Object, org.apache.openjpa.kernel.OpCallbacks)

setRemote

void setRemote(int field,
               Object value)

Set the given field to the given value. Make the field dirty as if user code set it. Do not delete dependent objects in the field's current value. This method is invoked by the remote package to synch a server-side state manager with remote changes. We do not need to delete dependent instances because they will have been deleted when the field changed on the client side, and those client-side deletes will be transmitted independently.

Since:

0.3.1