Package 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 Details

    • SET_USER

      static final int SET_USER
      A user is setting the field.
      See Also:

    • SET_REMOTE

      static final int SET_REMOTE
      The remote broker framework is setting the field on the server.
      See Also:

    • 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:

  • Method Details

    • 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.

    • getOwnerIndex

      int getOwnerIndex()
      Return the owning value's field index
      Since:
      1.1.0

    • 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:

    • 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:

    • 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

    • isDelayed

      boolean isDelayed(int field)
      Some field types (collection proxies) support delayed loading. Delayed loading is a step beyond lazy loading. Delayed load allows an instance of a field to be returned without actually loading it.
      Returns:
      true if the field is setup for delayed access

    • setDelayed

      void setDelayed(int field, boolean delay)
      Some field types (collection proxies) support delayed loading. Delayed loading is a step beyond lazy loading. Delayed load allows an instance of a field to be returned without actually loading it.

    • loadDelayedField

      void loadDelayedField(int field)
      If a field was marked delayed in a previous load operation this method can be used to load the field.

    • fetchObjectField

      Object fetchObjectField(int field)
      Fetch an object field by index.
      Specified by:
      fetchObjectField in interface FieldSupplier