DelegatingStoreManager (OpenJPA Parent POM 2.4.2 API)

java.lang.Object
- org.apache.openjpa.kernel.DelegatingStoreManager

All Implemented Interfaces:

StoreManager, Closeable

Direct Known Subclasses:

DataCacheStoreManager
```
public abstract class DelegatingStoreManager
extends Object
implements StoreManager
```
Base class for store manager decorators that delegate to another store manager for some operations.

Author:

Abe White

Field Summary
- Fields inherited from interface org.apache.openjpa.kernel.StoreManager
  FORCE_LOAD_ALL, FORCE_LOAD_DFG, FORCE_LOAD_NONE, FORCE_LOAD_REFRESH, VERSION_DIFFERENT, VERSION_EARLIER, VERSION_LATER, VERSION_SAME

Constructor Summary

Constructors
Constructor and Description

DelegatingStoreManager(StoreManager store)
Constructor.

Constructors
Constructor and Description
`DelegatingStoreManager(StoreManager store)` Constructor.

Method Summary

Methods
Modifier and Type	Method and Description
`boolean`	`assignField(OpenJPAStateManager sm, int field, boolean preFlush)` Assign a value to the given field.
`boolean`	`assignObjectId(OpenJPAStateManager sm, boolean preFlush)` Assign an object id to the given new instance.
`void`	`beforeStateChange(OpenJPAStateManager sm, PCState fromState, PCState toState)` Notification that the given state manager is about to change its lifecycle state.
`void`	`begin()` Begin a data store transaction.
`void`	`beginOptimistic()` Notification that an optimistic transaction has started.
`boolean`	`cancelAll()` Cancel all pending data store statements.
`void`	`close()` Free any resources this store manager is using.
`void`	`commit()` Commit the current data store transaction.
`int`	`compareVersion(OpenJPAStateManager state, Object v1, Object v2)` Compare the two version objects.
`Object`	`copyDataStoreId(Object oid, ClassMetaData meta)` Copy the given object id value.
`boolean`	`equals(Object other)`
`ResultObjectProvider`	`executeExtent(ClassMetaData meta, boolean subclasses, FetchConfiguration fetch)` Return a provider for all instances of the given candidate class, optionally including subclasses.
`boolean`	`exists(OpenJPAStateManager sm, Object context)` Verify that the given instance exists in the data store; return false if it does not.
`Collection<Exception>`	`flush(Collection<OpenJPAStateManager> sms)` Flush the given state manager collection to the datastore, returning a collection of exceptions encountered during flushing.
`Object`	`getClientConnection()` Return a connection to the data store suitable for client use.
`Seq`	`getDataStoreIdSequence(ClassMetaData forClass)` Return a sequence that generates datastore identity values for the given class.
`Class<?>`	`getDataStoreIdType(ClassMetaData meta)` Return the class used by this StoreManager for datastore identity values.
`StoreManager`	`getDelegate()` Return the wrapped store manager.
`StoreManager`	`getInnermostDelegate()` Return the base underlying native store manager.
`Class<?>`	`getManagedType(Object oid)` Return the persistent class for the given data store identity value.
`Seq`	`getValueSequence(FieldMetaData fmd)` Return a sequence that generates values for the given field.
`int`	`hashCode()`
`boolean`	`initialize(OpenJPAStateManager sm, PCState state, FetchConfiguration fetch, Object context)` Initialize the given state manager.
`boolean`	`isCached(List<Object> oids, BitSet edata)` Verify that the given instance exists in the data store in memory; return false if it does not.
`boolean`	`load(OpenJPAStateManager sm, BitSet fields, FetchConfiguration fetch, int lockLevel, Object context)` Load the given state manager.
`Collection<Object>`	`loadAll(Collection<OpenJPAStateManager> sms, PCState state, int load, FetchConfiguration fetch, Object context)` Initialize, load, or validate the existance of all of the given objects.
`Object`	`newDataStoreId(Object oidVal, ClassMetaData meta)` Create a new unique datastore identity for the given type from the given oid value (presumably pk, stringified oid, or oid instance).
`FetchConfiguration`	`newFetchConfiguration()` Return a fetch configuration suitable for this runtime.
`StoreQuery`	`newQuery(String language)` Return a query implementation suitable for this store.
`void`	`releaseConnection()` Instruct the store to release a retained connection.
`void`	`retainConnection()` Instruct the store to retain a connection for continued use.
`void`	`rollback()` Rollback the current data store transaction.
`void`	`rollbackOptimistic()` Notification that an optimistic transaction was rolled back before a data store transaction ever began.
`void`	`setContext(StoreContext ctx)` Set a reference to the corresponding context.
`boolean`	`syncVersion(OpenJPAStateManager sm, Object context)` Update the version information in the given state manager to the version stored in the data store.

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - DelegatingStoreManager
```
public DelegatingStoreManager(StoreManager store)
```
    Constructor. Supply delegate.
- Method Detail
  - getDelegate
```
public StoreManager getDelegate()
```
    Return the wrapped store manager.
  - getInnermostDelegate
```
public StoreManager getInnermostDelegate()
```
    Return the base underlying native store manager.
  - hashCode
```
public int hashCode()
```
    Overrides:
    
    hashCode in class Object
  - equals
```
public boolean equals(Object other)
```
    Overrides:
    
    equals in class Object
  - setContext
```
public void setContext(StoreContext ctx)
```
    Description copied from interface: StoreManager
    
    Set a reference to the corresponding context. This method will be called before the store manager is used. The store manager is responsible for pulling any necessary configuration data from the context, including the transaction mode and connection retain mode.
    
    Specified by:
    
    setContext in interface StoreManager
  - beginOptimistic
```
public void beginOptimistic()
```
    Description copied from interface: StoreManager
    
    Notification that an optimistic transaction has started. This method does not replace the StoreManager.begin() method, which will still be called when a true data store transaction should begin.
    
    Specified by:
    
    beginOptimistic in interface StoreManager
  - rollbackOptimistic
```
public void rollbackOptimistic()
```
    Description copied from interface: StoreManager
    
    Notification that an optimistic transaction was rolled back before a data store transaction ever began.
    
    Specified by:
    
    rollbackOptimistic in interface StoreManager
  - begin
```
public void begin()
```
    Description copied from interface: StoreManager
    
    Begin a data store transaction. After this method is called, it is assumed that all further operations are operating in a single transaction that can be committed or rolled back. If optimistic transactions are in use, this method will only be called when the system requires a transactionally consistent connection due to a user request to flush or commit the transaction. In this case, it is possible that the optimistic transaction does not have the latest versions of all instances (i.e. another transaction has modified the same instances and committed since the optimistic transaction started). On commit, an exception must be thrown on any attempt to overwrite data for an instance with an older version.
    
    Specified by:
    
    begin in interface StoreManager
  - commit
```
public void commit()
```
    Description copied from interface: StoreManager
    
    Commit the current data store transaction.
    
    Specified by:
    
    commit in interface StoreManager
  - rollback
```
public void rollback()
```
    Description copied from interface: StoreManager
    
    Rollback the current data store transaction.
    
    Specified by:
    
    rollback in interface StoreManager
  - exists
```
public boolean exists(OpenJPAStateManager sm,
             Object context)
```
    Description copied from interface: StoreManager
    
    Verify that the given instance exists in the data store; return false if it does not.
    
    Specified by:
    
    exists in interface StoreManager
  - syncVersion
```
public boolean syncVersion(OpenJPAStateManager sm,
                  Object context)
```
    Description copied from interface: StoreManager
    
    Update the version information in the given state manager to the version stored in the data store.
    
    Specified by:
    
    syncVersion in interface StoreManager
    
    Parameters:
    sm - the instance to check
    context - the current execution data, or null if not given to the calling method of the context
    
    Returns:
    true if the instance still exists in the datastore and is up-to-date, false otherwise
  - initialize
```
public boolean initialize(OpenJPAStateManager sm,
                 PCState state,
                 FetchConfiguration fetch,
                 Object context)
```
    Description copied from interface: StoreManager
    
    Initialize the given state manager. The object id of the state manager will be set, and the state manager's metadata be set to the class of the instance to load, or possibly one of its superclasses. Initialization involves first calling the OpenJPAStateManager.initialize(java.lang.Class, org.apache.openjpa.kernel.PCState) method with a new instance of the correct type constructed with the PCRegistry.newInstance(Class, org.apache.openjpa.enhance.StateManager, boolean) method (this will reset the state manager's metadata if the actual type was a subclass). After instance initialization, load any the fields for the given fetch configuration that can be efficiently retrieved. If any of the configured fields are not loaded in this method, they will be loaded with a subsequent call to StoreManager.load(org.apache.openjpa.kernel.OpenJPAStateManager, java.util.BitSet, org.apache.openjpa.kernel.FetchConfiguration, int, java.lang.Object). If this method is called during a data store transaction, the instance's database record should be locked. Version information can be loaded if desired through the OpenJPAStateManager.setVersion(java.lang.Object) method.
    
    Specified by:
    
    initialize in interface StoreManager
    
    Parameters:
    sm - the instance to initialize
    state - the lifecycle state to initialize the state manager with
    fetch - configuration for how to load the instance
    context - the current execution data, or null if not given to the calling method of the broker
    
    Returns:
    true if the matching instance exists in the data store, false otherwise
  - load
```
public boolean load(OpenJPAStateManager sm,
           BitSet fields,
           FetchConfiguration fetch,
           int lockLevel,
           Object context)
```
    Description copied from interface: StoreManager
    
    Load the given state manager. Note that any collection or map types loaded into the state manager will be proxied with the correct type; therefore the store manager does not have to load the same concrete collection/map types as the instance declares. However, array types must be consistent with the array type stored by the persistence capable instance. If this method is called during a data store transaction, the instance should be locked. If the given state manager does not have its version set already, version information can be loaded if desired through the OpenJPAStateManager.setVersion(java.lang.Object) method.
    
    Specified by:
    
    load in interface StoreManager
    
    Parameters:
    sm - the instance to load
    fields - set of fields to load; all field indexes in this set must be loaded; this set is mutable
    fetch - the fetch configuration to use when loading related objects
    lockLevel - attempt to load simple fields at this lock level; relations should be loaded at the read lock level of the fetch configuration
    context - the current execution data, or null if not given to the calling method of the broker
    
    Returns:
    false if the object no longer exists in the database, true otherwise
  - loadAll
```
public Collection<Object> loadAll(Collection<OpenJPAStateManager> sms,
                         PCState state,
                         int load,
                         FetchConfiguration fetch,
                         Object context)
```
    Description copied from interface: StoreManager
    Initialize, load, or validate the existance of all of the given objects. This method is called from various broker methods that act on multiple objects, such as StoreContext.retrieveAll(java.util.Collection<java.lang.Object>, boolean, org.apache.openjpa.kernel.OpCallbacks). It gives the store manager an opportunity to efficiently batch-load data for several objects. Each of the given state managers will be in one of three states, each requiring a different action:
    - stateManager.getO () == null: An uninitialized state manager. Perform the same actions as in StoreManager.initialize(org.apache.openjpa.kernel.OpenJPAStateManager, org.apache.openjpa.kernel.PCState, org.apache.openjpa.kernel.FetchConfiguration, java.lang.Object).
    - load != FORCE_LOAD_NONE || stateManager.getPCState () == PCState.HOLLOW: A hollow state manager, or one whose fields must be loaded because this is a refresh or retrieve action. Peform the same actions as in StoreManager.load(org.apache.openjpa.kernel.OpenJPAStateManager, java.util.BitSet, org.apache.openjpa.kernel.FetchConfiguration, int, java.lang.Object), choosing the fields to load based on the fetch configuration, or loading all fields if load == FORCE_LOAD_ALL. Any required fields left unloaded will cause a subsequent invocation of StoreManager.load(org.apache.openjpa.kernel.OpenJPAStateManager, java.util.BitSet, org.apache.openjpa.kernel.FetchConfiguration, int, java.lang.Object) on the individual object in question.
    - load == FORCE_LOAD_NONE && stateManager.getPCState () != PCState.HOLLOW: A non-hollow state manager. Perform the same actions as in StoreManager.exists(org.apache.openjpa.kernel.OpenJPAStateManager, java.lang.Object), and load additional state if desired. Non-hollow objects will only be included outside of refresh invocations if a user calls findAll with the validate parameter set to true.
    Store managers that cannot efficiently batch load can simply test for these conditions and delegate to the proper methods.
    Specified by:
    
    loadAll in interface StoreManager
    
    Parameters:
    sms - the state manager instances to load
    state - the lifecycle state to initialize uninitialized state managers with; may be null if no uninitialized instances are included in sms
    load - one of the FORCE_LOAD_* constants describing the fields to force-load if this is a refresh or retrieve action
    fetch - the current fetch configuration to use when loading related objects
    context - the current execution data, or null if not given to the calling method of the broker
    
    Returns:
    a collection of the state manager identities for which no data store record exists
    See Also:
    ImplHelper.loadAll(java.util.Collection, org.apache.openjpa.kernel.StoreManager, org.apache.openjpa.kernel.PCState, int, org.apache.openjpa.kernel.FetchConfiguration, java.lang.Object)
  - beforeStateChange
```
public void beforeStateChange(OpenJPAStateManager sm,
                     PCState fromState,
                     PCState toState)
```
    Description copied from interface: StoreManager
    
    Notification that the given state manager is about to change its lifecycle state. The store manager is not required to do anything in this method, but some back ends may need to.
    
    Specified by:
    
    beforeStateChange in interface StoreManager
  - flush
```
public Collection<Exception> flush(Collection<OpenJPAStateManager> sms)
```
    Description copied from interface: StoreManager
    
    Flush the given state manager collection to the datastore, returning a collection of exceptions encountered during flushing. The given collection may include states that do not require data store action, such as persistent-clean instances or persistent-dirty instances that have not been modified since they were last flushed. For datastore updates and inserts, the dirty, non-flushed fields of each state should be flushed. New instances without an assigned object id should be given one via OpenJPAStateManager.setObjectId(java.lang.Object). New instances with value-strategy fields that have not been assigned yet should have their fields set. Datastore version information should be updated during flush, and the state manager's version indicator updated through the OpenJPAStateManager.setNextVersion(java.lang.Object) method. The current version will roll over to this next version upon successful commit.
    
    Specified by:
    
    flush in interface StoreManager
    
    See Also:
    org.apache.openjpa.util.ApplicationIds#assign()
  - assignObjectId
```
public boolean assignObjectId(OpenJPAStateManager sm,
                     boolean preFlush)
```
    Description copied from interface: StoreManager
    
    Assign an object id to the given new instance. Return false if the instance cannot be assigned an identity because a flush is required (for example, the identity is determined by the datastore on insert). For application identity instances, the assigned object id should be based on field state. The implementation is responsible for using the proper value strategy according to the instance metadata. This method is called the first time a user requests the oid of a new instance before flush.
    
    Specified by:
    
    assignObjectId in interface StoreManager
    
    preFlush - whether this assignment is being requested by the system as part of pre-flush activities, and can be ignored if it is more efficient to assign within StoreManager.flush(java.util.Collection<org.apache.openjpa.kernel.OpenJPAStateManager>)
    See Also:
    ImplHelper.generateFieldValue(org.apache.openjpa.kernel.StoreContext, org.apache.openjpa.meta.FieldMetaData), ImplHelper.generateIdentityValue(org.apache.openjpa.kernel.StoreContext, org.apache.openjpa.meta.ClassMetaData, int), org.apache.openjpa.util.ApplicationIds#assign()
  - assignField
```
public boolean assignField(OpenJPAStateManager sm,
                  int field,
                  boolean preFlush)
```
    Description copied from interface: StoreManager
    
    Assign a value to the given field. Return false if the value cannot be assigned because a flush is required (for example, the field value is determined by the datastore on insert). This method is called the first time a user requests the value of a field with a value-strategy on a new instance before flush.
    
    Specified by:
    
    assignField in interface StoreManager
    
    preFlush - whether this assignment is being requested by the system as part of pre-flush activities, and can be ignored if it is more efficient to assign within StoreManager.flush(java.util.Collection<org.apache.openjpa.kernel.OpenJPAStateManager>)
    See Also:
    ImplHelper.generateFieldValue(org.apache.openjpa.kernel.StoreContext, org.apache.openjpa.meta.FieldMetaData)
  - getManagedType
```
public Class<?> getManagedType(Object oid)
```
    Description copied from interface: StoreManager
    
    Return the persistent class for the given data store identity value. If the given value is not a datastore identity object, return null.
    
    Specified by:
    
    getManagedType in interface StoreManager
  - getDataStoreIdType
```
public Class<?> getDataStoreIdType(ClassMetaData meta)
```
    Description copied from interface: StoreManager
    
    Return the class used by this StoreManager for datastore identity values. The given metadata may be null, in which case the return value should the common datastore identity class for all classes, or null if this store manager does not use a common identity class.
    
    Specified by:
    
    getDataStoreIdType in interface StoreManager
  - copyDataStoreId
```
public Object copyDataStoreId(Object oid,
                     ClassMetaData meta)
```
    Description copied from interface: StoreManager
    
    Copy the given object id value. Use the described type of the given metadata, which may be a subclass of the given oid's described type.
    
    Specified by:
    
    copyDataStoreId in interface StoreManager
  - newDataStoreId
```
public Object newDataStoreId(Object oidVal,
                    ClassMetaData meta)
```
    Description copied from interface: StoreManager
    
    Create a new unique datastore identity for the given type from the given oid value (presumably pk, stringified oid, or oid instance).
    
    Specified by:
    
    newDataStoreId in interface StoreManager
  - getClientConnection
```
public Object getClientConnection()
```
    Description copied from interface: StoreManager
    
    Return a connection to the data store suitable for client use. If this method is called during a data store transaction, thie connection must be transactional. If no connection is in use, this method should create one to return.
    
    Specified by:
    
    getClientConnection in interface StoreManager
  - retainConnection
```
public void retainConnection()
```
    Description copied from interface: StoreManager
    
    Instruct the store to retain a connection for continued use. This will be invoked automatically based on the user's configured connection retain mode.
    
    Specified by:
    
    retainConnection in interface StoreManager
  - releaseConnection
```
public void releaseConnection()
```
    Description copied from interface: StoreManager
    
    Instruct the store to release a retained connection. This will be invoked automatically based on the user's configured connection retain mode.
    
    Specified by:
    
    releaseConnection in interface StoreManager
  - executeExtent
```
public ResultObjectProvider executeExtent(ClassMetaData meta,
                                 boolean subclasses,
                                 FetchConfiguration fetch)
```
    Description copied from interface: StoreManager
    
    Return a provider for all instances of the given candidate class, optionally including subclasses. The given candidate may be an unmapped type with mapped subclasses. If the provider is iterated within a data store transaction, returned instances should be locked.
    
    Specified by:
    
    executeExtent in interface StoreManager
  - newQuery
```
public StoreQuery newQuery(String language)
```
    Description copied from interface: StoreManager
    
    Return a query implementation suitable for this store. If the query is iterated within a data store transaction, returned instances should be locked. Return null if this store does not support native execution of the given language. OpenJPA can execute JPQL in memory even without back end support.
    
    Specified by:
    
    newQuery in interface StoreManager
    
    Parameters:
    language - the query language
  - newFetchConfiguration
```
public FetchConfiguration newFetchConfiguration()
```
    Description copied from interface: StoreManager
    
    Return a fetch configuration suitable for this runtime. Typically will be or extend FetchConfigurationImpl.
    
    Specified by:
    
    newFetchConfiguration in interface StoreManager
  - close
```
public void close()
```
    Description copied from interface: StoreManager
    
    Free any resources this store manager is using.
    
    Specified by:
    
    close in interface StoreManager
    
    Specified by:
    
    close in interface Closeable
  - compareVersion
```
public int compareVersion(OpenJPAStateManager state,
                 Object v1,
                 Object v2)
```
    Description copied from interface: StoreManager
    
    Compare the two version objects.
    Specified by:
    
    compareVersion in interface StoreManager
    
    Parameters:
    state - the state manager for the object
    v1 - the first version object to compare
    v2 - the second version object to compare
    
    Returns:
    StoreManager.VERSION_LATER if v1 is later than v2
    
    StoreManager.VERSION_EARLIER if v1 is earlier than v2
    
    StoreManager.VERSION_SAME if v1 is the same as v2
    
    StoreManager.VERSION_DIFFERENT if v1 is different from v2, but the time difference of the versions cannot be determined
  - getDataStoreIdSequence
```
public Seq getDataStoreIdSequence(ClassMetaData forClass)
```
    Description copied from interface: StoreManager
    Return a sequence that generates datastore identity values for the given class. This method will only be called when the identity strategy for the class is one of:
    If the identity strategy cannot be represented as a sequence, return null.
    Specified by:
    
    getDataStoreIdSequence in interface StoreManager
  - getValueSequence
```
public Seq getValueSequence(FieldMetaData fmd)
```
    Description copied from interface: StoreManager
    Return a sequence that generates values for the given field. This method will only be called when the value strategy for the field is one of:
    If the value strategy cannot be represented as a sequence, return null.
    Specified by:
    
    getValueSequence in interface StoreManager
  - cancelAll
```
public boolean cancelAll()
```
    Description copied from interface: StoreManager
    
    Cancel all pending data store statements.
    
    Specified by:
    
    cancelAll in interface StoreManager
    
    Returns:
    true if any statements cancelled, false otherwise
  - isCached
```
public boolean isCached(List<Object> oids,
               BitSet edata)
```
    Description copied from interface: StoreManager
    
    Verify that the given instance exists in the data store in memory; return false if it does not. When an object is found in memory the corresponding element of the BitSet is set to 1.
    
    Specified by:
    
    isCached in interface StoreManager

Class DelegatingStoreManager

Field Summary

Fields inherited from interface org.apache.openjpa.kernel.StoreManager

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

DelegatingStoreManager

Method Detail

getDelegate

getInnermostDelegate

hashCode

equals

setContext

beginOptimistic

rollbackOptimistic

begin

commit

rollback

exists

syncVersion

initialize

load

loadAll

beforeStateChange

flush

assignObjectId

assignField

getManagedType

getDataStoreIdType

copyDataStoreId

newDataStoreId

getClientConnection

retainConnection

releaseConnection

executeExtent

newQuery

newFetchConfiguration

close

compareVersion

getDataStoreIdSequence

getValueSequence

cancelAll

isCached