kodo.jdbc.runtime
Class JDBCStoreManager

java.lang.Object
  |
  +--kodo.jdbc.runtime.JDBCStoreManager

All Implemented Interfaces:

com.solarmetric.util.Closeable, StoreManager

public class JDBCStoreManager

extends Object

implements StoreManager

StoreManager plugin that uses JDBC to store persistent data in a relational data store.

Fields inherited from interface kodo.runtime.StoreManager

FORCE_LOAD_ALL, FORCE_LOAD_DFG, FORCE_LOAD_NONE, FORCE_LOAD_REFRESH, VERSION_DIFFERENT, VERSION_EARLIER, VERSION_LATER, VERSION_SAME

Constructor Summary

JDBCStoreManager()

Method Summary

boolean	addClassConditions(Select sel, ClassMapping mapping, boolean subs, Joins joins) Add WHERE conditions to the given select limiting the returned results to the given mapping type, possibly including subclasses.
boolean	assignObjectId(KodoStateManager sm) Assign an object id to the given new instance.
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	changeJDOState(KodoStateManager sm, JDOState fromState, JDOState toState) Notification that the given state manager is about to change its JDO state.
void	close() Free any resources this store manager is using.
void	commit() Commit the current data store transaction.
int	compareVersion(KodoStateManager state, Object v1, Object v2) Compare the two version objects.
Object	copyDataStoreId(Object oid, ClassMetaData meta) Copy the given object id value.
boolean	exists(KodoStateManager sm, Object context) Verify that the given instance exists in the data store; return false if it does not.
Collection	flush(Collection states) Flush the given state manager collection to the datastore, returning a collection of exceptions encountered during flushing.
JDBCConfiguration	getConfiguration() Return the configuration for this runtime.
Object	getConnection() Return a connection to the data store.
int	getCount(Select sel) Return the count for the given query.
Class	getDataStoreIdClass(ClassMetaData meta) Return the class used by this StoreManager for datastore identity values.
Connection	getJDBCConnection() Return a SQL connection to the database.
JDBCLockManager	getJDBCLockManager() Return the jdbc lock manager, or null if the lock manager does not implement JDBCLockManager.
Class	getPersistenceCapableClass(Object oid) Return the persistent class for the given data store identity value.
KodoPersistenceManager	getPersistenceManager() Return the PersistenceManager this StoreManager is owned by.
SequenceGenerator	getSequenceGenerator(ClassMetaData meta) Returns a SequenceGenerator for the specified class.
boolean	hasConnection() Return true if this store manager has established a dedicated connection to the data store.
boolean	initialize(KodoStateManager sm, JDOState state, FetchConfiguration fetch, Object context) Initialize the given state manager.
boolean	isActive() Return whether there is a datastore transaction active.
boolean	load(KodoStateManager sm, BitSet fields, FetchConfiguration fetch, int lockLevel, Object context) Load the given state manager.
Object	load(Object oid, JDBCFetchConfiguration fetch) Load the object with the given oid.
Collection	loadAll(Collection sms, JDOState state, int load, FetchConfiguration fetch, Object context) Initialize, load, or validate the existance of all of the given objects.
Object	loadMappings(ClassMapping mapping, JDBCFetchConfiguration fetch, BitSet exclude, Result result) For implementation use only.
void	loadSubclasses(ClassMapping mapping) Makes sure all subclasses of the given type are loaded in the JVM.
Id	newDataStoreId(long id, ClassMapping mapping) Create a new datastore identity object from the given id value and mapping.
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).
KodoExtent	newExtent(Class cls, boolean subclasses) Return an extent of the given candidate class, optionally including subclasses.
FetchConfiguration	newFetchConfiguration() Return a fetch configuration suitable for this runtime.
KodoQuery	newQuery(String language) Return a query implementation suitable for this runtime.
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.
boolean	selectMappings(Select sel, ClassMapping mapping, int subs, KodoStateManager sm, BitSet fields, JDBCFetchConfiguration fetch, int eager, boolean ident) For implementation use only.
void	setPersistenceManager(KodoPersistenceManager pm) Set the PersistenceManager this StoreManager is owned by.
boolean	synchVersion(KodoStateManager 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, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

JDBCStoreManager

public JDBCStoreManager()

Method Detail

getPersistenceManager

public KodoPersistenceManager getPersistenceManager()

Return the PersistenceManager this StoreManager is owned by.

setPersistenceManager

public void setPersistenceManager(KodoPersistenceManager pm)

Set the PersistenceManager this StoreManager is owned by.

Specified by:

setPersistenceManager in interface StoreManager

getConfiguration

public JDBCConfiguration getConfiguration()

Return the configuration for this runtime.

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 JDO 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

getConnection

public Object getConnection()

Description copied from interface: StoreManager

Return a connection to the data store. 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:

getConnection in interface StoreManager

hasConnection

public boolean hasConnection()

Description copied from interface: StoreManager

Return true if this store manager has established a dedicated connection to the data store. This typically depends on the transactional state and KodoPersistenceManager.getConnectionRetainMode().

Specified by:

hasConnection in interface StoreManager

exists

public boolean exists(KodoStateManager 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

synchVersion

public boolean synchVersion(KodoStateManager 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:

synchVersion in interface StoreManager

Following copied from interface: kodo.runtime.StoreManager

Parameters:

sm - the instance to check

context - the current context information, or null if not given to the calling method of the persistence manager

Returns:

true if the instance still exists in the datastore and is up-to-date, false otherwise

compareVersion

public int compareVersion(KodoStateManager state,
                          Object v1,
                          Object v2)

Description copied from interface: StoreManager

Compare the two version objects.

Specified by:

compareVersion in interface StoreManager

Following copied from interface: kodo.runtime.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

initialize

public boolean initialize(KodoStateManager sm,
                          JDOState 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 KodoStateManager.initialize(javax.jdo.spi.PersistenceCapable, kodo.runtime.JDOState) method with a new instance of the correct type constructed with the JDOImplHelper.newInstance(Class,StateManager,Object) 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(kodo.runtime.KodoStateManager, java.util.BitSet, kodo.runtime.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 KodoStateManager.setVersion(java.lang.Object) method.

Specified by:

initialize in interface StoreManager

Following copied from interface: kodo.runtime.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 context information, or null if not given to the calling method of the persistence manager

Returns:

true if the matching instance exists in the data store, false otherwise

load

public boolean load(KodoStateManager 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 stroe 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 KodoStateManager.setVersion(java.lang.Object) method.

Specified by:

load in interface StoreManager

Following copied from interface: kodo.runtime.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 context information, or null if not given to the calling method of the persistence manager

Returns:

false if the object no longer exists in the database, true otherwise

loadAll

public Collection loadAll(Collection sms,
                          JDOState 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 persistence manager methods that act on multiple objects, such as KodoPersistenceManager.getObjectsById(java.lang.Object[], boolean). 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.getPersistenceCapable () == null: An uninitialized state manager. Perform the same actions as in StoreManager.initialize(kodo.runtime.KodoStateManager, kodo.runtime.JDOState, kodo.runtime.FetchConfiguration, java.lang.Object).
• load != FORCE_LOAD_NONE || stateManager.getJDOState () == JDOState.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(kodo.runtime.KodoStateManager, java.util.BitSet, kodo.runtime.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(kodo.runtime.KodoStateManager, java.util.BitSet, kodo.runtime.FetchConfiguration, int, java.lang.Object) on the individual object in question.
• load == FORCE_LOAD_NONE && stateManager.getJDOState () != JDOState.HOLLOW: A non-hollow state manager. Perform the same actions as in StoreManager.exists(kodo.runtime.KodoStateManager, java.lang.Object), and load additional state if desired. Non-hollow objects will only be included outside of refresh invocations if a user calls getObjectsById 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

Following copied from interface: kodo.runtime.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 context information, or null if not given to the calling method of the persistence manager

Returns:

a collection of the state manager identities for which no data store record exists

changeJDOState

public void changeJDOState(KodoStateManager sm,
                           JDOState fromState,
                           JDOState toState)

Description copied from interface: StoreManager

Notification that the given state manager is about to change its JDO state. The store manager is not required to do anything in this method, but some back ends may need to.

Specified by:

changeJDOState in interface StoreManager

flush

public Collection flush(Collection states)

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 KodoStateManager.setObjectId(java.lang.Object). Datastore version information should be updated during flush, and the state manager's version indicator updated through the KodoStateManager.setNextVersion(java.lang.Object) method. The current version will roll over to this next version upon successful commit.

Specified by:

flush in interface StoreManager

cancelAll

public boolean cancelAll()

Description copied from interface: StoreManager

Cancel all pending data store statements.

Specified by:

cancelAll in interface StoreManager

Following copied from interface: kodo.runtime.StoreManager

Returns:

true if any statements cancelled, false otherwise

getPersistenceCapableClass

public Class getPersistenceCapableClass(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:

getPersistenceCapableClass in interface StoreManager

assignObjectId

public boolean assignObjectId(KodoStateManager sm)

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. This method is called the first time a user requests the oid of a new instance before flush.

Specified by:

assignObjectId in interface StoreManager

Following copied from interface: kodo.runtime.StoreManager

See Also:

kodo.util.ApplicationIds#create

getDataStoreIdClass

public Class getDataStoreIdClass(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:

getDataStoreIdClass in interface StoreManager

copyDataStoreId

public Object copyDataStoreId(Object oid,
                              ClassMetaData meta)

Description copied from interface: StoreManager

Copy the given object id value.

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

newDataStoreId

public Id newDataStoreId(long id,
                         ClassMapping mapping)

Create a new datastore identity object from the given id value and mapping.

newExtent

public KodoExtent newExtent(Class cls,
                            boolean subclasses)

Description copied from interface: StoreManager

Return an extent of the given candidate class, optionally including subclasses. If the extent is iterated within a data store transaction, returned instances should be locked.

Specified by:

newExtent in interface StoreManager

newQuery

public KodoQuery newQuery(String language)

Description copied from interface: StoreManager

Return a query implementation suitable for this runtime. If the query is iterated within a data store transaction, returned instances should be locked.

Specified by:

newQuery in interface StoreManager

Following copied from interface: kodo.runtime.StoreManager

Parameters:

language - the query language; implementations are only required to support javax.jdo.query.JDOQL

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

getSequenceGenerator

public SequenceGenerator getSequenceGenerator(ClassMetaData meta)

Description copied from interface: StoreManager

Returns a SequenceGenerator for the specified class.

Specified by:

getSequenceGenerator 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

isActive

public boolean isActive()

Return whether there is a datastore transaction active.

getJDBCLockManager

public JDBCLockManager getJDBCLockManager()

Return the jdbc lock manager, or null if the lock manager does not implement JDBCLockManager.

getJDBCConnection

public Connection getJDBCConnection()

Return a SQL connection to the database. This method is equivalent to StoreManager.getConnection(), but does not require you to cast the returned object to a SQL connection. The close method should always be called on the connection to free any resources it is using. When appropriate, the close method is implemented as a no-op.

loadMappings

public Object loadMappings(ClassMapping mapping,
                           JDBCFetchConfiguration fetch,
                           BitSet exclude,
                           Result result)
                    throws SQLException

For implementation use only. Load the object in the current row of the given result.

load

public Object load(Object oid,
                   JDBCFetchConfiguration fetch)

Load the object with the given oid.

getCount

public int getCount(Select sel)
             throws SQLException

Return the count for the given query.

selectMappings

public boolean selectMappings(Select sel,
                              ClassMapping mapping,
                              int subs,
                              KodoStateManager sm,
                              BitSet fields,
                              JDBCFetchConfiguration fetch,
                              int eager,
                              boolean ident)

For implementation use only. Return a select for the proper mappings. Return null if no select is needed. The method is designed to be complementary to the load methods.

Parameters:

sel - select to build on

mapping - the mapping for the base type to select for

subs - whether the select might include subclasses of the given mapping

sm - state manager if an instance is being loaded or initialized, else null

fields - if a state manager is being loaded, the set of fields that must be loaded in JDO order, else null

fetch - the fetch configuration; used if no specific fields must be loaded, and used when selecting relations

eager - eager fetch mode to use

ident - whether to select primary key columns as distinct identifiers

Returns:

true if the select is required, false otherwise

loadSubclasses

public void loadSubclasses(ClassMapping mapping)

Makes sure all subclasses of the given type are loaded in the JVM. This is usually done automatically.

addClassConditions

public boolean addClassConditions(Select sel,
                                  ClassMapping mapping,
                                  boolean subs,
                                  Joins joins)

Add WHERE conditions to the given select limiting the returned results to the given mapping type, possibly including subclasses.

Returns:

true if the mapping was joined down to its base class in order to add the conditions