kodo.xmlstore
Class XMLStoreManager

java.lang.Object
  |
  +--kodo.abstractstore.AbstractStoreManager
        |
        +--kodo.xmlstore.XMLStoreManager

All Implemented Interfaces:

com.solarmetric.util.Closeable, StoreManager

public class XMLStoreManager

extends AbstractStoreManager

Store manager to a back-end consisting of XML files. This implementation accesses data through the XMLStore associated with its XMLConfiguration. Configuration instances are shared by all store managers owned by all persistence managers created with the same persistence manager factory.

See Also:

AbstractStoreManager

Inner Class Summary

protected class

XMLStoreManager.XMLExtent Extent implementation for the XMLStoreManager.

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

XMLStoreManager()

Method Summary

void	begin() Kodo assumes that after this method is invoked, all data accesses through this store manager will be part of a single unit of work that can be rolled back.
void	commit() This is a no-op implementation.
boolean	exists(KodoStateManager sm, Object connection) Verify that the given instance exists in the data store; return false if it does not.
protected Collection	flush(Collection pNew, Collection pNewUpdated, Collection pNewFlushedDeleted, Collection pDirty, Collection pDeleted) Responsible for writing modifications happened back to the data store.
SequenceGenerator	getSequenceGenerator(ClassMetaData forClass) Throws a javax.jdo.JDOUnsupportedOptionException.
protected Collection	getUnsupportedOptions() Returns a set of JDO option names that this store manager does not support.
boolean	initialize(KodoStateManager sm, JDOState state, FetchConfiguration fetch, Object connection) This method is invoked when Kodo needs to load an object whose identity is known but which has not yet been loaded from the data store.
boolean	load(KodoStateManager sm, BitSet fields, FetchConfiguration fetch, int lockLevel, Object connection) This method is invoked when Kodo needs to load additional data into an object that has already been at least partially loaded by a previous initialize(kodo.runtime.KodoStateManager, kodo.runtime.JDOState, kodo.runtime.FetchConfiguration, java.lang.Object) invocation.
protected JDOConfiguration	newConfiguration() Return a new configuration instance for this runtime.
KodoExtent	newExtent(Class type, boolean subclasses) Create an KodoExtent capable of loading all instances of type, optionally including subclasses as defined by subclasses.
protected void	open() No-op implementation.
void	rollback() This is a no-op implementation.
boolean	synchVersion(KodoStateManager sm, Object connection) Since this store manager does not provide optimistic locking support, this method always returns true.

Methods inherited from class kodo.abstractstore.AbstractStoreManager

attachVersion, beginOptimistic, cancelAll, changeJDOState, close, compareVersion, copyDataStoreId, detachVersion, flush, getConnection, getDataStoreIdClass, getPersistenceCapableClass, getPersistenceManager, getPlatform, hasConnection, loadAll, newDataStoreId, newDataStoreId, newFetchConfiguration, newQuery, rollbackOptimistic, setPersistenceManager

Methods inherited from class java.lang.Object

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

Constructor Detail

XMLStoreManager

public XMLStoreManager()

Method Detail

getUnsupportedOptions

protected Collection getUnsupportedOptions()

Description copied from class: AbstractStoreManager

Returns a set of JDO option names that this store manager does not support.

This returns [ "javax.jdo.option.Optimistic", "javax.jdo.option.DatastoreIdentity", "kodo.option.IncrementalFlush" ]

Overrides:

getUnsupportedOptions in class AbstractStoreManager

newConfiguration

protected JDOConfiguration newConfiguration()

Description copied from class: AbstractStoreManager

Return a new configuration instance for this runtime. Configuration data is maintained at the persistence manager factory level and is available to all Kodo components; therefore it is a good place to maintain shared resources such as connection pools, etc.

Overrides:

newConfiguration in class AbstractStoreManager

open

protected void open()

Description copied from class: AbstractStoreManager

No-op implementation. Ready this store manager for persistent operations.

Overrides:

open in class AbstractStoreManager

exists

public boolean exists(KodoStateManager sm,
                      Object connection)

Description copied from interface: StoreManager

Verify that the given instance exists in the data store; return false if it does not.

initialize

public boolean initialize(KodoStateManager sm,
                          JDOState state,
                          FetchConfiguration fetch,
                          Object connection)

Description copied from class: AbstractStoreManager

This method is invoked when Kodo needs to load an object whose identity is known but which has not yet been loaded from the data store. sm is a partially-set-up state manager for this object. The ID and least-derived type information for the instance to load can be obtained by invoking sm.getObjectId(false,true) and sm.getMetaData().

When implementing this method, load the data for this object from the data store, determine the most-derived subclass of the newly-loaded data, and then use the #newInstance method to populate sm with a new instance of the appropriate type. Once #newInstance has been invoked, proceed to load field data into sm as in the AbstractStoreManager.load(kodo.runtime.KodoStateManager, java.util.BitSet, kodo.runtime.FetchConfiguration, int, java.lang.Object) method, by using KodoStateManager.store(int, java.lang.Object) (or the appropriate KodoStateManager.storetype method) to put the data into the object.

Overrides:

initialize in class AbstractStoreManager

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

connection - the current connection 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 connection)

Description copied from class: AbstractStoreManager

This method is invoked when Kodo needs to load additional data into an object that has already been at least partially loaded by a previous AbstractStoreManager.initialize(kodo.runtime.KodoStateManager, kodo.runtime.JDOState, kodo.runtime.FetchConfiguration, java.lang.Object) invocation.

Load data into sm by using KodoStateManager.store(int, java.lang.Object) (or the appropriate KodoStateManager.storetype method) to put the data into the object.

Overrides:

load in class AbstractStoreManager

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

connection - the current connection 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

synchVersion

public boolean synchVersion(KodoStateManager sm,
                            Object connection)

Description copied from class: AbstractStoreManager

Since this store manager does not provide optimistic locking support, this method always returns true.

Overrides:

synchVersion in class AbstractStoreManager

Following copied from interface: kodo.runtime.StoreManager

Parameters:

sm - the instance to check

connection - the current connection 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

begin

public void begin()

Description copied from class: AbstractStoreManager

Kodo assumes that after this method is invoked, all data accesses through this store manager will be part of a single unit of work that can be rolled back.

This is a no-op implementation. If your data store does not support any concept of locking or transactions, you need not override this method.

Overrides:

begin in class AbstractStoreManager

commit

public void commit()

Description copied from class: AbstractStoreManager

This is a no-op implementation. If your data store does not have a concept of transactions or a unit of work, you need not override this method. If it does, then override this method to notify the data store that the current transaction should be committed.

Overrides:

commit in class AbstractStoreManager

rollback

public void rollback()

Description copied from class: AbstractStoreManager

This is a no-op implementation. If your data store does not have a concept of transactions or a unit of work, you need not override this method. If it does, then override this method to notify the data store that the current transaction should be rolled back.

Overrides:

rollback in class AbstractStoreManager

flush

protected Collection flush(Collection pNew,
                           Collection pNewUpdated,
                           Collection pNewFlushedDeleted,
                           Collection pDirty,
                           Collection pDeleted)

Description copied from class: AbstractStoreManager

Responsible for writing modifications happened back to the data store. If you do not remove the JDOConfiguration.OPTION_INC_FLUSH option in AbstractStoreManager.getUnsupportedOptions(), this will be called only once at the end of a transaction. Otherwise, it may be called periodically throughout the course of a transaction.

If this store manager supports optimistic transactions, datastore version information should be updated during flush, and the state manager's version indicator should be updated through the KodoStateManager.setNextVersion(java.lang.Object) method.

This method will only be invoked if there are meaningful changes to store. This differs from the behavior of StoreManager.flush(java.util.Collection), which may be invoked with a collection of objects in JDO states that do not require any datastore action (for example, objects in the transient-transactional state).

Overrides:

flush in class AbstractStoreManager

Following copied from class: kodo.abstractstore.AbstractStoreManager

Parameters:

pNew - Objects that should be added to the store, and that have not previously been flushed.

pNewUpdated - New objects that have been modified since they were initially flushed. These were in persistentNew in an earlier flush invocation.

pNewFlushedDeleted - New objects that have been deleted since they were initially flushed. These were in persistentNew in an earlier flush invocation.

pDirty - Objects that were loaded from the data store and have since been modified.

pDeleted - Objects that were loaded from the data store and have since been deleted. These may have been in a previous flush invocation's persistentDirty list.

Returns:

a collection of OptimisticVerificationExceptions encountered during flushing.

newExtent

public KodoExtent newExtent(Class type,
                            boolean subclasses)

Description copied from class: AbstractStoreManager

Create an KodoExtent capable of loading all instances of type, optionally including subclasses as defined by subclasses.

This will typically return an instance of a class that extends ExtentImpl, defining ExtentImpl.getResultObjectProvider(kodo.meta.ClassMetaData) to return a ResultObjectProvider capable of iterating through all the desired objects for a given ClassMetaData. Note that there might be multiple calls to that method if type identifies an interface or abstract class with multiple persistence-capable implementations.

The implementation of the ExtentImpl.getResultObjectProvider(kodo.meta.ClassMetaData) method will typically execute some sort of data store query to find all the applicable objects, loop through the returned data, extracting object IDs from the data, and invoking #getObjectById(Object,FetchConfiguration,Object) on each OID. When invoking this method, the first argument is the OID. The second is the current fetch configuration (this can be null). The last argument is an object that will be passed through to AbstractStoreManager.initialize(kodo.runtime.KodoStateManager, kodo.runtime.JDOState, kodo.runtime.FetchConfiguration, java.lang.Object) or AbstractStoreManager.load(kodo.runtime.KodoStateManager, java.util.BitSet, kodo.runtime.FetchConfiguration, int, java.lang.Object), and typically will contain the actual data to load. For example, for a JDBC-based store manager, this might be the result set that is being iterated over. If this argument is null, then the AbstractStoreManager.initialize(kodo.runtime.KodoStateManager, kodo.runtime.JDOState, kodo.runtime.FetchConfiguration, java.lang.Object) or AbstractStoreManager.load(kodo.runtime.KodoStateManager, java.util.BitSet, kodo.runtime.FetchConfiguration, int, java.lang.Object) method will have to issue another command to the data store in order to fetch the data to be loaded.

Overrides:

newExtent in class AbstractStoreManager

getSequenceGenerator

public SequenceGenerator getSequenceGenerator(ClassMetaData forClass)

Description copied from class: AbstractStoreManager

Throws a javax.jdo.JDOUnsupportedOptionException. Override this method to provide datastore identity by using Kodo's Id class, which uses a long as the per-class identifier. To use some other sort of datastore identifier (a GUID, string, or someting of that nature), override AbstractStoreManager.getPersistenceCapableClass(java.lang.Object), AbstractStoreManager.getDataStoreIdClass(kodo.meta.ClassMetaData), .

Overrides:

getSequenceGenerator in class AbstractStoreManager