Examples of oracle.toplink.essentials.internal.sessions.AbstractSession

Package oracle.toplink.essentials.internal.sessions

Examples of oracle.toplink.essentials.internal.sessions.AbstractSession

oracle.toplink.essentials.internal.sessions.AbstractSession
Implementation of oracle.toplink.essentials.sessions.Session The public interface should be used by public API and testing, the implementation should be used internally. @see oracle.toplink.essentials.sessions.Session
Purpose: Define the interface and common protocol of a TopLink compliant session.
Description: The session is the primary interface into TopLink, the application should do all of its reading and writing of objects through the session. The session also manages transactions and units of work. Normally the session is passed and used by the application controler objects. Controler objects normally sit behind the GUI and perform the buiness processes required for the application, they should perform all explict database access and database access should be avoided from the domain object model. Do not use a globally accessable session instance, doing so does not allow for multiple sessions. Multiple sessions may required when performing things like data migration or multiple database access, as well the unit of work feature requires the usage of multiple session instances. Although session is abstract, any users of its subclasses should only cast the variables to Session to allow usage of any of its subclasses.
Responsibilities:
- Connecting/disconnecting.
- Reading and writing objects.
- Transaction and unit of work support.
- Identity maps and caching.
@see DatabaseSession


  @Override
  public ConnectionHandle getJdbcConnection(EntityManager em, boolean readOnly)
      throws PersistenceException, SQLException {


    AbstractSession session = (AbstractSession) getSession(em);
    // The connection was already acquired eagerly in beginTransaction,
    // unless lazyDatabaseTransaction was set to true.
    Connection con = session.getAccessor().getConnection();
    return (con != null ? new SimpleConnectionHandle(con) : null);
  }

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  @Override
  public ConnectionHandle getJdbcConnection(EntityManager em, boolean readOnly)
      throws PersistenceException, SQLException {


    AbstractSession session = (AbstractSession) getSession(em);
    // The connection was already acquired eagerly in beginTransaction,
    // unless lazyDatabaseTransaction was set to true.
    Connection con = session.getAccessor().getConnection();
    return (con != null ? new SimpleConnectionHandle(con) : null);
  }

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     * collection based on the changeset
     */
    public void mergeChangesIntoObject(Object target, ChangeRecord changeRecord, Object source, MergeManager mergeManager) {
        ContainerPolicy containerPolicy = getContainerPolicy();
        Object valueOfTarget = null;
        AbstractSession session = mergeManager.getSession();


        //collect the changes into a vector
        HashMap addObjects = ((DirectCollectionChangeRecord)changeRecord).getAddObjectMap();
        HashMap removeObjects = ((DirectCollectionChangeRecord)changeRecord).getRemoveObjectMap();

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     * session.  However once that UnitOfWork commits and the valueholder is merged
     * into the shared cache, the session needs to be reset to the root session, ie.
     * the server session.
     */
    public void releaseWrappedValueHolder() {
        AbstractSession session = getSession();
        if ((session != null) && session.isUnitOfWork()) {
            setSession(session.getRootSession(query));
        }
    }

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     * session.  However once that UnitOfWork commits and the valueholder is merged
     * into the shared cache, the session needs to be reset to the root session, ie.
     * the server session.
     */
    public void releaseWrappedValueHolder() {
        AbstractSession session = getSession();
        if ((session != null) && session.isUnitOfWork()) {
            setSession(session.getRootSession(null));
        }
    }

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     * Get a value from the object and set that in the respective field of the row.
     * But before that check if the reference object is instantiated or not.
     */
    public void writeFromObjectIntoRowForUpdate(WriteObjectQuery query, AbstractRecord databaseRow) {
        Object object = query.getObject();
        AbstractSession session = query.getSession();


        if (!isAttributeValueInstantiated(object)) {
            return;
        }


        if (session.isUnitOfWork()) {
            if (compareObjectsWithoutPrivateOwned(query.getBackupClone(), object, session)) {
                return;
            }
        }

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     * This method will cause the class loader to be compared with the classloader
     * used to load the original session of this name, with this classloader.  If
     * they are not the same then the session will be refreshed.
     */
    public synchronized AbstractSession getSession(String sessionName, ClassLoader objectClassLoader, boolean shouldLoginSession, boolean shouldRefreshSession, boolean shouldCheckClassLoader) {
        AbstractSession session = (AbstractSession)getSessions().get(sessionName);
        if (shouldCheckClassLoader && (session != null) && !session.getDatasourcePlatform().getConversionManager().getLoader().equals(objectClassLoader)) {
            //bug 3766808  if a different classloader is being used then a reload of the session should
            //be completed otherwise failures may occur
            shouldRefreshSession = true;
        }
        if ((session == null) || shouldRefreshSession) {
            if (session != null) {
                if (session.isDatabaseSession() && session.isConnected()) {
                    ((DatabaseSession)session).logout();
                }


                getSessions().remove(sessionName);
            }
        }


        if (session == null) {
            logAndThrowException(SessionLog.WARNING, ValidationException.noSessionFound(sessionName, ""));
        } else if (shouldLoginSession && !session.isConnected()) {
            ((DatabaseSession)session).login();
        }


        return session;
    }

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            //Then do nothing.
            return;
        }


        ContainerPolicy containerPolicy = getContainerPolicy();
        AbstractSession session = mergeManager.getSession();
        Object valueOfTarget = null;


        //At this point the source's indirection must be instantiated or the changeSet would never have
        // been created
        Object sourceAggregate = null;

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    /**
     * INTERNAL:
     * setup the modifyQuery for post insert/update and pre delete
     */
    public InsertObjectQuery getAndPrepareModifyQueryForInsert(ObjectLevelModifyQuery originalQuery, Object object) {
        AbstractSession session = originalQuery.getSession();
        ClassDescriptor objReferenceDescriptor = getReferenceDescriptor(object.getClass(), session);
        InsertObjectQuery insertQueryFromDescriptor = getInsertObjectQuery(session, objReferenceDescriptor);
        insertQueryFromDescriptor.checkPrepare(session, insertQueryFromDescriptor.getModifyRow());


        InsertObjectQuery insertQuery = (InsertObjectQuery)insertQueryFromDescriptor.clone();
        insertQuery.setObject(object);


        AbstractRecord targetForeignKeyRow = new DatabaseRecord();
        Vector referenceObjectKeys = getReferenceObjectKeys(originalQuery);
        for (int keyIndex = 0; keyIndex < getTargetForeignKeyFields().size(); keyIndex++) {
            targetForeignKeyRow.put(getTargetForeignKeyFields().elementAt(keyIndex), referenceObjectKeys.elementAt(keyIndex));
        }


        insertQuery.setModifyRow(targetForeignKeyRow);
        insertQuery.setTranslationRow(targetForeignKeyRow);
        insertQuery.setSession(session);
        insertQuery.setCascadePolicy(originalQuery.getCascadePolicy());
        insertQuery.dontMaintainCache();


        // For bug 2863721 must set a backup clone for compatibility with
        // old event mechanism, even though for AggregateCollections there is no
        // way to get a backup directly from a clone.
        if (session.isUnitOfWork()) {
            Object backupAttributeValue = getReferenceDescriptor(object.getClass(), session).getObjectBuilder().buildNewInstance();
            insertQuery.setBackupClone(backupAttributeValue);
        }
        return insertQuery;
    }

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    /**
     * Each mapping is recursed to assign values from the databaseRow to the attributes in the domain object.
     */
    public void buildAttributesIntoObject(Object domainObject, AbstractRecord databaseRow, ObjectBuildingQuery query, JoinedAttributeManager joinManager, boolean forRefresh) throws DatabaseException {
        AbstractSession executionSession = query.getSession().getExecutionSession(query);


        // PERF: Avoid synchronized enumerator as is concurrency bottleneck.
        Vector mappings = getDescriptor().getMappings();


        // PERF: Cache if all mappings should be read.

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