Examples of org.apache.ojb.broker.util.sequence.SequenceManager

org.apache.ojb.broker.util.sequence.SequenceManager

SequenceManagers are responsible for creating new unique ID's - unique accross all "extent" object declarations in OJB metadata. There are some standard sequence manager implementations in this package.

SequenceManager objects are obtained from a factory class called {@link SequenceManagerFactory}. This Factory can be configured to provide instances of user defined implementors of this interface.

NOTE: SequenceManagers should be aware of "extents" ("extent" is an OJB inheritance feature), that is: if you ask for an uid for an Interface (more exact for one implementor class) with several implementor classes, or a baseclass with several subclasses the returned uid should be unique accross all tables representing objects of the extent in question. @version $Id: SequenceManager.java,v 1.10.2.6 2005/12/21 22:28:41 tomdz Exp $

    public void testObjectsFromAbstractBaseClass1() throws Exception
    {
        PersistenceBroker broker = PersistenceBrokerFactory.defaultPersistenceBroker();
        try
        {
            SequenceManager sm = broker.serviceSequenceManager();
            FieldDescriptor fld_1 = broker.getClassDescriptor(SMObjectOne.class).getAutoIncrementFields()[0];
            FieldDescriptor fld_2 = broker.getClassDescriptor(SMObjectTwo.class).getAutoIncrementFields()[0];


            Object result_1 = sm.getUniqueValue(fld_1);
            Object result_2 = sm.getUniqueValue(fld_2);


            assertNotNull(result_1);
            assertNotNull(result_2);
            assertTrue(result_1 instanceof Integer);
            assertTrue(result_2 instanceof Integer);


            result_1 = sm.getUniqueValue(fld_1);
            result_2 = sm.getUniqueValue(fld_2);


            assertNotNull(result_1);
            assertNotNull(result_2);
            assertTrue(result_1 instanceof Integer);
            assertTrue(result_2 instanceof Integer);

Related Classes of org.apache.ojb.broker.util.sequence.SequenceManager

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