foundation/eclipselink.core.test/src/org/eclipse/persistence/testing/tests/sessioncache/ReadObjectAlreadyInSessionCacheTest.java

/*******************************************************************************
 * Copyright (c) 1998, 2013 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the 
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 
 * which accompanies this distribution. 
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at 
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
 ******************************************************************************/  
package org.eclipse.persistence.testing.tests.sessioncache;

import org.eclipse.persistence.queries.*;
import org.eclipse.persistence.sessions.UnitOfWork;
import org.eclipse.persistence.testing.models.employee.domain.*;
import org.eclipse.persistence.testing.framework.*;

public class ReadObjectAlreadyInSessionCacheTest extends TestCase {
    private Employee objectInCache;
    private int newSalary;

    public ReadObjectAlreadyInSessionCacheTest() {
        setDescription("The test that change are merged into the object in the session cache");
    }

    protected void setup() {
        checkNoWaitSupported();

        // Flush the cache 
        getSession().getIdentityMapAccessor().initializeIdentityMaps();
        //now read an employee so it's in the session cache        
        objectInCache = (Employee)getSession().readObject(Employee.class);

        getAbstractSession().beginTransaction();
    }

    protected void test() {
        UnitOfWork uow = getSession().acquireUnitOfWork();
        ReadObjectQuery query = new ReadObjectQuery(objectInCache);
        query.setLockMode(ObjectLevelReadQuery.LOCK_NOWAIT);
        Employee emp = (Employee)uow.executeQuery(query);
        newSalary = emp.getSalary() + 1;
        emp.setSalary(newSalary);
        uow.commit();
    }

    protected void verify() {
        //ensure changes were merged into the session cache
        Employee verifyObject = (Employee)getSession().readObject(objectInCache);
        int salary = verifyObject.getSalary();
        if (salary != newSalary) {
            throw new TestErrorException("Changes were not merged into Session Cache");
        }
    }

    public void reset() throws Exception {
        getAbstractSession().rollbackTransaction();
        getSession().getIdentityMapAccessor().initializeAllIdentityMaps();
    }
}