/*******************************************************************************
* Copyright (c) 1998, 2015 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.unitofwork.transactionisolation;
import org.eclipse.persistence.descriptors.ClassDescriptor;
import org.eclipse.persistence.testing.models.employee.domain.Employee;
/**
* Tests the Session read refactoring / reading through the write connection
* properly feature.
* <p>
* Tests the interaction of building clones from rows in transaction and
* the descriptor setting alwaysRefreshIdentityMapResult.
* <p>
* Two things could have gone wrong. a) since this only refreshes the originals
* we might do nothing and not refresh, since we skip all that original only code.
* b) we refresh the originals from the write connection.
* <p>
* The combination of these two features provide perfect support for transaction
* isolation. If in transaction and no original in cache, will not put one in.
* If always refreshing will never use what is in there, for we would have to
* refresh it from a dirty row. However objects are still put in the shared
* cache after commit, and read object queries can get cache hits without
* checking if always refresh is true.
* <p>
* The only question is whether a cache hit can succeed if set to always refresh
* @version $Header: TransactionIsolationAlwaysRefreshTest.java 02-nov-2005.16:17:07 jsutherl Exp $
* @author smcritch
* @since release specific (what release of product did this appear in)
*/
public class TransactionIsolationAlwaysRefreshTest extends TransactionIsolationRefreshTest {
boolean didRefresh;
protected void setup() throws Exception {
super.setup();
// Must override otherwise test is meaningless.
refreshQuery.dontRefreshIdentityMapResult();
// This is to guarantee going to database, in the descriptor refreshing case
// don't automatically.
refreshQuery.dontMaintainCache();
ClassDescriptor descriptor = getSession().getClassDescriptor(Employee.class);
didRefresh = descriptor.shouldAlwaysRefreshCache();
descriptor.setShouldAlwaysRefreshCache(true);
}
public void reset() throws Exception {
super.reset();
ClassDescriptor descriptor = getSession().getClassDescriptor(Employee.class);
descriptor.setShouldAlwaysRefreshCache(didRefresh);
}
}