/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Feb 16, 2007
*/
package com.bigdata.journal;
import java.nio.ByteBuffer;
import com.bigdata.io.ChecksumUtility;
/**
* Test the ability to rollback a commit.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @deprecated Along with {@link AbstractJournal#rollback()}
*/
public class TestRollbackCommit extends ProxyTestCase<Journal> {
/**
*
*/
public TestRollbackCommit() {
}
/**
* @param name
*/
public TestRollbackCommit(String name) {
super(name);
}
public void test_rollback() {
final Journal journal = new Journal(getProperties());
try {
final ChecksumUtility checker = new ChecksumUtility();
final ByteBuffer rootBlock0 = journal.getBufferStrategy()
.readRootBlock(true/* rootBlock0 */);
final IRootBlockView rootBlockView0 = new RootBlockView(
true/* rootBlock0 */, rootBlock0, checker);
if (log.isInfoEnabled())
log.info("rootBlock0=" + rootBlockView0);
final ByteBuffer rootBlock1 = journal.getBufferStrategy()
.readRootBlock(false/* rootBlock0 */);
final IRootBlockView rootBlockView1 = new RootBlockView(
false/* rootBlock0 */, rootBlock1, checker);
if (log.isInfoEnabled())
log.info("rootBlock1=" + rootBlockView1);
// true iff rootBlock0 is the current root block.
final boolean isRootBlock0 = journal.getRootBlockView()
.isRootBlock0();
if (log.isInfoEnabled())
log.info("Using rootBlock=" + (isRootBlock0 ? 0 : 1));
// write a record.
journal.write(getRandomData());
// commit the journal.
journal.commit();
if (log.isInfoEnabled())
log.info("After commit =" + journal.getRootBlockView());
// verify that the other root block is now the current one.
assertNotSame(isRootBlock0, journal.getRootBlockView()
.isRootBlock0());
journal.rollback();
if (log.isInfoEnabled())
log.info("After rollback =" + journal.getRootBlockView());
// verify that the state of rootBlock0 is as before the commit.
assertRootBlockOk(journal, rootBlock0, true/* isRootBlock0 */);
// verify that the state of rootBlock1 is as before the commit.
assertRootBlockOk(journal, rootBlock1, false/* isRootBlock0 */);
} finally {
journal.destroy();
}
}
private void assertRootBlockOk(final Journal journal,
final ByteBuffer expected, final boolean isRootBlock0) {
final ByteBuffer actual = journal.getBufferStrategy().readRootBlock(
isRootBlock0);
final boolean ok = expected.equals(actual);
if (!ok) {
final StringBuffer sb = new StringBuffer();
sb.append("Root blocks differ: delegate=" + getDelegate()
+ ", bufferStrategy=" + journal.getBufferStrategy());
sb
.append(", expected="
+ new RootBlockView(isRootBlock0, expected, null/* checker */));
try {
sb
.append(", actual="
+ new RootBlockView(isRootBlock0, expected,
null/* checker */));
} catch (Throwable t) {
/*
* Show the error if we can't decode the root block.
*/
fail(sb.toString(), t);
}
fail(sb.toString());
}
}
}