/**
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 Nov 2, 2010
*/
package com.bigdata.bop.fed;
import java.lang.ref.WeakReference;
import java.util.Properties;
import junit.framework.TestCase2;
import com.bigdata.bop.engine.QueryEngine;
import com.bigdata.journal.BufferMode;
import com.bigdata.journal.Journal;
import com.bigdata.util.Bytes;
/**
* Stress test for correct shutdown of query controllers as allocated by the
* {@link QueryEngineFactory}.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id$
*/
public class TestQueryEngineFactory extends TestCase2 {
/**
*
*/
public TestQueryEngineFactory() {
}
/**
* @param name
*/
public TestQueryEngineFactory(String name) {
super(name);
}
public void test_basics() {
final Properties properties = new Properties();
properties.setProperty(Journal.Options.BUFFER_MODE,
BufferMode.Transient.toString());
properties.setProperty(Journal.Options.INITIAL_EXTENT, ""
+ Bytes.megabyte * 10);
final Journal jnl = new Journal(properties);
try {
// does not exist yet.
assertNull(QueryEngineFactory.getInstance().getExistingQueryController(jnl));
// was not created.
assertNull(QueryEngineFactory.getInstance().getExistingQueryController(jnl));
final QueryEngine queryEngine = QueryEngineFactory.getInstance().getQueryController(jnl);
// still exists and is the same reference.
assertTrue(queryEngine == QueryEngineFactory.getInstance().getExistingQueryController(jnl));
} finally {
jnl.destroy();
}
}
/**
* Look for a memory leak in the {@link QueryEngineFactory}.
*
* @throws InterruptedException
*/
public void test_memoryLeak() throws InterruptedException {
// This test currently fails.... [this has been fixed.]
// fail("See https://sourceforge.net/apps/trac/bigdata/ticket/196.");
final int limit = 200;
final Properties properties = new Properties();
properties.setProperty(Journal.Options.BUFFER_MODE,
BufferMode.Transient.toString());
properties.setProperty(Journal.Options.INITIAL_EXTENT, ""
+ Bytes.megabyte * 10);
int ncreated = 0;
/*
* An array of weak references to the journals. These references will
* not cause the journals to be retained. However, since we can not
* force a major GC, the non-cleared references are used to ensure that
* all journals are destroyed by the end of this test.
*/
final WeakReference<Journal>[] refs = new WeakReference[limit];
try {
try {
for (int i = 0; i < limit; i++) {
final Journal jnl = new Journal(properties);
refs[i] = new WeakReference<Journal>(jnl);
// does not exist yet.
assertNull(QueryEngineFactory.getInstance()
.getExistingQueryController(jnl));
// was not created.
assertNull(QueryEngineFactory.getInstance()
.getExistingQueryController(jnl));
final QueryEngine queryEngine = QueryEngineFactory.getInstance()
.getQueryController(jnl);
// still exists and is the same reference.
assertTrue(queryEngine == QueryEngineFactory.getInstance()
.getExistingQueryController(jnl));
ncreated++;
}
} catch (OutOfMemoryError err) {
log.error("Out of memory after creating " + ncreated
+ " query controllers.");
}
// Demand a GC.
System.gc();
// Wait for it.
Thread.sleep(1000/* ms */);
if (log.isInfoEnabled())
log.info("Created " + ncreated + " query controllers.");
final int nalive = QueryEngineFactory.getInstance().getQueryControllerCount();
if (log.isInfoEnabled())
log.info("There are " + nalive
+ " query controllers which are still alive.");
if (nalive == ncreated) {
fail("No query controllers were finalized.");
}
} finally {
/*
* Ensure that all journals are destroyed by the end of the test.
*/
for (int i = 0; i < refs.length; i++) {
final Journal jnl = refs[i] == null ? null : refs[i].get();
if (jnl != null) {
jnl.destroy();
}
}
}
}
}