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TestShutdownSequence.java
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TestShutdownSequence.java
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/*
* Copyright (c) 2002-2018 "Neo4j,"
* Neo4j Sweden AB [http://neo4j.com]
*
* This file is part of Neo4j.
*
* Neo4j 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, either version 3 of the License, or
* (at your option) any later version.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.core;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.util.concurrent.atomic.AtomicInteger;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.event.ErrorState;
import org.neo4j.graphdb.event.KernelEventHandler;
import org.neo4j.io.fs.FileSystemAbstraction;
import org.neo4j.kernel.internal.GraphDatabaseAPI;
import org.neo4j.test.TestGraphDatabaseFactory;
import static org.junit.Assert.assertEquals;
public class TestShutdownSequence
{
private GraphDatabaseService graphDb;
@Before
public void createGraphDb()
{
graphDb = new TestGraphDatabaseFactory().newImpermanentDatabase();
}
@Test
public void canInvokeShutdownMultipleTimes()
{
graphDb.shutdown();
graphDb.shutdown();
}
@Test
public void eventHandlersAreOnlyInvokedOnceDuringShutdown()
{
final AtomicInteger counter = new AtomicInteger();
graphDb.registerKernelEventHandler( new KernelEventHandler()
{
@Override
public void beforeShutdown()
{
counter.incrementAndGet();
}
@Override
public Object getResource()
{
return null;
}
@Override
public void kernelPanic( ErrorState error )
{
// do nothing
}
@Override
public ExecutionOrder orderComparedTo( KernelEventHandler other )
{
return ExecutionOrder.DOESNT_MATTER;
}
} );
graphDb.shutdown();
graphDb.shutdown();
assertEquals( 1, counter.get() );
}
@Test
public void canRemoveFilesAndReinvokeShutdown() throws IOException
{
GraphDatabaseAPI databaseAPI = (GraphDatabaseAPI) this.graphDb;
FileSystemAbstraction fileSystemAbstraction = getDatabaseFileSystem( databaseAPI );
graphDb.shutdown();
fileSystemAbstraction.deleteRecursively( databaseAPI.databaseDirectory() );
graphDb.shutdown();
}
@Test
public void canInvokeShutdownFromShutdownHandler()
{
graphDb.registerKernelEventHandler( new KernelEventHandler()
{
@Override
public void beforeShutdown()
{
graphDb.shutdown();
}
@Override
public Object getResource()
{
return null;
}
@Override
public void kernelPanic( ErrorState error )
{
// do nothing
}
@Override
public ExecutionOrder orderComparedTo( KernelEventHandler other )
{
return ExecutionOrder.DOESNT_MATTER;
}
} );
graphDb.shutdown();
}
private static FileSystemAbstraction getDatabaseFileSystem( GraphDatabaseAPI databaseAPI )
{
return databaseAPI.getDependencyResolver().resolveDependency( FileSystemAbstraction.class );
}
}