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SubProcessTest.java
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SubProcessTest.java
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/*
* Copyright (c) 2002-2015 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.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.metatest;
import org.junit.Ignore;
import org.junit.Test;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import java.util.concurrent.Callable;
import java.util.concurrent.TimeUnit;
import org.neo4j.test.subprocess.SubProcess;
import static java.util.concurrent.TimeUnit.SECONDS;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertTrue;
public class SubProcessTest
{
private static final String MESSAGE = "message";
@SuppressWarnings( "serial" )
private static class TestingProcess extends SubProcess<Callable<String>, String> implements Callable<String>
{
private String message;
private transient volatile boolean started = false;
@Override
protected void startup( String parameter )
{
message = parameter;
started = true;
}
@Override
public String call() throws Exception
{
while ( !started )
// because all calls are asynchronous
Thread.sleep( 1 );
return message;
}
}
@Test
public void canInvokeSubprocessMethod() throws Exception
{
Callable<String> subprocess = new TestingProcess().start( MESSAGE );
try
{
assertEquals( MESSAGE, subprocess.call() );
}
finally
{
SubProcess.stop( subprocess );
}
}
@Ignore( "not reliable - the processes do exit though" )
@Test
public void subprocessShouldExitWhenParentProcessExits() throws Exception
{
CallbackImpl callback = new CallbackImpl();
Object proc = new ParentProcess().start( callback );
assertTrue( "Subprocess didn't exit properly", callback.isCalled( /*timeout:*/10, SECONDS ) );
SubProcess.kill( proc );
}
private interface Callback extends Remote
{
void callBack() throws RemoteException;
}
private interface Handover extends Remote
{
Callback handOver() throws RemoteException;
}
@SuppressWarnings( "serial" )
private static class CallbackImpl extends UnicastRemoteObject implements Callback
{
private volatile boolean called = false;
protected CallbackImpl() throws RemoteException
{
super();
}
boolean isCalled( int timeout, TimeUnit unit ) throws InterruptedException
{
long end = System.currentTimeMillis() + unit.toMillis( timeout );
while ( !called && System.currentTimeMillis() < end )
Thread.sleep( 1 );
return called;
}
@Override
public void callBack()
{
called = true;
}
}
private static class HandoverImpl extends UnicastRemoteObject implements Handover
{
private volatile boolean called = false;
private final Callback callback;
protected HandoverImpl( Callback callback ) throws RemoteException
{
super();
this.callback = callback;
}
@Override
public Callback handOver() throws RemoteException
{
called = true;
return callback;
}
boolean isCalled( int timeout, TimeUnit unit ) throws InterruptedException
{
long end = System.currentTimeMillis() + unit.toMillis( timeout );
while ( !called && System.currentTimeMillis() < end )
Thread.sleep( 1 );
return called;
}
}
@SuppressWarnings( "serial" )
private static class ParentProcess extends SubProcess<Object, Callback>
{
@Override
protected void startup( Callback parameter ) throws Throwable
{
HandoverImpl handover = new HandoverImpl( parameter );
new ChildProcess().start( handover );
handover.isCalled( /*timeout:*/5, SECONDS );
shutdown();
}
}
@SuppressWarnings( "serial" )
private static class ChildProcess extends SubProcess<Object, Handover>
{
private Callback callback;
@Override
protected synchronized void startup( Handover parameter ) throws Throwable
{
this.callback = parameter.handOver();
}
@Override
protected synchronized void shutdown( boolean normal )
{
try
{
callback.callBack();
}
catch ( RemoteException e )
{
throw new RuntimeException( e );
}
}
}
}