/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.db.tests.api.request.external;

import java.util.HashSet;
import java.util.concurrent.Semaphore;

import org.junit.Test;
import org.simantics.db.ReadGraph;
import org.simantics.db.Session;
import org.simantics.db.common.request.SingletonPrimitiveRead;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.procedure.Listener;
import org.simantics.db.request.Read;
import org.simantics.db.testing.annotation.Fails;
import org.simantics.db.testing.base.ExistingDatabaseTest;
import org.simantics.layer0.Layer0;

public class ExternalRequestTest4 extends ExistingDatabaseTest {
	
	private Error exception;
	
	boolean listenerAlive = true;

	int counter = 0;	
	HashSet<Listener<String>> listeners = new HashSet<Listener<String>>();
	
    class Primitive extends SingletonPrimitiveRead<String> {

        @Override
        public void register(ReadGraph graph, Listener<String> procedure) {

            listeners.add(procedure);
            procedure.execute("Result" + counter);
            
        }
        
    }

    public void fireNewPrimitive() {
        counter++;
        for(Listener<String> listener : listeners) listener.execute("Result" + counter);
    }
    
	@Test
	@Fails
	public void test() throws Exception {
		
		Session session = getSession();
		
		final Semaphore s1 = new Semaphore(-6);
        final Semaphore s2 = new Semaphore(-6);
		
		session.syncRequest(new Read<String>() {

            @Override
            public String perform(ReadGraph graph) throws DatabaseException {
                
                Layer0 b = Layer0.getInstance(graph);
                String base = graph.getRelatedValue(graph.getRootLibrary(), b.HasName);
                String appendix = graph.syncRequest(new Primitive());
                return base + appendix;
                
            }
			
		}, new Listener<String>() {

            @Override
            public void exception(Throwable t) {
            }

            @Override
            public void execute(String result) {
                s1.release();
            }

            @Override
            public boolean isDisposed() {
                return !listenerAlive;
            }
		    
		});

		fireNewPrimitive();
        fireNewPrimitive();
        fireNewPrimitive();

        Thread.sleep(500);

        session.syncRequest(new Read<String>() {

            @Override
            public String perform(ReadGraph graph) throws DatabaseException {
                
                Layer0 b = Layer0.getInstance(graph);
                String base = graph.getRelatedValue(graph.getRootLibrary(), b.HasName);
                String appendix = graph.syncRequest(new Primitive());
                return base + appendix;
                
            }
            
        }, new Listener<String>() {

            @Override
            public void exception(Throwable t) {
            }

            @Override
            public void execute(String result) {
                s2.release();
            }

            @Override
            public boolean isDisposed() {
                return false;
            }
            
        });

        fireNewPrimitive();
        fireNewPrimitive();
        fireNewPrimitive();

        Thread.sleep(500);
        listenerAlive = false;

        fireNewPrimitive();
        fireNewPrimitive();
        fireNewPrimitive();
        
        s1.acquire();
        s2.acquire();
        
		if(exception != null) {
			fail("Write transaction threw and exception (" + exception.getMessage() + ") which was not passed through ");
		}
		
	}

}