/*******************************************************************************
 * 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.misc;

import java.util.Collection;
import java.util.concurrent.atomic.AtomicInteger;

import org.junit.Test;
import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.Session;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.ReadRequest;
import org.simantics.db.common.request.ResourceRead;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.common.request.WriteResultRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.procedure.SyncListener;
import org.simantics.db.testing.base.ExistingDatabaseTest;
import org.simantics.layer0.Layer0;

public class GraphSupportTest extends ExistingDatabaseTest {
	
	@Test
    public void test() throws Exception {
		
    	final AtomicInteger runs = new AtomicInteger(0);
    	
		Session session = getSession();
		
		final Resource test = session.syncRequest(new WriteResultRequest<Resource>() {
            @Override
            public Resource perform(WriteGraph graph) throws DatabaseException {
                return graph.newResource();
            }
		});

		class Request extends ResourceRead<Collection<Resource>> {
			
			public Request(Resource resource) {
				super(resource);
			}

			@Override
			public Collection<Resource> perform(ReadGraph graph) throws DatabaseException {
				return graph.getObjects(resource, Layer0.getInstance(graph).ConsistsOf);
			}
			
		}
		
		session.syncRequest(new ReadRequest() {

			@Override
			public void run(ReadGraph graph) throws DatabaseException {
				
				graph.syncRequest(new Request(test), new SyncListener<Collection<Resource>>() {

					@Override
					public void execute(ReadGraph graph, Collection<Resource> result) throws DatabaseException {
						
						graph.syncRequest(new ReadRequest() {

							@Override
							public void run(ReadGraph graph) throws DatabaseException {
								runs.incrementAndGet();
							}
							
						});
					}

					@Override
					public void exception(ReadGraph graph, Throwable throwable) throws DatabaseException {
					}

					@Override
					public boolean isDisposed() {
						return false;
					}
				});
				
			}
			
		});
		
		assert(runs.get() == 1);

		session.syncRequest(new WriteRequest() {
            @Override
            public void perform(WriteGraph graph) throws DatabaseException {
                graph.claim(test, Layer0.getInstance(graph).ConsistsOf, graph.newResource());
            }
		});

		assert(runs.get() == 2);
		
	}

}