/*******************************************************************************
 * 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.HashSet;
import java.util.concurrent.Semaphore;
import java.util.concurrent.TimeUnit;

import org.junit.Test;
import org.simantics.db.AsyncReadGraph;
import org.simantics.db.ReadGraph;
import org.simantics.db.Session;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.procedure.AsyncProcedure;
import org.simantics.db.procedure.SyncProcedure;
import org.simantics.db.request.AsyncRead;
import org.simantics.db.testing.annotation.Fails;
import org.simantics.db.testing.base.TestCommonPerf;
import org.simantics.layer0.Layer0;

public class SyncRequestTest extends TestCommonPerf {
    
    private static final int COUNT = 1000000;

    private static final int DEADLINE = 10000;
    
	@Test(timeout=5000)
	@Fails
    public void test() throws Exception {

        final Session session = getSession();
        final Layer0 b = Layer0.getInstance(session);
        
        final HashSet<Integer> check = new HashSet<Integer>();
        for(int i=0;i<COUNT;i++) check.add(i);
        
        final Semaphore s = new Semaphore(0);
        
        long start = System.nanoTime();
        
        session.asyncRequest(new AsyncRead<String>() {

            @Override
            public void perform(AsyncReadGraph graph, AsyncProcedure<String> procedure) {
                for(int i=0;i<COUNT;i++) {
                    
                    final int index = i;
                    
                    graph.forPossibleRelatedValue(rl, b.HasName, new SyncProcedure<String>() {

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

                        @Override
                        public void execute(ReadGraph graph, String result) throws DatabaseException {
                            synchronized(check) {
                                check.remove(index);
                                if(check.isEmpty()) s.release();
                            }
                        }
                        
                    });

                }
                
            }

            @Override
		    public int threadHash() {
		    	return hashCode();
		    }

            @Override
            public int getFlags() {
                return 0;
            }

        });
        
        boolean success = s.tryAcquire(DEADLINE, TimeUnit.MILLISECONDS);
        assert(success);
        
        long end = System.nanoTime();
        if (DEBUG)
            System.out.println("success in " + 1e-9*(double)(end-start) + " s.");
        
    }
}