/*******************************************************************************
 * 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.performance.read;

import org.simantics.db.ReadGraph;
import org.simantics.db.Resource;
import org.simantics.db.VirtualGraph;
import org.simantics.db.WriteOnlyGraph;
import org.simantics.db.common.TransactionPolicyKeep;
import org.simantics.db.common.WriteBindings;
import org.simantics.db.common.request.ReadRequest;
import org.simantics.db.common.request.WriteOnlyResultRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.request.Read;
import org.simantics.db.request.WriteOnlyResult;
import org.simantics.db.service.TransactionPolicySupport;
import org.simantics.db.testing.base.ExistingDatabaseTest;
import org.simantics.layer0.Layer0;

public class WriteReadBigLiteral extends ExistingDatabaseTest {

	private static final int _100MB = 100000000;
	private static final int _250MB = 250000000;
	private static final int _500MB = 500000000;
	private static final int _1000MB = 1000000000;
	private static final int _2000MB = 2000000000;
	
	private Resource time(String label, WriteOnlyResult<Resource> request) throws DatabaseException {

		long start = System.nanoTime();
		Resource result = getSession().syncRequest(request);
		long duration = System.nanoTime() - start;
		System.out.println(label + " = " + 1e-9*duration);
		return result;
		
	}

	private void time(String label, Read<Object> request) throws DatabaseException {

		long start = System.nanoTime();
		getSession().syncRequest(request);
		long duration = System.nanoTime() - start;
		System.out.println(label + " = " + 1e-9*duration);
		
	}
	
	public static WriteOnlyResult<Resource> writeOnly(final int size, VirtualGraph graph) throws DatabaseException {

		final byte[] literal = new byte[size];
		
		return new WriteOnlyResultRequest<Resource>(graph) {

			@Override
			public Resource perform(WriteOnlyGraph graph) throws DatabaseException {
				Resource res = graph.newResource();
				graph.claimValue(res, literal, WriteBindings.BYTE_ARRAY);
				return res;
			}
			
		};
		
	}
	
	public static Read<Object> read(final Resource resource) {

		return new ReadRequest() {
			
			@Override
			public void run(ReadGraph graph) throws DatabaseException {
				
				byte[] value = graph.getValue(resource, WriteBindings.BYTE_ARRAY);
				System.err.println("value: " + value.length);

			}
			
		};
		
	}
	
	public void test() throws Exception {
		
		Layer0.getInstance(getSession());

		getSession().registerService(TransactionPolicySupport.class, new TransactionPolicyKeep());
		
		Resource root = time("write 100MB", writeOnly(_100MB, null));
		time("response 100MB", read(root));
		Resource root2 = time("write 250MB", writeOnly(_250MB, null));
		time("response 250MB", read(root2));
		Resource root3 = time("write 500MB", writeOnly(_500MB, null));
		time("response 500MB", read(root3));
		Resource root4 = time("write 1000MB", writeOnly(_1000MB, null));
		time("response 1000MB", read(root4));
		Resource root5 = time("write 2000MB", writeOnly(_2000MB, null));
		time("response 2000MB", read(root5));
		

////		System.out.println("wait");
////		Thread.sleep(3000);
////		System.out.println("wait done");
//		
//		// Read everything after write
//		time("response", HierarchicalNames.readAsync(root));
//		
////		System.out.println("wait");
////		Thread.sleep(3000);
////		System.out.println("wait done");
//		
//		// Clusters are now loaded
//		time("async", HierarchicalNames.readAsync(root));
////		time("async2", HierarchicalNames.readAsync2(root));
////		time("sync", HierarchicalNames.readSync(root));
////		listenTime("listenSync", HierarchicalNames.readSync(root));

	}

}