/*******************************************************************************
 * 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.layer0.utils.queries;

import org.simantics.db.AsyncReadGraph;
import org.simantics.db.RequestProcessor;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.procedure.adapter.AsyncMultiProcedureAdapter;
import org.simantics.db.common.request.ReadRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.procedure.AsyncListener;
import org.simantics.db.procedure.AsyncMultiProcedure;
import org.simantics.db.request.AsyncMultiRead;

@Deprecated
public abstract class QueryExecutor2 extends ReadRequest implements AsyncListener<Object> {

//	Object DUMMY = new Object();
//	
//	@Override
//	public void perform(SyncReadGraph graph,
//		SingleQueryProcedure4<Object> procedure) {
//		doPerform(graph);
//		procedure.execute(graph, DUMMY);
//		
//	}
	
//	protected abstract void doPerform(SyncReadGraph g);
	
	@Override
	public void execute(AsyncReadGraph graph, Object result) {
	}

	public void execute(WriteGraph graph) throws DatabaseException {
		graph.syncRequest(QueryExecutor2.this, QueryExecutor2.this);
	}

	public void execute(RequestProcessor processor) throws DatabaseException {
		
		AsyncMultiRead<Object> request = new AsyncMultiRead<Object>() {

			@Override
			public int threadHash() {
				return hashCode();
			}
			
			@Override
			public void perform(AsyncReadGraph graph,
					AsyncMultiProcedure<Object> callback) {
				graph.asyncRequest(QueryExecutor2.this, QueryExecutor2.this);
				callback.finished(graph);
			}
			
		}; 
		
		AsyncMultiProcedureAdapter<Object> procedure = new AsyncMultiProcedureAdapter<Object>() {

			@Override
			public void exception(AsyncReadGraph graph, Throwable t) {
				t.printStackTrace();
			}
			
		}; 
		
		if(processor instanceof WriteGraph) processor.syncRequest(request, procedure);
		else processor.asyncRequest(request, procedure);
		
	}

	@Override
	public void exception(AsyncReadGraph graph, Throwable t) {
		t.printStackTrace();
	}
	
}