/*******************************************************************************
 * 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.impl.procedure;

import java.util.ArrayList;
import java.util.concurrent.atomic.AtomicBoolean;

import org.simantics.db.AsyncReadGraph;
import org.simantics.db.common.utils.Logger;
import org.simantics.db.impl.query.QueryProcessor.AsyncBarrier;
import org.simantics.db.procedure.AsyncMultiProcedure;

public class ResultCallWrappedQueryProcedure4<Result> implements AsyncMultiProcedure<Result> {

    final private ArrayList<Result> result;
    private Throwable exception = null;
    final private AsyncMultiProcedure<Result> procedure;
    final private AtomicBoolean latch;
    
    public ResultCallWrappedQueryProcedure4(AsyncMultiProcedure<Result> procedure) {
        this.procedure = procedure;
        latch = new AtomicBoolean(false);
        result = new ArrayList<Result>();
    }
    
    @Override
    public void execute(AsyncReadGraph graph, Result result) {
    	try {
            synchronized(this.result) {
                this.result.add(result);
            }
    		procedure.execute(graph, result);
    	} catch (Throwable t) {
    		Logger.defaultLogError("AsyncMultiProcedure.execute failed for " + procedure, t);
    	}
    }
    
    @Override
    public void finished(AsyncReadGraph graph) {
    	if(latch.compareAndSet(false, true)) {
        	try {
                procedure.finished(graph);
        	} catch (Throwable t) {
        		Logger.defaultLogError("AsyncMultiProcedure.exception failed for " + procedure, t);
        	} finally {
        	}
    	} else {
        	Logger.defaultLogError("Finished or exception was called many times (this time is finished)");
    	}
    }

    @Override
    public void exception(AsyncReadGraph graph, Throwable t) {
    	if(latch.compareAndSet(false, true)) {
        	try {
                this.exception = t;
                procedure.exception(graph, t);
        	} catch (Throwable throwable) {
        		Logger.defaultLogError("AsyncMultiProcedure.exception failed for " + procedure, throwable);
        	} finally {
        	}
    	} else {
        	Logger.defaultLogError("Finished or exception was called many times (this time is exception)");
    	}
    }
    
    public ArrayList<Result> getResult() {
        return result;
    }
    
    public Throwable getException() {
        return exception;
    }

    @Override
    public String toString() {
        return "ResultCallWrappedQueryProcedure4[" + procedure + "]"; 
    }
    
}