/*******************************************************************************
 * (c) Copyright 2014 Hewlett-Packard Development Company, L.P.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Apache License v2.0 which accompany this distribution.
 *
 * The Apache License is available at
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 *******************************************************************************/
package io.cloudslang.lang.systemtests;

import io.cloudslang.lang.runtime.events.LanguageEventData;
import io.cloudslang.score.events.ScoreEvent;
import io.cloudslang.score.events.ScoreEventListener;

import java.util.ArrayList;
import java.util.List;

/**
 * Date: 4/8/2015
 *
 * @author Bonczidai Levente
 */
public abstract class AbstractAggregatorListener implements ScoreEventListener {

    private final List<LanguageEventData> events = new ArrayList<>();

    public List<LanguageEventData> getEvents() {
        return events;
    }

    @Override
    public void onEvent(ScoreEvent event) throws InterruptedException {
        LanguageEventData languageEvent = (LanguageEventData) event.getData();
        events.add(languageEvent);
    }

}

@@ -1047,16 +1047,29 @@
  public 
+synchronized 
 void onE

make onEvent synchronized