/*-
 * ============LICENSE_START=======================================================
 *  Copyright (C) 2016-2018 Ericsson. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * SPDX-License-Identifier: Apache-2.0
 * ============LICENSE_END=========================================================
 */

package org.onap.policy.apex.examples.adaptive;

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

import org.onap.policy.apex.core.engine.engine.EnEventListener;
import org.onap.policy.apex.core.engine.event.EnEvent;
import org.onap.policy.apex.core.infrastructure.threading.ThreadUtilities;

/**
 * The listener interface for receiving testApexAction events. The class that is interested in processing a
 * testApexAction event implements this interface, and the object created with that class is registered with a component
 * using the component's <code>addTestApexActionListener</code> method. When the testApexAction event occurs, that
 * object's appropriate method is invoked.
 *
 * @author Liam Fallon (liam.fallon@ericsson.com)
 */
public class TestApexActionListener implements EnEventListener {
    private List<EnEvent> resultEvents = new ArrayList<>();

    private final String id;

    /**
     * Instantiates a new test apex action listener.
     *
     * @param id the id
     */
    public TestApexActionListener(final String id) {
        this.id = id;
    }

    /**
     * Gets the result.
     *
     * @return the result
     */
    public EnEvent getResult() {
        while (resultEvents.isEmpty()) {
            ThreadUtilities.sleep(100);
        }
        return resultEvents.remove(0);
    }

    /*
     * (non-Javadoc)
     *
     * @see
     * org.onap.policy.apex.core.engine.engine.EnEventListener#onEnEvent(org.onap.policy.apex.core.engine.event.EnEvent)
     */
    @Override
    public void onEnEvent(final EnEvent actionEvent) {
        try {
            Thread.sleep(100);
        } catch (final InterruptedException e) {
            e.printStackTrace();
        }
        if (actionEvent != null) {
            System.out.println("Action event from engine:" + actionEvent.getName());
            resultEvents.add(actionEvent);
        }
    }

    /**
     * Gets the id.
     *
     * @return the id
     */
    public String getId() {
        return id;
    }
}