ScriptExecutionThread.java

/**
 * Copyright (c) 2014-2017 by the respective copyright holders.
 * 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
 */
package org.eclipse.smarthome.model.script.engine;

import org.eclipse.xtext.xbase.interpreter.IEvaluationContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * This class can be used to execute scripts in a separate thread, so that the execution
 * of the caller thread is not blocked.
 *
 * @author Kai Kreuzer - Initial contribution and API
 *
 */
@SuppressWarnings("restriction")
public class ScriptExecutionThread extends Thread {

    private final Logger logger = LoggerFactory.getLogger(ScriptExecutionThread.class);

    private Script script;
    private IEvaluationContext context;

    // the script evaluation result
    private Object result = null;

    public ScriptExecutionThread(String name, Script script, IEvaluationContext context) {
        setName(name);
        this.script = script;
        this.context = context;
    }

    @Override
    public void run() {
        super.run();
        try {
            result = script.execute(context);
        } catch (Exception e) {
            String msg = e.getMessage();
            if (msg == null) {
                logger.error("Rule '{}'", getName(), e.getCause());
            } else {
                logger.error("Rule '{}': {}", getName(), msg);
            }
        }
    }

    /**
     * Returns the script evaluation result (or null, if thread is still active)
     *
     * @return the script evaluation result
     */
    public Object getResult() {
        return result;
    }
}