JMeter example source code file (JavaScript.java)

This example JMeter source code file (JavaScript.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - JMeter tags/keywords

abstractfunction, compoundvariable, invalidvariableexception, invalidvariableexception, javascript, javascript, key, list, non-nls-1, non-nls-1, object, override, string, string, util

The JMeter JavaScript.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 *
 */

package org.apache.jmeter.functions;

import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import org.apache.jmeter.engine.util.CompoundVariable;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.samplers.Sampler;
import org.apache.jmeter.threads.JMeterContext;
import org.apache.jmeter.threads.JMeterContextService;
import org.apache.jmeter.threads.JMeterVariables;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.RhinoException;
import org.mozilla.javascript.Scriptable;

public class JavaScript extends AbstractFunction {

    private static final List<String> desc = new LinkedList();

    private static final String KEY = "__javaScript"; //$NON-NLS-1$

    private static final Logger log = LoggingManager.getLoggerForClass();

    static {
        desc.add(JMeterUtils.getResString("javascript_expression"));//$NON-NLS-1$
        desc.add(JMeterUtils.getResString("function_name_paropt")); //$NON-NLS-1$
    }

    private Object[] values;

    public JavaScript() {
    }

    /** {@inheritDoc} */
    @Override
    public synchronized String execute(SampleResult previousResult, Sampler currentSampler)
            throws InvalidVariableException {

        JMeterContext jmctx = JMeterContextService.getContext();
        JMeterVariables vars = jmctx.getVariables();

        String script = ((CompoundVariable) values[0]).execute();
        // Allow variable to be omitted
        String varName = values.length < 2 ? null : ((CompoundVariable) values[1]).execute().trim();
        String resultStr = "";

        Context cx = Context.enter();
        try {

            Scriptable scope = cx.initStandardObjects(null);

            // Set up some objects for the script to play with
            scope.put("log", scope, log); //$NON-NLS-1$
            scope.put("ctx", scope, jmctx); //$NON-NLS-1$
            scope.put("vars", scope, vars); //$NON-NLS-1$
            scope.put("props", scope, JMeterUtils.getJMeterProperties()); //$NON-NLS-1$
            // Previously mis-spelt as theadName
            scope.put("threadName", scope, Thread.currentThread().getName()); //$NON-NLS-1$
            scope.put("sampler", scope, currentSampler); //$NON-NLS-1$
            scope.put("sampleResult", scope, previousResult); //$NON-NLS-1$

            Object result = cx.evaluateString(scope, script, "<cmd>", 1, null); //$NON-NLS-1$

            resultStr = Context.toString(result);
            if (varName != null && vars != null) {// vars can be null if run from TestPlan
                vars.put(varName, resultStr);
            }

        } catch (RhinoException e) {
            log.error("Error processing Javascript", e);
            throw new InvalidVariableException();
        } finally {
            Context.exit();
        }

        return resultStr;

    }

    /** {@inheritDoc} */
    @Override
    public synchronized void setParameters(Collection<CompoundVariable> parameters) throws InvalidVariableException {
        checkParameterCount(parameters, 1, 2);
        values = parameters.toArray();
    }

    /** {@inheritDoc} */
    @Override
    public String getReferenceKey() {
        return KEY;
    }

    /** {@inheritDoc} */
    public List<String> getArgumentDesc() {
        return desc;
    }

}