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JMeter example source code file (

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

Java - JMeter tags/keywords

hashmap, io, map, map, non-nls-1, non-nls-1, opening, parser, sax, string, string, there's, threadlocal, transformerexception, util, xml, xpathfilecontainer, xpathfilecontainer, xpathwrapper

The JMeter 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
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.jmeter.functions;

import java.util.HashMap;
import java.util.Map;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.TransformerException;

import org.apache.jorphan.logging.LoggingManager;
import org.apache.log.Logger;
import org.xml.sax.SAXException;

 * This class wraps the XPathFileContainer for use across multiple threads.
 * It maintains a list of nodelist containers, one for each file/xpath combination
public class XPathWrapper {

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

     * This Map serves two purposes:
     * - maps names to  containers
     * - ensures only one container per file across all threads
     * The key is the concatenation of the file name and the XPath string
    private static final Map<String, XPathFileContainer> fileContainers =
        new HashMap<String, XPathFileContainer>();

    /* The cache of file packs - for faster local access */
    private static final ThreadLocal<Map filePacks =
        new ThreadLocal<Map() {
        protected Map<String, XPathFileContainer> initialValue() {
            return new HashMap<String, XPathFileContainer>();

    private XPathWrapper() {// Prevent separate instantiation

    private static XPathFileContainer open(String file, String xpathString) {
        String tname = Thread.currentThread().getName();": Opening " + file);
        XPathFileContainer frcc=null;
        try {
            frcc = new XPathFileContainer(file, xpathString);
        } catch (FileNotFoundException e) {
        } catch (IOException e) {
        } catch (ParserConfigurationException e) {
        } catch (SAXException e) {
        } catch (TransformerException e) {
        return frcc;

     * Not thread-safe - must be called from a synchronized method.
     * @param file
     * @param xpathString
     * @return the next row from the file container
    public static String getXPathString(String file, String xpathString) {
        Map<String, XPathFileContainer> my = filePacks.get();
        String key = file+xpathString;
        XPathFileContainer xpfc = my.get(key);
        if (xpfc == null) // We don't have a local copy
                xpfc = fileContainers.get(key);
                if (xpfc == null) { // There's no global copy either
                    xpfc=open(file, xpathString);
                if (xpfc != null) {
                    fileContainers.put(key, xpfc);// save the global copy
            // TODO improve the error handling
            if (xpfc == null) {
                log.error("XPathFileContainer is null!");
                return ""; //$NON-NLS-1$
            my.put(key,xpfc); // save our local copy
        if (xpfc.size()==0){
            log.warn("XPathFileContainer has no nodes: "+file+" "+xpathString);
            return ""; //$NON-NLS-1$
        int currentRow = xpfc.nextRow();
        log.debug("getting match number " + currentRow);
        return xpfc.getXPathString(currentRow);

    public static void clearAll() {
        String tname = Thread.currentThread().getName();": clearing container");
        synchronized (fileContainers) {

Other JMeter examples (source code examples)

Here is a short list of links related to this JMeter source code file:

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