JMeter example source code file (FileToString.java)

This example JMeter source code file (FileToString.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

compoundvariable, compoundvariable, err_ind, invalidvariableexception, io, key, list, min_param_count, non-nls-1, non-nls-1, override, override, param_name, string, string, util

The JMeter FileToString.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.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.LinkedList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.jmeter.engine.util.CompoundVariable;
import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.samplers.Sampler;
import org.apache.jmeter.threads.JMeterVariables;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.logging.LoggingManager;
import org.apache.jorphan.util.JMeterStopThreadException;
import org.apache.log.Logger;

/**
 * FileToString Function to read a complete file into a String.
 *
 * Parameters:
 * - file name
 * - file encoding (optional)
 * - variable name (optional)
 *
 * Returns:
 * - the whole text from a file
 * - or **ERR** if an error occurs
 * - value is also optionally saved in the variable for later re-use.
 *
 */
public class FileToString extends AbstractFunction {
    private static final Logger log = LoggingManager.getLoggerForClass();

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

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

    static final String ERR_IND = "**ERR**";//$NON-NLS-1$

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

    private static final int MIN_PARAM_COUNT = 1;

    private static final int MAX_PARAM_COUNT = 3;

    private static final int ENCODING = 2;

    private static final int PARAM_NAME = 3;

    private Object[] values;

    public FileToString() {
    }

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

        String fileName = ((CompoundVariable) values[0]).execute();

        String encoding = null;//means platform default
        if (values.length >= ENCODING) {
            encoding = ((CompoundVariable) values[ENCODING - 1]).execute().trim();
        }

        String myName = "";//$NON-NLS-1$
        if (values.length >= PARAM_NAME) {
            myName = ((CompoundVariable) values[PARAM_NAME - 1]).execute().trim();
        }

        String myValue = ERR_IND;

        try {
            myValue = FileUtils.readFileToString(new File(fileName), encoding);
        } catch (IOException e) {
            log.warn("Could not read file: "+fileName+" "+e.getMessage());
            throw new JMeterStopThreadException("End of sequence");
        }

        if (myName.length() > 0) {
            JMeterVariables vars = getVariables();
            if (vars != null) {// Can be null if called from Config item testEnded() method
                vars.put(myName, myValue);
            }
        }

        if (log.isDebugEnabled()) {
            String tn = Thread.currentThread().getName();
            log.debug(tn + " name:" //$NON-NLS-1$
                    + myName + " value:" + myValue);//$NON-NLS-1$
        }

        return myValue;
    }


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

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

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