JMeter example source code file (CPSPauser.java)

This example JMeter source code file (CPSPauser.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

characters, cps=cps, cps=cps, cpspauser, cpspauser, illegalargumentexception, interruptedexception, interruptedexception, ms_per_sec, ns_per_ms, ns_per_ms, ns_per_sec, ns_per_sec/ms_per_sec, speed

The JMeter CPSPauser.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.util;

/**
 *
 * Generate appropriate pauses for a given CPS (characters per second)
 */
public class CPSPauser{
    private final int CPS; // Characters per second to emulate

    // Conversions for milli and nano seconds
    private static final int MS_PER_SEC = 1000;
    private static final int NS_PER_SEC = 1000000000;
    private static final int NS_PER_MS  = NS_PER_SEC/MS_PER_SEC;

    /**
     * Create a pauser with the appropriate speed settings.
     *
     * @param cps CPS to emulate
     */
    public CPSPauser(int cps){
        if (cps <=0) {
            throw new IllegalArgumentException("Speed (cps) <= 0");
        }
        CPS=cps;
    }

    /**
     * Pause for an appropriate time according to the number of bytes being transferred.
     *
     * @param bytes number of bytes being transferred
     */
    public void pause(int bytes){
        long sleepMS = (bytes*MS_PER_SEC)/CPS;
        int  sleepNS = ((bytes*MS_PER_SEC)/CPS) % NS_PER_MS;
        try {
            Thread.sleep(sleepMS,sleepNS);
        } catch (InterruptedException ignored) {
        }
    }
}