| /* |
| * 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 { |
| if(sleepMS>0 || sleepNS>0) { |
| Thread.sleep(sleepMS,sleepNS); |
| } |
| } catch (InterruptedException ignored) { |
| } |
| } |
| } |