1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one 3 * or more contributor license agreements. See the NOTICE file 4 * distributed with this work for additional information 5 * regarding copyright ownership. The ASF licenses this file 6 * to you under the Apache License, Version 2.0 (the 7 * "License"); you may not use this file except in compliance 8 * with the License. You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 package org.apache.giraph.utils; 20 21 import org.apache.log4j.Logger; 22 23 /** 24 * Print log messages only if the time is met. Thread-safe. 25 */ 26 public class TimedLogger { 27 /** Last time printed */ 28 private volatile long lastPrint = System.currentTimeMillis(); 29 /** Minimum interval of time to wait before printing */ 30 private final int msecs; 31 /** Logger */ 32 private final Logger log; 33 34 /** 35 * Constructor of the timed logger 36 * 37 * @param msecs Msecs to wait before printing again 38 * @param log Logger to print to 39 */ 40 public TimedLogger(int msecs, Logger log) { 41 this.msecs = msecs; 42 this.log = log; 43 } 44 45 /** 46 * Print to the info log level if the minimum waiting time was reached. 47 * 48 * @param msg Message to print 49 */ 50 public void info(String msg) { 51 if (isPrintable()) { 52 log.info(msg); 53 } 54 } 55 56 /** 57 * Is the log message printable (minimum interval met)? 58 * 59 * @return True if the message is printable 60 */ 61 public boolean isPrintable() { 62 if (System.currentTimeMillis() > lastPrint + msecs) { 63 lastPrint = System.currentTimeMillis(); 64 return true; 65 } 66 67 return false; 68 } 69 }