| /* |
| * 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 examples; |
| |
| import org.apache.log4j.PropertyConfigurator; |
| import org.apache.log4j.Logger; |
| |
| /** |
| Example code for log4j to viewed in conjunction with the {@link |
| examples.SortAlgo SortAlgo} class. |
| |
| <p>This program expects a configuration file name as its first |
| argument, and the size of the array to sort as the second and last |
| argument. See its <b><a href="doc-files/Sort.java">source |
| code</a></b> for more details. |
| |
| <p>Play around with different values in the configuration file and |
| watch the changing behavior. |
| |
| <p>Example configuration files can be found in <a |
| href="doc-files/sort1.properties">sort1.properties</a>, <a |
| href="doc-files/sort2.properties">sort2.properties</a>, <a |
| href="doc-files/sort3.properties">sort3.properties</a> and <a |
| href="doc-files/sort4.properties">sort4.properties</a> are supplied with the |
| package. |
| |
| <p>If you are also interested in logging performance, then have |
| look at the {@link org.apache.log4j.performance.Logging} class. |
| |
| @author Ceki Gülcü */ |
| |
| public class Sort { |
| |
| static Logger logger = Logger.getLogger(Sort.class.getName()); |
| |
| public static void main(String[] args) { |
| if(args.length != 2) { |
| usage("Incorrect number of parameters."); |
| } |
| int arraySize = -1; |
| try { |
| arraySize = Integer.valueOf(args[1]).intValue(); |
| if(arraySize <= 0) |
| usage("Negative array size."); |
| } |
| catch(java.lang.NumberFormatException e) { |
| usage("Could not number format ["+args[1]+"]."); |
| } |
| |
| PropertyConfigurator.configure(args[0]); |
| |
| int[] intArray = new int[arraySize]; |
| |
| logger.info("Populating an array of " + arraySize + " elements in" + |
| " reverse order."); |
| for(int i = arraySize -1 ; i >= 0; i--) { |
| intArray[i] = arraySize - i - 1; |
| } |
| |
| SortAlgo sa1 = new SortAlgo(intArray); |
| sa1.bubbleSort(); |
| sa1.dump(); |
| |
| // We intentionally initilize sa2 with null. |
| SortAlgo sa2 = new SortAlgo(null); |
| logger.info("The next log statement should be an error message."); |
| sa2.dump(); |
| logger.info("Exiting main method."); |
| } |
| |
| static |
| void usage(String errMsg) { |
| System.err.println(errMsg); |
| System.err.println("\nUsage: java org.apache.examples.Sort " + |
| "configFile ARRAY_SIZE\n"+ |
| "where configFile is a configuration file\n"+ |
| " ARRAY_SIZE is a positive integer.\n"); |
| System.exit(1); |
| } |
| } |