Delete AppUgly.java

tls/src/main/java/com/iluwatar/tls/AppUgly.java

@@ -1,112 +0,0 @@
-/**
- * The MIT License
- * Copyright (c) 2016 Thomas Bauer
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
- * THE SOFTWARE.
- */
-
-package com.iluwatar.tls;
-
-import java.util.ArrayList;
-import java.util.Calendar;
-import java.util.Collections;
-import java.util.Date;
-import java.util.List;
-
-/**
- * 
- * This App shows an example for problems with global thread variables. A global
- * thread variable is a variable defined as class variable of a
- * XyzRunnable-Class. In this example in the class
- * {@link DateFormatUglyRunnable}
- * <p>
- * Example use case: A well known problem with threads are non thread-safe Java
- * classes. One example is the class SimpleDateFormat.
- * <p>
- * In the example an instance of SimpleDateFormat is created in the constructor
- * of the Runnable. The constructor initializes a class variable with the
- * instance. The Runnable only does convert a string date to a date format using
- * the instance of SimpleDateFormat. It does this 5 times.
- * <p>
- * In the example 4 threads are started to do the same. If you are lucky
- * everything works well. But if you try more often you will happen to see
- * Exceptions. And these Exceptions arise on arbitrary points of the run.
- * <p>
- * The reason for this exceptions is: The threads try to use internal instance
- * variables of the SimpleDateFormat instance at the same time (the date is
- * stored internal as member variable during parsing and may be overwritten by
- * another thread during a parse is still running)
- * <p>
- * And even without Exceptions the run may not deliver the correct results. 
- * All date values should be the same after the run. Check it
- * 
- */
-public class AppUgly {
-  // A list to collect the date values created in the the threads
-  static List<Date> dateList = Collections.synchronizedList(new ArrayList<Date>());
-  // A list to collect Exceptions thrown in the threads
-  static List<String> exceptionList = Collections.synchronizedList(new ArrayList<String>());
-
-  /**
-   * Program entry point
-   * 
-   * @param args
-   *          command line args
-   */
-  public static void main(String[] args) {
-    int counterDateValues = 0;
-    int counterExceptions = 0;
-
-    // Prepare the Runnable
-    DateFormatUglyRunnable runnableDf = new DateFormatUglyRunnable("dd/MM/yyyy", "15/12/2015");
-
-    // 4 threads using the same Runnable
-    Thread t1 = new Thread(runnableDf);
-    Thread t2 = new Thread(runnableDf);
-    Thread t3 = new Thread(runnableDf);
-    Thread t4 = new Thread(runnableDf);
-    t1.start();
-    t2.start();
-    t3.start();
-    t4.start();
-    try {
-      t1.join();
-      t2.join();
-      t3.join();
-      t4.join();
-    } catch (InterruptedException e) {
-      // Action not coded here
-    }
-    for (Date dt : dateList) {
-      // a correct run should deliver 20 times 15.12.2015
-      counterDateValues++;
-      Calendar cal = Calendar.getInstance();
-      cal.setTime(dt);
-      // Formatted output of the date value: DD.MM.YYYY
-      System.out.println(cal.get(Calendar.DAY_OF_MONTH) + "." + cal.get(Calendar.MONTH) + "." + cal.get(Calendar.YEAR));
-    }
-    for (String ex : exceptionList) {
-      // a correct run shouldn't deliver any exception
-      counterExceptions++;
-      System.out.println(ex);
-    }
-    System.out.println("The List dateList contains " + counterDateValues + " date values");
-    System.out.println("The List exceptionList contains " + counterExceptions + " exceptions");
-  }
-}