#554: Subclass Sandbox pattern (#998)

* Fix issue #761: ThreadSafeDoubleCheckLocking.java: Instantiating by Reflection call will be successful if you do that firstly * Create leader election module * Create Interface of Instance and MessageManager * Create implementations with token ring algorithm * Change package structure. Create basic message system. * Implement heartbeat and heartbeat invoking message system * Implement election message handler * Add leader message handler * Add main entry point * Add comments * Update README.md * Fix checkstyle issue * Add Unit Tests * Add Unit Tests * Add bully leader selection * Change System.out to log print. Add MIT license in each file. * Add More java doc comments * Add unit test * Add unit tests * Add subclass-sandbox * Add Unit Test * Add Unit Test * Fix Typo * Move dependency into parent pom.xml * Change local valuable reference to be var
2026-05-17 04:59:21 +00:00 · 2019-10-16 23:21:06 +08:00
parent 27c131c2cb
commit a5646b63c1
10 changed files with 517 additions and 1 deletions
@@ -0,0 +1,53 @@
+/**
+ * The MIT License
+ * Copyright (c) 2014-2016 Ilkka Seppälä
+ * <p>
+ * 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:
+ * <p>
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * <p>
+ * 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.subclasssandbox;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * The subclass sandbox pattern describes a basic idea, while not having a lot
+ * of detailed mechanics. You will need the pattern when you have several similar
+ * subclasses. If you have to make a tiny change, then change the base class,
+ * while all subclasses shouldn't have to be touched. So the base class has to be
+ * able to provide all of the operations a derived class needs to perform.
+ */
+public class App {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
+
+  /**
+   * Entry point of the main program.
+   * @param args Program runtime arguments.
+   */
+  public static void main(String[] args) {
+    LOGGER.info("Use superpower: sky launch");
+    var skyLaunch = new SkyLaunch();
+    skyLaunch.activate();
+    LOGGER.info("Use superpower: ground dive");
+    var groundDive = new GroundDive();
+    groundDive.activate();
+  }
+
+}