Game Loop Pattern (#1083)

* Add game loop module * Add game loop module * Fix merge issue * Implement game loop module * Implement game loop module * Implement time based game loop * implement VariableStepGameLoop * Implement FixedStepGameLoop * Add UT * Add Unit tests * Fix checkstyle issues * Add README.md * Fix code review issues * Fix code review issues * update README.md
2026-05-14 16:58:47 +00:00 · 2019-11-16 20:40:23 +08:00
parent df8a4e3b47
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+/*
+ * The MIT License
+ * Copyright © 2014-2019 Ilkka Seppälä
+ *
+ * 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.gameloop;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * A game loop runs continuously during gameplay. Each turn of the loop, it processes
+ * user input without blocking, updates the game state, and renders the game. It tracks
+ * the passage of time to control the rate of gameplay.
+ */
+public class App {
+
+  private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
+
+  /**
+   * Each type of game loop will run for 2 seconds.
+   */
+  private static final int GAME_LOOP_DURATION_TIME = 2000;
+
+  /**
+   * Program entry point.
+   * @param args runtime arguments
+   */
+  public static void main(String[] args) {
+
+    try {
+      LOGGER.info("Start frame-based game loop:");
+      var frameBasedGameLoop = new FrameBasedGameLoop();
+      frameBasedGameLoop.run();
+      Thread.sleep(GAME_LOOP_DURATION_TIME);
+      frameBasedGameLoop.stop();
+      LOGGER.info("Stop frame-based game loop.");
+
+      LOGGER.info("Start variable-step game loop:");
+      var variableStepGameLoop = new VariableStepGameLoop();
+      variableStepGameLoop.run();
+      Thread.sleep(GAME_LOOP_DURATION_TIME);
+      variableStepGameLoop.stop();
+      LOGGER.info("Stop variable-step game loop.");
+
+      LOGGER.info("Start fixed-step game loop:");
+      var fixedStepGameLoop = new FixedStepGameLoop();
+      fixedStepGameLoop.run();
+      Thread.sleep(GAME_LOOP_DURATION_TIME);
+      fixedStepGameLoop.stop();
+      LOGGER.info("Stop variable-step game loop.");
+
+    } catch (InterruptedException e) {
+      LOGGER.error(e.getMessage());
+    }
+  }
+
+}