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history/003b_simple/src/main/java/com/github/drinkjava2/frog/egg/EggTool.java

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+/*
+ * Copyright 2018 the original author or authors. 
+ * Licensed 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 com.github.drinkjava2.frog.egg;
+
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+
+import com.github.drinkjava2.frog.Application;
+import com.github.drinkjava2.frog.Env;
+import com.github.drinkjava2.frog.Frog;
+import com.github.drinkjava2.frog.util.FrogFileUtils;
+
+/**
+ * EggTool save eggs to disk
+ * 
+ * @author Yong Zhu
+ * @since 1.0
+ */
+public class EggTool {
+
+	/**
+	 * Frogs which have higher energy lay eggs
+	 * 
+	 * 利用Java串行机制存盘。 能量多(也就是吃的更多)的Frog下蛋并存盘, 以进行下一轮测试，能量少的Frog被淘汰，没有下蛋的资格。
+	 * 用能量的多少来简化生存竟争模拟，每次下蛋数量固定为EGG_QTY个
+	 */
+	public static void layEggs() {
+		sortFrogsOrderByEnergyDesc();
+
+		Frog first = Env.frogs.get(0);
+		Frog last = Env.frogs.get(Env.frogs.size() - 1);
+
+		try {
+			Env.eggs.clear();
+			for (int i = 0; i < Env.EGG_QTY; i++)
+				Env.eggs.add(new Egg(Env.frogs.get(i)));
+			FileOutputStream fo = new FileOutputStream(Application.CLASSPATH + "eggs.ser");
+			ObjectOutputStream so = new ObjectOutputStream(fo);
+			so.writeObject(Env.eggs);
+			so.close();
+			System.out.print("\r1st frog has " + first.organs.size() + " organs, energy=" + first.energy );
+			System.out.println(", Last frog has " + last.organs.size() + " organs,  energy=" + last.energy);
+			System.out.println("Saved " + Env.eggs.size() + " eggs to file '" + Application.CLASSPATH + "eggs.ser'");
+		} catch (IOException e) {
+			System.out.println(e);
+		}
+	}
+
+	private static void sortFrogsOrderByEnergyDesc() {// 按能量多少给青蛙排序
+		Collections.sort(Env.frogs, new Comparator<Frog>() {
+			public int compare(Frog a, Frog b) {
+				if (a.energy > b.energy)
+					return -1;
+				else if (a.energy == b.energy)
+					return 0;
+				else
+					return 1;
+			}
+		});
+	}
+
+	public static void deleteEggs() {
+		System.out.println("Delete exist egg file: '" + Application.CLASSPATH + "eggs.ser'");
+		FrogFileUtils.deleteFile(Application.CLASSPATH + "eggs.ser");
+	}
+
+	/**
+	 * 从磁盘读入一批Egg
+	 */
+	@SuppressWarnings("unchecked")
+	public static void loadEggs() {
+		boolean errorfound = false;
+		try {
+			FileInputStream eggsFile = new FileInputStream(Application.CLASSPATH + "eggs.ser");
+			ObjectInputStream eggsInputStream = new ObjectInputStream(eggsFile);
+			Env.eggs = (List<Egg>) eggsInputStream.readObject();
+			System.out.println(
+					"Loaded " + Env.eggs.size() + " eggs from file '" + Application.CLASSPATH + "eggs.ser" + "'.\n");
+			eggsInputStream.close();
+		} catch (Exception e) {
+			errorfound = true;
+		}
+		if (errorfound) {
+			Env.eggs.clear();
+			for (int j = 0; j < Env.EGG_QTY; j++)
+				Env.eggs.add(new Egg());
+			System.out.println("Fail to load egg file at path '" + Application.CLASSPATH + "', created "
+					+ Env.eggs.size() + " eggs to do test.\n");
+		}
+
+	}
+
+}