update at 2021-02-20 18:02:28 by ehlxr

src/main/java/io/github/ehlxr/queue/Order.java

@@ -0,0 +1,90 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright © 2020 xrv <xrg@live.com>
+ *
+ * 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 io.github.ehlxr.queue;
+
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.util.concurrent.DelayQueue;
+import java.util.concurrent.Delayed;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * 订单延迟队列
+ *
+ * @author ehlxr
+ * @since 2021-02-20 16:28.
+ */
+public class Order implements Delayed {
+    /**
+     * 延迟时间
+     */
+    private long time;
+    String name;
+
+    public Order(String name, long time, TimeUnit unit) {
+        this.name = name;
+        this.time = System.currentTimeMillis() + (time > 0 ? unit.toMillis(time) : 0);
+    }
+
+    @Override
+    public long getDelay(TimeUnit unit) {
+        return time - System.currentTimeMillis();
+    }
+
+    @Override
+    public int compareTo(Delayed delayed) {
+        Order order = (Order) delayed;
+        long diff = this.time - order.time;
+        if (diff <= 0) {
+            return -1;
+        } else {
+            return 1;
+        }
+    }
+
+
+    public static void main(String[] args) throws InterruptedException {
+        Order order1 = new Order("Order1", 5, TimeUnit.SECONDS);
+        Order order2 = new Order("Order2", 10, TimeUnit.SECONDS);
+        Order order3 = new Order("Order3", 15, TimeUnit.SECONDS);
+        DelayQueue<Order> delayQueue = new DelayQueue<>();
+        delayQueue.put(order1);
+        delayQueue.put(order3);
+        delayQueue.put(order2);
+
+        System.out.println("订单延迟队列开始时间:" + LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
+        while (delayQueue.size() != 0) {
+            /*
+             * 取队列头部元素是否过期
+             */
+            Order task = delayQueue.take(); // 阻塞
+            // Order task = delayQueue.poll(); // 非阻塞
+            // if (task != null) {
+            System.out.format("订单:{%s}被取消, 取消时间:{%s}\n", task.name, LocalDateTime.now().format(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
+            // }
+            // TimeUnit.SECONDS.sleep(1);
+        }
+    }
+}

src/main/java/io/github/ehlxr/test/Test.java

@@ -24,23 +24,27 @@
 
 package io.github.ehlxr.test;
 
+import java.util.Arrays;
 import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.StringJoiner;
+import java.util.stream.Collectors;
 
 /**
  * Created by ehlxr on 2016/12/15.
  */
 public class Test {
     public static void main(String[] args) {
-        String s0 = "kvill";
-        String s1 = "kvill";
-        String s2 = "kvill";
-        System.out.println(s0 == s1);
-        System.out.println("**********");
-        s1.intern();
-        s2 = s2.intern(); //把常量池中"kvill"的引用赋给s2
-        System.out.println(s0 == s1);
-        System.out.println(s0 == s1.intern());
-        System.out.println(s0 == s2);
+        // String s0 = "kvill";
+        // String s1 = "kvill";
+        // String s2 = "kvill";
+        // System.out.println(s0 == s1);
+        // System.out.println("**********");
+        // s1.intern();
+        // s2 = s2.intern(); //把常量池中"kvill"的引用赋给s2
+        // System.out.println(s0 == s1);
+        // System.out.println(s0 == s1.intern());
+        // System.out.println(s0 == s2);
 
 
         // LinkedHashMap
@@ -54,5 +58,31 @@ public class Test {
         map.put("a", "555");
 
         System.out.println(map);
+
+
+        // The String "[George:Sally:Fred]" may be constructed as follows:
+
+        StringJoiner sj = new StringJoiner(":", "[", "]");
+        sj.add("George").add("Sally").add("Fred");
+        System.out.println(sj);
+        // A StringJoiner may be employed to create formatted output from a java.util.stream.Stream using java.util.stream.Collectors.joining(CharSequence). For example:
+
+        List<Integer> numbers = Arrays.asList(1, 2, 3, 4);
+        String commaSeparatedNumbers = numbers.stream()
+                .map(Object::toString)
+                .collect(Collectors.joining(", "));
+        System.out.println(commaSeparatedNumbers);
+
+
+        System.out.println("------------" + (-1 >>> Integer.numberOfLeadingZeros(3)));
+
+        String s = new String("1");
+        String t = new String("1");
+        String s1 = s.intern();
+        String s2 = "1";
+        System.out.println(s == s1);
+        System.out.println(s1 == s2);
+        System.out.println(s == t);   // false
+        System.out.println(s.intern() == t.intern());   // true
     }
 }