From 55d8f3b68f8ed425bf085aa955055402521f4fae Mon Sep 17 00:00:00 2001 From: ehlxr Date: Sat, 20 Feb 2021 18:02:28 +0800 Subject: [PATCH] update at 2021-02-20 18:02:28 by ehlxr --- .../java/io/github/ehlxr/queue/Order.java | 90 +++++++++++++++++++ src/main/java/io/github/ehlxr/test/Test.java | 50 ++++++++--- 2 files changed, 130 insertions(+), 10 deletions(-) create mode 100644 src/main/java/io/github/ehlxr/queue/Order.java diff --git a/src/main/java/io/github/ehlxr/queue/Order.java b/src/main/java/io/github/ehlxr/queue/Order.java new file mode 100644 index 0000000..0a82e23 --- /dev/null +++ b/src/main/java/io/github/ehlxr/queue/Order.java @@ -0,0 +1,90 @@ +/* + * The MIT License (MIT) + * + * Copyright © 2020 xrv + * + * 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 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); + } + } +} \ No newline at end of file diff --git a/src/main/java/io/github/ehlxr/test/Test.java b/src/main/java/io/github/ehlxr/test/Test.java index f117d7a..5333b9c 100644 --- a/src/main/java/io/github/ehlxr/test/Test.java +++ b/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 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 } }