org.springframework.web.context.request.async.DeferredResult<T>

<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
    http://maven.apache.org/xsd/maven-4.0.0.xsd">


  <modelVersion>4.0.0</modelVersion>
  <groupId>com.java</groupId>
  <artifactId>async</artifactId>
  <version>1.0.0</version>

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.5.RELEASE</version>
  </parent>


  <dependencies>

    <!-- Spring Boot -->
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>


    <!-- 熱部署 -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>springloaded</artifactId>
      <version>1.2.8.RELEASE</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-devtools</artifactId>
      <scope>provided</scope>
    </dependency>

  </dependencies>

  <build>
    <finalName>${project.artifactId}</finalName>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
          <encoding>UTF-8</encoding>
        </configuration>
      </plugin>

      <plugin>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-maven-plugin</artifactId>
        <executions>
          <execution>
            <goals>
              <goal>repackage</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>

package com.java;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class AsyncStarter {

  public static void main(String[] args) {
    SpringApplication.run(AsyncStarter.class, args);
  }
}

package com.java.vo;

import org.springframework.web.context.request.async.DeferredResult;

/**
 * 存儲異步處理信息
 * 
 * @author Logen
 *
 * @param <I> 接口輸入?yún)?shù)
 * @param <O> 接口返回參數(shù)
 */
public class AsyncVo<I, O> {

  /**
   * 請求參數(shù)
   */
  private I params;

  /**
   * 響應(yīng)結(jié)果
   */
  private DeferredResult<O> result;

  public I getParams() {
    return params;
  }

  public void setParams(I params) {
    this.params = params;
  }

  public DeferredResult<O> getResult() {
    return result;
  }

  public void setResult(DeferredResult<O> result) {
    this.result = result;
  }
}

package com.java.queue;

import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;

import org.springframework.stereotype.Component;

import com.java.vo.AsyncVo;

/**
 * 存放所有異步處理接口請求隊列的對象,一個接口對應(yīng)一個隊列
 * 
 * @author Logen
 *
 */
@Component
public class RequestQueue {

  /**
   * 處理下訂單接口的隊列，設(shè)置緩沖容量為50
   */
  private BlockingQueue<AsyncVo<String, Object>> orderQueue = new LinkedBlockingQueue<>(50);

  public BlockingQueue<AsyncVo<String, Object>> getOrderQueue() {
    return orderQueue;
  }
}

package com.java.task;

import java.util.HashMap;
import java.util.Map;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.java.queue.RequestQueue;
import com.java.vo.AsyncVo;

/**
 * 處理訂單接口的任務(wù)，每個任務(wù)類處理一種接口
 * 
 * @author Logen
 *
 */
@Component
public class OrderTask extends Thread {

  @Autowired
  private RequestQueue queue;

  private boolean running = true;

  @Override
  public void run() {
    while (running) {
      try {
        AsyncVo<String, Object> vo = queue.getOrderQueue().take();
        System.out.println("[ OrderTask ]開始處理訂單");

        String params = vo.getParams();
        Thread.sleep(3000);
        Map<String, Object> map = new HashMap<>();
        map.put("params", params);
        map.put("time", System.currentTimeMillis());

        vo.getResult().setResult(map);

        System.out.println("[ OrderTask ]訂單處理完成");
      } catch (InterruptedException e) {
        e.printStackTrace();
        running = false;
      }

    }
  }

  public void setRunning(boolean running) {
    this.running = running;
  }
}

package com.java.listener;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.java.task.OrderTask;

/**
 * 隊列監(jiān)聽器，初始化啟動所有監(jiān)聽任務(wù)
 * 
 * @author Logen
 *
 */
@Component
public class QueueListener {

  @Autowired
  private OrderTask orderTask;

  /**
   * 初始化時啟動監(jiān)聽請求隊列
   */
  @PostConstruct
  public void init() {
    orderTask.start();
  }

  /**
   * 銷毀容器時停止監(jiān)聽任務(wù)
   */
  @PreDestroy
  public void destory() {
    orderTask.setRunning(false);
  }

}

package com.java.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.context.request.async.DeferredResult;

import com.java.queue.RequestQueue;
import com.java.vo.AsyncVo;

/**
 * <blockquote>
 * 
 * <pre>
 * 
 * 模擬下單處理，實現(xiàn)高吞吐量異步處理請求
 * 
 * 1、 Controller層接口只接收請求，不進行處理，而是把請求信息放入到對應(yīng)該接口的請求隊列中
 * 2、 該接口對應(yīng)的任務(wù)類監(jiān)聽對應(yīng)接口的請求隊列，從隊列中順序取出請求信息并進行處理
 * 
 * 優(yōu)點：接口幾乎在收到請求的同時就已經(jīng)返回，處理程序在后臺異步進行處理，大大提高吞吐量
 * 
 * 
 * </pre>
 * 
 * </blockquote>
 * 
 * @author Logen
 *
 */
@RestController
public class OrderController {

  @Autowired
  private RequestQueue queue;

  @GetMapping("/order")
  public DeferredResult<Object> order(String number) throws InterruptedException {
    System.out.println("[ OrderController ] 接到下單請求");
    System.out.println("當前待處理訂單數(shù)： " + queue.getOrderQueue().size());

    AsyncVo<String, Object> vo = new AsyncVo<>();
    DeferredResult<Object> result = new DeferredResult<>();

    vo.setParams(number);
    vo.setResult(result);

    queue.getOrderQueue().put(vo);
    System.out.println("[ OrderController ] 返回下單結(jié)果");
    return result;
  }
}

[ OrderController ] 接到下單請求
當前待處理訂單數(shù)： 0
[ OrderController ] 返回下單結(jié)果
[ OrderTask ]開始處理訂單
[ OrderTask ]訂單處理完成