基于Springboot吞吐量?jī)?yōu)化解決方案

更新時(shí)間：2020年09月26日 10:48:02 作者：灬點(diǎn)點(diǎn)

這篇文章主要介紹了基于Springboot吞吐量?jī)?yōu)化解決方案，具有很好的參考價(jià)值，希望對(duì)大家有所幫助。一起跟隨小編過(guò)來(lái)看看吧

一、異步執(zhí)行

實(shí)現(xiàn)方式二種：

1.使用異步注解@aysnc、啟動(dòng)類：添加@EnableAsync注解

2.JDK 8本身有一個(gè)非常好用的Future類——CompletableFuture

@AllArgsConstructor
public class AskThread implements Runnable{
 private CompletableFuture<Integer> re = null;

 public void run() {
 int myRe = 0;
 try {
  myRe = re.get() * re.get();
 } catch (Exception e) {
  e.printStackTrace();
 }
 System.out.println(myRe);
 }

 public static void main(String[] args) throws InterruptedException {
 final CompletableFuture<Integer> future = new CompletableFuture<>();
 new Thread(new AskThread(future)).start();
 //模擬長(zhǎng)時(shí)間的計(jì)算過(guò)程
 Thread.sleep(1000);
 //告知完成結(jié)果
 future.complete(60);
 }
}

在該示例中，啟動(dòng)一個(gè)線程，此時(shí)AskThread對(duì)象還沒(méi)有拿到它需要的數(shù)據(jù)，執(zhí)行到 myRe = re.get() * re.get()會(huì)阻塞。我們用休眠1秒來(lái)模擬一個(gè)長(zhǎng)時(shí)間的計(jì)算過(guò)程，并將計(jì)算結(jié)果告訴future執(zhí)行結(jié)果，AskThread線程將會(huì)繼續(xù)執(zhí)行。

public class Calc {
 public static Integer calc(Integer para) {
 try {
  //模擬一個(gè)長(zhǎng)時(shí)間的執(zhí)行
  Thread.sleep(1000);
 } catch (InterruptedException e) {
  e.printStackTrace();
 }
 return para * para;
 }

 public static void main(String[] args) throws ExecutionException, InterruptedException {
 final CompletableFuture<Void> future = CompletableFuture.supplyAsync(() -> calc(50))
  .thenApply((i) -> Integer.toString(i))
  .thenApply((str) -> "\"" + str + "\"")
  .thenAccept(System.out::println);
 future.get();
 }
}

CompletableFuture.supplyAsync方法構(gòu)造一個(gè)CompletableFuture實(shí)例，在supplyAsync()方法中，它會(huì)在一個(gè)新線程中，執(zhí)行傳入的參數(shù)。在這里它會(huì)執(zhí)行calc()方法，這個(gè)方法可能是比較慢的，但這并不影響CompletableFuture實(shí)例的構(gòu)造速度，supplyAsync()會(huì)立即返回。

而返回的CompletableFuture實(shí)例就可以作為這次調(diào)用的契約，在將來(lái)任何場(chǎng)合，用于獲得最終的計(jì)算結(jié)果。supplyAsync用于提供返回值的情況，CompletableFuture還有一個(gè)不需要返回值的異步調(diào)用方法runAsync(Runnable runnable),一般我們?cè)趦?yōu)化Controller時(shí)，使用這個(gè)方法比較多。

這兩個(gè)方法如果在不指定線程池的情況下，都是在ForkJoinPool.common線程池中執(zhí)行，而這個(gè)線程池中的所有線程都是Daemon（守護(hù)）線程，所以，當(dāng)主線程結(jié)束時(shí)，這些線程無(wú)論執(zhí)行完畢都會(huì)退出系統(tǒng)。

核心代碼：

CompletableFuture.runAsync(() ->
 this.afterBetProcessor(betRequest,betDetailResult,appUser,id)
);

異步調(diào)用使用Callable來(lái)實(shí)現(xiàn)

@RestController 
public class HelloController { 
 
 private static final Logger logger = LoggerFactory.getLogger(HelloController.class); 
 
 @Autowired 
 private HelloService hello; 
 
 @GetMapping("/helloworld") 
 public String helloWorldController() { 
 return hello.sayHello(); 
 } 
 
 /** 
 * 異步調(diào)用restful 
 * 當(dāng)controller返回值是Callable的時(shí)候，springmvc就會(huì)啟動(dòng)一個(gè)線程將Callable交給TaskExecutor去處理 
 * 然后DispatcherServlet還有所有的spring攔截器都退出主線程，然后把response保持打開的狀態(tài) 
 * 當(dāng)Callable執(zhí)行結(jié)束之后，springmvc就會(huì)重新啟動(dòng)分配一個(gè)request請(qǐng)求，然后DispatcherServlet就重新 
 * 調(diào)用和處理Callable異步執(zhí)行的返回結(jié)果， 然后返回視圖 
 * 
 * @return 
 */ 
 @GetMapping("/hello") 
 public Callable<String> helloController() { 
 logger.info(Thread.currentThread().getName() + " 進(jìn)入helloController方法"); 
 Callable<String> callable = new Callable<String>() { 
 
  @Override 
  public String call() throws Exception { 
  logger.info(Thread.currentThread().getName() + " 進(jìn)入call方法"); 
  String say = hello.sayHello(); 
  logger.info(Thread.currentThread().getName() + " 從helloService方法返回"); 
  return say; 
  } 
 }; 
 logger.info(Thread.currentThread().getName() + " 從helloController方法返回"); 
 return callable; 
 } 
}

異步調(diào)用的方式 WebAsyncTask

@RestController 
public class HelloController { 
 
 private static final Logger logger = LoggerFactory.getLogger(HelloController.class); 
 
 @Autowired 
 private HelloService hello; 
 
 /** 
 * 帶超時(shí)時(shí)間的異步請(qǐng)求 通過(guò)WebAsyncTask自定義客戶端超時(shí)間 
 * 
 * @return 
 */ 
 @GetMapping("/world") 
 public WebAsyncTask<String> worldController() { 
 logger.info(Thread.currentThread().getName() + " 進(jìn)入helloController方法"); 
 
 // 3s鐘沒(méi)返回，則認(rèn)為超時(shí) 
 WebAsyncTask<String> webAsyncTask = new WebAsyncTask<>(3000, new Callable<String>() { 
 
  @Override 
  public String call() throws Exception { 
  logger.info(Thread.currentThread().getName() + " 進(jìn)入call方法"); 
  String say = hello.sayHello(); 
  logger.info(Thread.currentThread().getName() + " 從helloService方法返回"); 
  return say; 
  } 
 }); 
 logger.info(Thread.currentThread().getName() + " 從helloController方法返回"); 
 
 webAsyncTask.onCompletion(new Runnable() { 
 
  @Override 
  public void run() { 
  logger.info(Thread.currentThread().getName() + " 執(zhí)行完畢"); 
  } 
 }); 
 
 webAsyncTask.onTimeout(new Callable<String>() { 
 
  @Override 
  public String call() throws Exception { 
  logger.info(Thread.currentThread().getName() + " onTimeout"); 
  // 超時(shí)的時(shí)候，直接拋異常，讓外層統(tǒng)一處理超時(shí)異常 
  throw new TimeoutException("調(diào)用超時(shí)"); 
  } 
 }); 
 return webAsyncTask; 
 } 
 
 /** 
 * 異步調(diào)用，異常處理，詳細(xì)的處理流程見MyExceptionHandler類 
 * 
 * @return 
 */ 
 @GetMapping("/exception") 
 public WebAsyncTask<String> exceptionController() { 
 logger.info(Thread.currentThread().getName() + " 進(jìn)入helloController方法"); 
 Callable<String> callable = new Callable<String>() { 
 
  @Override 
  public String call() throws Exception { 
  logger.info(Thread.currentThread().getName() + " 進(jìn)入call方法"); 
  throw new TimeoutException("調(diào)用超時(shí)!"); 
  } 
 }; 
 logger.info(Thread.currentThread().getName() + " 從helloController方法返回"); 
 return new WebAsyncTask<>(20000, callable); 
 } 
}

二、增加內(nèi)嵌Tomcat的最大連接數(shù)

@Configuration
public class TomcatConfig {
 @Bean
 public ConfigurableServletWebServerFactory webServerFactory() {
 TomcatServletWebServerFactory tomcatFactory = new TomcatServletWebServerFactory();
 tomcatFactory.addConnectorCustomizers(new MyTomcatConnectorCustomizer());
 tomcatFactory.setPort(8005);
 tomcatFactory.setContextPath("/api-g");
 return tomcatFactory;
 }
 class MyTomcatConnectorCustomizer implements TomcatConnectorCustomizer {
 public void customize(Connector connector) {
  Http11NioProtocol protocol = (Http11NioProtocol) connector.getProtocolHandler();
  //設(shè)置最大連接數(shù)  
  protocol.setMaxConnections(20000);
  //設(shè)置最大線程數(shù)  
  protocol.setMaxThreads(2000);
  protocol.setConnectionTimeout(30000);
 }
 }
}

三、使用@ComponentScan()定位掃包比@SpringBootApplication掃包更快

四、默認(rèn)tomcat容器改為Undertow（Jboss下的服務(wù)器，Tomcat吞吐量5000，Undertow吞吐量8000）

<exclusions>
 <exclusion>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-tomcat</artifactId>
 </exclusion>
</exclusions>

改為:

<dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-undertow</artifactId>
</dependency>

五、使用 BufferedWriter 進(jìn)行緩沖

六、Deferred方式實(shí)現(xiàn)異步調(diào)用

@RestController
public class AsyncDeferredController {
 private final Logger logger = LoggerFactory.getLogger(this.getClass());
 private final LongTimeTask taskService;
 
 @Autowired
 public AsyncDeferredController(LongTimeTask taskService) {
 this.taskService = taskService;
 }
 
 @GetMapping("/deferred")
 public DeferredResult<String> executeSlowTask() {
 logger.info(Thread.currentThread().getName() + "進(jìn)入executeSlowTask方法");
 DeferredResult<String> deferredResult = new DeferredResult<>();
 // 調(diào)用長(zhǎng)時(shí)間執(zhí)行任務(wù)
 taskService.execute(deferredResult);
 // 當(dāng)長(zhǎng)時(shí)間任務(wù)中使用deferred.setResult("world");這個(gè)方法時(shí)，會(huì)從長(zhǎng)時(shí)間任務(wù)中返回，繼續(xù)controller里面的流程
 logger.info(Thread.currentThread().getName() + "從executeSlowTask方法返回");
 // 超時(shí)的回調(diào)方法
 deferredResult.onTimeout(new Runnable(){
 
 @Override
 public void run() {
 logger.info(Thread.currentThread().getName() + " onTimeout");
 // 返回超時(shí)信息
 deferredResult.setErrorResult("time out!");
 }
 });
 
 // 處理完成的回調(diào)方法，無(wú)論是超時(shí)還是處理成功，都會(huì)進(jìn)入這個(gè)回調(diào)方法
 deferredResult.onCompletion(new Runnable(){
 
 @Override
 public void run() {
 logger.info(Thread.currentThread().getName() + " onCompletion");
 }
 });
 
 return deferredResult;
 }
}

七、異步調(diào)用可以使用AsyncHandlerInterceptor進(jìn)行攔截

@Component
public class MyAsyncHandlerInterceptor implements AsyncHandlerInterceptor {
 
 private static final Logger logger = LoggerFactory.getLogger(MyAsyncHandlerInterceptor.class);
 
 @Override
 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
 throws Exception {
 return true;
 }
 
 @Override
 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
 ModelAndView modelAndView) throws Exception {
// HandlerMethod handlerMethod = (HandlerMethod) handler;
 logger.info(Thread.currentThread().getName()+ "服務(wù)調(diào)用完成，返回結(jié)果給客戶端");
 }
 
 @Override
 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
 throws Exception {
 if(null != ex){
 System.out.println("發(fā)生異常:"+ex.getMessage());
 }
 }
 
 @Override
 public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler)
 throws Exception {
 
 // 攔截之后，重新寫回?cái)?shù)據(jù)，將原來(lái)的hello world換成如下字符串
 String resp = "my name is chhliu!";
 response.setContentLength(resp.length());
 response.getOutputStream().write(resp.getBytes());
 
 logger.info(Thread.currentThread().getName() + " 進(jìn)入afterConcurrentHandlingStarted方法");
 } 
}

以上這篇基于Springboot吞吐量?jī)?yōu)化解決方案就是小編分享給大家的全部?jī)?nèi)容了，希望能給大家一個(gè)參考，也希望大家多多支持腳本之家。

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