Spring Cloud Feign性能优化代码实例

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

server:
 undertow:
  max-http-post-size: 0
# 设置IO线程数, 它主要执行非阻塞的任务,它们会负责多个连接, 默认设置每个CPU核心一个线程,数量和CPU 内核数目一样即可
  io-threads: 4
# 阻塞任务线程池, 当执行类似servlet请求阻塞操作, undertow会从这个线程池中取得线程,它的值设置取决于系统的负载 io-threads*8
  worker-threads: 32
# 以下的配置会影响buffer,这些buffer会用于服务器连接的IO操作,有点类似netty的池化内存管理
# 每块buffer的空间大小,越小的空间被利用越充分
  buffer-size: 1024
# 每个区分配的buffer数量 , 所以pool的大小是buffer-size * buffers-per-region
#  buffers-per-region: 1024 # 这个参数不需要写了
# 是否分配的直接内存
  direct-buffers: true

<dependency>
  <groupId>io.github.openfeign</groupId>
  <artifactId>feign-httpclient</artifactId>
</dependency>

# feign配置
feign:
 hystrix:
  # 在feign中开启hystrix功能，默认情况下feign不开启hystrix功能
  enabled: true
 ## 配置httpclient线程池
 httpclient:
  enabled: true
 okhttp:
  enabled: false

import java.util.Timer;
import java.util.TimerTask;
import java.util.concurrent.TimeUnit;

import org.apache.http.client.HttpClient;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.impl.client.DefaultConnectionKeepAliveStrategy;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class HttpPool {

  @Bean
  public HttpClient httpClient(){
    System.out.println("===== Apache httpclient 初始化连接池开始===" );
    // 生成默认请求配置
    RequestConfig.Builder requestConfigBuilder = RequestConfig.custom();
    // 超时时间
    requestConfigBuilder.setSocketTimeout(5 * 1000);
    // 连接时间
    requestConfigBuilder.setConnectTimeout(5 * 1000);
    RequestConfig defaultRequestConfig = requestConfigBuilder.build();
    // 连接池配置
    // 长连接保持30秒
    final PoolingHttpClientConnectionManager pollingConnectionManager = new PoolingHttpClientConnectionManager(30, TimeUnit.MILLISECONDS);
    // 总连接数
    pollingConnectionManager.setMaxTotal(1000);
    // 同路由的并发数
    pollingConnectionManager.setDefaultMaxPerRoute(100);

    // httpclient 配置
    HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
    // 保持长连接配置，需要在头添加Keep-Alive
    httpClientBuilder.setKeepAliveStrategy(new DefaultConnectionKeepAliveStrategy());
    httpClientBuilder.setConnectionManager(pollingConnectionManager);
    httpClientBuilder.setDefaultRequestConfig(defaultRequestConfig);
    HttpClient client = httpClientBuilder.build();

    // 启动定时器，定时回收过期的连接
    Timer timer = new Timer();
    timer.schedule(new TimerTask() {
      @Override
      public void run() {
        System.out.println("=====closeIdleConnections===");
        pollingConnectionManager.closeExpiredConnections();
        pollingConnectionManager.closeIdleConnections(5, TimeUnit.SECONDS);
      }
    }, 10 * 1000, 5 * 1000);
    System.out.println("===== Apache httpclient 初始化连接池完毕===");

    return client;
  }
}

<dependency>
  <groupId>org.springframework.cloud</groupId>
  <artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>

# 配置hystrix的参数
hystrix:
 threadpool:
  # default: 默认参数，作用的所有的hystrix的客户端,如果需要对某个具体的接口，可以写接口 方法名称
  default:
   coreSize: 500
 command:
  default:
   fallback:
    # 是否开启回退方法
    enabled: true
   execution:
    isolation:
     thread:
      timeoutInMilliseconds: 30000 #缺省为1000