OkHttp实现延时重试

男娘i 2022-06-07 00:36 682阅读 0赞

## 场景分析 ##

很多项目由于有callback，且失败重试和重定向需求，因此需要实现OkHttp失败重试

## 解决方案 ##

package com.gomefinance.esign.httpretry;
    
    import lombok.extern.slf4j.Slf4j;
    import okhttp3.Interceptor;
    import okhttp3.Request;
    import okhttp3.Response;
    
    import java.io.IOException;
    import java.io.InterruptedIOException;
    import java.util.List;
    
    /**
     * User: Administrator
     * Date: 2017/9/19
     * Description:
     */
    
    @Slf4j
    public class MyOkHttpRetryInterceptor implements Interceptor {
        public int executionCount;//最大重试次数
        private long retryInterval;//重试的间隔
        MyOkHttpRetryInterceptor(Builder builder) {
            this.executionCount = builder.executionCount;
            this.retryInterval = builder.retryInterval;
        }
    
    
    
        @Override
        public Response intercept(Chain chain) throws IOException {
            Request request = chain.request();
            Response response = doRequest(chain, request);
            int retryNum = 0;
            while ((response == null || !response.isSuccessful()) && retryNum <= executionCount) {
                log.info("intercept Request is not successful - {}",retryNum);
                final long nextInterval = getRetryInterval();
                try {
                    log.info("Wait for {}",nextInterval);
                    Thread.sleep(nextInterval);
                } catch (final InterruptedException e) {
                    Thread.currentThread().interrupt();
                    throw new InterruptedIOException();
                }
                retryNum++;
                // retry the request
                response = doRequest(chain, request);
            }
            return response;
        }
    
        private Response doRequest(Chain chain, Request request) {
            Response response = null;
            try {
                response = chain.proceed(request);
            } catch (Exception e) {
            }
            return response;
        }
    
        /**
         * retry间隔时间
         */
        public long getRetryInterval() {
            return this.retryInterval;
        }
    
        public static final class Builder {
            private int executionCount;
            private long retryInterval;
            public Builder() {
                executionCount = 3;
                retryInterval = 1000;
            }
    
            public MyOkHttpRetryInterceptor.Builder executionCount(int executionCount){
                this.executionCount =executionCount;
                return this;
            }
    
            public MyOkHttpRetryInterceptor.Builder retryInterval(long retryInterval){
                this.retryInterval =retryInterval;
                return this;
            }
            public MyOkHttpRetryInterceptor build() {
                return new MyOkHttpRetryInterceptor(this);
            }
        }
    
    }

## 实现方法 ##

MyOkHttpRetryInterceptor myOkHttpRetryInterceptor = new MyOkHttpRetryInterceptor.Builder()
                    .executionCount(3)
                    .retryInterval(1000)
                    .build();
    new OkHttpClient.Builder()
                    .retryOnConnectionFailure(true)
                    .addInterceptor(myOkHttpRetryInterceptor)
                    .connectionPool(new ConnectionPool())
                    .connectTimeout(3000, TimeUnit.MILLISECONDS)
                    .readTimeout(10000, TimeUnit.MILLISECONDS)
                    .build();

[实现请求失败切换IP重试的方案][IP]

[IP]: http://blog.csdn.net/gengqiquan/article/details/52200393