added code for retry feature with timeout exception cases

build.gradle

@@ -19,7 +19,7 @@ configurations {
 
 repositories {
     flatDir {
-        dirs '/Users/sivanagasomeswaragandhijatla/.m2/repository/com/nisum/exceptionservice/0.0.1'
+        dirs 'C:\\Users\\abogari\\.m2\\repository\\com\\nisum\\exceptionservice\\0.0.1'
        // dirs '/Users/sivanagagasomeswaragandhijatla/.m2/repository/com/nisum/exceptionservice/0.0.1'
     }
     mavenCentral()

src/main/java/com/nisum/offertransactionservice/client/FeignClientService.java → src/main/java/com/nisum/offertransactionservice/client/PromotionEngineFeignClient.java

 package com.nisum.offertransactionservice.client;
 
+import com.nisum.offertransactionservice.config.FeignClientConfig;
 import com.nisum.offertransactionservice.dto.PERequest;
 import com.nisum.offertransactionservice.dto.PEResponse;
 import org.springframework.cloud.openfeign.FeignClient;
 import org.springframework.http.ResponseEntity;
 import org.springframework.web.bind.annotation.PostMapping;
 
-@FeignClient(name = "${pe.application.name}")
-public interface FeignClientService {
+@FeignClient(name = "${pe.application.name}",configuration = FeignClientConfig.class)
+public interface PromotionEngineFeignClient {
 
     @PostMapping(value = "${endpoint.url.promotionEngineUrl}")
     ResponseEntity<PEResponse> callPEService(PERequest peRequest);

src/main/java/com/nisum/offertransactionservice/config/CustomErrorDecoder.java

+package com.nisum.offertransactionservice.config;
+
+import feign.FeignException;
+import feign.Request;
+import feign.Response;
+import feign.RetryableException;
+import feign.codec.ErrorDecoder;
+import org.springframework.http.HttpStatus;
+
+import java.util.Date;
+
+public class CustomErrorDecoder implements ErrorDecoder {
+
+    private final ErrorDecoder defaultErrorDecoder = new Default();
+
+    @Override
+    public Exception decode(String methodKey, Response response) {
+        Exception exception = defaultErrorDecoder.decode(methodKey, response);
+
+        if(response.status() == HttpStatus.REQUEST_TIMEOUT.value()){
+            return new RetryableException(408,"408 error", response.request().httpMethod(), new Date(),response.request());
+        }
+        return exception;
+    }
+}
+

src/main/java/com/nisum/offertransactionservice/config/CustomRetryer.java

+package com.nisum.offertransactionservice.config;
+
+import feign.RetryableException;
+import feign.Retryer;
+
+public class CustomRetryer implements Retryer {
+
+    private final Integer maxAttempts;
+    private final Long backoff;
+    int attempt;
+
+    public CustomRetryer(Long backoff, Integer maxAttempts) {
+        this.backoff = backoff;
+        this.maxAttempts = maxAttempts;
+        this.attempt = 1;
+    }
+
+    public void continueOrPropagate(RetryableException e) {
+        if (attempt++ >= maxAttempts) {
+            throw e;
+        }
+
+        try {
+            Thread.sleep(backoff);
+        } catch (InterruptedException ignored) {
+            Thread.currentThread().interrupt();
+        }
+    }
+
+    @Override
+    public Retryer clone() {
+        return new CustomRetryer(backoff, maxAttempts);
+    }
+}

src/main/java/com/nisum/offertransactionservice/config/FeignClientConfig.java

+package com.nisum.offertransactionservice.config;
+
+import feign.Retryer;
+import feign.codec.ErrorDecoder;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class FeignClientConfig {
+
+    @Value("#{new Integer('${maxattempts}')}")
+    private Integer maxAttempts;
+
+    @Value("#{new Long('${backoff}')}")
+    private Long backoff;
+
+    @Bean
+    public Retryer retryer() {
+        return new CustomRetryer(backoff,maxAttempts);
+    }
+
+    @Bean
+    public ErrorDecoder errorDecoder() {
+        return new CustomErrorDecoder();
+    }
+}
\ No newline at end of file

src/main/java/com/nisum/offertransactionservice/service/OfferCallingPEService.java

@@ -2,23 +2,19 @@ package com.nisum.offertransactionservice.service;
 
 
 import com.nisum.offertransactionservice.client.ClientService;
-import com.nisum.offertransactionservice.client.FeignClientService;
+import com.nisum.offertransactionservice.client.PromotionEngineFeignClient;
 import com.nisum.offertransactionservice.converter.OfferConvertion;
 import com.nisum.offertransactionservice.dao.OfferLookupRepo;
 import com.nisum.offertransactionservice.dao.OfferMetaDataRepo;
 import com.nisum.offertransactionservice.dto.*;
 import com.nisum.offertransactionservice.genericexception.GlobalApiGenericException;
 import com.nisum.offertransactionservice.model.*;
-import com.nisum.offertransactionservice.util.ExceptionUtil;
 import lombok.extern.slf4j.Slf4j;
 import org.mapstruct.factory.Mappers;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.context.annotation.PropertySource;
-import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
 import org.springframework.stereotype.Service;
-import org.springframework.web.reactive.function.client.ClientResponse;
-import reactor.core.publisher.Flux;
 
 import javax.validation.constraints.NotNull;
 import java.util.*;
@@ -32,7 +28,7 @@ public class OfferCallingPEService {
     OfferConvertion INSTANCE = Mappers.getMapper(OfferConvertion.class);
 
     @Autowired
-    private FeignClientService feignClientService;
+    private PromotionEngineFeignClient feignClientService;
 
 
     @Autowired

src/main/resources/application.properties

@@ -9,4 +9,10 @@ endpoint.url.spBaseUrl=http://localhost:7070
 server.port = 7072
 spring.application.name=ots
 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka
-//TODO: add refresh eureka endpoint properties
\ No newline at end of file
+//TODO: add refresh eureka endpoint properties
+endpoints.restart.enabled=true
+endpoints.shutdown.enabled=true
+endpoints.health.sensitive=false
+
+maxattempts=3
+backoff=2000
\ No newline at end of file