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111 changes: 111 additions & 0 deletions
111
...n/java/org/springframework/cloud/netflix/ribbon/support/RetryableLoadBalancingClient.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* | ||
| * | ||
| * Copyright 2013-2016 the original author or authors. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| * | ||
| */ | ||
|
|
||
| package org.springframework.cloud.netflix.ribbon.support; | ||
|
|
||
| import java.io.IOException; | ||
| import org.apache.commons.lang.BooleanUtils; | ||
| import org.springframework.cloud.client.ServiceInstance; | ||
| import org.springframework.cloud.client.loadbalancer.InterceptorRetryPolicy; | ||
| import org.springframework.cloud.client.loadbalancer.LoadBalancedRetryPolicy; | ||
| import org.springframework.cloud.client.loadbalancer.LoadBalancedRetryPolicyFactory; | ||
| import org.springframework.cloud.client.loadbalancer.ServiceInstanceChooser; | ||
| import org.springframework.cloud.netflix.feign.ribbon.FeignRetryPolicy; | ||
| import org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient; | ||
| import org.springframework.cloud.netflix.ribbon.ServerIntrospector; | ||
| import org.springframework.http.HttpRequest; | ||
| import org.springframework.retry.RetryCallback; | ||
| import org.springframework.retry.policy.NeverRetryPolicy; | ||
| import org.springframework.retry.support.RetryTemplate; | ||
| import com.netflix.client.IResponse; | ||
| import com.netflix.client.RequestSpecificRetryHandler; | ||
| import com.netflix.client.RetryHandler; | ||
| import com.netflix.client.config.IClientConfig; | ||
| import com.netflix.loadbalancer.ILoadBalancer; | ||
| import com.netflix.loadbalancer.Server; | ||
|
|
||
| /** | ||
| * A load balancing client which uses Spring Retry to retry failed requests. | ||
| * @author Ryan Baxter | ||
| */ | ||
| public abstract class RetryableLoadBalancingClient<S extends ContextAwareRequest, T extends IResponse, D> | ||
| extends AbstractLoadBalancingClient<S, T, D> implements ServiceInstanceChooser { | ||
|
|
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| protected LoadBalancedRetryPolicyFactory loadBalancedRetryPolicyFactory = | ||
| new LoadBalancedRetryPolicyFactory.NeverRetryFactory(); | ||
|
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| @Deprecated | ||
| public RetryableLoadBalancingClient() { | ||
| super(); | ||
| } | ||
|
|
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| @Deprecated | ||
| public RetryableLoadBalancingClient(final ILoadBalancer lb) { | ||
| super(lb); | ||
| } | ||
|
|
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| public RetryableLoadBalancingClient(IClientConfig config, ServerIntrospector serverIntrospector) { | ||
| super(config, serverIntrospector); | ||
| } | ||
|
|
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| public RetryableLoadBalancingClient(D delegate, IClientConfig config, ServerIntrospector serverIntrospector) { | ||
| super(delegate, config, serverIntrospector); | ||
| } | ||
|
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| public RetryableLoadBalancingClient(IClientConfig iClientConfig, ServerIntrospector serverIntrospector, | ||
| LoadBalancedRetryPolicyFactory loadBalancedRetryPolicyFactory) { | ||
| this(iClientConfig, serverIntrospector); | ||
| this.loadBalancedRetryPolicyFactory = loadBalancedRetryPolicyFactory; | ||
| } | ||
|
|
||
| /** | ||
| * Executes a {@link S} using Spring Retry. | ||
| * @param request The request to execute. | ||
| * @param callback The retry callback to use. | ||
| * @return The response. | ||
| * @throws Exception Thrown if there is an error making the request and a retry cannot be completed successfully. | ||
| */ | ||
| protected T executeWithRetry(S request, RetryCallback<T, IOException> callback) throws Exception { | ||
| LoadBalancedRetryPolicy retryPolicy = loadBalancedRetryPolicyFactory.create(this.getClientName(), this); | ||
| RetryTemplate retryTemplate = new RetryTemplate(); | ||
| boolean retryable = request.getContext() == null ? true : | ||
| BooleanUtils.toBooleanDefaultIfNull(request.getContext().getRetryable(), true); | ||
| retryTemplate.setRetryPolicy(retryPolicy == null || !retryable ? new NeverRetryPolicy() | ||
| : new RetryPolicy(request, retryPolicy, this, this.getClientName())); | ||
| return retryTemplate.execute(callback); | ||
| } | ||
|
|
||
| @Override | ||
| public ServiceInstance choose(String serviceId) { | ||
| Server server = this.getLoadBalancer().chooseServer(serviceId); | ||
| return new RibbonLoadBalancerClient.RibbonServer(serviceId, | ||
| server); | ||
| } | ||
|
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| @Override | ||
| public RequestSpecificRetryHandler getRequestSpecificRetryHandler(S request, IClientConfig requestConfig) { | ||
| return new RequestSpecificRetryHandler(false, false, RetryHandler.DEFAULT, null); | ||
| } | ||
|
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| static class RetryPolicy extends FeignRetryPolicy { | ||
| public RetryPolicy(HttpRequest request, LoadBalancedRetryPolicy policy, ServiceInstanceChooser serviceInstanceChooser, String serviceName) { | ||
| super(request, policy, serviceInstanceChooser, serviceName); | ||
| } | ||
| } | ||
|
|
||
| } |
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