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LBClient.java
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/*
* Copyright 2013 Netflix, Inc.
*
* 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 feign.ribbon;
import com.netflix.client.AbstractLoadBalancerAwareClient;
import com.netflix.client.ClientException;
import com.netflix.client.ClientRequest;
import com.netflix.client.IResponse;
import com.netflix.client.RequestSpecificRetryHandler;
import com.netflix.client.RetryHandler;
import com.netflix.client.config.CommonClientConfigKey;
import com.netflix.client.config.IClientConfig;
import com.netflix.loadbalancer.ILoadBalancer;
import java.io.IOException;
import java.net.URI;
import java.util.Collection;
import java.util.Map;
import feign.Client;
import feign.Request;
import feign.RequestTemplate;
import feign.Response;
public final class LBClient extends
AbstractLoadBalancerAwareClient<LBClient.RibbonRequest, LBClient.RibbonResponse> {
private final int connectTimeout;
private final int readTimeout;
private final IClientConfig clientConfig;
public static LBClient create(ILoadBalancer lb, IClientConfig clientConfig) {
return new LBClient(lb, clientConfig);
}
LBClient(ILoadBalancer lb, IClientConfig clientConfig) {
super(lb, clientConfig);
this.clientConfig = clientConfig;
connectTimeout = clientConfig.get(CommonClientConfigKey.ConnectTimeout);
readTimeout = clientConfig.get(CommonClientConfigKey.ReadTimeout);
}
@Override
public RibbonResponse execute(RibbonRequest request, IClientConfig configOverride)
throws IOException {
Request.Options options;
if (configOverride != null) {
options =
new Request.Options(
configOverride.get(CommonClientConfigKey.ConnectTimeout, connectTimeout),
(configOverride.get(CommonClientConfigKey.ReadTimeout, readTimeout)));
} else {
options = new Request.Options(connectTimeout, readTimeout);
}
Response response = request.client().execute(request.toRequest(), options);
return new RibbonResponse(request.getUri(), response);
}
@Override
public RequestSpecificRetryHandler getRequestSpecificRetryHandler(
RibbonRequest request, IClientConfig requestConfig) {
if (clientConfig.get(CommonClientConfigKey.OkToRetryOnAllOperations, false)) {
return new RequestSpecificRetryHandler(true, true, this.getRetryHandler(), requestConfig);
}
if (!request.toRequest().method().equals("GET")) {
return new RequestSpecificRetryHandler(true, false, this.getRetryHandler(), requestConfig);
} else {
return new RequestSpecificRetryHandler(true, true, this.getRetryHandler(), requestConfig);
}
}
static class RibbonRequest extends ClientRequest implements Cloneable {
private final Request request;
private final Client client;
RibbonRequest(Client client, Request request, URI uri) {
this.client = client;
this.request = request;
setUri(uri);
}
Request toRequest() {
return new RequestTemplate()
.method(request.method())
.append(getUri().toASCIIString())
.headers(request.headers())
.body(request.body(), request.charset())
.request();
}
Client client() {
return client;
}
public Object clone() {
return new RibbonRequest(client, request, getUri());
}
}
static class RibbonResponse implements IResponse {
private final URI uri;
private final Response response;
RibbonResponse(URI uri, Response response) {
this.uri = uri;
this.response = response;
}
@Override
public Object getPayload() throws ClientException {
return response.body();
}
@Override
public boolean hasPayload() {
return response.body() != null;
}
@Override
public boolean isSuccess() {
return response.status() == 200;
}
@Override
public URI getRequestedURI() {
return uri;
}
@Override
public Map<String, Collection<String>> getHeaders() {
return response.headers();
}
Response toResponse() {
return response;
}
@Override
public void close() throws IOException {
if (response != null && response.body() != null) {
response.body().close();
}
}
}
}