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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.example.github;
import java.util.List;
import feign.Feign;
import feign.Logger;
import feign.Param;
import feign.RequestLine;
import feign.Response;
import feign.codec.Decoder;
import feign.codec.ErrorDecoder;
import feign.gson.GsonDecoder;
/**
* adapted from {@code com.example.retrofit.GitHubClient}
*/
public class GitHubExample {
public static void main(String... args) throws InterruptedException {
Decoder decoder = new GsonDecoder();
GitHub github = Feign.builder()
.decoder(decoder)
.errorDecoder(new GitHubErrorDecoder(decoder))
.logger(new Logger.ErrorLogger())
.logLevel(Logger.Level.BASIC)
.target(GitHub.class, "https://api.github.com");
System.out.println("Let's fetch and print a list of the contributors to this library.");
List<Contributor> contributors = github.contributors("netflix", "feign");
for (Contributor contributor : contributors) {
System.out.println(contributor.login + " (" + contributor.contributions + ")");
}
try {
contributors = github.contributors("netflix", "some-unknown-project");
} catch (GitHubClientError e) {
System.out.println(e.error.message);
}
}
interface GitHub {
@RequestLine("GET /repos/{owner}/{repo}/contributors")
List<Contributor> contributors(@Param("owner") String owner, @Param("repo") String repo);
}
static class Contributor {
String login;
int contributions;
}
static class ClientError {
String message;
List<Error> errors;
}
static class Error {
String resource;
String field;
String code;
}
static class GitHubErrorDecoder implements ErrorDecoder {
final Decoder decoder;
final ErrorDecoder defaultDecoder = new ErrorDecoder.Default();
public GitHubErrorDecoder(Decoder decoder) {
this.decoder = decoder;
}
public Exception decode(String methodKey, Response response) {
if (response.status() >= 400 && response.status() < 500) {
try {
ClientError error = (ClientError) decoder.decode(response, ClientError.class );
return new GitHubClientError(response.status(), error);
} catch (Exception e) {
e.printStackTrace();
}
}
return defaultDecoder.decode(methodKey, response);
}
}
static class GitHubClientError extends RuntimeException {
private static final long serialVersionUID = 0;
ClientError error;
protected GitHubClientError(int status, ClientError error) {
super("client error " + status);
this.error = error;
}
}
}