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GitHubExample.java
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/**
* Copyright 2012-2020 The Feign 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 feign.examples;
import com.google.gson.Gson;
import com.google.gson.JsonIOException;
import java.io.IOException;
import java.io.Reader;
import java.lang.reflect.Type;
import java.util.List;
import feign.Feign;
import feign.Logger;
import feign.Param;
import feign.RequestLine;
import feign.Response;
import feign.codec.Decoder;
import static feign.Util.UTF_8;
import static feign.Util.ensureClosed;
/**
* adapted from {@code com.example.retrofit.GitHubClient}
*/
public class GitHubExample {
public static void main(String... args) {
GitHub github = Feign.builder()
.decoder(new GsonDecoder())
.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 + ")");
}
}
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;
}
/**
* Here's how it looks to write a decoder. Note: you can instead use {@code feign-gson}!
*/
static class GsonDecoder implements Decoder {
private final Gson gson = new Gson();
@Override
public Object decode(Response response, Type type) throws IOException {
if (void.class == type || response.body() == null) {
return null;
}
Reader reader = response.body().asReader(UTF_8);
try {
return gson.fromJson(reader, type);
} catch (JsonIOException e) {
if (e.getCause() != null && e.getCause() instanceof IOException) {
throw IOException.class.cast(e.getCause());
}
throw e;
} finally {
ensureClosed(reader);
}
}
}
}