retrofit caliper test w/ 1.2.2 https://microbenchmarks.appspot.com/runs/05515427-5bcc-4f37-b2b9-690f011d9d0f#r:scenario.benchmarkSpec.methodName w/ 1.2.3-SNAPSHOT https://microbenchmarks.appspot.com/runs/5d67625f-2846-4cd4-b668-e497cabe1c2f#r:scenario.benchmarkSpec.methodName

gistfile1.java

package playground.caliper;

import com.google.caliper.Benchmark;
import com.google.common.base.Charsets;
import java.io.IOException;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Executor;
import retrofit.RestAdapter;
import retrofit.client.Client;
import retrofit.client.Header;
import retrofit.client.Request;
import retrofit.client.Response;
import retrofit.http.GET;
import retrofit.http.Path;
import retrofit.mime.TypedByteArray;

import static com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor;

/** tests the relative performance of wiring vs usage w/o taking into account network. */
public class RetrofitBench {
  private static final String API_URL = "https://api.github.com";

  static class Contributor {
    String login;
    int contributions;
  }

  interface GitHub {

    @GET("/repos/{owner}/{repo}/contributors")
    List<Contributor> contributors(@Path("owner") String owner, @Path("repo") String repo);
  }

  @Benchmark public int initializeRetrofit(int reps) {
    int hashCode = 0;
    for (int i = 0; i < reps; ++i) {
      hashCode |= retrofitGitHub().hashCode();
    }
    return hashCode;
  }

  @Benchmark public int useRetrofit(int reps) {
    int size = 0;
    for (int i = 0; i < reps; ++i) {
      size |= retrofitGitHub.contributors("foo", "bar").size();
    }
    return size;
  }

  private final GitHub retrofitGitHub = retrofitGitHub();

  private static GitHub retrofitGitHub() {
    return new RestAdapter.Builder() //
        .setServer(API_URL) //
        .setClient(RetrofitClient.INSTANCE) //
        .setExecutors(SAME_THREAD, SAME_THREAD) //
        .build().create(GitHub.class);
  }

  private final static Executor SAME_THREAD = sameThreadExecutor();

  private static enum RetrofitClient implements Client {
    INSTANCE;

    @Override public Response execute(Request request) throws IOException {
      return retrofitResponse;
    }
  }

  private static final Response retrofitResponse =
      new Response(200, "OK", Collections.<Header>emptyList(),
          new TypedByteArray("application/json", "[]".getBytes(Charsets.UTF_8)));
}