/*
* Copyright (C) 2012 Square, 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 retrofit2;
/**
* Communicates responses from a server or offline requests. One and only one method will be
* invoked in response to a given request.
* <p>
* Callback methods are executed using the {@link Retrofit} callback executor. When none is
* specified, the following defaults are used:
* <ul>
* <li>Android: Callbacks are executed on the application's main (UI) thread.</li>
* <li>JVM: Callbacks are executed on the background thread which performed the request.</li>
* </ul>
*
* @param <T> Successful response body type.
*/
public interface Callback<T> {
/**
* Invoked for a received HTTP response.
* <p>
* Note: An HTTP response may still indicate an application-level failure such as a 404 or 500.
* Call {@link Response#isSuccessful()} to determine if the response indicates success.
*/
void onResponse(Call<T> call, Response<T> response);
/**
* Invoked when a network exception occurred talking to the server or when an unexpected
* exception occurred creating the request or processing the response.
*/
void onFailure(Call<T> call, Throwable t);
}