/**
* Copyright 2010 Google 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 org.waveprotocol.box.webclient.common.communication.callback;
/**
* A callback which may be called multiple times with a stream of responses.
*
* {@link #onUpdate(Object)} may be called any number of times before either
* {@link #onSuccess(Object)} or {@link #onFailure(Object)}.
*
* @param <R> type of a successful response
* @param <U> type of an update response
* @param <F> type of a failure response
* @author anorth@google.com (Alex North)
*/
public interface StreamingCallback<R, U, F> extends SimpleCallback<R, F> {
/**
* Called when an update arrives.
*
* @param update update object to return for this callback
*/
public void onUpdate(U update);
}