| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.cassandra.net; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| |
| import io.netty.util.concurrent.ImmediateEventExecutor; |
| |
| /** |
| * A callback specialized for returning a value from a single target; that is, this is for messages |
| * that we only send to one recipient. |
| */ |
| public class AsyncOneResponse<T> extends AsyncPromise<T> implements RequestCallback<T> |
| { |
| public AsyncOneResponse() |
| { |
| super(ImmediateEventExecutor.INSTANCE); |
| } |
| |
| public void onResponse(Message<T> response) |
| { |
| setSuccess(response.payload); |
| } |
| |
| @VisibleForTesting |
| public static <T> AsyncOneResponse<T> immediate(T value) |
| { |
| AsyncOneResponse<T> response = new AsyncOneResponse<>(); |
| response.setSuccess(value); |
| return response; |
| } |
| } |