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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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/*
 * 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 extends AsyncPromise implements RequestCallback
{
    public AsyncOneResponse()
    {
        super(ImmediateEventExecutor.INSTANCE);
    }

    public void onResponse(Message response)
    {
        setSuccess(response.payload);
    }

    @VisibleForTesting
    public static  AsyncOneResponse immediate(T value)
    {
        AsyncOneResponse response = new AsyncOneResponse<>();
        response.setSuccess(value);
        return response;
    }
}