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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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package org.apache.cassandra.service.paxos;
/*
 * 
 * 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.
 * 
 */
import org.apache.cassandra.net.Message;
import org.apache.cassandra.net.MessagingService;

public class PrepareVerbHandler extends AbstractPaxosVerbHandler
{
    public static PrepareVerbHandler instance = new PrepareVerbHandler();

    public static PrepareResponse doPrepare(Commit toPrepare)
    {
        return PaxosState.prepare(toPrepare);
    }

    @Override
    public void processMessage(Message message)
    {
        Message reply = message.responseWith(doPrepare(message.payload));
        MessagingService.instance().send(reply, message.from());
    }
}