org.apache.cassandra.db.SchemaCheckVerbHandler Maven / Gradle / Ivy
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* distributed with this work for additional information
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* 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
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*/
package org.apache.cassandra.db;
import java.util.UUID;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.net.IVerbHandler;
import org.apache.cassandra.net.MessageIn;
import org.apache.cassandra.net.MessageOut;
import org.apache.cassandra.net.MessagingService;
import org.apache.cassandra.utils.UUIDSerializer;
public class SchemaCheckVerbHandler implements IVerbHandler
{
private final Logger logger = LoggerFactory.getLogger(SchemaCheckVerbHandler.class);
public void doVerb(MessageIn message, int id)
{
logger.trace("Received schema check request.");
/*
3.11 is special here: We return the 3.0 compatible version, if the requesting node
is running 3.0. Otherwise the "real" schema version.
*/
MessageOut response = new MessageOut<>(MessagingService.Verb.INTERNAL_RESPONSE,
Schema.instance.getVersion(),
UUIDSerializer.serializer);
MessagingService.instance().sendReply(response, id, message.from);
}
}