/*
 * 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.db;

import java.util.Collection;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import org.apache.cassandra.concurrent.Stage;
import org.apache.cassandra.concurrent.StageManager;
import org.apache.cassandra.exceptions.ConfigurationException;
import org.apache.cassandra.net.IVerbHandler;
import org.apache.cassandra.net.MessageIn;
import org.apache.cassandra.schema.SchemaKeyspace;
import org.apache.cassandra.utils.WrappedRunnable;

Called when node receives updated schema state from the schema migration coordinator node.
Such happens when user makes local schema migration on one of the nodes in the ring
(which is going to act as coordinator) and that node sends (pushes) it's updated schema state
(in form of mutations) to all the alive nodes in the cluster.
/**
 * Called when node receives updated schema state from the schema migration coordinator node.
 * Such happens when user makes local schema migration on one of the nodes in the ring
 * (which is going to act as coordinator) and that node sends (pushes) it's updated schema state
 * (in form of mutations) to all the alive nodes in the cluster.
 */
public class DefinitionsUpdateVerbHandler implements IVerbHandler<Collection<Mutation>>
{
    private static final Logger logger = LoggerFactory.getLogger(DefinitionsUpdateVerbHandler.class);

    public void doVerb(final MessageIn<Collection<Mutation>> message, int id)
    {
        logger.trace("Received schema mutation push from {}", message.from);

        StageManager.getStage(Stage.MIGRATION).submit(new WrappedRunnable()
        {
            public void runMayThrow() throws ConfigurationException
            {
                SchemaKeyspace.mergeSchemaAndAnnounceVersion(message.payload);
            }
        });
    }
}