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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.gms;

import javax.annotation.Nullable;

import org.apache.cassandra.locator.InetAddressAndPort;
import org.apache.cassandra.utils.CassandraVersion;

public interface IGossiper
{
    void register(IEndpointStateChangeSubscriber subscriber);
    void unregister(IEndpointStateChangeSubscriber subscriber);

    @Nullable
    EndpointState getEndpointStateForEndpoint(InetAddressAndPort ep);
    @Nullable
    default CassandraVersion getReleaseVersion(InetAddressAndPort ep)
    {
        EndpointState state = getEndpointStateForEndpoint(ep);
        return state != null ? state.getReleaseVersion() : null;
    }
}