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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.
/*
* 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;
}
}