org.apache.flink.runtime.messages.LeaderSessionMessageDecorator Maven / Gradle / Ivy
/*
* 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.flink.runtime.messages;
import java.util.UUID;
/**
* Message decorator which wraps message which implement {@link RequiresLeaderSessionID} into
* a {@link org.apache.flink.runtime.messages.JobManagerMessages.LeaderSessionMessage}.
*/
public class LeaderSessionMessageDecorator implements MessageDecorator {
private static final long serialVersionUID = 5359618147408392706L;
/** Leader session ID with which the RequiresLeaderSessionID messages will be decorated */
private final UUID leaderSessionID;
/**
* Sets the leader session ID with which the messages will be decorated.
*
* @param leaderSessionID Leader session ID to be used for decoration
*/
public LeaderSessionMessageDecorator(UUID leaderSessionID) {
this.leaderSessionID = leaderSessionID;
}
@Override
public Object decorate(Object message) {
if (message instanceof RequiresLeaderSessionID) {
return new JobManagerMessages.LeaderSessionMessage(leaderSessionID, message);
} else {
return message;
}
}
}