/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* Licensed 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 com.linkedin.pinot.core.realtime;
import com.linkedin.pinot.common.segment.SegmentMetadata;
/**
* Allows one to listen to segment metadata changes
*
*
*/
public interface SegmentMetadataListener {
/**
* This method is invoked in three scenarios <br>
* when the listener is initialized <br>
* when the segment metadata is changed on ZK <br>
* when the listener is removed <br>
* Dont see the need to have different methods for each type of call back, its
* better to have the logic idempotent across the three scenarios. If needed
* we can add the change type in the changecontext
*
* @param segmentMetadata
*/
public void onChange(SegmentMetadataChangeContext changeContext,
SegmentMetadata segmentMetadata);
}