hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/ChangedReadersObserver.java

   1 /**
   2  *
   3  * Licensed to the Apache Software Foundation (ASF) under one
   4  * or more contributor license agreements.  See the NOTICE file
   5  * distributed with this work for additional information
   6  * regarding copyright ownership.  The ASF licenses this file
   7  * to you under the Apache License, Version 2.0 (the
   8  * "License"); you may not use this file except in compliance
   9  * with the License.  You may obtain a copy of the License at
  10  *
  11  *     http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  * Unless required by applicable law or agreed to in writing, software
  14  * distributed under the License is distributed on an "AS IS" BASIS,
  15  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  * See the License for the specific language governing permissions and
  17  * limitations under the License.
  18  */
  19 package org.apache.hadoop.hbase.regionserver;
  20
  21 import java.io.IOException;
  22 import java.util.List;
  23
  24 import org.apache.yetus.audience.InterfaceAudience;
  25
  26 /**
  27  * If set of MapFile.Readers in Store change, implementors are notified.
  28  */
  29 @InterfaceAudience.Private
  30 public interface ChangedReadersObserver {
  31
  32   /**
  33    * @return the read point of the current scan
  34    */
  35   long getReadPoint();
  36
  37   /**
  38    * Notify observers.
  39    * @param sfs The new files
  40    * @param memStoreScanners scanner of current memstore
  41    * @throws IOException e
  42    */
  43   void updateReaders(List<HStoreFile> sfs, List<KeyValueScanner> memStoreScanners) throws IOException;
  44 }