001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.procedure2;
019
020import org.apache.hadoop.hbase.regionserver.HRegionServer;
021import org.apache.yetus.audience.InterfaceAudience;
022
023@InterfaceAudience.Private
024public abstract class BaseRSProcedureCallable implements RSProcedureCallable {
025
026  protected HRegionServer rs;
027
028  private Exception initError;
029
030  @Override
031  public final Void call() throws Exception {
032    if (initError != null) {
033      throw initError;
034    }
035    doCall();
036    return null;
037  }
038
039  @Override
040  public final void init(byte[] parameter, HRegionServer rs) {
041    this.rs = rs;
042    try {
043      initParameter(parameter);
044    } catch (Exception e) {
045      initError = e;
046    }
047  }
048
049  protected abstract void doCall() throws Exception;
050
051  protected abstract void initParameter(byte[] parameter) throws Exception;
052}