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.regionserver.handler;
019
020import org.apache.hadoop.hbase.executor.EventHandler;
021import org.apache.hadoop.hbase.procedure2.RSProcedureCallable;
022import org.apache.hadoop.hbase.regionserver.HRegionServer;
023import org.apache.yetus.audience.InterfaceAudience;
024import org.slf4j.Logger;
025import org.slf4j.LoggerFactory;
026import org.slf4j.MDC;
027
028/**
029 * A event handler for running procedure.
030 */
031@InterfaceAudience.Private
032public class RSProcedureHandler extends EventHandler {
033
034  private static final Logger LOG = LoggerFactory.getLogger(RSProcedureHandler.class);
035
036  private final long procId;
037
038  // active time of the master that sent procedure request, used for fencing
039  private final long initiatingMasterActiveTime;
040
041  private final RSProcedureCallable callable;
042
043  public RSProcedureHandler(HRegionServer rs, long procId, long initiatingMasterActiveTime,
044    RSProcedureCallable callable) {
045    super(rs, callable.getEventType());
046    this.procId = procId;
047    this.callable = callable;
048    this.initiatingMasterActiveTime = initiatingMasterActiveTime;
049  }
050
051  @Override
052  public void process() {
053    Throwable error = null;
054    byte[] procResultData = null;
055    try {
056      MDC.put("pid", Long.toString(procId));
057      procResultData = callable.call();
058    } catch (Throwable t) {
059      LOG.error("pid={}", this.procId, t);
060      error = t;
061    } finally {
062      ((HRegionServer) server).remoteProcedureComplete(procId, initiatingMasterActiveTime, error,
063        procResultData);
064    }
065  }
066}