/*
    * 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.hadoop.hbase.coprocessor.example;
  
  import com.google.protobuf.RpcCallback;
  import com.google.protobuf.RpcController;
  import com.google.protobuf.Service;
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.hadoop.hbase.Coprocessor;
  import org.apache.hadoop.hbase.CoprocessorEnvironment;
  import org.apache.hadoop.hbase.coprocessor.CoprocessorException;
  import org.apache.hadoop.hbase.coprocessor.CoprocessorService;
  import org.apache.hadoop.hbase.coprocessor.RegionCoprocessorEnvironment;
  import org.apache.hadoop.hbase.protobuf.ResponseConverter;
  import org.apache.hadoop.hbase.protobuf.generated.RefreshHFilesProtos;
  import org.apache.hadoop.hbase.regionserver.Store;
  
  import java.io.IOException;
  
  /**
   * Coprocessor endpoint to refresh HFiles on replica.
   * <p>
   * <p>
   * For the protocol buffer definition of the RefreshHFilesService, see the source file located under
   * hbase-protocol/src/main/protobuf/RefreshHFiles.proto.
   * </p>
   */
  public class RefreshHFilesEndpoint extends RefreshHFilesProtos.RefreshHFilesService
    implements Coprocessor, CoprocessorService {
    protected static final Log LOG = LogFactory.getLog(RefreshHFilesEndpoint.class);
    private RegionCoprocessorEnvironment env;
  
    public RefreshHFilesEndpoint() {
    }
  
    @Override
    public Service getService() {
      return this;
    }
  
    @Override
    public void refreshHFiles(RpcController controller, RefreshHFilesProtos.RefreshHFilesRequest request,
                              RpcCallback<RefreshHFilesProtos.RefreshHFilesResponse> done) {
      try {
        for (Store store : env.getRegion().getStores()) {
          LOG.debug("Refreshing HFiles for region: " + store.getRegionInfo().getRegionNameAsString() +
                      " and store: " + store.getColumnFamilyName() + "class:" + store.getClass());
          store.refreshStoreFiles();
        }
      } catch (IOException ioe) {
        LOG.error("Exception while trying to refresh store files: ", ioe);
        ResponseConverter.setControllerException(controller, ioe);
      }
      done.run(RefreshHFilesProtos.RefreshHFilesResponse.getDefaultInstance());
    }
  
    @Override
    public void start(CoprocessorEnvironment env) throws IOException {
      if (env instanceof RegionCoprocessorEnvironment) {
        this.env = (RegionCoprocessorEnvironment) env;
      } else {
        throw new CoprocessorException("Must be loaded on a table region!");
      }
    }
  
    @Override
    public void stop(CoprocessorEnvironment env) throws IOException {
    }
  }