tajo-core/src/main/java/org/apache/tajo/worker/TajoWorkerClientService.java

/**
 * 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.tajo.worker;

import com.google.common.base.Preconditions;
import com.google.protobuf.RpcController;
import com.google.protobuf.ServiceException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.service.AbstractService;
import org.apache.tajo.QueryId;
import org.apache.tajo.conf.TajoConf;
import org.apache.tajo.exception.ReturnStateUtil;
import org.apache.tajo.ipc.ClientProtos.GetQueryHistoryResponse;
import org.apache.tajo.ipc.ClientProtos.QueryIdRequest;
import org.apache.tajo.ipc.QueryMasterClientProtocol;
import org.apache.tajo.rpc.BlockingRpcServer;
import org.apache.tajo.rpc.protocolrecords.PrimitiveProtos;
import org.apache.tajo.util.NetUtils;
import org.apache.tajo.util.history.QueryHistory;

import java.net.InetSocketAddress;

public class TajoWorkerClientService extends AbstractService {
  private static final Log LOG = LogFactory.getLog(TajoWorkerClientService.class);
  private final PrimitiveProtos.BoolProto BOOL_TRUE =
          PrimitiveProtos.BoolProto.newBuilder().setValue(true).build();
  private final PrimitiveProtos.BoolProto BOOL_FALSE =
          PrimitiveProtos.BoolProto.newBuilder().setValue(false).build();

  private BlockingRpcServer rpcServer;
  private InetSocketAddress bindAddr;

  private int port;
  private TajoConf conf;
  private TajoWorker.WorkerContext workerContext;
  private TajoWorkerClientProtocolServiceHandler serviceHandler;

  public TajoWorkerClientService(TajoWorker.WorkerContext workerContext, int port) {
    super(TajoWorkerClientService.class.getName());

    this.port = port;
    this.workerContext = workerContext;
  }

  @Override
  public void init(Configuration conf) {
    Preconditions.checkArgument(conf instanceof TajoConf);
    this.conf = (TajoConf) conf;
    this.serviceHandler = new TajoWorkerClientProtocolServiceHandler();

    // init RPC Server in constructor cause Heartbeat Thread use bindAddr
    try {
      InetSocketAddress initIsa = new InetSocketAddress("0.0.0.0", port);
      if (initIsa.getAddress() == null) {
        throw new IllegalArgumentException("Failed resolve of " + initIsa);
      }

      int workerNum = this.conf.getIntVar(TajoConf.ConfVars.WORKER_SERVICE_RPC_SERVER_WORKER_THREAD_NUM);
      this.rpcServer = new BlockingRpcServer(QueryMasterClientProtocol.class, serviceHandler, initIsa, workerNum);
      this.rpcServer.start();

      this.bindAddr = NetUtils.getConnectAddress(rpcServer.getListenAddress());
      this.port = bindAddr.getPort();
    } catch (Exception e) {
      LOG.error(e.getMessage(), e);
    }
    // Get the master address
    LOG.info(TajoWorkerClientService.class.getSimpleName() + " is bind to " + bindAddr);

    super.init(conf);
  }

  @Override
  public void start() {
    super.start();
  }

  @Override
  public void stop() {
    LOG.info("TajoWorkerClientService stopping");
    if(rpcServer != null) {
      rpcServer.shutdown();
    }
    LOG.info("TajoWorkerClientService stopped");
    super.stop();
  }

  public InetSocketAddress getBindAddr() {
    return bindAddr;
  }

  public class TajoWorkerClientProtocolServiceHandler
          implements QueryMasterClientProtocol.QueryMasterClientProtocolService.BlockingInterface {

    @Override
    public GetQueryHistoryResponse getQueryHistory(RpcController controller, QueryIdRequest request) throws ServiceException {
      GetQueryHistoryResponse.Builder builder = GetQueryHistoryResponse.newBuilder();

      try {
        QueryId queryId = new QueryId(request.getQueryId());
        QueryHistory queryHistory = workerContext.getQueryMaster().getQueryHistory(queryId);

        if (queryHistory != null) {
          builder.setQueryHistory(queryHistory.getProto());
        }
        builder.setState(ReturnStateUtil.OK);
      } catch (Throwable t) {
        LOG.error(t.getMessage(), t);
        builder.setState(ReturnStateUtil.returnError(t));
      }

      return builder.build();
    }
  }
}