hadoop-hdds/container-service/src/main/java/org/apache/hadoop/ozone/container/common/statemachine/commandhandler/ClosePipelineCommandHandler.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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.ozone.container.common.statemachine.commandhandler;

import org.apache.hadoop.hdds.protocol.DatanodeDetails;
import org.apache.hadoop.hdds.protocol.proto.
    StorageContainerDatanodeProtocolProtos.SCMCommandProto;
import org.apache.hadoop.hdds.scm.pipeline.PipelineID;
import org.apache.hadoop.ozone.container.common.statemachine
    .SCMConnectionManager;
import org.apache.hadoop.ozone.container.common.statemachine.StateContext;
import org.apache.hadoop.ozone.container.common.transport.server
    .XceiverServerSpi;
import org.apache.hadoop.ozone.container.ozoneimpl.OzoneContainer;
import org.apache.hadoop.ozone.protocol.commands.ClosePipelineCommand;
import org.apache.hadoop.ozone.protocol.commands.SCMCommand;
import org.apache.hadoop.util.Time;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.util.concurrent.atomic.AtomicLong;

/**
 * Handler for close pipeline command received from SCM.
 */
public class ClosePipelineCommandHandler implements CommandHandler {

  private static final Logger LOG =
      LoggerFactory.getLogger(ClosePipelineCommandHandler.class);

  private AtomicLong invocationCount = new AtomicLong(0);
  private long totalTime;

  /**
   * Constructs a closePipelineCommand handler.
   */
  public ClosePipelineCommandHandler() {
  }

  /**
   * Handles a given SCM command.
   *
   * @param command           - SCM Command
   * @param ozoneContainer    - Ozone Container.
   * @param context           - Current Context.
   * @param connectionManager - The SCMs that we are talking to.
   */
  @Override
  public void handle(SCMCommand command, OzoneContainer ozoneContainer,
      StateContext context, SCMConnectionManager connectionManager) {
    invocationCount.incrementAndGet();
    final long startTime = Time.monotonicNow();
    final DatanodeDetails dn = context.getParent().getDatanodeDetails();
    ClosePipelineCommand closePipelineCommand = (ClosePipelineCommand) command;
    final PipelineID pipelineID = closePipelineCommand.getPipelineID();

    try {
      XceiverServerSpi server = ozoneContainer.getWriteChannel();
      server.removeGroup(pipelineID.getProtobuf());
      LOG.info("Close Pipeline {} command on datanode {}.", pipelineID,
          dn.getUuidString());
    } catch (IOException e) {
      LOG.error("Can't close pipeline {}", pipelineID, e);
    } finally {
      long endTime = Time.monotonicNow();
      totalTime += endTime - startTime;
    }
  }

  /**
   * Returns the command type that this command handler handles.
   *
   * @return Type
   */
  @Override
  public SCMCommandProto.Type getCommandType() {
    return SCMCommandProto.Type.closePipelineCommand;
  }

  /**
   * Returns number of times this handler has been invoked.
   *
   * @return int
   */
  @Override
  public int getInvocationCount() {
    return (int)invocationCount.get();
  }

  /**
   * Returns the average time this function takes to run.
   *
   * @return long
   */
  @Override
  public long getAverageRunTime() {
    if (invocationCount.get() > 0) {
      return totalTime / invocationCount.get();
    }
    return 0;
  }
}