/*
    * 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.shardingsphere.data.pipeline.core.execute;
  
  import lombok.extern.slf4j.Slf4j;
  import org.apache.shardingsphere.infra.util.datetime.DateTimeFormatterFactory;
  
  import java.time.Instant;
  import java.time.LocalDateTime;
  import java.time.ZoneId;
  import java.util.concurrent.atomic.AtomicReference;
  
  /**
   * Abstract pipeline lifecycle runnable.
   */
  @Slf4j
  public abstract class AbstractPipelineLifecycleRunnable implements PipelineLifecycleRunnable {
      
      private final AtomicReference<Boolean> running = new AtomicReference<>(null);
      
      private volatile long startTimeMillis;
      
      protected boolean isRunning() {
          Boolean running = this.running.get();
          return null != running && running;
      }
      
      @Override
      public final void start() {
          if (null != running.get() || !running.compareAndSet(null, true)) {
              return;
          }
          startTimeMillis = System.currentTimeMillis();
          runBlocking();
      }
      
      protected abstract void runBlocking();
      
      @Override
      public final void stop() {
          Boolean running = this.running.get();
          if (null == running) {
              this.running.set(false);
              return;
          }
          if (!running) {
              return;
          }
          LocalDateTime startTime = LocalDateTime.ofInstant(Instant.ofEpochMilli(startTimeMillis), ZoneId.systemDefault());
          log.info("stop lifecycle executor {}, startTime={}, cost {} ms", this, startTime.format(DateTimeFormatterFactory.getDatetimeFormatter()), System.currentTimeMillis() - startTimeMillis);
          try {
              doStop();
              // CHECKSTYLE:OFF
          } catch (final RuntimeException ex) {
              // CHECKSTYLE:ON
              log.warn("doStop failed", ex);
          }
          this.running.set(false);
      }
      
      protected abstract void doStop();
      
      @Override
      public final void run() {
          start();
      }
  }