content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  
  package com.actiontech.dble.statistic.sql;
  
  import com.actiontech.dble.btrace.provider.StatisticProvider;
  import com.actiontech.dble.statistic.sql.entry.StatisticEntry;
  import com.actiontech.dble.statistic.sql.handler.StatisticDataHandler;
  import com.google.common.util.concurrent.ThreadFactoryBuilder;
  import com.lmax.disruptor.*;
  import com.lmax.disruptor.dsl.Disruptor;
  import com.lmax.disruptor.dsl.ProducerType;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  public class StatisticDisruptor {
      private static final Logger LOGGER = LoggerFactory.getLogger(StatisticDisruptor.class);
  
      private Disruptor<StatisticEvent> disruptor;
      private EventFactory<StatisticEvent> eventFactory;
      private EventTranslatorOneArg<StatisticEvent, StatisticEntry> translator;
  
      public StatisticDisruptor(int ringBufferSize, StatisticDataHandler... dataHandler) {
          StatisticProvider.getStatisticQueueSize(ringBufferSize);
          eventFactory = EVENTFACTORY;
          translator = TRANSLATOR;
          disruptor = new Disruptor<>(eventFactory, ringBufferSize, new ThreadFactoryBuilder().setNameFormat("STATISTIC-%d").build(), ProducerType.MULTI, new LiteBlockingWaitStrategy());
          disruptor.handleEventsWith(dataHandler).then(new EventClearingEventHandler());
          disruptor.setDefaultExceptionHandler(new StatisticExceptionHandler());
          disruptor.start();
      }
  
      public boolean stop() {
          final Disruptor<StatisticEvent> temp = disruptor;
          if (temp == null) {
              return true;
          }
          disruptor = null;
          temp.shutdown();
          if (LOGGER.isDebugEnabled()) {
              LOGGER.debug("disruptor shutdown success");
          }
          return true;
      }
  
      public boolean push(final StatisticEntry entry) {
          boolean succ = disruptor.getRingBuffer().tryPublishEvent(translator, entry);
          if (!succ) {
              disruptor.getRingBuffer().publishEvent(translator, entry);
          }
          return true;
      }
  
      public Disruptor<StatisticEvent> getDisruptor() {
          return disruptor;
      }
  
      private static final EventFactory<StatisticEvent> EVENTFACTORY = new EventFactory<StatisticEvent>() {
          @Override
          public StatisticEvent newInstance() {
              return new StatisticEvent();
          }
      };
  
      private static final EventTranslatorOneArg<StatisticEvent, StatisticEntry> TRANSLATOR = new EventTranslatorOneArg<StatisticEvent, StatisticEntry>() {
          @Override
          public void translateTo(StatisticEvent statisticEvent, long l, StatisticEntry entry) {
              statisticEvent.setEntry(entry);
          }
      };
  
      // exception
      public static final class StatisticExceptionHandler implements ExceptionHandler {
          @Override
          public void handleEventException(Throwable ex, long sequence, Object event) {
              LOGGER.error("Exception processing: {} {} ,exception：", sequence, event, ex);
          }
  
          @Override
          public void handleOnStartException(Throwable ex) {
              LOGGER.error("Exception during onStart for statistic's disruptor ,exception：", ex);
          }
  
          @Override
          public void handleOnShutdownException(Throwable ex) {
              LOGGER.error("Exception during onShutdown for statistic's disruptor ,exception：", ex);
          }
      }
  
      public static final class EventClearingEventHandler implements EventHandler<StatisticEvent> {
  
          @Override
          public void onEvent(StatisticEvent event, long sequence, boolean endOfBatch) throws Exception {
              event.setEntry(null);
          }
      }
  }
  