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/*
 * 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.hudi.client;

import org.apache.hudi.async.HoodieAsyncService;
import org.apache.hudi.common.table.timeline.HoodieActiveTimeline;
import org.apache.hudi.common.util.collection.Pair;
import org.apache.hudi.exception.HoodieException;
import org.apache.log4j.LogManager;
import org.apache.log4j.Logger;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * Clean service running concurrently with write operation.
 */
class AsyncCleanerService extends HoodieAsyncService {

  private static final Logger LOG = LogManager.getLogger(AsyncCleanerService.class);

  private final AbstractHoodieWriteClient writeClient;
  private final transient ExecutorService executor = Executors.newSingleThreadExecutor();

  protected AsyncCleanerService(AbstractHoodieWriteClient writeClient) {
    this.writeClient = writeClient;
  }

  @Override
  protected Pair startService() {
    String instantTime = HoodieActiveTimeline.createNewInstantTime();
    LOG.info("Auto cleaning is enabled. Running cleaner async to write operation at instant time " + instantTime);
    return Pair.of(CompletableFuture.supplyAsync(() -> {
      writeClient.clean(instantTime);
      return true;
    }, executor), executor);
  }

  public static AsyncCleanerService startAsyncCleaningIfEnabled(AbstractHoodieWriteClient writeClient) {
    AsyncCleanerService asyncCleanerService = null;
    if (writeClient.getConfig().isAutoClean() && writeClient.getConfig().isAsyncClean()) {
      asyncCleanerService = new AsyncCleanerService(writeClient);
      asyncCleanerService.start(null);
    } else {
      LOG.info("Async auto cleaning is not enabled. Not running cleaner now");
    }
    return asyncCleanerService;
  }

  public static void waitForCompletion(AsyncCleanerService asyncCleanerService) {
    if (asyncCleanerService != null) {
      LOG.info("Waiting for async cleaner to finish");
      try {
        asyncCleanerService.waitForShutdown();
      } catch (Exception e) {
        throw new HoodieException("Error waiting for async cleaning to finish", e);
      }
    }
  }

  public static void forceShutdown(AsyncCleanerService asyncCleanerService) {
    if (asyncCleanerService != null) {
      LOG.info("Shutting down async cleaner");
      asyncCleanerService.shutdown(true);
    }
  }
}