code: /*
   * 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.skywalking.oap.server.storage.plugin.banyandb;
  
  import java.util.List;
  import java.util.concurrent.CompletableFuture;
  import java.util.function.Function;
  import org.apache.skywalking.banyandb.v1.client.MeasureBulkWriteProcessor;
  import org.apache.skywalking.banyandb.v1.client.StreamBulkWriteProcessor;
  import org.apache.skywalking.oap.server.core.storage.AbstractDAO;
  import org.apache.skywalking.oap.server.core.storage.IBatchDAO;
  import org.apache.skywalking.oap.server.library.client.request.InsertRequest;
  import org.apache.skywalking.oap.server.library.client.request.PrepareRequest;
  import org.apache.skywalking.oap.server.library.util.CollectionUtils;
  import org.apache.skywalking.oap.server.storage.plugin.banyandb.measure.BanyanDBMeasureInsertRequest;
  import org.apache.skywalking.oap.server.storage.plugin.banyandb.measure.BanyanDBMeasureUpdateRequest;
  import org.apache.skywalking.oap.server.storage.plugin.banyandb.stream.BanyanDBStreamInsertRequest;
  
  public class BanyanDBBatchDAO extends AbstractDAO<BanyanDBStorageClient> implements IBatchDAO {
      private static final Object STREAM_SYNCHRONIZER = new Object();
      private static final Object MEASURE_SYNCHRONIZER = new Object();
      private StreamBulkWriteProcessor streamBulkWriteProcessor;
  
      private MeasureBulkWriteProcessor measureBulkWriteProcessor;
  
      private final int maxBulkSize;
  
      private final int flushInterval;
  
      private final int concurrency;
  
      public BanyanDBBatchDAO(BanyanDBStorageClient client, int maxBulkSize, int flushInterval, int concurrency) {
          super(client);
          this.maxBulkSize = maxBulkSize;
          this.flushInterval = flushInterval;
          this.concurrency = concurrency;
      }
  
      @Override
      public void insert(InsertRequest insertRequest) {
          if (insertRequest instanceof BanyanDBStreamInsertRequest) {
              getStreamBulkWriteProcessor().add(((BanyanDBStreamInsertRequest) insertRequest).getStreamWrite());
          } else if (insertRequest instanceof BanyanDBMeasureInsertRequest) {
              getMeasureBulkWriteProcessor().add(((BanyanDBMeasureInsertRequest) insertRequest).getMeasureWrite());
          }
      }
  
      @Override
      public CompletableFuture<Void> flush(List<PrepareRequest> prepareRequests) {
          if (CollectionUtils.isNotEmpty(prepareRequests)) {
              return CompletableFuture.allOf(prepareRequests.stream().map((Function<PrepareRequest, CompletableFuture<Void>>) r -> {
                  if (r instanceof BanyanDBStreamInsertRequest) {
                      return getStreamBulkWriteProcessor().add(((BanyanDBStreamInsertRequest) r).getStreamWrite());
                  } else if (r instanceof BanyanDBMeasureInsertRequest) {
                      return getMeasureBulkWriteProcessor().add(((BanyanDBMeasureInsertRequest) r).getMeasureWrite())
                                                           .whenComplete((v, throwable) -> {
                                                               if (throwable == null) {
                                                                   // Insert completed
                                                                   ((BanyanDBMeasureInsertRequest) r).onInsertCompleted();
                                                               }
                                                           });
                  } else if (r instanceof BanyanDBMeasureUpdateRequest) {
                      return getMeasureBulkWriteProcessor().add(((BanyanDBMeasureUpdateRequest) r).getMeasureWrite());
                  }
                  return CompletableFuture.completedFuture(null);
              }).toArray(CompletableFuture[]::new));
          }
  
          return CompletableFuture.completedFuture(null);
      }
  
      private StreamBulkWriteProcessor getStreamBulkWriteProcessor() {
          if (streamBulkWriteProcessor == null) {
              synchronized (STREAM_SYNCHRONIZER) {
                  if (streamBulkWriteProcessor == null) {
                      this.streamBulkWriteProcessor = getClient().createStreamBulkProcessor(maxBulkSize, flushInterval, concurrency);
                  }
              }
          }
          return streamBulkWriteProcessor;
      }
  
      private MeasureBulkWriteProcessor getMeasureBulkWriteProcessor() {
          if (measureBulkWriteProcessor == null) {
              synchronized (MEASURE_SYNCHRONIZER) {
                  if (measureBulkWriteProcessor == null) {
                      this.measureBulkWriteProcessor = getClient().createMeasureBulkProcessor(maxBulkSize, flushInterval, concurrency);
                  }
              }
          }
          return measureBulkWriteProcessor;
      }
  }
  