content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * Licensed 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 io.activej.cube.aggregation;
  
  import io.activej.codegen.DefiningClassLoader;
  import io.activej.common.annotation.ComponentInterface;
  import io.activej.cube.AggregationStructure;
  import io.activej.datastream.consumer.StreamConsumer;
  import io.activej.datastream.supplier.StreamSupplier;
  import io.activej.promise.Promise;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  
  /**
   * Manages persistence of aggregations (chunks of data).
   */
  @ComponentInterface
  public interface IAggregationChunkStorage {
  	Promise<String> createProtoChunkId();
  
  	/**
  	 * Creates a {@code StreamSupplier} that streams records contained in the chunk.
  	 * The chunk to read is determined by {@code aggregationId} and {@code id}.
  	 *
  	 * @param recordClass class of chunk record
  	 * @param chunkId     id of chunk
  	 * @return StreamSupplier, which will stream read records to its wired consumer.
  	 */
  	<T> Promise<StreamSupplier<T>> read(
  		AggregationStructure aggregation, List<String> fields, Class<T> recordClass, long chunkId,
  		DefiningClassLoader classLoader
  	);
  
  	/**
  	 * Creates a {@code StreamConsumer} that persists streamed records.
  	 * The chunk to write is determined by {@code aggregationId} and {@code id}.
  	 *
  	 * @param fields       fields of chunk record
  	 * @param recordClass  class of chunk record
  	 * @param protoChunkId proto id of chunk
  	 */
  	<T> Promise<StreamConsumer<T>> write(
  		AggregationStructure aggregation, List<String> fields, Class<T> recordClass, String protoChunkId,
  		DefiningClassLoader classLoader
  	);
  
  	Promise<Map<String, Long>> finish(Set<String> protoChunkIds);
  
  	Promise<Set<Long>> listChunks();
  
  	Promise<Void> deleteChunks(Set<Long> chunksToDelete);
  
  }
  
  
  