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.multilog;
  
  import io.activej.common.annotation.ComponentInterface;
  import io.activej.datastream.consumer.StreamConsumer;
  import io.activej.datastream.supplier.StreamSupplierWithResult;
  import io.activej.promise.Promise;
  import org.jetbrains.annotations.Nullable;
  
  /**
   * Manages persistence of logs.
   */
  @ComponentInterface
  public interface IMultilog<T> {
  	/**
  	 * Creates a {@code StreamConsumer} that persists streamed log items to log.
  	 *
  	 * @param logPartition log partition name
  	 * @return StreamConsumer, which will write records, streamed from wired supplier.
  	 */
  	Promise<StreamConsumer<T>> write(String logPartition);
  
  	/**
  	 * Creates a {@code StreamSupplier} that streams items, contained in a given partition and file, starting at the specified position.
  	 *
  	 * @param logPartition  name of log partition
  	 * @param startLogFile  log file
  	 * @param startPosition position
  	 * @return StreamSupplier, which will stream read items to its wired consumer.
  	 */
  	Promise<StreamSupplierWithResult<T, LogPosition>> read(String logPartition,
  		LogFile startLogFile, long startPosition,
  		@Nullable LogFile endLogFile);
  
  }
  