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.ot;
  
  import io.activej.promise.Promise;
  
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.function.Function;
  import java.util.function.ToLongFunction;
  
  import static io.activej.common.collection.CollectorUtils.toLinkedHashMap;
  
  public interface AsyncOTCommitFactory<K, D> {
  	record DiffsWithLevel<D>(long level, List<D> diffs) {
  	}
  
  	Promise<OTCommit<K, D>> createCommit(Map<K, DiffsWithLevel<D>> parentDiffs);
  
  	default Promise<OTCommit<K, D>> createCommit(K parent, DiffsWithLevel<D> parentDiff) {
  		return createCommit(Map.of(parent, parentDiff));
  	}
  
  	default Promise<OTCommit<K, D>> createCommit(Set<K> parents, Function<K, List<D>> diffs, ToLongFunction<K> level) {
  		return createCommit(parents.stream()
  			.collect(toLinkedHashMap(parent -> new DiffsWithLevel<>(level.applyAsLong(parent), diffs.apply(parent)))));
  	}
  
  	default Promise<OTCommit<K, D>> createCommit(K parent, List<D> diffs, long level) {
  		return createCommit(parent, new DiffsWithLevel<>(level, diffs));
  	}
  }
  