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.crdt.wal;
  
  import io.activej.promise.Promise;
  
  import static io.activej.common.Checks.checkArgument;
  
  public final class WriteAheadLogAdapters {
  
  	public static <K extends Comparable<K>, S> IWriteAheadLog<K, S> flushOnUpdatesCount(IWriteAheadLog<K, S> original, int updatesCount) {
  		checkArgument(updatesCount > 0);
  
  		return new ForwardingWriteAheadLog<>(original) {
  			private int count;
  
  			@Override
  			public Promise<Void> put(K key, S value) {
  				return super.put(key, value)
  					.whenResult(v -> {if (++count == updatesCount) this.flush();});
  			}
  
  			@Override
  			public Promise<Void> flush() {
  				count = 0;
  				return super.flush();
  			}
  		};
  	}
  }
  