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.jmx.api.attribute;
  
  import org.jetbrains.annotations.Nullable;
  
  import java.util.List;
  
  /**
   * Reduces input list to single value.
   * <p>
   * It's highly recommended for implementations of this interface to be stateless or immutable
   * (namely have immutable state after creation)
   *
   * @param <T> a type of objects to be reduced
   */
  public interface JmxReducer<T> {
  	@Nullable T reduce(List<? extends T> list);
  }
  