| /* |
| * Copyright 2015-present Open Networking Foundation |
| * |
| * 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 org.onlab.util; |
| |
| import java.util.List; |
| |
| /** |
| * Abstraction of an accumulator capable of collecting items and at some |
| * point in time triggers processing of all previously accumulated items. |
| * |
| * @param <T> item type |
| */ |
| public interface Accumulator<T> { |
| |
| /** |
| * Adds an item to the current batch. This operation may, or may not |
| * trigger processing of the current batch of items. |
| * |
| * @param item item to be added to the current batch |
| */ |
| void add(T item); |
| |
| /** |
| * Processes the specified list of accumulated items. |
| * |
| * @param items list of accumulated items |
| */ |
| void processItems(List<T> items); |
| |
| /** |
| * Indicates whether the accumulator is ready to process items. |
| * |
| * @return true if ready to process |
| */ |
| boolean isReady(); |
| } |