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/*
* Copyright 2015 Open Networking Laboratory
*
* 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();
}
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