| /** |
| * Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. The ASF licenses this file to you 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.apache.storm.windowing; |
| |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.function.Supplier; |
| |
| /** |
| * A callback for expiry, activation of events tracked by the {@link WindowManager}. |
| * |
| * @param <T> The type of Event in the window (e.g. Tuple). |
| */ |
| public interface WindowLifecycleListener<T> { |
| /** |
| * Called on expiry of events from the window due to {@link EvictionPolicy}. |
| * |
| * @param events the expired events |
| */ |
| void onExpiry(List<T> events); |
| |
| /** |
| * Called on activation of the window due to the {@link TriggerPolicy}. |
| * |
| * @param events the list of current events in the window. |
| * @param newEvents the newly added events since last activation. |
| * @param expired the expired events since last activation. |
| * @param referenceTime the reference (event or processing) time that resulted in activation |
| */ |
| default void onActivation(List<T> events, List<T> newEvents, List<T> expired, Long referenceTime) { |
| throw new UnsupportedOperationException("Not implemented"); |
| } |
| |
| /** |
| * Called on activation of the window due to the {@link TriggerPolicy}. This is typically invoked when the windows are persisted in |
| * state and is huge to be loaded entirely in memory. |
| * |
| * @param eventsIt a supplier of iterator over the list of current events in the window |
| * @param newEventsIt a supplier of iterator over the newly added events since the last ativation |
| * @param expiredIt a supplier of iterator over the expired events since the last activation |
| * @param referenceTime the reference (event or processing) time that resulted in activation |
| */ |
| default void onActivation(Supplier<Iterator<T>> eventsIt, Supplier<Iterator<T>> newEventsIt, Supplier<Iterator<T>> expiredIt, |
| Long referenceTime) { |
| throw new UnsupportedOperationException("Not implemented"); |
| } |
| } |