| // Copyright 2017 Twitter. All rights reserved. |
| // |
| // 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 com.twitter.heron.api.windowing; |
| |
| /** |
| * The callback fired by {@link TriggerPolicy} when the trigger |
| * condition is satisfied. |
| */ |
| public interface TriggerHandler { |
| /** |
| * The code to execute when the {@link TriggerPolicy} condition is satisfied. |
| * |
| * @return true if the window was evaluated with at least one event in the window, false otherwise |
| */ |
| boolean onTrigger(); |
| } |