| /** |
| * 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.utils; |
| |
| public class WindowedTimeThrottler { |
| long windowMillis; |
| int maxAmt; |
| long windowStartTime; |
| int windowEvents = 0; |
| |
| public WindowedTimeThrottler(Number windowMillis, Number maxAmt) { |
| this.windowMillis = windowMillis.longValue(); |
| this.maxAmt = maxAmt.intValue(); |
| windowStartTime = System.currentTimeMillis(); |
| } |
| |
| public boolean isThrottled() { |
| resetIfNecessary(); |
| return windowEvents >= maxAmt; |
| } |
| |
| //returns void if the event should continue, false if the event should not be done |
| public void markEvent() { |
| resetIfNecessary(); |
| windowEvents++; |
| |
| } |
| |
| private void resetIfNecessary() { |
| long now = System.currentTimeMillis(); |
| if (now - windowStartTime > windowMillis) { |
| windowStartTime = now; |
| windowEvents = 0; |
| } |
| } |
| } |