| /** |
| * 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 backtype.storm.utils; |
| |
| public class WindowedTimeThrottler { |
| long _windowMillis; |
| int _maxAmt; |
| long _windowStartTime; |
| int _windowEvents = 0; |
| |
| public WindowedTimeThrottler(Number windowMillis, Number maxAmt) { |
| _windowMillis = windowMillis.longValue(); |
| _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; |
| } |
| } |
| } |