| /* |
| * 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.hugegraph.util; |
| |
| import java.util.Timer; |
| import java.util.TimerTask; |
| import java.util.concurrent.atomic.LongAdder; |
| |
| /** |
| * This class is used for fixed window to limit request per second |
| * The different with stopwatch is to use timer for reducing count times |
| * |
| * TODO: Move to common module |
| */ |
| public class FixedTimerWindowRateLimiter implements RateLimiter { |
| |
| private final Timer timer; |
| private final LongAdder count; |
| private final int limit; |
| |
| public FixedTimerWindowRateLimiter(int limitPerSecond) { |
| this.timer = new Timer("RateAuditLog", true); |
| this.count = new LongAdder(); |
| this.limit = limitPerSecond; |
| // Count will be reset if hit limit (run once per 1000ms) |
| this.timer.schedule(new TimerTask() { |
| @Override |
| public void run() { |
| if (count.intValue() >= limit) { |
| count.reset(); |
| } |
| } |
| }, 0L, RESET_PERIOD); |
| } |
| |
| @Override |
| public boolean tryAcquire() { |
| if (count.intValue() >= limit) { |
| return false; |
| } |
| |
| count.increment(); |
| return true; |
| } |
| } |