| /* |
| * 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; |
| |
| // TODO: Move to common module (concurrent package) |
| public interface RateLimiter { |
| |
| long RESET_PERIOD = 1000L; |
| |
| /** |
| * Acquires one permit from RateLimiter if it can be acquired immediately |
| * without delay. |
| */ |
| boolean tryAcquire(); |
| |
| /** |
| * Create a RateLimiter with specified rate, to keep compatible with |
| * Guava's RateLimiter (use double now) |
| * |
| * @param ratePerSecond the rate of the returned RateLimiter, measured in |
| * how many permits become available per second |
| * |
| * TODO: refactor it to make method unchangeable |
| */ |
| static RateLimiter create(double ratePerSecond) { |
| return new FixedTimerWindowRateLimiter((int) ratePerSecond); |
| } |
| } |
