| /* |
| * 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.cassandra.utils; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.sun.jna.LastErrorException; |
| import com.sun.jna.Native; |
| |
| public final class WindowsTimer |
| { |
| private static final Logger logger = LoggerFactory.getLogger(WindowsTimer.class); |
| |
| static |
| { |
| try |
| { |
| Native.register("winmm"); |
| } |
| catch (NoClassDefFoundError e) |
| { |
| logger.warn("JNA not found. winmm.dll cannot be registered. Performance will be negatively impacted on this node."); |
| } |
| catch (Exception e) |
| { |
| logger.error("Failed to register winmm.dll. Performance will be negatively impacted on this node."); |
| } |
| } |
| |
| private static native int timeBeginPeriod(int period) throws LastErrorException; |
| private static native int timeEndPeriod(int period) throws LastErrorException; |
| |
| private WindowsTimer() {} |
| |
| public static void startTimerPeriod(int period) |
| { |
| if (period == 0) |
| return; |
| assert(period > 0); |
| if (timeBeginPeriod(period) != 0) |
| logger.warn("Failed to set timer to : " + period + ". Performance will be degraded."); |
| } |
| |
| public static void endTimerPeriod(int period) |
| { |
| if (period == 0) |
| return; |
| assert(period > 0); |
| if (timeEndPeriod(period) != 0) |
| logger.warn("Failed to end accelerated timer period. System timer will remain set to: " + period + " ms."); |
| } |
| } |