| /* |
| * 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.hyracks.util; |
| |
| import java.lang.management.GarbageCollectorMXBean; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryMXBean; |
| import java.lang.management.OperatingSystemMXBean; |
| import java.lang.management.RuntimeMXBean; |
| import java.lang.management.ThreadMXBean; |
| import java.lang.reflect.Method; |
| import java.util.Collections; |
| import java.util.List; |
| |
| import org.apache.commons.lang3.SystemUtils; |
| import org.apache.logging.log4j.Level; |
| import org.apache.logging.log4j.LogManager; |
| import org.apache.logging.log4j.Logger; |
| |
| public class MXHelper { |
| private static final Logger LOGGER = LogManager.getLogger(); |
| public static final MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean(); |
| public static final List<GarbageCollectorMXBean> gcMXBeans = |
| Collections.unmodifiableList(ManagementFactory.getGarbageCollectorMXBeans()); |
| public static final ThreadMXBean threadMXBean = ManagementFactory.getThreadMXBean(); |
| public static final RuntimeMXBean runtimeMXBean = ManagementFactory.getRuntimeMXBean(); |
| public static final OperatingSystemMXBean osMXBean = ManagementFactory.getOperatingSystemMXBean(); |
| private static Method getOpenFileDescriptorCount; |
| private static Method getMaxFileDescriptorCount; |
| |
| static { |
| if (SystemUtils.IS_OS_WINDOWS) { |
| LOGGER.info("Access to file descriptors (FDs) is not available on Windows; FD info will not be logged"); |
| } else { |
| Class<? extends OperatingSystemMXBean> osMXBeanClass = osMXBean.getClass(); |
| try { |
| getOpenFileDescriptorCount = osMXBeanClass.getMethod("getOpenFileDescriptorCount"); |
| getMaxFileDescriptorCount = osMXBeanClass.getDeclaredMethod("getMaxFileDescriptorCount"); |
| getOpenFileDescriptorCount.setAccessible(true); |
| getMaxFileDescriptorCount.setAccessible(true); |
| } catch (Throwable th) { // NOSONAR: diagnostic code shouldn't cause server failure |
| getOpenFileDescriptorCount = null; |
| getMaxFileDescriptorCount = null; |
| LOGGER.warn("Failed setting up the methods to get the number of file descriptors through {}", |
| osMXBeanClass.getName(), th); |
| } |
| } |
| } |
| |
| private MXHelper() { |
| } |
| |
| public static boolean supportOpenFileCount() { |
| return getOpenFileDescriptorCount != null; |
| } |
| |
| public static long getCurrentOpenFileCount() { |
| if (getOpenFileDescriptorCount == null) { |
| return -1; |
| } |
| try { |
| return (long) getOpenFileDescriptorCount.invoke(osMXBean); |
| } catch (Throwable e) { // NOSONAR |
| LOGGER.log(Level.WARN, "Failure invoking getOpenFileDescriptorCount", e); |
| return -1; |
| } |
| } |
| |
| public static long getMaxOpenFileCount() { |
| if (getMaxFileDescriptorCount == null) { |
| return -1; |
| } |
| try { |
| return (long) getMaxFileDescriptorCount.invoke(osMXBean); |
| } catch (Throwable e) { // NOSONAR |
| LOGGER.log(Level.WARN, "Failure invoking getMaxFileDescriptorCount", e); |
| return -1; |
| } |
| } |
| |
| public static void logFileDescriptors() { |
| try { |
| if (supportOpenFileCount()) { |
| LOGGER.log(Level.WARN, |
| "Number of open files by this process is {}. Max number of allowed open files is {} ", |
| MXHelper::getCurrentOpenFileCount, MXHelper::getMaxOpenFileCount); |
| } |
| } catch (Throwable th) { // NOSONAR: diagnostic code shouldn't cause server failure |
| LOGGER.log(Level.WARN, "Failed getting the count of open files", th); |
| } |
| } |
| |
| public static String getBootClassPath() { |
| try { |
| return runtimeMXBean.getBootClassPath(); |
| } catch (UnsupportedOperationException e) { |
| // boot classpath is not supported in Java 9 and later |
| LOGGER.debug("ignoring exception calling RuntimeMXBean.getBootClassPath; returning null", e); |
| return null; |
| } |
| } |
| } |