77 lines
2.7 KiB
Java
77 lines
2.7 KiB
Java
// Copyright (C) 2017 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package com.google.gerrit.metrics.proc;
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import com.google.common.flogger.FluentLogger;
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import java.lang.management.ManagementFactory;
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import java.lang.management.OperatingSystemMXBean;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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class OperatingSystemMXBeanProvider {
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private static final FluentLogger logger = FluentLogger.forEnclosingClass();
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private final OperatingSystemMXBean sys;
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private final Method getProcessCpuTime;
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private final Method getOpenFileDescriptorCount;
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static class Factory {
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static OperatingSystemMXBeanProvider create() {
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OperatingSystemMXBean sys = ManagementFactory.getOperatingSystemMXBean();
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for (String name :
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Arrays.asList(
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"com.sun.management.UnixOperatingSystemMXBean",
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"com.ibm.lang.management.UnixOperatingSystemMXBean")) {
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try {
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Class<?> impl = Class.forName(name);
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if (impl.isInstance(sys)) {
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return new OperatingSystemMXBeanProvider(sys);
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}
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} catch (ReflectiveOperationException e) {
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logger.atFine().withCause(e).log("No implementation for %s", name);
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}
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}
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logger.atWarning().log("No implementation of UnixOperatingSystemMXBean found");
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return null;
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}
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}
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private OperatingSystemMXBeanProvider(OperatingSystemMXBean sys)
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throws ReflectiveOperationException {
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this.sys = sys;
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getProcessCpuTime = sys.getClass().getMethod("getProcessCpuTime", new Class<?>[] {});
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getProcessCpuTime.setAccessible(true);
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getOpenFileDescriptorCount =
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sys.getClass().getMethod("getOpenFileDescriptorCount", new Class<?>[] {});
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getOpenFileDescriptorCount.setAccessible(true);
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}
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public long getProcessCpuTime() {
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try {
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return (long) getProcessCpuTime.invoke(sys, new Object[] {});
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} catch (ReflectiveOperationException e) {
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return -1;
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}
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}
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public long getOpenFileDescriptorCount() {
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try {
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return (long) getOpenFileDescriptorCount.invoke(sys, new Object[] {});
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} catch (ReflectiveOperationException e) {
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return -1;
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}
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}
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}
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