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// Copyright (C) 2017 The Android Open Source Project
//
// Licensed 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 com.google.gerrit.metrics.proc;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.Method;
import java.util.Arrays;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
class OperatingSystemMXBeanProvider {
private static final Logger log = LoggerFactory.getLogger(OperatingSystemMXBeanProvider.class);
private final OperatingSystemMXBean sys;
private final Method getProcessCpuTime;
private final Method getOpenFileDescriptorCount;
static class Factory {
static OperatingSystemMXBeanProvider create() {
OperatingSystemMXBean sys = ManagementFactory.getOperatingSystemMXBean();
for (String name :
Arrays.asList(
"com.sun.management.UnixOperatingSystemMXBean",
"com.ibm.lang.management.UnixOperatingSystemMXBean")) {
try {
Class<?> impl = Class.forName(name);
if (impl.isInstance(sys)) {
return new OperatingSystemMXBeanProvider(sys);
}
} catch (ReflectiveOperationException e) {
log.debug("No implementation for {}", name, e);
}
}
log.warn("No implementation of UnixOperatingSystemMXBean found");
return null;
}
}
private OperatingSystemMXBeanProvider(OperatingSystemMXBean sys)
throws ReflectiveOperationException {
this.sys = sys;
getProcessCpuTime = sys.getClass().getMethod("getProcessCpuTime", new Class<?>[] {});
getProcessCpuTime.setAccessible(true);
getOpenFileDescriptorCount =
sys.getClass().getMethod("getOpenFileDescriptorCount", new Class<?>[] {});
getOpenFileDescriptorCount.setAccessible(true);
}
public long getProcessCpuTime() {
try {
return (long) getProcessCpuTime.invoke(sys, new Object[] {});
} catch (ReflectiveOperationException e) {
return -1;
}
}
public long getOpenFileDescriptorCount() {
try {
return (long) getOpenFileDescriptorCount.invoke(sys, new Object[] {});
} catch (ReflectiveOperationException e) {
return -1;
}
}
}
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