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// Copyright (C) 2019 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.OperatingSystemMXBean;
import java.lang.reflect.Method;
class OperatingSystemMXBeanReflectionBased implements OperatingSystemMXBeanInterface {
private final OperatingSystemMXBean sys;
private final Method getProcessCpuTime;
private final Method getOpenFileDescriptorCount;
OperatingSystemMXBeanReflectionBased(OperatingSystemMXBean sys)
throws ReflectiveOperationException {
this.sys = sys;
getProcessCpuTime = sys.getClass().getMethod("getProcessCpuTime");
getProcessCpuTime.setAccessible(true);
getOpenFileDescriptorCount = sys.getClass().getMethod("getOpenFileDescriptorCount");
getOpenFileDescriptorCount.setAccessible(true);
}
@Override
public long getProcessCpuTime() {
try {
return (long) getProcessCpuTime.invoke(sys, new Object[] {});
} catch (ReflectiveOperationException e) {
return -1;
}
}
@Override
public long getOpenFileDescriptorCount() {
try {
return (long) getOpenFileDescriptorCount.invoke(sys, new Object[] {});
} catch (ReflectiveOperationException e) {
return -1;
}
}
}