/*
* Copyright 2015 Terracotta, Inc., a Software AG company.
*
* 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 org.terracotta.offheapstore.util;
import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.InvocationTargetException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
* @author cdennis
*/
public class PhysicalMemory {
private static final Logger LOGGER = LoggerFactory.getLogger(PhysicalMemory.class);
private static final OperatingSystemMXBean OS_BEAN = ManagementFactory.getOperatingSystemMXBean();
public static Long totalPhysicalMemory() {
return getAttribute("getTotalPhysicalMemorySize");
}
public static Long freePhysicalMemory() {
return getAttribute("getFreePhysicalMemorySize");
}
public static Long totalSwapSpace() {
return getAttribute("getTotalSwapSpaceSize");
}
public static Long freeSwapSpace() {
return getAttribute("getFreeSwapSpaceSize");
}
public static Long ourCommittedVirtualMemory() {
return getAttribute("getCommittedVirtualMemorySize");
}
private static <T> T getAttribute(String name) {
LOGGER.trace("Bean lookup for {}", name);
for (Class<?> s = OS_BEAN.getClass(); s != null; s = s.getSuperclass()) {
try {
T result = (T) s.getMethod(name).invoke(OS_BEAN);
LOGGER.trace("Bean lookup successful using {}, got {}", s, result);
return result;
} catch (SecurityException e) {
LOGGER.trace("Bean lookup failed on {}", s, e);
} catch (NoSuchMethodException e) {
LOGGER.trace("Bean lookup failed on {}", s, e);
} catch (IllegalAccessException e) {
LOGGER.trace("Bean lookup failed on {}", s, e);
} catch (IllegalArgumentException e) {
LOGGER.trace("Bean lookup failed on {}", s, e);
} catch (InvocationTargetException e) {
LOGGER.trace("Bean lookup failed on {}", s, e);
}
}
for (Class<?> i : OS_BEAN.getClass().getInterfaces()) {
try {
T result = (T) i.getMethod(name).invoke(OS_BEAN);
LOGGER.trace("Bean lookup successful using {}, got {}", i, result);
return result;
} catch (SecurityException e) {
LOGGER.trace("Bean lookup failed on {}", i, e);
} catch (NoSuchMethodException e) {
LOGGER.trace("Bean lookup failed on {}", i, e);
} catch (IllegalAccessException e) {
LOGGER.trace("Bean lookup failed on {}", i, e);
} catch (IllegalArgumentException e) {
LOGGER.trace("Bean lookup failed on {}", i, e);
} catch (InvocationTargetException e) {
LOGGER.trace("Bean lookup failed on {}", i, e);
}
}
LOGGER.trace("Returning null for {}", name);
return null;
}
public static void main(String[] args) {
System.out.println("Total Physical Memory: " + DebuggingUtils.toBase2SuffixedString(totalPhysicalMemory()) + "B");
System.out.println("Free Physical Memory: " + DebuggingUtils.toBase2SuffixedString(freePhysicalMemory()) + "B");
System.out.println("Total Swap Space: " + DebuggingUtils.toBase2SuffixedString(totalSwapSpace()) + "B");
System.out.println("Free Swap Space: " + DebuggingUtils.toBase2SuffixedString(freeSwapSpace()) + "B");
System.out.println("Committed Virtual Memory: " + DebuggingUtils.toBase2SuffixedString(ourCommittedVirtualMemory()) + "B");
}
}