本文整理汇总了Java中javax.management.AttributeList.isEmpty方法的典型用法代码示例。如果您正苦于以下问题：Java AttributeList.isEmpty方法的具体用法？Java AttributeList.isEmpty怎么用？Java AttributeList.isEmpty使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类javax.management.AttributeList的用法示例。
在下文中一共展示了AttributeList.isEmpty方法的6个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: getProcessCpuLoad
import javax.management.AttributeList; //导入方法依赖的package包/类
public static double getProcessCpuLoad() throws Exception {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
AttributeList list = mbs.getAttributes(name, new String[] { "SystemCpuLoad" });
if (list.isEmpty())
return Double.NaN;
Attribute att = (Attribute) list.get(0);
Double value = (Double) att.getValue();
// usually takes a couple of seconds before we get real values
if (value == -1.0)
return Double.NaN;
// returns a percentage value with 1 decimal point precision
return value;
}
示例2: getCpuLoad
import javax.management.AttributeList; //导入方法依赖的package包/类
/**
* Get CPU Load of Host System
*
* @author http://stackoverflow.com/questions/18489273/how-to-get-percentage-of-cpu-usage-of-os-from-java
*/
private double getCpuLoad() {
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
AttributeList list = mbs.getAttributes(name, new String[]{"ProcessCpuLoad"});
if (list.isEmpty())
return Double.NaN;
Attribute att = (Attribute) list.get(0);
Double value = (Double) att.getValue();
// usually takes a couple of seconds before we get real values
if (value == -1.0)
return Double.NaN;
// returns a percentage value with 1 decimal point precision
return ((int) (value * 1000) / 10.0);
} catch (Exception e) {
return Double.NaN;
}
}
示例3: getProcessCpuLoad
import javax.management.AttributeList; //导入方法依赖的package包/类
public static double getProcessCpuLoad() {
double cpuLoad;
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
AttributeList list = mbs.getAttributes(name, new String[] { "ProcessCpuLoad" });
if(list.isEmpty()) {
return Double.NaN;
}
Attribute att = (Attribute) list.get(0);
Double value = (Double) att.getValue();
if(value == -1.0) {
return Double.NaN;
}
cpuLoad = value * 100d;
} catch (InstanceNotFoundException | ReflectionException | MalformedObjectNameException err) {
cpuLoad = Double.NaN;
}
return cpuLoad;
}
示例4: getCpuLoad
import javax.management.AttributeList; //导入方法依赖的package包/类
private static double getCpuLoad() {
// http://stackoverflow.com/questions/18489273/how-to-get-percentage-of-cpu-usage-of-os-from-java
try {
MBeanServer mbs = ManagementFactory.getPlatformMBeanServer();
ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
AttributeList list = mbs.getAttributes(name, new String[]{ "ProcessCpuLoad" });
if (list.isEmpty())
return Double.NaN;
Attribute att = (Attribute)list.get(0);
Double value = (Double)att.getValue();
// usually takes a couple of seconds before we get real values
if (value == -1.0)
return Double.NaN;
// returns a percentage value with 1 decimal point precision
return ((int)(value * 1000) / 10.0);
} catch(Exception e) {
return Double.NaN;
}
}
示例5: getProcessCpuLoad
import javax.management.AttributeList; //导入方法依赖的package包/类
public static double getProcessCpuLoad(MBeanServerConnection mbs)
throws MalformedObjectNameException, NullPointerException, InstanceNotFoundException,
ReflectionException, IOException {
ObjectName name = ObjectName.getInstance("java.lang:type=OperatingSystem");
AttributeList list = mbs.getAttributes(name, new String[]{"ProcessCpuLoad"});
if (list.isEmpty()) {
return 0.0;
}
Attribute att = (Attribute) list.get(0);
Double value = (Double) att.getValue();
// usually takes a couple of seconds before we get real values
if (value == -1.0) {
return 0.0;
}
// returns a percentage value with 1 decimal point precision
return ((int) (value * 1000) / 10.0);
}
示例6: setAttributes
import javax.management.AttributeList; //导入方法依赖的package包/类
public AttributeList setAttributes(AttributeList attributes)
{
// Check attributes is not null to avoid NullPointerException later on
//
if (attributes != null)
{
AttributeList resultList = new AttributeList();
// If attributeNames is empty, nothing more to do
//
if (attributes.isEmpty())
return resultList;
// For each attribute, try to set it and add to the result list if
// successfull
//
for (Iterator i = attributes.iterator(); i.hasNext();)
{
Attribute attr = (Attribute) i.next();
try
{
setAttribute(attr);
String name = attr.getName();
Object value = getAttribute(name);
resultList.add(new Attribute(name,value));
}
catch(Exception e)
{
e.printStackTrace();
}
}
return resultList;
}
return null;
}