/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.sirona.gauges.jmx;
import org.apache.sirona.Role;
import org.apache.sirona.SironaException;
import org.apache.sirona.counters.Unit;
import org.apache.sirona.gauges.Gauge;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import java.lang.management.ManagementFactory;
public abstract class JMXAttributeGaugeBase implements Gauge {
private static final MBeanServer SERVER = ManagementFactory.getPlatformMBeanServer();
private final ObjectName name;
private final String attribute;
private final Role role;
public JMXAttributeGaugeBase(final ObjectName name, final String attribute, final String role, final Unit unit) {
this.name = name;
this.attribute = attribute;
this.role = new Role(role, unit);
}
public JMXAttributeGaugeBase(final ObjectName name, final String attribute) {
this(name, attribute, name.getCanonicalName() + "#" + attribute, Unit.UNARY);
}
@Override
public Role role() {
return role;
}
@Override
public double value() {
try {
return Number.class.cast(SERVER.getAttribute(name, attribute)).doubleValue();
} catch (final Exception e) {
throw new SironaException(e);
}
}
}