/*
* Copyright 2015 Ben Manes. All Rights Reserved.
*
* 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.github.benmanes.caffeine.jcache.management;
import java.lang.management.ManagementFactory;
import javax.cache.Cache;
import javax.cache.CacheException;
import javax.management.InstanceAlreadyExistsException;
import javax.management.InstanceNotFoundException;
import javax.management.MBeanRegistrationException;
import javax.management.MBeanServer;
import javax.management.MalformedObjectNameException;
import javax.management.NotCompliantMBeanException;
import javax.management.ObjectName;
import com.github.benmanes.caffeine.jcache.CacheProxy;
/**
* Jmx cache utilities.
*
* @author ben.manes@gmail.com (Ben Manes)
*/
public final class JmxRegistration {
public enum MBeanType { Configuration, Statistics }
private JmxRegistration() {}
/**
* Registers the JMX management bean for the cache.
*
* @param cache the cache to register
* @param mxbean the management bean
* @param type the mxbean type
*/
public static void registerMXBean(Cache<?, ?> cache, Object mxbean, MBeanType type) {
ObjectName objectName = getObjectName(cache, type);
register(objectName, mxbean);
}
/**
* Unregisters the JMX management bean for the cache.
*
* @param cache the cache to unregister
* @param type the mxbean type
*/
public static void unregisterMXBean(CacheProxy<?, ?> cache, MBeanType type) {
ObjectName objectName = getObjectName(cache, type);
unregister(objectName);
}
/** Registers the management bean with the given object name. */
private static void register(ObjectName objectName, Object mbean) {
MBeanServer server = ManagementFactory.getPlatformMBeanServer();
try {
if (!server.isRegistered(objectName)) {
server.registerMBean(mbean, objectName);
}
} catch (InstanceAlreadyExistsException
| MBeanRegistrationException | NotCompliantMBeanException e) {
throw new CacheException("Error registering " + objectName, e);
}
}
/** Unregisters the management bean(s) with the given object name. */
private static void unregister(ObjectName objectName) {
MBeanServer server = ManagementFactory.getPlatformMBeanServer();
try {
for (ObjectName name : server.queryNames(objectName, null)) {
server.unregisterMBean(name);
}
} catch (MBeanRegistrationException | InstanceNotFoundException e) {
throw new CacheException("Error unregistering " + objectName, e);
}
}
/** Returns the object name of the management bean. */
private static ObjectName getObjectName(Cache<?, ?> cache, MBeanType type) {
String cacheManagerName = sanitize(cache.getCacheManager().getURI().toString());
String cacheName = sanitize(cache.getName());
try {
String name = String.format("javax.cache:type=Cache%s,CacheManager=%s,Cache=%s",
type, cacheManagerName, cacheName);
return new ObjectName(name);
} catch (MalformedObjectNameException e) {
String msg = String.format("Illegal ObjectName for cacheManager=[%s], cache=[%s]",
cacheManagerName, cacheName);
throw new CacheException(msg, e);
}
}
/** Returns a sanatized string for use as a management bean name. */
private static String sanitize(String name) {
return (name == null) ? "" : name.replaceAll(",|:|=|\n", ".");
}
}