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/*
* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package nsk.monitoring.share;
import java.lang.management.*;
import javax.management.*;
import java.util.*;
import nsk.share.*;
/**
* <code>ClassLoadingMonitor</code> class is a wrapper of
* <code>ClassLoadingMXBean</code>. Depending on command line arguments, an
* instance of this class redirects invocations to the
* <code>ClassLoadingMXBean</code> interface. If
* <code>-testMode="directly"</code> option is set, this instance directly
* invokes corresponding method of the <tt>ClassLoadingMXBean</tt> interface. If
* <code>-testMode="server"</code> option is set, it makes invokations via
* MBeanServer. If <code>-testMode="proxy"</code> option is set it will make
* invocations via MBeanServer proxy.
*
* @see ArgumentHandler
*/
public class ClassLoadingMonitor extends Monitor {
// Names of the attributes of ClassLoadingMXBean
private static final String LOADED_CLASSES = "LoadedClassCount";
private static final String TOTAL_CLASSES = "TotalLoadedClassCount";
private static final String UNLOADED_CLASSES = "UnloadedClassCount";
// Internal trace level
private static final int TRACE_LEVEL = 10;
// An instance of ClassLoadingMXBean
private static ClassLoadingMXBean mbean
= ManagementFactory.getClassLoadingMXBean();
private ClassLoadingMXBean proxyInstance;
static {
Monitor.logPrefix = "ClassLoadingMonitor> ";
}
/**
* Creates a new <code>ClassLoadingMonitor</code> object.
*
* @param log <code>Log</code> object to print info to.
* @param argumentHandler <code>ArgumentHandler</code> object that saves
* all info about test's arguments.
*
*/
public ClassLoadingMonitor(Log log, ArgumentHandler argumentHandler) {
super(log, argumentHandler);
}
/**
*
* Return a proxy instance for a platform
* {@link java.lang.management.ClassLoadingMXBean
* <code>ClassLoadingMXBean</code>} interface.
*
*/
synchronized ClassLoadingMXBean getProxy() {
if (proxyInstance == null) {
// create proxy instance
try {
proxyInstance = (ClassLoadingMXBean)
ManagementFactory.newPlatformMXBeanProxy(
getMBeanServer(),
ManagementFactory.CLASS_LOADING_MXBEAN_NAME,
ClassLoadingMXBean.class
);
} catch (java.io.IOException e) {
throw new Failure(e);
}
}
return proxyInstance;
}
/**
* Redirects the invocation to
* {@link java.lang.management.ClassLoadingMXBean#getLoadedClassCount()
* <code>ClassLoadingMXBean.getLoadedClassCount()</code>}.
*
* @return the number of currently loaded classes.
*/
public int getLoadedClassCount() {
int mode = getTestMode();
switch (mode) {
case DIRECTLY_MODE:
logger.trace(TRACE_LEVEL,"[getLoadedClassCount] "
+ "getLoadedClassCount() directly invoked");
return mbean.getLoadedClassCount();
case SERVER_MODE:
logger.trace(TRACE_LEVEL,"[getLoadedClassCount] "
+ "getLoadedClassCount() invoked through MBeanServer");
return getIntAttribute(mbeanObjectName, LOADED_CLASSES);
case PROXY_MODE:
logger.trace(TRACE_LEVEL,"[getLoadedClassCount] "
+ "getLoadedClassCount() invoked through proxy");
return getProxy().getLoadedClassCount();
}
throw new TestBug("Unknown testMode " + mode);
}
/**
* Redirects the invocation to {@link
* java.lang.management.ClassLoadingMXBean#getTotalLoadedClassCount()
* <code>ClassLoadingMXBean.getTotalLoadedClassCount()</code>}.
*
* @return the total number of classes loaded.
*/
public long getTotalLoadedClassCount() {
int mode = getTestMode();
switch (mode) {
case DIRECTLY_MODE:
logger.trace(TRACE_LEVEL,"[getTotalLoadedClassCount] "
+ "getTotalLoadedClassCount() directly invoked");
return mbean.getTotalLoadedClassCount();
case SERVER_MODE:
logger.trace(TRACE_LEVEL,"[getTotalLoadedClassCount] "
+ "getTotalLoadedClassCount() invoked through "
+ "MBeanServer");
return getLongAttribute(mbeanObjectName, TOTAL_CLASSES);
case PROXY_MODE:
logger.trace(TRACE_LEVEL,"[getTotalLoadedClassCount] "
+ "getTotalLoadedClassCount() invoked through proxy");
return getProxy().getTotalLoadedClassCount();
}
throw new TestBug("Unknown testMode " + mode);
}
/**
* Redirects the invocation to
* {@link java.lang.management.ClassLoadingMXBean#getUnloadedClassCount()
* <code>ClassLoadingMXBean.getUnloadedClassCount()</code>}.
*
* @return the number of unloaded classes.
*/
public long getUnloadedClassCount() {
int mode = getTestMode();
switch (mode) {
case DIRECTLY_MODE:
logger.trace(TRACE_LEVEL,"[getUnloadedClassCount] "
+ "getUnloadedClassCount() directly invoked");
return mbean.getUnloadedClassCount();
case SERVER_MODE:
logger.trace(TRACE_LEVEL,"[getUnloadedClassCount] "
+ "getUnloadedClassCount() invoked through MBeanServer");
return getLongAttribute(mbeanObjectName, UNLOADED_CLASSES);
case PROXY_MODE:
logger.trace(TRACE_LEVEL,"[getUnloadedClassCount] "
+ "getUnloadedClassCount() invoked through proxy");
return getProxy().getUnloadedClassCount();
}
throw new TestBug("Unknown testMode " + mode);
}
} // ClassLoadingMonitor
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