MBeanDumper.java
/*
* 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.catalina.mbeans;
import java.lang.reflect.Array;
import java.util.Set;
import java.util.StringJoiner;
import javax.management.JMRuntimeException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanInfo;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.openmbean.CompositeData;
import javax.management.openmbean.TabularData;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
import org.apache.tomcat.util.ExceptionUtils;
import org.apache.tomcat.util.res.StringManager;
/**
* General helper to dump MBean contents to the log.
*/
public class MBeanDumper {
private static final Log log = LogFactory.getLog(MBeanDumper.class);
protected static final StringManager sm = StringManager.getManager(MBeanDumper.class);
private static final String CRLF = "\r\n";
/**
* The following code to dump MBeans has been copied from JMXProxyServlet.
*
* @param mbeanServer the MBean server
* @param names a set of object names for which to dump the info
*
* @return a string representation of the MBeans
*/
public static String dumpBeans(MBeanServer mbeanServer, Set<ObjectName> names) {
StringBuilder buf = new StringBuilder();
for (ObjectName oname : names) {
buf.append("Name: ");
buf.append(oname.toString());
buf.append(CRLF);
try {
MBeanInfo minfo = mbeanServer.getMBeanInfo(oname);
// can't be null - I think
String code = minfo.getClassName();
if ("org.apache.commons.modeler.BaseModelMBean".equals(code)) {
code = (String) mbeanServer.getAttribute(oname, "modelerType");
}
buf.append("modelerType: ");
buf.append(code);
buf.append(CRLF);
MBeanAttributeInfo attrs[] = minfo.getAttributes();
Object value = null;
for (MBeanAttributeInfo attr : attrs) {
if (!attr.isReadable()) {
continue;
}
String attName = attr.getName();
if ("modelerType".equals(attName)) {
continue;
}
if (attName.indexOf('=') >= 0 || attName.indexOf(':') >= 0 || attName.indexOf(' ') >= 0) {
continue;
}
try {
value = mbeanServer.getAttribute(oname, attName);
} catch (JMRuntimeException rme) {
Throwable cause = rme.getCause();
if (cause instanceof UnsupportedOperationException) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("mBeanDumper.getAttributeError", attName, oname), rme);
}
} else if (cause instanceof NullPointerException) {
if (log.isDebugEnabled()) {
log.debug(sm.getString("mBeanDumper.getAttributeError", attName, oname), rme);
}
} else {
log.error(sm.getString("mBeanDumper.getAttributeError", attName, oname), rme);
}
continue;
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
log.error(sm.getString("mBeanDumper.getAttributeError", attName, oname), t);
continue;
}
if (value == null) {
continue;
}
String valueString;
try {
Class<?> c = value.getClass();
if (c.isArray()) {
int len = Array.getLength(value);
StringBuilder sb =
new StringBuilder("Array[" + c.getComponentType().getName() + "] of length " + len);
if (len > 0) {
sb.append(CRLF);
}
for (int j = 0; j < len; j++) {
Object item = Array.get(value, j);
sb.append(tableItemToString(item));
if (j < len - 1) {
sb.append(CRLF);
}
}
valueString = sb.toString();
} else if (TabularData.class.isInstance(value)) {
TabularData tab = TabularData.class.cast(value);
StringJoiner joiner = new StringJoiner(CRLF);
joiner.add("TabularData[" + tab.getTabularType().getRowType().getTypeName() +
"] of length " + tab.size());
for (Object item : tab.values()) {
joiner.add(tableItemToString(item));
}
valueString = joiner.toString();
} else {
valueString = valueToString(value);
}
buf.append(attName);
buf.append(": ");
buf.append(valueString);
buf.append(CRLF);
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
}
}
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
}
buf.append(CRLF);
}
return buf.toString();
}
public static String escape(String value) {
// The only invalid char is \n
// We also need to keep the string short and split it with \nSPACE
// XXX TODO
int idx = value.indexOf('\n');
if (idx < 0) {
return value;
}
int prev = 0;
StringBuilder sb = new StringBuilder();
while (idx >= 0) {
appendHead(sb, value, prev, idx);
sb.append("\\n\n ");
prev = idx + 1;
if (idx == value.length() - 1) {
break;
}
idx = value.indexOf('\n', idx + 1);
}
if (prev < value.length()) {
appendHead(sb, value, prev, value.length());
}
return sb.toString();
}
private static void appendHead(StringBuilder sb, String value, int start, int end) {
if (end < 1) {
return;
}
int pos = start;
while (end - pos > 78) {
sb.append(value.substring(pos, pos + 78));
sb.append("\n ");
pos = pos + 78;
}
sb.append(value.substring(pos, end));
}
private static String tableItemToString(Object item) {
if (item == null) {
return "\t" + "NULL VALUE";
} else {
try {
return "\t" + valueToString(item);
} catch (Throwable t) {
ExceptionUtils.handleThrowable(t);
return "\t" + "NON-STRINGABLE VALUE";
}
}
}
private static String valueToString(Object value) {
String valueString;
if (CompositeData.class.isInstance(value)) {
StringBuilder sb = new StringBuilder("{");
String sep = "";
CompositeData composite = CompositeData.class.cast(value);
Set<String> keys = composite.getCompositeType().keySet();
for (String key : keys) {
sb.append(sep).append(key).append('=').append(composite.get(key));
sep = ", ";
}
sb.append('}');
valueString = sb.toString();
} else {
valueString = value.toString();
}
return escape(valueString);
}
}