Non-instantiable class that provides jmx utility methods
// Copyright 2007 Google Inc.
//
// 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.
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.logging.Logger;
import javax.management.AttributeNotFoundException;
import javax.management.InstanceNotFoundException;
import javax.management.IntrospectionException;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanConstructorInfo;
import javax.management.MBeanException;
import javax.management.MBeanInfo;
import javax.management.MBeanNotificationInfo;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanServer;
import javax.management.ObjectName;
import javax.management.ReflectionException;
/**
* Non-instantiable class that provides jmx utility methods.
*/
public class Utilities {
/**
* Prints info about a bean to a {@link VarOutputSink}.
*
* @param sink The {@link VarOutputSink} to which info will be sent
* @param mbs The {@link MBeanServer} with respect to which the
* {@code objectName} is accessed
* @param objectName The {@link ObjectName} that identifies this bean
*/
public static void printMBeanInfo(VarOutputSink sink, MBeanServer mbs,
ObjectName objectName) {
MBeanInfo info = getMBeanInfoSafely(sink, mbs, objectName);
if (info == null) { return; }
sink.echo("\nCLASSNAME: \t" + info.getClassName());
sink.echo("\nDESCRIPTION: \t" + info.getDescription());
sink.echo("\nATTRIBUTES");
MBeanAttributeInfo[] attrInfo = info.getAttributes();
sink.printVariable("attrcount", Integer.toString(attrInfo.length));
if (attrInfo.length > 0) {
for (int i = 0; i < attrInfo.length; i++) {
sink.echo(" ** NAME: \t" + attrInfo[i].getName());
sink.echo(" DESCR: \t" + attrInfo[i].getDescription());
sink
.echo(" TYPE: \t" + attrInfo[i].getType() + "\tREAD: "
+ attrInfo[i].isReadable() + "\tWRITE: "
+ attrInfo[i].isWritable());
}
} else sink.echo(" ** No attributes **");
sink.echo("\nCONSTRUCTORS");
MBeanConstructorInfo[] constrInfo = info.getConstructors();
for (int i = 0; i < constrInfo.length; i++) {
sink.echo(" ** NAME: \t" + constrInfo[i].getName());
sink.echo(" DESCR: \t" + constrInfo[i].getDescription());
sink.echo(" PARAM: \t" + constrInfo[i].getSignature().length
+ " parameter(s)");
}
sink.echo("\nOPERATIONS");
MBeanOperationInfo[] opInfo = info.getOperations();
if (opInfo.length > 0) {
for (int i = 0; i < opInfo.length; i++) {
sink.echo(" ** NAME: \t" + opInfo[i].getName());
sink.echo(" DESCR: \t" + opInfo[i].getDescription());
sink.echo(" PARAM: \t" + opInfo[i].getSignature().length
+ " parameter(s)");
}
} else sink.echo(" ** No operations ** ");
sink.echo("\nNOTIFICATIONS");
MBeanNotificationInfo[] notifInfo = info.getNotifications();
if (notifInfo.length > 0) {
for (int i = 0; i < notifInfo.length; i++) {
sink.echo(" ** NAME: \t" + notifInfo[i].getName());
sink.echo(" DESCR: \t" + notifInfo[i].getDescription());
String notifTypes[] = notifInfo[i].getNotifTypes();
for (int j = 0; j < notifTypes.length; j++) {
sink.echo(" TYPE: \t" + notifTypes[j]);
}
}
} else sink.echo(" ** No notifications **");
}
private static MBeanInfo getMBeanInfoSafely(VarOutputSink sink,
MBeanServer mbs, ObjectName objectName) {
MBeanInfo info = null;
try {
info = mbs.getMBeanInfo(objectName);
} catch (InstanceNotFoundException e) {
sink.printVariable("ObjectName", "Not found");
} catch (IntrospectionException e) {
sink.printVariable("ObjectName", "IntrospectionException");
} catch (ReflectionException e) {
sink.printVariable("ObjectName", "ReflectionException");
}
return info;
}
/**
* Prints bean attributes to a {@link VarOutputSink}.
*
* @param sink The {@link VarOutputSink} to which attributes will be sent
* @param mbs The {@link MBeanServer} with respect to which the
* {@code objectName} is accessed
* @param objectName The {@link ObjectName} that identifies this bean
*/
public static void printMBeanAttributes(VarOutputSink sink, MBeanServer mbs,
ObjectName objectName) {
MBeanInfo info = getMBeanInfoSafely(sink, mbs, objectName);
if (info == null) {
sink.printVariable(objectName.getCanonicalName(), "can't fetch info");
return;
}
MBeanAttributeInfo[] attrInfo = info.getAttributes();
if (attrInfo.length > 0) {
for (int i = 0; i < attrInfo.length; i++) {
String attrName = attrInfo[i].getName();
Object attrValue = null;
String attrValueString = null;
try {
attrValue = mbs.getAttribute(objectName, attrName);
} catch (AttributeNotFoundException e) {
attrValueString = "AttributeNotFoundException";
} catch (InstanceNotFoundException e) {
attrValueString = "InstanceNotFoundException";
} catch (MBeanException e) {
attrValueString = "MBeanException";
} catch (ReflectionException e) {
attrValueString = "ReflectionException";
}
if (attrValueString == null) {
attrValueString = attrValue.toString();
}
sink.printVariable(attrName, attrValueString);
}
}
}
/**
* Helper interface defining output sinks used with
* {@link Utilities#printMBeanInfo(com.google.enterprise.util.jmx.Utils.VarOutputSink, MBeanServer, ObjectName)}
* and
* {@link Utilities#printMBeanAttributes(com.google.enterprise.util.jmx.Utils.VarOutputSink, MBeanServer, ObjectName)}
*/
public interface VarOutputSink {
public void printVariable(String name, String value);
public void echo(String string);
}
/**
* Static {@link VarOutputSink} that uses {@link System#out}
*/
public static final VarOutputSink SYSTEM_OUT_SINK = new PrintStreamVarOutputSink(
System.out);
public static class LoggerVarOutputSink implements VarOutputSink {
private final Logger logger;
public LoggerVarOutputSink(Logger logger) {
this.logger = logger;
}
public void printVariable(String name, String value) {
logger.info(name + " " + value);
}
public void echo(String string) {
logger.info(string);
}
}
public static class PrintWriterVarOutputSink implements VarOutputSink {
private final PrintWriter printWriter;
public PrintWriterVarOutputSink(PrintWriter printWriter) {
this.printWriter = printWriter;
}
public void printVariable(String name, String value) {
printWriter.print(" <b>");
printWriter.print(name);
printWriter.print("</b> ");
printWriter.print(value);
printWriter.println("<br>");
}
public void echo(String string) {
printWriter.print(string);
}
}
public static class PrintStreamVarOutputSink implements VarOutputSink {
private final PrintStream printStream;
public PrintStreamVarOutputSink(PrintStream printStream) {
this.printStream = printStream;
}
public void printVariable(String name, String value) {
printStream.print(" <b>");
printStream.print(name);
printStream.print("</b> ");
printStream.print(value);
printStream.println("<br>");
}
public void echo(String string) {
printStream.print(string);
}
}
}
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