/*
* @(#)MXBeanIntrospector.java 1.10 06/04/12
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package com.sun.jmx.mbeanserver;
import java.lang.annotation.Annotation;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import javax.management.Descriptor;
import javax.management.ImmutableDescriptor;
import javax.management.MBeanAttributeInfo;
import javax.management.MBeanException;
import javax.management.MBeanOperationInfo;
import javax.management.MBeanParameterInfo;
import javax.management.NotCompliantMBeanException;
import javax.management.openmbean.OpenMBeanAttributeInfoSupport;
import javax.management.openmbean.OpenMBeanOperationInfoSupport;
import javax.management.openmbean.OpenMBeanParameterInfo;
import javax.management.openmbean.OpenMBeanParameterInfoSupport;
import javax.management.openmbean.OpenType;
/**
* Introspector for MXBeans. There is exactly one instance of this class.
*
* @since 1.6
*/
class MXBeanIntrospector extends MBeanIntrospector<ConvertingMethod> {
private static final MXBeanIntrospector instance = new MXBeanIntrospector();
static MXBeanIntrospector getInstance() {
return instance;
}
@Override
PerInterfaceMap<ConvertingMethod> getPerInterfaceMap() {
return perInterfaceMap;
}
@Override
MBeanInfoMap getMBeanInfoMap() {
return mbeanInfoMap;
}
@Override
MBeanAnalyzer<ConvertingMethod> getAnalyzer(Class<?> mbeanInterface)
throws NotCompliantMBeanException {
return MBeanAnalyzer.analyzer(mbeanInterface, this);
}
@Override
boolean isMXBean() {
return true;
}
@Override
ConvertingMethod mFrom(Method m) {
return ConvertingMethod.from(m);
}
@Override
String getName(ConvertingMethod m) {
return m.getName();
}
@Override
Type getGenericReturnType(ConvertingMethod m) {
return m.getGenericReturnType();
}
@Override
Type[] getGenericParameterTypes(ConvertingMethod m) {
return m.getGenericParameterTypes();
}
@Override
String[] getSignature(ConvertingMethod m) {
return m.getOpenSignature();
}
@Override
void checkMethod(ConvertingMethod m) {
m.checkCallFromOpen();
}
@Override
Object invokeM2(ConvertingMethod m, Object target, Object[] args,
Object cookie)
throws InvocationTargetException, IllegalAccessException,
MBeanException {
return m.invokeWithOpenReturn((MXBeanLookup) cookie, target, args);
}
@Override
boolean validParameter(ConvertingMethod m, Object value, int paramNo,
Object cookie) {
if (value == null) {
// Null is a valid value for all OpenTypes, even though
// OpenType.isValue(null) will return false. It can always be
// matched to the corresponding Java type, except when that
// type is primitive.
Type t = m.getGenericParameterTypes()[paramNo];
return (!(t instanceof Class) || !((Class) t).isPrimitive());
} else {
Object v;
try {
v = m.fromOpenParameter((MXBeanLookup) cookie, value, paramNo);
} catch (Exception e) {
// Ignore the exception and let MBeanIntrospector.invokeSetter()
// throw the initial exception.
return true;
}
return isValidParameter(m.getMethod(), v, paramNo);
}
}
@Override
MBeanAttributeInfo getMBeanAttributeInfo(String attributeName,
ConvertingMethod getter, ConvertingMethod setter) {
final boolean isReadable = (getter != null);
final boolean isWritable = (setter != null);
final boolean isIs = isReadable && getName(getter).startsWith("is");
final String description = attributeName;
final OpenType<?> openType;
final Type originalType;
if (isReadable) {
openType = getter.getOpenReturnType();
originalType = getter.getGenericReturnType();
} else {
openType = setter.getOpenParameterTypes()[0];
originalType = setter.getGenericParameterTypes()[0];
}
Descriptor descriptor = typeDescriptor(openType, originalType);
if (isReadable) {
descriptor = ImmutableDescriptor.union(descriptor,
getter.getDescriptor());
}
if (isWritable) {
descriptor = ImmutableDescriptor.union(descriptor,
setter.getDescriptor());
}
final MBeanAttributeInfo ai;
if (canUseOpenInfo(originalType)) {
ai = new OpenMBeanAttributeInfoSupport(attributeName,
description,
openType,
isReadable,
isWritable,
isIs,
descriptor);
} else {
ai = new MBeanAttributeInfo(attributeName,
originalTypeString(originalType),
description,
isReadable,
isWritable,
isIs,
descriptor);
}
// could also consult annotations for defaultValue,
// minValue, maxValue, legalValues
return ai;
}
@Override
MBeanOperationInfo getMBeanOperationInfo(String operationName,
ConvertingMethod operation) {
final Method method = operation.getMethod();
final String description = operationName;
/* Ideally this would be an empty string, but
OMBOperationInfo constructor forbids that. Also, we
could consult an annotation to get a useful
description. */
final int impact = MBeanOperationInfo.UNKNOWN;
final OpenType<?> returnType = operation.getOpenReturnType();
final Type originalReturnType = operation.getGenericReturnType();
final OpenType<?>[] paramTypes = operation.getOpenParameterTypes();
final Type[] originalParamTypes = operation.getGenericParameterTypes();
final MBeanParameterInfo[] params =
new MBeanParameterInfo[paramTypes.length];
boolean openReturnType = canUseOpenInfo(originalReturnType);
boolean openParameterTypes = true;
Annotation[][] annots = method.getParameterAnnotations();
for (int i = 0; i < paramTypes.length; i++) {
final String paramName = "p" + i;
final String paramDescription = paramName;
final OpenType<?> openType = paramTypes[i];
final Type originalType = originalParamTypes[i];
Descriptor descriptor =
typeDescriptor(openType, originalType);
descriptor = ImmutableDescriptor.union(descriptor,
Introspector.descriptorForAnnotations(annots[i]));
final MBeanParameterInfo pi;
if (canUseOpenInfo(originalType)) {
pi = new OpenMBeanParameterInfoSupport("p" + i,
paramDescription,
openType,
descriptor);
} else {
openParameterTypes = false;
pi = new MBeanParameterInfo(
"p" + i,
originalTypeString(originalType),
paramDescription,
descriptor);
}
params[i] = pi;
}
Descriptor descriptor =
typeDescriptor(returnType, originalReturnType);
descriptor = ImmutableDescriptor.union(descriptor,
Introspector.descriptorForElement(method));
final MBeanOperationInfo oi;
if (openReturnType && openParameterTypes) {
/* If the return value and all the parameters can be faithfully
* represented as OpenType then we return an OpenMBeanOperationInfo.
* If any of them is a primitive type, we can't. Compatibility
* with JSR 174 means that we must return an MBean*Info where
* the getType() is the primitive type, not its wrapped type as
* we would get with an OpenMBean*Info. The OpenType is available
* in the Descriptor in either case.
*/
final OpenMBeanParameterInfo[] oparams =
new OpenMBeanParameterInfo[params.length];
System.arraycopy(params, 0, oparams, 0, params.length);
oi = new OpenMBeanOperationInfoSupport(operationName,
description,
oparams,
returnType,
impact,
descriptor);
} else {
oi = new MBeanOperationInfo(operationName,
description,
params,
openReturnType ?
returnType.getClassName() :
originalTypeString(originalReturnType),
impact,
descriptor);
}
return oi;
}
@Override
Descriptor getBasicMBeanDescriptor() {
return new ImmutableDescriptor("mxbean=true",
"immutableInfo=true");
}
@Override
Descriptor getMBeanDescriptor(Class<?> resourceClass) {
/* We already have immutableInfo=true in the Descriptor
* included in the MBeanInfo for the MXBean interface. This
* method is being called for the MXBean *class* to add any
* new items beyond those in the interface Descriptor, which
* currently it does not.
*/
return ImmutableDescriptor.EMPTY_DESCRIPTOR;
}
private static Descriptor typeDescriptor(OpenType openType,
Type originalType) {
return new ImmutableDescriptor(
new String[] {"openType",
"originalType"},
new Object[] {openType,
originalTypeString(originalType)});
}
/**
* <p>True if this type can be faithfully represented in an
* OpenMBean*Info.</p>
*
* <p>Compatibility with JSR 174 means that primitive types must be
* represented by an MBean*Info whose getType() is the primitive type
* string, e.g. "int". If we used an OpenMBean*Info then this string
* would be the wrapped type, e.g. "java.lang.Integer".</p>
*
* <p>Compatibility with JMX 1.2 (including J2SE 5.0) means that arrays
* of primitive types cannot use an ArrayType representing an array of
* primitives, because that didn't exist in JMX 1.2.</p>
*/
private static boolean canUseOpenInfo(Type type) {
if (type instanceof GenericArrayType) {
return canUseOpenInfo(
((GenericArrayType) type).getGenericComponentType());
} else if (type instanceof Class && ((Class<?>) type).isArray()) {
return canUseOpenInfo(
((Class<?>) type).getComponentType());
}
return (!(type instanceof Class && ((Class<?>) type).isPrimitive()));
}
private static String originalTypeString(Type type) {
if (type instanceof Class)
return ((Class) type).getName();
else
return type.toString();
}
private static final PerInterfaceMap<ConvertingMethod>
perInterfaceMap = new PerInterfaceMap<ConvertingMethod>();
private static final MBeanInfoMap mbeanInfoMap = new MBeanInfoMap();
}