package org.eclipse.jetty.jmx;
import java.lang.annotation.Annotation;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.stream.Collectors;
import javax.management.Attribute;
import javax.management.AttributeNotFoundException;
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.MBeanParameterInfo;
import javax.management.ObjectName;
import javax.management.ReflectionException;
import javax.management.modelmbean.ModelMBean;
import org.eclipse.jetty.util.annotation.ManagedAttribute;
import org.eclipse.jetty.util.annotation.ManagedObject;
import org.eclipse.jetty.util.annotation.ManagedOperation;
import org.eclipse.jetty.util.annotation.Name;
import org.eclipse.jetty.util.log.Log;
import org.eclipse.jetty.util.log.Logger;
class MetaData
{
private static final Logger LOG = Log.getLogger(MetaData.class);
private static final MBeanAttributeInfo[] NO_ATTRIBUTES = new MBeanAttributeInfo[0];
private static final MBeanConstructorInfo[] NO_CONSTRUCTORS = new MBeanConstructorInfo[0];
private static final MBeanOperationInfo[] NO_OPERATIONS = new MBeanOperationInfo[0];
private static final MBeanNotificationInfo[] NO_NOTIFICATIONS = new MBeanNotificationInfo[0];
private final Map<String, AttributeInfo> _attributes = new HashMap<>();
private final Map<String, OperationInfo> _operations = new HashMap<>();
private final Class<?> _klass;
private final MetaData _parent;
private final List<MetaData> _interfaces;
private final Constructor<?> _constructor;
private final MBeanInfo _info;
MetaData(Class<?> klass, Constructor<?> constructor, MetaData parent, List<MetaData> interfaces)
{
_klass = klass;
_parent = parent;
_interfaces = interfaces;
_constructor = constructor;
if (_constructor != null)
parseMethods(klass, _constructor.getDeclaringClass());
else
parseMethods(klass);
_info = buildMBeanInfo(klass);
}
Object newInstance(Object bean)
{
Object mbean;
if (_constructor != null)
mbean = newInstance(_constructor, bean);
else if (_parent != null)
mbean = _parent.newInstance(bean);
else
mbean = new ObjectMBean(bean);
return mbean;
}
private static Object newInstance(Constructor<?> constructor, Object bean)
{
try
{
Object mbean = constructor.getParameterCount() == 0 ? constructor.newInstance() : constructor.newInstance(bean);
if (mbean instanceof ModelMBean)
((ModelMBean)mbean).setManagedResource(bean, "objectReference");
return mbean;
}
catch (Throwable x)
{
return null;
}
}
MBeanInfo getMBeanInfo()
{
return _info;
}
Object getAttribute(String name, ObjectMBean mbean) throws AttributeNotFoundException, ReflectionException, MBeanException
{
AttributeInfo info = findAttribute(name);
if (info == null)
throw new AttributeNotFoundException(name);
return info.getAttribute(mbean);
}
void setAttribute(Attribute attribute, ObjectMBean mbean) throws AttributeNotFoundException, ReflectionException, MBeanException
{
if (attribute == null)
return;
String name = attribute.getName();
AttributeInfo info = findAttribute(name);
if (info == null)
throw new AttributeNotFoundException(name);
info.setAttribute(attribute.getValue(), mbean);
}
private AttributeInfo findAttribute(String name)
{
if (name == null)
return null;
AttributeInfo result = null;
for (MetaData intf : _interfaces)
{
AttributeInfo r = intf.findAttribute(name);
if (r != null)
result = r;
}
if (_parent != null)
{
AttributeInfo r = _parent.findAttribute(name);
if (r != null)
result = r;
}
AttributeInfo r = _attributes.get(name);
if (r != null)
result = r;
return result;
}
Object invoke(String name, String[] params, Object[] args, ObjectMBean mbean) throws ReflectionException, MBeanException
{
String signature = signature(name, params);
OperationInfo info = findOperation(signature);
if (info == null)
throw new ReflectionException(new NoSuchMethodException(signature));
return info.invoke(args, mbean);
}
private OperationInfo findOperation(String signature)
{
OperationInfo result = null;
for (MetaData intf : _interfaces)
{
OperationInfo r = intf.findOperation(signature);
if (r != null)
result = r;
}
if (_parent != null)
{
OperationInfo r = _parent.findOperation(signature);
if (r != null)
result = r;
}
OperationInfo r = _operations.get(signature);
if (r != null)
result = r;
return result;
}
private void parseMethods(Class<?>... classes)
{
for (Class<?> klass : classes)
{
for (Method method : klass.getDeclaredMethods())
{
if (!Modifier.isPublic(method.getModifiers()))
continue;
ManagedAttribute attribute = method.getAnnotation(ManagedAttribute.class);
if (attribute != null)
{
AttributeInfo info = new AttributeInfo(attribute, method);
if (LOG.isDebugEnabled())
LOG.debug("Found attribute {} for {}: {}", info._name, klass.getName(), info);
_attributes.put(info._name, info);
}
ManagedOperation operation = method.getAnnotation(ManagedOperation.class);
if (operation != null)
{
OperationInfo info = new OperationInfo(operation, method);
if (LOG.isDebugEnabled())
LOG.debug("Found operation {} for {}: {}", info._name, klass.getName(), info);
_operations.put(info._name, info);
}
}
}
}
static String toAttributeName(String methodName)
{
String attributeName = methodName;
if (methodName.startsWith("get") || methodName.startsWith("set"))
attributeName = attributeName.substring(3);
else if (methodName.startsWith("is"))
attributeName = attributeName.substring(2);
return attributeName.substring(0, 1).toLowerCase(Locale.ENGLISH) + attributeName.substring(1);
}
private static boolean isManagedObject(Class<?> klass)
{
if (klass.isArray())
klass = klass.getComponentType();
if (klass.isPrimitive())
return false;
while (klass != null)
{
if (klass.isAnnotationPresent(ManagedObject.class))
return true;
klass = klass.getSuperclass();
}
return false;
}
private static String signature(String name, String[] params)
{
return String.format("%s(%s)", name, String.join(",", params));
}
private static String signature(Method method)
{
String signature = Arrays.stream(method.getParameterTypes())
.map(Class::getName)
.collect(Collectors.joining(","));
return String.format("%s(%s)", method.getName(), signature);
}
private MBeanInfo buildMBeanInfo(Class<?> klass)
{
ManagedObject managedObject = klass.getAnnotation(ManagedObject.class);
String description = managedObject == null ? "" : managedObject.value();
Map<String, MBeanAttributeInfo> attributeInfos = new HashMap<>();
collectMBeanAttributeInfos(attributeInfos);
Map<String, MBeanOperationInfo> operationInfos = new HashMap<>();
collectMBeanOperationInfos(operationInfos);
MBeanInfo mbeanInfo = _parent == null ? null : _parent.getMBeanInfo();
MBeanAttributeInfo[] attributes = attributeInfos.values().toArray(NO_ATTRIBUTES);
MBeanConstructorInfo[] constructors = mbeanInfo == null ? NO_CONSTRUCTORS : mbeanInfo.getConstructors();
MBeanOperationInfo[] operations = operationInfos.values().toArray(NO_OPERATIONS);
MBeanNotificationInfo[] notifications = mbeanInfo == null ? NO_NOTIFICATIONS : mbeanInfo.getNotifications();
return new MBeanInfo(klass.getName(), description, attributes, constructors, operations, notifications);
}
private void collectMBeanAttributeInfos(Map<String, MBeanAttributeInfo> attributeInfos)
{
for (MetaData intf : _interfaces)
{
intf.collectMBeanAttributeInfos(attributeInfos);
}
if (_parent != null)
{
MBeanAttributeInfo[] parentAttributes = _parent.getMBeanInfo().getAttributes();
for (MBeanAttributeInfo parentAttribute : parentAttributes)
{
attributeInfos.put(parentAttribute.getName(), parentAttribute);
}
}
for (Map.Entry<String, AttributeInfo> entry : _attributes.entrySet())
{
attributeInfos.put(entry.getKey(), entry.getValue()._info);
}
}
private void collectMBeanOperationInfos(Map<String, MBeanOperationInfo> operationInfos)
{
for (MetaData intf : _interfaces)
{
intf.collectMBeanOperationInfos(operationInfos);
}
if (_parent != null)
{
MBeanOperationInfo[] parentOperations = _parent.getMBeanInfo().getOperations();
for (MBeanOperationInfo parentOperation : parentOperations)
{
String signature = signature(parentOperation.getName(), Arrays.stream(parentOperation.getSignature()).map(MBeanParameterInfo::getType).toArray(String[]::new));
operationInfos.put(signature, parentOperation);
}
}
for (Map.Entry<String, OperationInfo> entry : _operations.entrySet())
{
operationInfos.put(entry.getKey(), entry.getValue()._info);
}
}
private static MBeanException toMBeanException(InvocationTargetException x)
{
Throwable cause = x.getCause();
if (cause instanceof Exception)
return new MBeanException((Exception)cause);
else
return new MBeanException(x);
}
@Override
public String toString()
{
return String.format("%s@%x[%s, attrs=%s, opers=%s]", getClass().getSimpleName(), hashCode(),
_klass.getName(), _attributes.keySet(), _operations.keySet());
}
private static class AttributeInfo
{
private final String _name;
private final Method _getter;
private final Method _setter;
private final boolean _proxied;
private final boolean _convert;
private final MBeanAttributeInfo _info;
private AttributeInfo(ManagedAttribute attribute, Method getter)
{
String name = attribute.name();
if ("".equals(name))
name = toAttributeName(getter.getName());
_name = name;
_getter = getter;
boolean readOnly = attribute.readonly();
_setter = readOnly ? null : findSetter(attribute, getter, name);
_proxied = attribute.proxied();
Class<?> returnType = getter.getReturnType();
_convert = isManagedObject(returnType);
String signature = _convert
? returnType.isArray()
? ObjectName[].class.getName()
: ObjectName.class.getName()
: returnType.getName();
String description = attribute.value();
_info = new MBeanAttributeInfo(name, signature, description, true,
_setter != null, getter.getName().startsWith("is"));
}
Object getAttribute(ObjectMBean mbean) throws ReflectionException, MBeanException
{
try
{
Object target = mbean.getManagedObject();
if (_proxied || _getter.getDeclaringClass().isInstance(mbean))
target = mbean;
Object result = _getter.invoke(target);
if (result == null)
return null;
if (!_convert)
return result;
if (!_getter.getReturnType().isArray())
return mbean.findObjectName(result);
int length = Array.getLength(result);
ObjectName[] names = new ObjectName[length];
for (int i = 0; i < length; ++i)
{
names[i] = mbean.findObjectName(Array.get(result, i));
}
return names;
}
catch (InvocationTargetException x)
{
throw toMBeanException(x);
}
catch (Exception x)
{
throw new ReflectionException(x);
}
}
void setAttribute(Object value, ObjectMBean mbean) throws ReflectionException, MBeanException
{
if (LOG.isDebugEnabled())
LOG.debug("setAttribute {}.{}={} {}", mbean, _info.getName(), value, _info);
try
{
if (_setter == null)
return;
Object target = mbean.getManagedObject();
if (_proxied || _setter.getDeclaringClass().isInstance(mbean))
target = mbean;
if (!_convert || value == null)
{
_setter.invoke(target, value);
return;
}
if (!_getter.getReturnType().isArray())
{
value = mbean.findBean((ObjectName)value);
_setter.invoke(target, value);
return;
}
ObjectName[] names = (ObjectName[])value;
Object result = new Object[names.length];
for (int i = 0; i < names.length; ++i)
{
Array.set(result, i, mbean.findBean(names[i]));
}
_setter.invoke(target, result);
}
catch (InvocationTargetException x)
{
throw toMBeanException(x);
}
catch (Exception x)
{
throw new ReflectionException(x);
}
}
private Method findSetter(ManagedAttribute attribute, Method getter, String name)
{
String setterName = attribute.setter();
if ("".equals(setterName))
setterName = "set" + name.substring(0, 1).toUpperCase(Locale.ENGLISH) + name.substring(1);
Method setter = null;
Class<?> klass = getter.getDeclaringClass();
for (Method method : klass.getMethods())
{
if (method.getName().equals(setterName) && method.getParameterCount() == 1)
{
if (setter != null)
{
LOG.info("Multiple setters for mbean attribute {} in {}", name, klass);
continue;
}
if (!getter.getReturnType().equals(method.getParameterTypes()[0]))
{
LOG.info("Getter/setter type mismatch for mbean attribute {} in {}", name, klass);
continue;
}
setter = method;
}
}
return setter;
}
@Override
public String toString()
{
return String.format("%s@%x[%s,proxied=%b,convert=%b,info=%s]", getClass().getSimpleName(), hashCode(),
_name, _proxied, _convert, _info);
}
}
private static class OperationInfo
{
private final String _name;
private final Method _method;
private final boolean _proxied;
private final boolean _convert;
private final MBeanOperationInfo _info;
private OperationInfo(ManagedOperation operation, Method method)
{
_name = signature(method);
_method = method;
_proxied = operation.proxied();
Class<?> returnType = method.getReturnType();
_convert = isManagedObject(returnType);
String returnSignature = _convert
? returnType.isArray()
? ObjectName[].class.getName()
: ObjectName.class.getName()
: returnType.getName();
String impactName = operation.impact();
int impact = MBeanOperationInfo.UNKNOWN;
if ("ACTION".equals(impactName))
impact = MBeanOperationInfo.ACTION;
else if ("INFO".equals(impactName))
impact = MBeanOperationInfo.INFO;
else if ("ACTION_INFO".equals(impactName))
impact = MBeanOperationInfo.ACTION_INFO;
String description = operation.value();
MBeanParameterInfo[] parameterInfos = parameters(method.getParameterTypes(), method.getParameterAnnotations());
_info = new MBeanOperationInfo(method.getName(), description, parameterInfos, returnSignature, impact);
}
public Object invoke(Object[] args, ObjectMBean mbean) throws ReflectionException, MBeanException
{
if (LOG.isDebugEnabled())
LOG.debug("invoke {}.{}({}) {}", mbean, _info.getName(), Arrays.asList(args), _info);
try
{
Object target = mbean.getManagedObject();
if (_proxied || _method.getDeclaringClass().isInstance(mbean))
target = mbean;
Object result = _method.invoke(target, args);
if (result == null)
return null;
if (!_convert)
return result;
if (!_method.getReturnType().isArray())
return mbean.findObjectName(result);
int length = Array.getLength(result);
ObjectName[] names = new ObjectName[length];
for (int i = 0; i < length; ++i)
{
names[i] = mbean.findObjectName(Array.get(result, i));
}
return names;
}
catch (InvocationTargetException x)
{
throw toMBeanException(x);
}
catch (Exception x)
{
throw new ReflectionException(x);
}
}
private static MBeanParameterInfo[] parameters(Class<?>[] parameterTypes, Annotation[][] parametersAnnotations)
{
MBeanParameterInfo[] result = new MBeanParameterInfo[parameterTypes.length];
for (int i = 0; i < parametersAnnotations.length; i++)
{
MBeanParameterInfo info = null;
String typeName = parameterTypes[i].getName();
Annotation[] parameterAnnotations = parametersAnnotations[i];
for (Annotation parameterAnnotation : parameterAnnotations)
{
if (parameterAnnotation instanceof Name)
{
Name name = (Name)parameterAnnotation;
info = result[i] = new MBeanParameterInfo(name.value(), typeName, name.description());
break;
}
}
if (info == null)
result[i] = new MBeanParameterInfo("p" + i, typeName, "");
}
return result;
}
@Override
public String toString()
{
return String.format("%s@%x[%s,proxied=%b,convert=%b]", getClass().getSimpleName(), hashCode(),
_name, _proxied, _convert);
}
}
}
MetaData
LOG: Logger
toString(): String
http://www.eclipse.org/jetty: JMX management artifact for jetty.
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