JDK14/Java14源码在线阅读
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
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*
* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
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package sun.management;
import java.lang.management.MemoryUsage;
import java.lang.management.MemoryNotificationInfo;
import java.lang.management.MonitorInfo;
import java.lang.management.LockInfo;
import java.lang.management.ThreadInfo;
import java.lang.reflect.*;
import java.util.List;
import java.util.Map;
import java.util.*;
import java.io.InvalidObjectException;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import javax.management.openmbean.*;
import static javax.management.openmbean.SimpleType.*;
/**
* A mapped mxbean type maps a Java type to an open type.
* Only the following Java types are mappable
* (currently required by the platform MXBeans):
* <ol>
* <li>Primitive types</li>
* <li>Wrapper classes such java.lang.Integer, etc</li>
* <li>Classes with only getter methods and with a static "from" method
* that takes a CompositeData argument.</li>
* <li>{@code E[]} where {@code E} is a type of 1-4 (can be multi-dimensional array)</li>
* <li>{@code List<E>} where E is a type of 1-3</li>
* <li>{@code Map<K, V>} where {@code K} and {@code V} are a type of 1-4</li>
* </ol>
*
* OpenDataException will be thrown if a Java type is not supported.
*/
// Suppress unchecked cast warnings at line 442, 523 and 546
// Suppress unchecked calls at line 235, 284, 380 and 430.
@SuppressWarnings("unchecked")
public abstract class MappedMXBeanType {
private static final WeakHashMap<Type,MappedMXBeanType> convertedTypes =
new WeakHashMap<>();
boolean isBasicType = false;
OpenType<?> openType = inProgress;
Class<?> mappedTypeClass;
static synchronized MappedMXBeanType newMappedType(Type javaType)
throws OpenDataException {
MappedMXBeanType mt = null;
if (javaType instanceof Class) {
final Class<?> c = (Class<?>) javaType;
if (c.isEnum()) {
mt = new EnumMXBeanType(c);
} else if (c.isArray()) {
mt = new ArrayMXBeanType(c);
} else {
mt = new CompositeDataMXBeanType(c);
}
} else if (javaType instanceof ParameterizedType) {
final ParameterizedType pt = (ParameterizedType) javaType;
final Type rawType = pt.getRawType();
if (rawType instanceof Class) {
final Class<?> rc = (Class<?>) rawType;
if (rc == List.class) {
mt = new ListMXBeanType(pt);
} else if (rc == Map.class) {
mt = new MapMXBeanType(pt);
}
}
} else if (javaType instanceof GenericArrayType) {
final GenericArrayType t = (GenericArrayType) javaType;
mt = new GenericArrayMXBeanType(t);
}
// No open type mapped for the javaType
if (mt == null) {
throw new OpenDataException(javaType +
" is not a supported MXBean type.");
}
convertedTypes.put(javaType, mt);
return mt;
}
// basic types do not require data mapping
static synchronized MappedMXBeanType newBasicType(Class<?> c, OpenType<?> ot)
throws OpenDataException {
MappedMXBeanType mt = new BasicMXBeanType(c, ot);
convertedTypes.put(c, mt);
return mt;
}
public static synchronized MappedMXBeanType getMappedType(Type t)
throws OpenDataException {
MappedMXBeanType mt = convertedTypes.get(t);
if (mt == null) {
mt = newMappedType(t);
}
if (mt.getOpenType() instanceof InProgress) {
throw new OpenDataException("Recursive data structure");
}
return mt;
}
// Convert a class to an OpenType
public static synchronized OpenType<?> toOpenType(Type t)
throws OpenDataException {
MappedMXBeanType mt = getMappedType(t);
return mt.getOpenType();
}
public static Object toJavaTypeData(Object openData, Type t)
throws OpenDataException, InvalidObjectException {
if (openData == null) {
return null;
}
MappedMXBeanType mt = getMappedType(t);
return mt.toJavaTypeData(openData);
}
public static Object toOpenTypeData(Object data, Type t)
throws OpenDataException {
if (data == null) {
return null;
}
MappedMXBeanType mt = getMappedType(t);
return mt.toOpenTypeData(data);
}
// Return the mapped open type
public OpenType<?> getOpenType() {
return openType;
}
boolean isBasicType() {
return isBasicType;
}
// Return the type name of the mapped open type
// For primitive types, the type name is the same as the javaType
// but the mapped open type is the wrapper class
String getTypeName() {
return getMappedTypeClass().getName();
}
// Return the mapped open type
Class<?> getMappedTypeClass() {
return mappedTypeClass;
}
abstract Type getJavaType();
// return name of the class or the generic type
abstract String getName();
public abstract Object toOpenTypeData(Object javaTypeData)
throws OpenDataException;
public abstract Object toJavaTypeData(Object openTypeData)
throws OpenDataException, InvalidObjectException;
// Basic Types - Classes that do not require data conversion
// including primitive types and all SimpleType
//
// Mapped open type: SimpleType for corresponding basic type
//
// Data Mapping:
// T <-> T (no conversion)
//
static class BasicMXBeanType extends MappedMXBeanType {
final Class<?> basicType;
BasicMXBeanType(Class<?> c, OpenType<?> openType) {
this.basicType = c;
this.openType = openType;
this.mappedTypeClass = c;
this.isBasicType = true;
}
Type getJavaType() {
return basicType;
}
String getName() {
return basicType.getName();
}
public Object toOpenTypeData(Object data) throws OpenDataException {
return data;
}
public Object toJavaTypeData(Object data)
throws OpenDataException, InvalidObjectException {
return data;
}
}
// Enum subclasses
// Mapped open type - String
//
// Data Mapping:
// Enum <-> enum's name
//
static class EnumMXBeanType extends MappedMXBeanType {
@SuppressWarnings("rawtypes")
final Class enumClass;
EnumMXBeanType(Class<?> c) {
this.enumClass = c;
this.openType = STRING;
this.mappedTypeClass = String.class;
}
Type getJavaType() {
return enumClass;
}
String getName() {
return enumClass.getName();
}
public Object toOpenTypeData(Object data) throws OpenDataException {
return ((Enum) data).name();
}
public Object toJavaTypeData(Object data)
throws OpenDataException, InvalidObjectException {
try {
return Enum.valueOf(enumClass, (String) data);
} catch (IllegalArgumentException e) {
// missing enum constants
final InvalidObjectException ioe =
new InvalidObjectException("Enum constant named " +
(String) data + " is missing");
ioe.initCause(e);
throw ioe;
}
}
}
// Array E[]
// Mapped open type - Array with element of OpenType for E
//
// Data Mapping:
// E[] <-> openTypeData(E)[]
//
static class ArrayMXBeanType extends MappedMXBeanType {
final Class<?> arrayClass;
protected MappedMXBeanType componentType;
protected MappedMXBeanType baseElementType;
ArrayMXBeanType(Class<?> c) throws OpenDataException {
this.arrayClass = c;
this.componentType = getMappedType(c.getComponentType());
StringBuilder className = new StringBuilder();
Class<?> et = c;
int dim;
for (dim = 0; et.isArray(); dim++) {
className.append('[');
et = et.getComponentType();
}
baseElementType = getMappedType(et);
if (et.isPrimitive()) {
className = new StringBuilder(c.getName());
} else {
className.append('L').append(baseElementType.getTypeName()).append(';');
}
try {
mappedTypeClass = Class.forName(className.toString());
} catch (ClassNotFoundException e) {
final OpenDataException ode =
new OpenDataException("Cannot obtain array class");
ode.initCause(e);
throw ode;
}
openType = new ArrayType<>(dim, baseElementType.getOpenType());
}
protected ArrayMXBeanType() {
arrayClass = null;
};
Type getJavaType() {
return arrayClass;
}
String getName() {
return arrayClass.getName();
}
public Object toOpenTypeData(Object data) throws OpenDataException {
// If the base element type is a basic type
// return the data as no conversion is needed.
// Primitive types are not converted to wrappers.
if (baseElementType.isBasicType()) {
return data;
}
final Object[] array = (Object[]) data;
final Object[] openArray = (Object[])
Array.newInstance(componentType.getMappedTypeClass(),
array.length);
int i = 0;
for (Object o : array) {
if (o == null) {
openArray[i] = null;
} else {
openArray[i] = componentType.toOpenTypeData(o);
}
i++;
}
return openArray;
}
public Object toJavaTypeData(Object data)
throws OpenDataException, InvalidObjectException {
// If the base element type is a basic type
// return the data as no conversion is needed.
if (baseElementType.isBasicType()) {
return data;
}
final Object[] openArray = (Object[]) data;
final Object[] array = (Object[])
Array.newInstance((Class) componentType.getJavaType(),
openArray.length);
int i = 0;
for (Object o : openArray) {
if (o == null) {
array[i] = null;
} else {
array[i] = componentType.toJavaTypeData(o);
}
i++;
}
return array;
}
}
static class GenericArrayMXBeanType extends ArrayMXBeanType {
final GenericArrayType gtype;
GenericArrayMXBeanType(GenericArrayType gat) throws OpenDataException {
this.gtype = gat;
this.componentType = getMappedType(gat.getGenericComponentType());
StringBuilder className = new StringBuilder();
Type elementType = gat;
int dim;
for (dim = 0; elementType instanceof GenericArrayType; dim++) {
className.append('[');
GenericArrayType et = (GenericArrayType) elementType;
elementType = et.getGenericComponentType();
}
baseElementType = getMappedType(elementType);
if (elementType instanceof Class && ((Class) elementType).isPrimitive()) {
className = new StringBuilder(gat.toString());
} else {
className.append('L').append(baseElementType.getTypeName()).append(';');
}
try {
mappedTypeClass = Class.forName(className.toString());
} catch (ClassNotFoundException e) {
final OpenDataException ode =
new OpenDataException("Cannot obtain array class");
ode.initCause(e);
throw ode;
}
openType = new ArrayType<>(dim, baseElementType.getOpenType());
}
Type getJavaType() {
return gtype;
}
String getName() {
return gtype.toString();
}
}
// List<E>
// Mapped open type - Array with element of OpenType for E
//
// Data Mapping:
// List<E> <-> openTypeData(E)[]
//
static class ListMXBeanType extends MappedMXBeanType {
final ParameterizedType javaType;
final MappedMXBeanType paramType;
final String typeName;
ListMXBeanType(ParameterizedType pt) throws OpenDataException {
this.javaType = pt;
final Type[] argTypes = pt.getActualTypeArguments();
assert(argTypes.length == 1);
if (!(argTypes[0] instanceof Class)) {
throw new OpenDataException("Element Type for " + pt +
" not supported");
}
final Class<?> et = (Class<?>) argTypes[0];
if (et.isArray()) {
throw new OpenDataException("Element Type for " + pt +
" not supported");
}
paramType = getMappedType(et);
typeName = "List<" + paramType.getName() + ">";
try {
mappedTypeClass = Class.forName(
"[L" + paramType.getTypeName() + ";");
} catch (ClassNotFoundException e) {
final OpenDataException ode =
new OpenDataException("Array class not found");
ode.initCause(e);
throw ode;
}
openType = new ArrayType<>(1, paramType.getOpenType());
}
Type getJavaType() {
return javaType;
}
String getName() {
return typeName;
}
public Object toOpenTypeData(Object data) throws OpenDataException {
final List<Object> list = (List<Object>) data;
final Object[] openArray = (Object[])
Array.newInstance(paramType.getMappedTypeClass(),
list.size());
int i = 0;
for (Object o : list) {
openArray[i++] = paramType.toOpenTypeData(o);
}
return openArray;
}
public Object toJavaTypeData(Object data)
throws OpenDataException, InvalidObjectException {
final Object[] openArray = (Object[]) data;
List<Object> result = new ArrayList<>(openArray.length);
for (Object o : openArray) {
result.add(paramType.toJavaTypeData(o));
}
return result;
}
}
private static final String KEY = "key";
private static final String VALUE = "value";
private static final String[] mapIndexNames = {KEY};
private static final String[] mapItemNames = {KEY, VALUE};
// Map<K,V>
// Mapped open type - TabularType with row type:
// CompositeType:
// "key" of openDataType(K)
// "value" of openDataType(V)
// "key" is the index name
//
// Data Mapping:
// Map<K,V> <-> TabularData
//
static class MapMXBeanType extends MappedMXBeanType {
final ParameterizedType javaType;
final MappedMXBeanType keyType;
final MappedMXBeanType valueType;
final String typeName;
MapMXBeanType(ParameterizedType pt) throws OpenDataException {
this.javaType = pt;
final Type[] argTypes = pt.getActualTypeArguments();
assert(argTypes.length == 2);
this.keyType = getMappedType(argTypes[0]);
this.valueType = getMappedType(argTypes[1]);
// FIXME: generate typeName for generic
typeName = "Map<" + keyType.getName() + "," +
valueType.getName() + ">";
final OpenType<?>[] mapItemTypes = new OpenType<?>[] {
keyType.getOpenType(),
valueType.getOpenType(),
};
final CompositeType rowType =
new CompositeType(typeName,
typeName,
mapItemNames,
mapItemNames,
mapItemTypes);
openType = new TabularType(typeName, typeName, rowType, mapIndexNames);
mappedTypeClass = javax.management.openmbean.TabularData.class;
}
Type getJavaType() {
return javaType;
}
String getName() {
return typeName;
}
public Object toOpenTypeData(Object data) throws OpenDataException {
final Map<Object,Object> map = (Map<Object,Object>) data;
final TabularType tabularType = (TabularType) openType;
final TabularData table = new TabularDataSupport(tabularType);
final CompositeType rowType = tabularType.getRowType();
for (Map.Entry<Object, Object> entry : map.entrySet()) {
final Object key = keyType.toOpenTypeData(entry.getKey());
final Object value = valueType.toOpenTypeData(entry.getValue());
final CompositeData row =
new CompositeDataSupport(rowType,
mapItemNames,
new Object[] {key, value});
table.put(row);
}
return table;
}
public Object toJavaTypeData(Object data)
throws OpenDataException, InvalidObjectException {
final TabularData td = (TabularData) data;
Map<Object, Object> result = new HashMap<>();
for (CompositeData row : (Collection<CompositeData>) td.values()) {
Object key = keyType.toJavaTypeData(row.get(KEY));
Object value = valueType.toJavaTypeData(row.get(VALUE));
result.put(key, value);
}
return result;
}
}
private static final Class<?> COMPOSITE_DATA_CLASS =
javax.management.openmbean.CompositeData.class;
// Classes that have a static from method
// Mapped open type - CompositeData
//
// Data Mapping:
// Classes <-> CompositeData
//
// The name and type of items for a class are identified from
// the getter methods. For example, a class defines a method:
//
// public FooType getFoo();
//
// The composite data view for this class will contain one
// item entry for a "foo" attribute and the item type is
// one of the open types defined in the OpenType class that
// can be determined in the following manner:
// o If FooType is a primitive type, the item type a wrapper
// class for the corresponding primitive type (such as
// Integer, Long, Boolean, etc).
// o If FooType is of type CompositeData or TabularData,
// the item type is FooType.
// o If FooType is an Enum, the item type is a String and
// the value is the name of the enum constant.
// o If FooType is a class or an interface other than the above,
// the item type is CompositeData. The same convention
// can be recursively applied to the FooType class when
// constructing the composite data for the "foo" attribute.
// o If FooType is an array, the item type is an array and
// its element type is determined as described above.
//
static class CompositeDataMXBeanType extends MappedMXBeanType {
final Class<?> javaClass;
boolean isCompositeData = false;
Method fromMethod = null;
Method toMethod = null;
CompositeDataMXBeanType(Class<?> c) throws OpenDataException {
this.javaClass = c;
this.mappedTypeClass = COMPOSITE_DATA_CLASS;
// check if a static from method exists
try {
fromMethod = AccessController.doPrivileged(new PrivilegedExceptionAction<Method>() {
public Method run() throws NoSuchMethodException {
return javaClass.getMethod("from", COMPOSITE_DATA_CLASS);
}
});
} catch (PrivilegedActionException e) {
// ignore NoSuchMethodException since we allow classes
// that has no from method to be embeded in another class.
}
if (COMPOSITE_DATA_CLASS.isAssignableFrom(c)) {
// c implements CompositeData - set openType to null
// defer generating the CompositeType
// until the object is constructed
this.isCompositeData = true;
this.openType = null;
} else {
this.isCompositeData = false;
// Make a CompositeData containing all the getters
final Method[] methods =
AccessController.doPrivileged(new PrivilegedAction<Method[]>() {
public Method[] run() {
return javaClass.getMethods();
}
});
final List<String> names = new ArrayList<>();
final List<OpenType<?>> types = new ArrayList<>();
/* Select public methods that look like "T getX()" or "boolean
isX()", where T is not void and X is not the empty
string. Exclude "Class getClass()" inherited from Object. */
for (int i = 0; i < methods.length; i++) {
final Method method = methods[i];
final String name = method.getName();
final Type type = method.getGenericReturnType();
final String rest;
if (name.startsWith("get")) {
rest = name.substring(3);
} else if (name.startsWith("is") &&
type instanceof Class &&
((Class) type) == boolean.class) {
rest = name.substring(2);
} else {
// ignore non-getter methods
continue;
}
if (rest.isEmpty() ||
method.getParameterTypes().length > 0 ||
type == void.class ||
rest.equals("Class")) {
// ignore non-getter methods
continue;
}
names.add(decapitalize(rest));
types.add(toOpenType(type));
}
final String[] nameArray = names.toArray(new String[0]);
openType = new CompositeType(c.getName(),
c.getName(),
nameArray, // field names
nameArray, // field descriptions
types.toArray(new OpenType<?>[0]));
}
}
Type getJavaType() {
return javaClass;
}
String getName() {
return javaClass.getName();
}
public Object toOpenTypeData(Object data) throws OpenDataException {
if (toMethod != null) {
try {
return toMethod.invoke(null, data);
} catch (IllegalAccessException e) {
// should never reach here
throw new AssertionError(e);
} catch (InvocationTargetException e) {
final OpenDataException ode
= new OpenDataException("Failed to invoke "
+ toMethod.getName() + " to convert " + javaClass.getName()
+ " to CompositeData");
ode.initCause(e);
throw ode;
}
}
if (data instanceof MemoryUsage) {
return MemoryUsageCompositeData.toCompositeData((MemoryUsage) data);
}
if (data instanceof ThreadInfo) {
return ThreadInfoCompositeData.toCompositeData((ThreadInfo) data);
}
if (data instanceof LockInfo) {
if (data instanceof java.lang.management.MonitorInfo) {
return MonitorInfoCompositeData.toCompositeData((MonitorInfo) data);
}
return LockInfoCompositeData.toCompositeData((LockInfo) data);
}
if (data instanceof MemoryNotificationInfo) {
return MemoryNotifInfoCompositeData.
toCompositeData((MemoryNotificationInfo) data);
}
if (isCompositeData) {
// Classes that implement CompositeData
//
// construct a new CompositeDataSupport object
// so that no other classes are sent over the wire
CompositeData cd = (CompositeData) data;
CompositeType ct = cd.getCompositeType();
String[] itemNames = ct.keySet().toArray(new String[0]);
Object[] itemValues = cd.getAll(itemNames);
return new CompositeDataSupport(ct, itemNames, itemValues);
}
throw new OpenDataException(javaClass.getName() +
" is not supported for platform MXBeans");
}
public Object toJavaTypeData(Object data)
throws OpenDataException, InvalidObjectException {
if (fromMethod == null) {
throw new AssertionError("Does not support data conversion");
}
try {
return fromMethod.invoke(null, data);
} catch (IllegalAccessException e) {
// should never reach here
throw new AssertionError(e);
} catch (InvocationTargetException e) {
final OpenDataException ode =
new OpenDataException("Failed to invoke " +
fromMethod.getName() + " to convert CompositeData " +
" to " + javaClass.getName());
ode.initCause(e);
throw ode;
}
}
}
private static class InProgress<T> extends OpenType<T> {
private static final String description =
"Marker to detect recursive type use -- internal use only!";
InProgress() throws OpenDataException {
super("java.lang.String", "java.lang.String", description);
}
public String toString() {
return description;
}
public int hashCode() {
return 0;
}
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