JDK14/Java14源码在线阅读
/*
* Copyright (c) 2016, 2018, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* 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
* by Oracle in the LICENSE file that accompanied this code.
*
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package jdk.jfr.internal;
import java.io.IOException;
import java.lang.annotation.Annotation;
import java.lang.annotation.Repeatable;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Queue;
import java.util.Set;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.stream.Stream;
import jdk.jfr.AnnotationElement;
import jdk.jfr.Description;
import jdk.jfr.Label;
import jdk.jfr.MetadataDefinition;
import jdk.jfr.Name;
import jdk.jfr.SettingDescriptor;
import jdk.jfr.Timespan;
import jdk.jfr.Timestamp;
import jdk.jfr.ValueDescriptor;
public final class TypeLibrary {
private static TypeLibrary instance;
private static final Map<Long, Type> types = new LinkedHashMap<>(100);
static final ValueDescriptor DURATION_FIELD = createDurationField();
static final ValueDescriptor THREAD_FIELD = createThreadField();
static final ValueDescriptor STACK_TRACE_FIELD = createStackTraceField();
static final ValueDescriptor START_TIME_FIELD = createStartTimeField();
private TypeLibrary(List<Type> jvmTypes) {
visitReachable(jvmTypes, t -> !types.containsKey(t.getId()), t -> types.put(t.getId(), t));
if (Logger.shouldLog(LogTag.JFR_SYSTEM_METADATA, LogLevel.INFO)) {
Stream<Type> s = types.values().stream().sorted((x, y) -> Long.compare(x.getId(), y.getId()));
s.forEach(t -> t.log("Added", LogTag.JFR_SYSTEM_METADATA, LogLevel.INFO));
}
}
private static ValueDescriptor createStartTimeField() {
List<AnnotationElement> annos = createStandardAnnotations("Start Time", null);
annos.add(new jdk.jfr.AnnotationElement(Timestamp.class, Timestamp.TICKS));
return PrivateAccess.getInstance().newValueDescriptor(EventInstrumentation.FIELD_START_TIME, Type.LONG, annos, 0, false,
EventInstrumentation.FIELD_START_TIME);
}
private static ValueDescriptor createStackTraceField() {
List<AnnotationElement> annos = new ArrayList<>();
annos = createStandardAnnotations("Stack Trace", "Stack Trace starting from the method the event was committed in");
return PrivateAccess.getInstance().newValueDescriptor(EventInstrumentation.FIELD_STACK_TRACE, Type.STACK_TRACE, annos, 0, true,
EventInstrumentation.FIELD_STACK_TRACE);
}
private static ValueDescriptor createThreadField() {
List<AnnotationElement> annos = new ArrayList<>();
annos = createStandardAnnotations("Event Thread", "Thread in which event was committed in");
return PrivateAccess.getInstance().newValueDescriptor(EventInstrumentation.FIELD_EVENT_THREAD, Type.THREAD, annos, 0, true,
EventInstrumentation.FIELD_EVENT_THREAD);
}
private static ValueDescriptor createDurationField() {
List<AnnotationElement> annos = new ArrayList<>();
annos = createStandardAnnotations("Duration", null);
annos.add(new jdk.jfr.AnnotationElement(Timespan.class, Timespan.TICKS));
return PrivateAccess.getInstance().newValueDescriptor(EventInstrumentation.FIELD_DURATION, Type.LONG, annos, 0, false, EventInstrumentation.FIELD_DURATION);
}
public static TypeLibrary getInstance() {
synchronized (TypeLibrary.class) {
if (instance == null) {
List<Type> jvmTypes;
try {
jvmTypes = MetadataHandler.createTypes();
Collections.sort(jvmTypes, (a,b) -> Long.compare(a.getId(), b.getId()));
} catch (IOException e) {
throw new Error("JFR: Could not read metadata");
}
instance = new TypeLibrary(jvmTypes);
}
return instance;
}
}
public List<Type> getTypes() {
return new ArrayList<>(types.values());
}
public static Type createAnnotationType(Class<? extends Annotation> a) {
if (shouldPersist(a)) {
Type type = defineType(a, Type.SUPER_TYPE_ANNOTATION, false);
if (type != null) {
SecuritySupport.makeVisibleToJFR(a);
for (Method method : a.getDeclaredMethods()) {
type.add(PrivateAccess.getInstance().newValueDescriptor(method.getReturnType(), method.getName()));
}
ArrayList<AnnotationElement> aes = new ArrayList<>();
for (Annotation annotation : resolveRepeatedAnnotations(a.getAnnotations())) {
AnnotationElement ae = createAnnotation(annotation);
if (ae != null) {
aes.add(ae);
}
}
aes.trimToSize();
type.setAnnotations(aes);
}
return getType(a);
}
return null;
}
static AnnotationElement createAnnotation(Annotation annotation) {
Class<? extends Annotation> annotationType = annotation.annotationType();
Type type = createAnnotationType(annotationType);
if (type != null) {
List<Object> values = new ArrayList<>();
for (ValueDescriptor v : type.getFields()) {
values.add(invokeAnnotation(annotation, v.getName()));
}
return PrivateAccess.getInstance().newAnnotation(type, values, annotation.annotationType().getClassLoader() == null);
}
return null;
}
private static Object invokeAnnotation(Annotation annotation, String methodName) {
final Method m;
try {
m = annotation.getClass().getMethod(methodName, new Class<?>[0]);
} catch (NoSuchMethodException e1) {
throw (Error) new InternalError("Could not loacate method " + methodName + " in annotation " + annotation.getClass().getName());
}
SecuritySupport.setAccessible(m);
try {
return m.invoke(annotation, new Object[0]);
} catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
throw (Error) new InternalError("Could not get value for method " + methodName + " in annotation " + annotation.getClass().getName());
}
}
private static boolean shouldPersist(Class<? extends Annotation> a) {
if (a == MetadataDefinition.class || a.getAnnotation(MetadataDefinition.class) == null) {
return false;
}
return true;
}
private static boolean isDefined(Class<?> clazz) {
return types.containsKey(Type.getTypeId(clazz));
}
private static Type getType(Class<?> clazz) {
return types.get(Type.getTypeId(clazz));
}
private static Type defineType(Class<?> clazz, String superType, boolean eventType) {
if (!isDefined(clazz)) {
Name name = clazz.getAnnotation(Name.class);
String typeName = name != null ? name.value() : clazz.getName();
long id = Type.getTypeId(clazz);
Type t;
if (eventType) {
t = new PlatformEventType(typeName, id, clazz.getClassLoader() == null, true);
} else {
t = new Type(typeName, superType, id);
}
types.put(t.getId(), t);
return t;
}
return null;
}
public static Type createType(Class<?> clazz) {
return createType(clazz, Collections.emptyList(), Collections.emptyList());
}
public static Type createType(Class<?> clazz, List<AnnotationElement> dynamicAnnotations, List<ValueDescriptor> dynamicFields) {
if (Thread.class == clazz) {
return Type.THREAD;
}
if (Class.class.isAssignableFrom(clazz)) {
return Type.CLASS;
}
if (String.class.equals(clazz)) {
return Type.STRING;
}
if (isDefined(clazz)) {
return getType(clazz);
}
if (clazz.isPrimitive()) {
return defineType(clazz, null,false);
}
if (clazz.isArray()) {
throw new InternalError("Arrays not supported");
}
// STRUCT
String superType = null;
boolean eventType = false;
if (jdk.internal.event.Event.class.isAssignableFrom(clazz)) {
superType = Type.SUPER_TYPE_EVENT;
eventType= true;
}
if (Control.class.isAssignableFrom(clazz)) {
superType = Type.SUPER_TYPE_SETTING;
}
// forward declare to avoid infinite recursion
defineType(clazz, superType, eventType);
Type type = getType(clazz);
if (eventType) {
addImplicitFields(type, true, true, true, true ,false);
addUserFields(clazz, type, dynamicFields);
type.trimFields();
}
addAnnotations(clazz, type, dynamicAnnotations);
if (clazz.getClassLoader() == null) {
type.log("Added", LogTag.JFR_SYSTEM_METADATA, LogLevel.INFO);
} else {
type.log("Added", LogTag.JFR_METADATA, LogLevel.INFO);
}
return type;
}
private static void addAnnotations(Class<?> clazz, Type type, List<AnnotationElement> dynamicAnnotations) {
ArrayList<AnnotationElement> aes = new ArrayList<>();
if (dynamicAnnotations.isEmpty()) {
for (Annotation a : Utils.getAnnotations(clazz)) {
AnnotationElement ae = createAnnotation(a);
if (ae != null) {
aes.add(ae);
}
}
} else {
List<Type> newTypes = new ArrayList<>();
aes.addAll(dynamicAnnotations);
for (AnnotationElement ae : dynamicAnnotations) {
newTypes.add(PrivateAccess.getInstance().getType(ae));
}
addTypes(newTypes);
}
type.setAnnotations(aes);
aes.trimToSize();
}
private static void addUserFields(Class<?> clazz, Type type, List<ValueDescriptor> dynamicFields) {
Map<String, ValueDescriptor> dynamicFieldSet = new HashMap<>();
for (ValueDescriptor dynamicField : dynamicFields) {
dynamicFieldSet.put(dynamicField.getName(), dynamicField);
}
List<Type> newTypes = new ArrayList<>();
for (Field field : Utils.getVisibleEventFields(clazz)) {
ValueDescriptor vd = dynamicFieldSet.get(field.getName());
if (vd != null) {
if (!vd.getTypeName().equals(field.getType().getName())) {
throw new InternalError("Type expected to match for field " + vd.getName() + " expected " + field.getName() + " but got " + vd.getName());
}
for (AnnotationElement ae : vd.getAnnotationElements()) {
newTypes.add(PrivateAccess.getInstance().getType(ae));
}
newTypes.add(PrivateAccess.getInstance().getType(vd));
} else {
vd = createField(field);
}
if (vd != null) {
type.add(vd);
}
}
addTypes(newTypes);
}
// By convention all events have these fields.
static void addImplicitFields(Type type, boolean requestable, boolean hasDuration, boolean hasThread, boolean hasStackTrace, boolean hasCutoff) {
createAnnotationType(Timespan.class);
createAnnotationType(Timestamp.class);
createAnnotationType(Label.class);
defineType(long.class, null,false);
addFields(type, requestable, hasDuration, hasThread, hasStackTrace, hasCutoff);
}
private static void addFields(Type type, boolean requestable, boolean hasDuration, boolean hasThread, boolean hasStackTrace, boolean hasCutoff) {
type.add(START_TIME_FIELD);
if (hasDuration || hasCutoff) {
type.add(DURATION_FIELD);
}
if (hasThread) {
type.add(THREAD_FIELD);
}
if (hasStackTrace) {
type.add(STACK_TRACE_FIELD);
}
}
private static List<AnnotationElement> createStandardAnnotations(String name, String description) {
List<AnnotationElement> annotationElements = new ArrayList<>(2);
annotationElements.add(new jdk.jfr.AnnotationElement(Label.class, name));
if (description != null) {
annotationElements.add(new jdk.jfr.AnnotationElement(Description.class, description));
}
return annotationElements;
}
private static ValueDescriptor createField(Field field) {
int mod = field.getModifiers();
if (Modifier.isTransient(mod)) {
return null;
}
if (Modifier.isStatic(mod)) {
return null;
}
Class<?> fieldType = field.getType();
if (!Type.isKnownType(fieldType)) {
return null;
}
boolean constantPool = Thread.class == fieldType || fieldType == Class.class;
Type type = createType(fieldType);
String fieldName = field.getName();
Name name = field.getAnnotation(Name.class);
String useName = fieldName;
if (name != null) {
useName = name.value();
}
List<jdk.jfr.AnnotationElement> ans = new ArrayList<>();
for (Annotation a : resolveRepeatedAnnotations(field.getAnnotations())) {
AnnotationElement ae = createAnnotation(a);
if (ae != null) {
ans.add(ae);
}
}
return PrivateAccess.getInstance().newValueDescriptor(useName, type, ans, 0, constantPool, fieldName);
}
private static List<Annotation> resolveRepeatedAnnotations(Annotation[] annotations) {
List<Annotation> annos = new ArrayList<>(annotations.length);
for (Annotation a : annotations) {
boolean repeated = false;
Method m;
try {
m = a.annotationType().getMethod("value");
Class<?> returnType = m.getReturnType();
if (returnType.isArray()) {
Class<?> ct = returnType.getComponentType();
if (Annotation.class.isAssignableFrom(ct) && ct.getAnnotation(Repeatable.class) != null) {
Object res = m.invoke(a, new Object[0]);
if (res != null && Annotation[].class.isAssignableFrom(res.getClass())) {
for (Annotation rep : (Annotation[]) m.invoke(a, new Object[0])) {
annos.add(rep);
}
repeated = true;
}
}
}
} catch (NoSuchMethodException | SecurityException | IllegalAccessException | IllegalArgumentException | InvocationTargetException e) {
// Ignore, can't access repeatable information
}
if (!repeated) {
annos.add(a);
}
}
return annos;
}
// Purpose of this method is to mark types that are reachable
// from registered event types. Those types that are not reachable can
// safely be removed
// Returns true if type was removed
public boolean clearUnregistered() {
Logger.log(LogTag.JFR_METADATA, LogLevel.TRACE, "Cleaning out obsolete metadata");
List<Type> registered = new ArrayList<>();
for (Type type : types.values()) {
if (type instanceof PlatformEventType) {
if (((PlatformEventType) type).isRegistered()) {
registered.add(type);
}
}
}
visitReachable(registered, t -> t.getRemove(), t -> t.setRemove(false));
List<Long> removeIds = new ArrayList<>();
for (Type type : types.values()) {
if (type.getRemove() && !Type.isDefinedByJVM(type.getId())) {
removeIds.add(type.getId());
if (Logger.shouldLog(LogTag.JFR_METADATA, LogLevel.TRACE)) {
Logger.log(LogTag.JFR_METADATA, LogLevel.TRACE, "Removed obsolete metadata " + type.getName());
}
}
// Optimization, set to true now to avoid iterating
// types first thing at next call to clearUnregistered
type.setRemove(true);
}
for (Long id : removeIds) {
types.remove(id);
}
return !removeIds.isEmpty();
}
public void addType(Type type) {
addTypes(Collections.singletonList(type));
}
/**代码未完, 请加载全部代码(NowJava.com).**/
关注时代Java
关注时代Java