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Caching inheritance hierarchy for a type to reduce performance impact of reflection.

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This commit is contained in:
Inderjeet Singh 2011-03-24 22:28:45 +00:00
parent 4a58dc3e2a
commit 4d9bec2206
1 changed files with 25 additions and 5 deletions
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30
gson/src/main/java/com/google/gson/ReflectingFieldNavigator.java
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@ -23,6 +23,8 @@ import com.google.gson.internal.Types;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.List;
/**
* Visits each of the fields of the specified class using reflection
@ -32,6 +34,8 @@ import java.lang.reflect.Type;
* @author Jesse Wilson
*/
final class ReflectingFieldNavigator {
private static final LruCache<Type, List<Class<?>>> classCache =
new LruCache<Type, List<Class<?>>>(500);
private static final LruCache<Class<?>, Field[]> fieldsCache =
new LruCache<Class<?>, Field[]>(500);
@ -52,14 +56,30 @@ final class ReflectingFieldNavigator {
void visitFieldsReflectively(ObjectTypePair objTypePair, Visitor visitor) {
ObjectTypePair currObjTypePair = objTypePair.toMoreSpecificType();
Class<?> topLevelClass = Types.getRawType(currObjTypePair.type);
for (Class<?> curr = topLevelClass; curr != null && !curr.equals(Object.class); curr =
curr.getSuperclass()) {
if (!curr.isSynthetic()) {
navigateClassFields(objTypePair.getObject(), objTypePair.type, curr, visitor);
}
for (Class<?> curr : getInheritanceHierarchy(currObjTypePair.type)) {
navigateClassFields(objTypePair.getObject(), objTypePair.type, curr, visitor);
}
}
/**
* Returns a list of classes corresponding to the inheritance of specified type
*/
private List<Class<?>> getInheritanceHierarchy(Type type) {
List<Class<?>> classes = classCache.get(type);
if (classes == null) {
classes = new ArrayList<Class<?>>();
Class<?> topLevelClass = Types.getRawType(type);
for (Class<?> curr = topLevelClass; curr != null && !curr.equals(Object.class); curr =
curr.getSuperclass()) {
if (!curr.isSynthetic()) {
classes.add(curr);
}
}
classCache.put(type, classes);
}
return classes;
}
private void navigateClassFields(Object obj, Type objType,
Class<?> classInInheritanceHierarchyForObj, Visitor visitor) {
Field[] fields = getFields(classInInheritanceHierarchyForObj);