/*
* Copyright 2011 JBoss, a divison Red Hat, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jboss.errai.ioc.rebind;
import static org.jboss.errai.ioc.rebind.ioc.InjectableInstance.getMethodInjectedInstance;
import static org.jboss.errai.ioc.rebind.ioc.InjectableInstance.getTypeInjectedInstance;
import java.lang.annotation.Annotation;
import java.lang.annotation.ElementType;
import java.lang.annotation.Target;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
import org.jboss.errai.bus.server.service.metadata.MetaDataScanner;
import org.jboss.errai.ioc.rebind.ioc.InjectableInstance;
import org.jboss.errai.ioc.rebind.ioc.InjectionFailure;
import org.jboss.errai.ioc.rebind.ioc.Injector;
import org.jboss.errai.ioc.rebind.ioc.InjectorFactory;
import org.jboss.errai.ioc.rebind.ioc.codegen.meta.MetaClass;
import org.jboss.errai.ioc.rebind.ioc.codegen.meta.MetaClassFactory;
import org.jboss.errai.ioc.rebind.ioc.codegen.meta.MetaField;
import org.jboss.errai.ioc.rebind.ioc.codegen.meta.MetaMethod;
public class IOCProcessorFactory {
private SortedSet<ProcessingEntry> processingEntries = new TreeSet<ProcessingEntry>();
private InjectorFactory injectorFactory;
public IOCProcessorFactory(InjectorFactory factory) {
this.injectorFactory = factory;
}
public void registerHandler(Class<? extends Annotation> annotation, AnnotationHandler handler) {
processingEntries.add(new ProcessingEntry(annotation, handler));
}
public void registerHandler(Class<? extends Annotation> annotation, AnnotationHandler handler, List<RuleDef> rules) {
processingEntries.add(new ProcessingEntry(annotation, handler, rules));
}
@SuppressWarnings({"unchecked"})
public void process(final MetaDataScanner scanner, final IOCProcessingContext context) {
/**
* Let's accumulate all the processing tasks.
*/
for (final ProcessingEntry entry : processingEntries) {
Class<? extends Annotation> aClass = entry.annotationClass;
Target target = aClass.getAnnotation(Target.class);
for (ElementType elementType : target.value()) {
switch (elementType) {
case TYPE: {
Set<Class<?>> classes = scanner.getTypesAnnotatedWith(aClass, context.getPackageFilter());
for (final Class<?> clazz : classes) {
if (clazz.getPackage().getName().contains("server")) {
continue;
}
final Annotation aInstance = clazz.getAnnotation(aClass);
entry.addProcessingDelegate(new ProcessingDelegate<MetaClass>() {
@Override
public boolean process() {
final MetaClass type = MetaClassFactory.get(clazz);
injectorFactory.addType(type);
Injector injector = injectorFactory.getInjectionContext().getInjector(type);
final InjectableInstance injectableInstance
= getTypeInjectedInstance(aInstance, type, injector, injectorFactory.getInjectionContext());
return entry.handler.handle(injectableInstance, aInstance, context);
}
public String toString() {
return clazz.getName();
}
});
}
}
break;
case METHOD: {
Set<Method> methods = scanner.getMethodsAnnotatedWith(aClass, context.getPackageFilter());
for (Method method : methods) {
final Annotation aInstance = method.getAnnotation(aClass);
final MetaClass type = MetaClassFactory.get(method.getDeclaringClass());
final MetaMethod metaMethod = MetaClassFactory.get(method);
entry.addProcessingDelegate(new ProcessingDelegate<MetaField>() {
@Override
public boolean process() {
injectorFactory.addType(type);
Injector injector = injectorFactory.getInjectionContext().getInjector(type);
final InjectableInstance injectableInstance
= getMethodInjectedInstance(aInstance, metaMethod, injector,
injectorFactory.getInjectionContext());
return entry.handler.handle(injectableInstance, aInstance, context);
}
public String toString() {
return type.getFullyQualifiedName();
}
});
}
}
case FIELD: {
Set<Field> fields = scanner.getFieldsAnnotatedWith(aClass, context.getPackageFilter());
for (Field method : fields) {
final Annotation aInstance = method.getAnnotation(aClass);
final MetaClass type = MetaClassFactory.get(method.getDeclaringClass());
final MetaField metaField = MetaClassFactory.get(method);
entry.addProcessingDelegate(new ProcessingDelegate<MetaField>() {
@Override
public boolean process() {
injectorFactory.addType(type);
Injector injector = injectorFactory.getInjectionContext().getInjector(type);
final InjectableInstance injectableInstance
= InjectableInstance.getFieldInjectedInstance(aInstance, metaField, injector,
injectorFactory.getInjectionContext());
return entry.handler.handle(injectableInstance, aInstance, context);
}
public String toString() {
return type.getFullyQualifiedName();
}
});
}
}
}
}
}
}
public boolean processAll() {
int start;
List<ProcessingEntry> procEntries = new ArrayList<ProcessingEntry>(processingEntries);
// The logic below processes the procEntries list in multiple passes, because the entries
// are not ordered according to their dependencies.
// TODO we should consider replacing this logic by applying an a priori topological sort for processing entries.
do {
start = procEntries.size();
Iterator<ProcessingEntry> iter = procEntries.iterator();
while (iter.hasNext()) {
try {
if (iter.next().processAllDelegates()) {
iter.remove();
}
}
catch (InjectionFailure f) {
// We are ignoring this Exception and keep retrying. The problem should go away after
// all the other dependencies have been processed.
}
}
} while (!procEntries.isEmpty() && procEntries.size() < start);
if (!procEntries.isEmpty()) {
throw new RuntimeException("unresolved dependencies: " + processingEntries);
}
return true;
}
private class ProcessingEntry<T> implements Comparable<ProcessingEntry> {
private Class<? extends Annotation> annotationClass;
private AnnotationHandler handler;
private Set<RuleDef> rules;
private List<ProcessingDelegate<T>> targets = new ArrayList<ProcessingDelegate<T>>();
private ProcessingEntry(Class<? extends Annotation> annotationClass, AnnotationHandler handler) {
this.annotationClass = annotationClass;
this.handler = handler;
}
private ProcessingEntry(Class<? extends Annotation> annotationClass, AnnotationHandler handler,
List<RuleDef> rule) {
this.annotationClass = annotationClass;
this.handler = handler;
this.rules = new HashSet<RuleDef>(rule);
}
public boolean processAllDelegates() {
int start;
do {
start = targets.size();
Iterator<ProcessingDelegate<T>> iterator = targets.iterator();
while (iterator.hasNext()) {
try {
if (iterator.next().process()) {
iterator.remove();
}
} catch (InjectionFailure f) {
// Ignored, see processAll()
}
}
} while (!targets.isEmpty() && targets.size() < start);
return targets.isEmpty();
}
public void addProcessingDelegate(ProcessingDelegate<T> delegate) {
targets.add(delegate);
}
@Override
public int compareTo(ProcessingEntry processingEntry) {
if (rules != null) {
for (RuleDef def : rules) {
if (!def.relAnnotation.equals(annotationClass)) {
continue;
}
switch (def.order) {
case After:
return 1;
case Before:
return -1;
}
}
}
else if (processingEntry.rules != null) {
for (RuleDef def : (Set<RuleDef>) processingEntry.rules) {
if (!def.relAnnotation.equals(annotationClass)) {
continue;
}
switch (def.order) {
case After:
return -1;
case Before:
return 1;
}
}
}
return -1;
}
public String toString() {
return "Scope:" + annotationClass.getName() + "(" + targets.toString() + "):\n" + targets;
}
}
static class RuleDef {
private Class<? extends Annotation> relAnnotation;
private RelativeOrder order;
RuleDef(Class<? extends Annotation> relAnnotation, RelativeOrder order) {
this.relAnnotation = relAnnotation;
this.order = order;
}
}
private static interface ProcessingDelegate<T> {
public boolean process();
}
}