| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.apache.polygene.runtime.bootstrap; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Modifier; |
| import java.lang.reflect.Type; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.apache.polygene.api.common.AppliesTo; |
| import org.apache.polygene.api.common.AppliesToFilter; |
| import org.apache.polygene.api.common.ConstructionException; |
| import org.apache.polygene.api.constraint.Constraint; |
| import org.apache.polygene.runtime.composite.ConcernModel; |
| import org.apache.polygene.runtime.composite.ConstraintDeclaration; |
| import org.apache.polygene.runtime.composite.FragmentClassLoader; |
| import org.apache.polygene.runtime.composite.MixinModel; |
| import org.apache.polygene.runtime.composite.SideEffectModel; |
| |
| import static org.apache.polygene.api.util.AccessibleObjects.accessible; |
| |
| /** |
| * This helper is used when building the application model. It keeps track |
| * of already created classloaders and various models |
| */ |
| @SuppressWarnings("WeakerAccess") |
| public class AssemblyHelper |
| { |
| private Map<Class, Class> instantiationClasses = new HashMap<>(); |
| private Map<Class, ConstraintDeclaration> constraintDeclarations = new HashMap<>(); |
| private Map<ClassLoader, FragmentClassLoader> modifierClassLoaders = new HashMap<>(); |
| private Map<Class<?>, AppliesToFilter> appliesToInstances = new HashMap<>(); |
| |
| protected MixinModel getMixinModel(Class mixinClass) |
| { |
| return new MixinModel( mixinClass, instantiationClass( mixinClass ) ); |
| } |
| |
| protected ConcernModel getConcernModel(Class concernClass) |
| { |
| return new ConcernModel( concernClass, instantiationClass( concernClass ) ); |
| } |
| |
| protected SideEffectModel getSideEffectModel(Class sideEffectClass) |
| { |
| return new SideEffectModel( sideEffectClass, instantiationClass( sideEffectClass ) ); |
| } |
| |
| protected Class instantiationClass(Class fragmentClass) |
| { |
| Class instantiationClass = fragmentClass; |
| if( !InvocationHandler.class.isAssignableFrom( fragmentClass ) ) |
| { |
| instantiationClass = instantiationClasses.get( fragmentClass ); |
| |
| if( instantiationClass == null ) |
| { |
| try |
| { |
| FragmentClassLoader fragmentLoader = getModifierClassLoader( fragmentClass.getClassLoader() ); |
| instantiationClass = fragmentLoader.loadFragmentClass( fragmentClass ); |
| instantiationClasses.put( fragmentClass, instantiationClass ); |
| } |
| catch( ClassNotFoundException | VerifyError e ) |
| { |
| throw new ConstructionException( "Could not generate mixin subclass " + fragmentClass.getName(), e ); |
| } |
| } |
| } |
| return instantiationClass; |
| } |
| |
| protected FragmentClassLoader getModifierClassLoader( ClassLoader classLoader ) |
| { |
| return modifierClassLoaders.computeIfAbsent( classLoader, k -> instantiateFragmentClassLoader( classLoader ) ); |
| } |
| |
| protected FragmentClassLoader instantiateFragmentClassLoader( ClassLoader classLoader ) |
| { |
| return new FragmentClassLoader( classLoader ); |
| } |
| |
| public boolean appliesTo( Class<?> fragmentClass, Method method, Iterable<Class<?>> types, Class<?> mixinClass ) |
| { |
| AppliesToFilter appliesToFilter = appliesToInstances.computeIfAbsent( fragmentClass, k -> createAppliesToFilter( fragmentClass ) ); |
| for( Class<?> compositeType : types ) |
| { |
| if( appliesToFilter.appliesTo( method, mixinClass, compositeType, fragmentClass ) ) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| protected AppliesToFilter createAppliesToFilter( Class<?> fragmentClass ) |
| { |
| AppliesToFilter result = null; |
| if( !InvocationHandler.class.isAssignableFrom( fragmentClass ) ) |
| { |
| result = new TypedFragmentAppliesToFilter(); |
| if( Modifier.isAbstract( fragmentClass.getModifiers() ) ) |
| { |
| result = new AndAppliesToFilter( result, new ImplementsMethodAppliesToFilter() ); |
| } |
| } |
| result = applyAppliesTo( result, fragmentClass ); |
| if( result == null ) |
| { |
| return AppliesToFilter.ALWAYS; |
| } |
| return result; |
| } |
| |
| protected AppliesToFilter applyAppliesTo( AppliesToFilter existing, Class<?> modifierClass ) |
| { |
| AppliesTo appliesTo = modifierClass.getAnnotation( AppliesTo.class ); |
| if( appliesTo != null ) |
| { |
| // Use "or" for all filters specified in the annotation |
| AppliesToFilter appliesToAnnotation = null; |
| for( Class<?> appliesToClass : appliesTo.value() ) |
| { |
| AppliesToFilter filter; |
| if( AppliesToFilter.class.isAssignableFrom( appliesToClass ) ) |
| { |
| try |
| { |
| @SuppressWarnings("unchecked") |
| Constructor<AppliesToFilter> cons = (Constructor<AppliesToFilter>) appliesToClass.getDeclaredConstructor(); |
| filter = accessible( cons ).newInstance(); |
| } |
| catch( Exception e ) |
| { |
| throw new ConstructionException( e ); |
| } |
| } |
| else if( Annotation.class.isAssignableFrom( appliesToClass ) ) |
| { |
| filter = new AnnotationAppliesToFilter( appliesToClass ); |
| } |
| else // Type check |
| { |
| filter = new TypeCheckAppliesToFilter( appliesToClass ); |
| } |
| |
| if( appliesToAnnotation == null ) |
| { |
| appliesToAnnotation = filter; |
| } |
| else |
| { |
| appliesToAnnotation = new OrAppliesToFilter( appliesToAnnotation, filter ); |
| } |
| } |
| // Add to the rest of the rules using "and" |
| if( existing == null ) |
| { |
| return appliesToAnnotation; |
| } |
| else |
| { |
| return new AndAppliesToFilter( existing, appliesToAnnotation ); |
| } |
| } |
| return existing; |
| } |
| |
| public boolean appliesTo( Class<? extends Constraint<?, ?>> constraint, |
| Class<? extends Annotation> annotationType, |
| Type valueType |
| ) |
| { |
| ConstraintDeclaration constraintDeclaration = |
| constraintDeclarations.computeIfAbsent( constraint, k -> new ConstraintDeclaration( constraint ) ); |
| return constraintDeclaration.appliesTo( annotationType, valueType ); |
| } |
| } |