| /* |
| * 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.composite; |
| |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationHandler; |
| import java.lang.reflect.Method; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.stream.Stream; |
| import org.apache.polygene.api.common.ConstructionException; |
| import org.apache.polygene.api.common.MetaInfo; |
| import org.apache.polygene.api.common.Visibility; |
| import org.apache.polygene.api.composite.Composite; |
| import org.apache.polygene.api.composite.CompositeDescriptor; |
| import org.apache.polygene.api.constraint.ConstraintViolationException; |
| import org.apache.polygene.api.structure.ModuleDescriptor; |
| import org.apache.polygene.api.util.AccessibleObjects; |
| import org.apache.polygene.api.util.HierarchicalVisitor; |
| import org.apache.polygene.api.util.VisitableHierarchy; |
| import org.apache.polygene.runtime.injection.Dependencies; |
| import org.apache.polygene.runtime.injection.DependencyModel; |
| |
| import static java.lang.reflect.Proxy.newProxyInstance; |
| import static org.apache.polygene.api.composite.InvalidCompositeException.handleInvalidCompositeType; |
| |
| /** |
| * JAVADOC |
| */ |
| public abstract class CompositeModel |
| implements VisitableHierarchy<Object, Object>, Dependencies, CompositeDescriptor |
| { |
| protected final ModuleDescriptor module; |
| protected final MixinsModel mixinsModel; |
| protected final CompositeMethodsModel compositeMethodsModel; |
| protected final StateModel stateModel; |
| |
| private final Class<?> primaryType; |
| private final Set<Class<?>> types; |
| private final Visibility visibility; |
| private final MetaInfo metaInfo; |
| |
| private Class<? extends Composite> proxyClass; |
| private Constructor<? extends Composite> proxyConstructor; |
| |
| protected CompositeModel( final ModuleDescriptor module, |
| final List<Class<?>> types, |
| final Visibility visibility, |
| final MetaInfo metaInfo, |
| final MixinsModel mixinsModel, |
| final StateModel stateModel, |
| final CompositeMethodsModel compositeMethodsModel |
| ) |
| { |
| this.module = module; |
| this.types = new LinkedHashSet<>( types ); |
| this.visibility = visibility; |
| this.metaInfo = metaInfo; |
| this.stateModel = stateModel; |
| this.compositeMethodsModel = compositeMethodsModel; |
| this.mixinsModel = mixinsModel; |
| |
| // Create proxy class |
| @SuppressWarnings( "OptionalGetWithoutIsPresent" ) |
| Class<?> mainType = types.stream().findFirst().get(); |
| try |
| { |
| proxyClass = createProxyClass( mainType ); |
| proxyConstructor = createProxyConstructor( mainType ); |
| } |
| catch( ClassNotFoundException | NoSuchMethodException e ) |
| { |
| handleInvalidCompositeType( e.getMessage(), module, mainType, null, null, null, types ); |
| } |
| primaryType = mixinTypes() |
| .reduce( null, ( primary, type ) -> |
| { |
| if( primary == null ) |
| { |
| return type; |
| } |
| else if( primary.isAssignableFrom( type ) ) |
| { |
| return type; |
| } |
| return primary; |
| } ); |
| } |
| |
| @Override |
| public Stream<Class<?>> types() |
| { |
| return types.stream(); |
| } |
| |
| public StateModel state() |
| { |
| return stateModel; |
| } |
| |
| @Override |
| public <T> T metaInfo( Class<T> infoType ) |
| { |
| return metaInfo.get( infoType ); |
| } |
| |
| @Override |
| public Visibility visibility() |
| { |
| return visibility; |
| } |
| |
| @Override |
| public boolean isAssignableTo( Class<?> type ) |
| { |
| for( Class<?> aClass : types ) |
| { |
| if( type.isAssignableFrom( aClass ) ) |
| { |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| public MixinsModel mixinsModel() |
| { |
| return mixinsModel; |
| } |
| |
| @Override |
| @SuppressWarnings( { "raw", "unchecked" } ) |
| public Class<?> primaryType() |
| { |
| return primaryType; |
| } |
| |
| @Override |
| public Stream<Class<?>> mixinTypes() |
| { |
| return mixinsModel.mixinTypes(); |
| } |
| |
| @Override |
| public Stream<DependencyModel> dependencies() |
| { |
| Stream<Dependencies> models = Stream.of( this.mixinsModel, compositeMethodsModel ); |
| return models.flatMap( Dependencies::dependencies ); |
| } |
| |
| @Override |
| public <ThrowableType extends Throwable> boolean accept( HierarchicalVisitor<? super Object, ? super Object, ThrowableType> visitor ) |
| throws ThrowableType |
| { |
| if( visitor.visitEnter( this ) ) |
| { |
| if( compositeMethodsModel.accept( visitor ) ) |
| { |
| if( stateModel.accept( visitor ) ) |
| { |
| mixinsModel.accept( visitor ); |
| } |
| } |
| } |
| return visitor.visitLeave( this ); |
| } |
| |
| @SuppressWarnings( { "raw", "unchecked" } ) |
| private Class<? extends Composite> createProxyClass( Class<?> mainType ) |
| throws ClassNotFoundException, NoSuchMethodException |
| { |
| Class<? extends Composite> proxyClass; |
| if( mainType.isInterface() ) |
| { |
| ClassLoader proxyClassloader = mainType.getClassLoader(); |
| |
| Class<?>[] interfaces = types.stream().map( Class.class::cast ).toArray( Class[]::new ); |
| proxyClass = (Class<? extends Composite>) ProxyGenerator.createProxyClass( proxyClassloader, interfaces ); |
| } |
| else |
| { |
| proxyClass = new TransientClassLoader( getClass().getClassLoader() ).loadFragmentClass( mainType ); |
| } |
| return proxyClass; |
| } |
| |
| @SuppressWarnings( { "raw", "unchecked" } ) |
| private Constructor<? extends Composite> createProxyConstructor( Class<?> mainType ) |
| throws ClassNotFoundException, NoSuchMethodException |
| { |
| Constructor<? extends Composite> constructor; |
| if( mainType.isInterface() ) |
| { |
| constructor = proxyClass.getConstructor( InvocationHandler.class ); |
| } |
| else |
| { |
| constructor = (Constructor<? extends Composite>) proxyClass.getConstructors()[ 0 ]; |
| } |
| return AccessibleObjects.accessible( constructor ); |
| } |
| |
| // Context |
| public final Object invoke( MixinsInstance mixins, |
| Object proxy, |
| Method method, |
| Object[] args |
| ) |
| throws Throwable |
| { |
| try |
| { |
| try |
| { |
| return compositeMethodsModel.invoke( mixins, proxy, method, args, module ); |
| } |
| catch( ConstraintViolationException e ) |
| { |
| e.setCompositeDescriptor(this); |
| throw e; |
| } |
| } |
| catch( Throwable throwable ) |
| { |
| decorateModuleInfo( throwable, method.getName() ); |
| throw throwable; |
| } |
| } |
| |
| private void decorateModuleInfo( Throwable throwable, String methodName ) |
| { |
| StackTraceElement[] trace = throwable.getStackTrace(); |
| // Only add originating Module/Layer/ |
| if( trace[0].getClassName().startsWith( "method " )) |
| { |
| return; |
| } |
| StackTraceElement[] newTrace = new StackTraceElement[ trace.length + 1 ]; |
| String message = "method \"" + methodName + "\" of " + this.toString() + " in module [" + module.name() + "] of layer [" + module.layer().name() + "]"; |
| String compositeName = this.toString(); |
| newTrace[ 0 ] = new StackTraceElement( message, "", "", 0 ); |
| System.arraycopy( trace, 0, newTrace, 1, trace.length ); |
| throwable.setStackTrace( newTrace ); |
| } |
| |
| @Override |
| public ModuleDescriptor module() |
| { |
| return module; |
| } |
| |
| public Composite newProxy( InvocationHandler invocationHandler ) |
| throws ConstructionException |
| { |
| Class<?> mainType = types.stream().findFirst().get(); |
| if( mainType.isInterface() ) |
| { |
| try |
| { |
| return Composite.class.cast( proxyConstructor.newInstance( invocationHandler ) ); |
| } |
| catch( Exception e ) |
| { |
| throw new ConstructionException( e ); |
| } |
| } |
| else |
| { |
| try |
| { |
| Object[] args = new Object[ proxyConstructor.getParameterTypes().length ]; |
| Composite composite = Composite.class.cast( proxyConstructor.newInstance( args ) ); |
| proxyClass.getField( "_instance" ).set( composite, invocationHandler ); |
| return composite; |
| } |
| catch( Exception e ) |
| { |
| throw new ConstructionException( e ); |
| } |
| } |
| } |
| |
| @SuppressWarnings( "raw" ) |
| public <T> T newProxy( InvocationHandler invocationHandler, Class<T> mixinType ) |
| throws IllegalArgumentException |
| { |
| |
| if( !mixinsModel.isImplemented( mixinType ) ) |
| { |
| String message = "Composite " + primaryType().getName() + " does not implement type " + mixinType.getName(); |
| throw new IllegalArgumentException( message ); |
| } |
| |
| // Instantiate proxy for given mixin interface |
| return mixinType.cast( newProxyInstance( mixinType.getClassLoader(), new Class[]{ mixinType }, invocationHandler ) ); |
| } |
| |
| @Override |
| public String toString() |
| { |
| return primaryType.getSimpleName(); |
| } |
| } |