| /******************************************************************************* |
| * Copyright (c) 2010, 2016 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.e4.core.internal.di; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| import java.lang.reflect.Type; |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| import org.eclipse.e4.core.di.IInjector; |
| import org.eclipse.e4.core.di.InjectionException; |
| import org.eclipse.e4.core.di.suppliers.IObjectDescriptor; |
| import org.eclipse.e4.core.di.suppliers.PrimaryObjectSupplier; |
| |
| public class MethodRequestor extends Requestor<Method> { |
| |
| /** |
| * The parameters annotation cache. Having a *static* map is valuable as it changes the hit rate from about 60% to about 90%. |
| */ |
| private static Map<Method, Annotation[][]> annotationCache = new WeakHashMap<Method, Annotation[][]>(); |
| |
| public MethodRequestor(Method method, IInjector injector, PrimaryObjectSupplier primarySupplier, PrimaryObjectSupplier tempSupplier, Object requestingObject, boolean track) { |
| super(method, injector, primarySupplier, tempSupplier, requestingObject, track); |
| } |
| |
| @Override |
| public Object execute() throws InjectionException { |
| if (actualArgs == null) { |
| if (location.getParameterTypes().length > 0) |
| return null; // optional method call |
| } |
| Object userObject = getRequestingObject(); |
| if (userObject == null) |
| return null; |
| Object result = null; |
| if (!location.isAccessible()) { |
| location.setAccessible(true); |
| } |
| boolean pausedRecording = false; |
| if ((primarySupplier != null)) { |
| primarySupplier.pauseRecording(); |
| pausedRecording = true; |
| } |
| try { |
| result = location.invoke(userObject, actualArgs); |
| } catch (IllegalArgumentException | IllegalAccessException e) { |
| throw new InjectionException(e); |
| } catch (InvocationTargetException e) { |
| Throwable originalException = e.getCause(); |
| // Errors such as ThreadDeath or OutOfMemoryError should not be trapped |
| // http://bugs.eclipse.org/bugs/show_bug.cgi?id=457687 |
| if (originalException instanceof Error) { |
| throw (Error) originalException; |
| } |
| throw new InjectionException((originalException != null) ? originalException : e); |
| } finally { |
| if (pausedRecording) |
| primarySupplier.resumeRecording(); |
| clearResolvedArgs(); |
| } |
| return result; |
| } |
| |
| @Override |
| protected IObjectDescriptor[] calcDependentObjects() { |
| Type[] parameterTypes = location.getGenericParameterTypes(); |
| Annotation[][] annotations = getParameterAnnotations(); |
| IObjectDescriptor[] descriptors = new IObjectDescriptor[parameterTypes.length]; |
| for (int i = 0; i < parameterTypes.length; i++) { |
| descriptors[i] = new ObjectDescriptor(parameterTypes[i], annotations[i]); |
| } |
| return descriptors; |
| } |
| |
| /** @return the annotations for each of the method parameters */ |
| public Annotation[][] getParameterAnnotations() { |
| // We don't synchronize annotationCache to avoid performance overhead. |
| // The code below should be fine non-synchronized; but this needs to be |
| // kept in mind if this method is updated. |
| Annotation[][] result = annotationCache.get(location); |
| if (result == null) { |
| result = location.getParameterAnnotations(); |
| annotationCache.put(location, result); |
| } |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| StringBuffer tmp = new StringBuffer(); |
| Object object = getRequestingObject(); |
| if (object != null) |
| tmp.append(object.getClass().getSimpleName()); |
| tmp.append('#'); |
| tmp.append(location.getName()); |
| tmp.append('('); |
| tmp.append(')'); |
| return tmp.toString(); |
| } |
| } |