| /** |
| * Copyright (C) 2006 Google 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 com.google.inject.struts2; |
| |
| import com.google.inject.AbstractModule; |
| import com.google.inject.Binder; |
| import com.google.inject.Guice; |
| import com.google.inject.Injector; |
| import com.google.inject.Module; |
| import com.google.inject.ScopeAnnotation; |
| import com.google.inject.servlet.ServletModule; |
| import com.opensymphony.xwork2.ActionInvocation; |
| import com.opensymphony.xwork2.ObjectFactory; |
| import com.opensymphony.xwork2.config.ConfigurationException; |
| import com.opensymphony.xwork2.config.entities.InterceptorConfig; |
| import com.opensymphony.xwork2.inject.Inject; |
| import com.opensymphony.xwork2.interceptor.Interceptor; |
| import java.lang.annotation.Annotation; |
| import java.util.ArrayList; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| import java.util.logging.Logger; |
| |
| public class GuiceObjectFactory extends ObjectFactory { |
| |
| static final Logger logger = |
| Logger.getLogger(GuiceObjectFactory.class.getName()); |
| |
| Module module; |
| volatile Injector injector; |
| boolean developmentMode = false; |
| List<ProvidedInterceptor> interceptors |
| = new ArrayList<ProvidedInterceptor>(); |
| |
| @Override |
| public boolean isNoArgConstructorRequired() { |
| return false; |
| } |
| |
| @Inject(value = "guice.module", required = false) |
| void setModule(String moduleClassName) { |
| try { |
| // Instantiate user's module. |
| @SuppressWarnings({"unchecked"}) |
| Class<? extends Module> moduleClass = |
| (Class<? extends Module>) Class.forName(moduleClassName); |
| this.module = moduleClass.newInstance(); |
| } catch (Exception e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @Inject(value = "struts.devMode", required = false) |
| void setDevelopmentMode(String developmentMode) { |
| this.developmentMode = developmentMode.trim().equals("true"); |
| } |
| |
| Set<Class<?>> boundClasses = new HashSet<Class<?>>(); |
| |
| public Class getClassInstance(String name) throws ClassNotFoundException { |
| Class<?> clazz = super.getClassInstance(name); |
| |
| synchronized (this) { |
| if (injector == null) { |
| // We can only bind each class once. |
| if (!boundClasses.contains(clazz)) { |
| try { |
| // Calling these methods now helps us detect ClassNotFoundErrors |
| // early. |
| clazz.getDeclaredFields(); |
| clazz.getDeclaredMethods(); |
| |
| boundClasses.add(clazz); |
| } catch (Throwable t) { |
| // Struts should still work even though some classes aren't in the |
| // classpath. It appears we always get the exception here when |
| // this is the case. |
| return clazz; |
| } |
| } |
| } |
| } |
| |
| return clazz; |
| } |
| |
| @SuppressWarnings("unchecked") |
| public Object buildBean(Class clazz, Map extraContext) { |
| if (injector == null) { |
| synchronized (this) { |
| if (injector == null) { |
| createInjector(); |
| } |
| } |
| } |
| |
| return injector.getInstance(clazz); |
| } |
| |
| private void createInjector() { |
| try { |
| logger.info("Creating injector..."); |
| this.injector = Guice.createInjector(new AbstractModule() { |
| protected void configure() { |
| // Install default servlet bindings. |
| install(new ServletModule()); |
| |
| // Install user's module. |
| if (module != null) { |
| logger.info("Installing " + module + "..."); |
| install(module); |
| } |
| else { |
| logger.info("No module found. Set 'guice.module' to a Module " |
| + "class name if you'd like to use one."); |
| } |
| |
| // Tell the injector about all the action classes, etc., so it |
| // can validate them at startup. |
| for (Class<?> boundClass : boundClasses) { |
| // TODO: Set source from Struts XML. |
| bind(boundClass); |
| } |
| |
| // Validate the interceptor class. |
| for (ProvidedInterceptor interceptor : interceptors) { |
| interceptor.validate(binder()); |
| } |
| } |
| }); |
| |
| // Inject interceptors. |
| for (ProvidedInterceptor interceptor : interceptors) { |
| interceptor.inject(); |
| } |
| |
| } catch (Throwable t) { |
| t.printStackTrace(); |
| System.exit(1); |
| } |
| logger.info("Injector created successfully."); |
| } |
| |
| @SuppressWarnings("unchecked") |
| public Interceptor buildInterceptor(InterceptorConfig interceptorConfig, |
| Map interceptorRefParams) throws ConfigurationException { |
| // Ensure the interceptor class is present. |
| Class<? extends Interceptor> interceptorClass; |
| try { |
| interceptorClass = getClassInstance(interceptorConfig.getClassName()); |
| } catch (ClassNotFoundException e) { |
| throw new RuntimeException(e); |
| } |
| |
| ProvidedInterceptor providedInterceptor = new ProvidedInterceptor( |
| interceptorConfig, interceptorRefParams, interceptorClass); |
| interceptors.add(providedInterceptor); |
| return providedInterceptor; |
| } |
| |
| Interceptor superBuildInterceptor(InterceptorConfig interceptorConfig, |
| Map interceptorRefParams) throws ConfigurationException { |
| return super.buildInterceptor(interceptorConfig, interceptorRefParams); |
| } |
| |
| class ProvidedInterceptor implements Interceptor { |
| |
| final InterceptorConfig config; |
| final Map params; |
| final Class<? extends Interceptor> interceptorClass; |
| Interceptor delegate; |
| |
| ProvidedInterceptor(InterceptorConfig config, Map params, |
| Class<? extends Interceptor> interceptorClass) { |
| this.config = config; |
| this.params = params; |
| this.interceptorClass = interceptorClass; |
| } |
| |
| void validate(Binder binder) { |
| // TODO: Set source from Struts XML. |
| if (hasScope(interceptorClass)) { |
| binder.addError("Scoping interceptors is not currently supported." |
| + " Please remove the scope annotation from " |
| + interceptorClass.getName() + "."); |
| } |
| |
| // Make sure it implements Interceptor. |
| if (!Interceptor.class.isAssignableFrom(interceptorClass)) { |
| binder.addError(interceptorClass.getName() + " must implement " |
| + Interceptor.class.getName() + "."); |
| } |
| } |
| |
| void inject() { |
| delegate = superBuildInterceptor(config, params); |
| } |
| |
| public void destroy() { |
| delegate.destroy(); |
| } |
| |
| public void init() { |
| throw new AssertionError(); |
| } |
| |
| public String intercept(ActionInvocation invocation) throws Exception { |
| return delegate.intercept(invocation); |
| } |
| } |
| |
| /** |
| * Returns true if the given class has a scope annotation. |
| */ |
| private static boolean hasScope( |
| Class<? extends Interceptor> interceptorClass) { |
| for (Annotation annotation : interceptorClass.getAnnotations()) { |
| if (annotation.annotationType() |
| .isAnnotationPresent(ScopeAnnotation.class)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| } |