Java tutorial
/* * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER. * * Copyright (c) 2013-2014 Oracle and/or its affiliates. All rights reserved. * * The contents of this file are subject to the terms of either the GNU * General Public License Version 2 only ("GPL") or the Common Development * and Distribution License("CDDL") (collectively, the "License"). You * may not use this file except in compliance with the License. You can * obtain a copy of the License at * http://glassfish.java.net/public/CDDL+GPL_1_1.html * or packager/legal/LICENSE.txt. 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However, if you add GPL Version 2 code * and therefore, elected the GPL Version 2 license, then the option applies * only if the new code is made subject to such option by the copyright * holder. */ package nl.jeslee.jersey.server.spring; import java.util.Set; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.ServletContext; import org.glassfish.hk2.api.DynamicConfiguration; import org.glassfish.hk2.api.Factory; import org.glassfish.hk2.api.ServiceLocator; import org.glassfish.hk2.utilities.ServiceLocatorUtilities; import org.glassfish.hk2.utilities.binding.ServiceBindingBuilder; import org.glassfish.jersey.internal.inject.Injections; import org.glassfish.jersey.server.ApplicationHandler; import org.glassfish.jersey.server.spi.ComponentProvider; import org.jvnet.hk2.spring.bridge.api.SpringBridge; import org.jvnet.hk2.spring.bridge.api.SpringIntoHK2Bridge; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.core.annotation.AnnotationUtils; import org.springframework.stereotype.Component; import org.springframework.web.context.support.WebApplicationContextUtils; /** * Custom ComponentProvider class. * Responsible for 1) bootstrapping Jersey 2 Spring integration and * 2) making Jersey skip JAX-RS Spring component life-cycle management and leave it to us. * * @author Marko Asplund (marko.asplund at yahoo.com) */ public class SpringComponentProvider implements ComponentProvider { private static final Logger LOGGER = Logger.getLogger(SpringComponentProvider.class.getName()); private static final String DEFAULT_CONTEXT_CONFIG_LOCATION = "applicationContext.xml"; private static final String PARAM_CONTEXT_CONFIG_LOCATION = "contextConfigLocation"; private static final String PARAM_SPRING_CONTEXT = "contextConfig"; private volatile ServiceLocator locator; private volatile ApplicationContext ctx; @Override public void initialize(ServiceLocator locator) { this.locator = locator; if (LOGGER.isLoggable(Level.FINE)) { LOGGER.fine(LocalizationMessages.CTX_LOOKUP_STARTED()); } ServletContext sc = locator.getService(ServletContext.class); if (sc != null) { // servlet container ctx = WebApplicationContextUtils.getWebApplicationContext(sc); } else { // non-servlet container ctx = createSpringContext(); } if (ctx == null) { LOGGER.severe(LocalizationMessages.CTX_LOOKUP_FAILED()); return; } LOGGER.config(LocalizationMessages.CTX_LOOKUP_SUCESSFUL()); // initialize HK2 spring-bridge SpringBridge.getSpringBridge().initializeSpringBridge(locator); SpringIntoHK2Bridge springBridge = locator.getService(SpringIntoHK2Bridge.class); springBridge.bridgeSpringBeanFactory(ctx); // register Spring @Autowired annotation handler with HK2 ServiceLocator ServiceLocatorUtilities.addOneConstant(locator, new AutowiredInjectResolver(ctx)); ServiceLocatorUtilities.addOneConstant(locator, ctx, "SpringContext", ApplicationContext.class); LOGGER.config(LocalizationMessages.SPRING_COMPONENT_PROVIDER_INITIALIZED()); } // detect JAX-RS classes that are also Spring @Components. // register these with HK2 ServiceLocator to manage their lifecycle using Spring. @Override public boolean bind(Class<?> component, Set<Class<?>> providerContracts) { if (ctx == null) { return false; } if (AnnotationUtils.findAnnotation(component, Component.class) != null) { DynamicConfiguration c = Injections.getConfiguration(locator); String[] beanNames = ctx.getBeanNamesForType(component); if (beanNames == null || beanNames.length != 1) { LOGGER.severe(LocalizationMessages.NONE_OR_MULTIPLE_BEANS_AVAILABLE(component)); return false; } String beanName = beanNames[0]; ServiceBindingBuilder bb = Injections .newFactoryBinder(new SpringComponentProvider.SpringManagedBeanFactory(ctx, locator, beanName)); bb.to(component); Injections.addBinding(bb, c); c.commit(); LOGGER.config(LocalizationMessages.BEAN_REGISTERED(beanName)); return true; } return false; } @Override public void done() { } private ApplicationContext createSpringContext() { ApplicationHandler applicationHandler = locator.getService(ApplicationHandler.class); ApplicationContext springContext = (ApplicationContext) applicationHandler.getConfiguration() .getProperty(PARAM_SPRING_CONTEXT); if (springContext == null) { String contextConfigLocation = (String) applicationHandler.getConfiguration() .getProperty(PARAM_CONTEXT_CONFIG_LOCATION); springContext = createXmlSpringConfiguration(contextConfigLocation); } return springContext; } private ApplicationContext createXmlSpringConfiguration(String contextConfigLocation) { if (contextConfigLocation == null) { contextConfigLocation = DEFAULT_CONTEXT_CONFIG_LOCATION; } return ctx = new ClassPathXmlApplicationContext(contextConfigLocation, "jersey-spring-applicationContext.xml"); } private static class SpringManagedBeanFactory implements Factory { private final ApplicationContext ctx; private final ServiceLocator locator; private final String beanName; private SpringManagedBeanFactory(ApplicationContext ctx, ServiceLocator locator, String beanName) { this.ctx = ctx; this.locator = locator; this.beanName = beanName; } @Override public Object provide() { Object bean = ctx.getBean(beanName); locator.inject(bean); return bean; } @Override public void dispose(Object instance) { } } }