org.glassfish.sse.impl.ServerSentEventCdiExtension Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of payara-micro Show documentation
Show all versions of payara-micro Show documentation
Micro Distribution of the Payara Project
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 2011-2012 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
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
* or packager/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at packager/legal/LICENSE.txt.
*
* GPL Classpath Exception:
* Oracle designates this particular file as subject to the "Classpath"
* exception as provided by Oracle in the GPL Version 2 section of the License
* file that accompanied this code.
*
* Modifications:
* If applicable, add the following below the License Header, with the fields
* enclosed by brackets [] replaced by your own identifying information:
* "Portions Copyright [year] [name of copyright owner]"
*
* Contributor(s):
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. 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 org.glassfish.sse.impl;
import org.glassfish.sse.api.*;
import javax.enterprise.context.ApplicationScoped;
import javax.enterprise.context.spi.CreationalContext;
import javax.enterprise.event.Observes;
import javax.enterprise.inject.spi.*;
import javax.enterprise.util.AnnotationLiteral;
import java.lang.annotation.Annotation;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.*;
import java.util.logging.Level;
import java.util.logging.Logger;
/**
* A CDI extension that creates ServerSentEventHandlerContext beans so that
* they can be injected into other EE components
*
* @author Jitendra Kotamraju
*/
public class ServerSentEventCdiExtension implements Extension {
private final Logger LOGGER = Logger.getLogger(ServerSentEventCdiExtension.class.getName());
// path --> application
private final Map applicationMap
= new HashMap();
public Map getApplicationMap() {
return applicationMap;
}
@SuppressWarnings("UnusedDeclaration")
void beforeBeanDiscovery(@Observes BeforeBeanDiscovery bbd, BeanManager bm) {
bbd.addQualifier(ServerSentEventContext.class);
}
@SuppressWarnings("ClassExplicitlyAnnotation")
static class WebHandlerContextAnnotationLiteral extends AnnotationLiteral implements ServerSentEventContext {
private final String path;
WebHandlerContextAnnotationLiteral(String path) {
this.path = path;
}
@Override
public String value() {
return path;
}
}
static class ServerSentEventHandlerContextBean implements Bean {
private final String path;
private final ServerSentEventHandlerContext instance;
private final Class handlerClass;
ServerSentEventHandlerContextBean(String path, ServerSentEventHandlerContext instance, Class handlerClass) {
this.path = path;
this.instance = instance;
this.handlerClass = handlerClass;
}
@Override
public Set getTypes() {
Set types = new HashSet();
types.add(new ParameterizedType() {
@Override
public Type[] getActualTypeArguments() {
return new Type[] {handlerClass};
}
@Override
public Type getRawType() {
return ServerSentEventHandlerContext.class;
}
@Override
public Type getOwnerType() {
return null;
}
});
return types;
}
@Override
public Set getQualifiers() {
Set qualifiers = new HashSet();
qualifiers.add(new WebHandlerContextAnnotationLiteral(path));
return qualifiers;
}
@Override
public Class getScope() {
return ApplicationScoped.class;
}
@Override
public String getName() {
return null;
}
@Override
public Set> getStereotypes() {
return Collections.emptySet();
}
@Override
public Class getBeanClass() {
return ServerSentEventHandlerContext.class;
}
@Override
public boolean isAlternative() {
return false;
}
@Override
public boolean isNullable() {
return false;
}
@Override
public Set getInjectionPoints() {
return Collections.emptySet();
}
@Override
public ServerSentEventHandlerContext create(CreationalContext context) {
return instance;
}
@Override
public void destroy(ServerSentEventHandlerContext instance, CreationalContext context) {
}
}
// For each ServerSentEvent hanlder, it creates a corresponding ServerSentHandlerContext
// This context can be got anywhere from BeanManager
@SuppressWarnings("UnusedDeclaration")
void afterBeanDiscovery(@Observes AfterBeanDiscovery bbd) {
for(Map.Entry entry : applicationMap.entrySet()) {
bbd.addBean(new ServerSentEventHandlerContextBean(entry.getKey(), entry.getValue().getHandlerContext(),
entry.getValue().getHandlerClass()));
}
}
@SuppressWarnings("UnusedDeclaration")
void processAnnotatedType(@Observes @WithAnnotations(ServerSentEvent.class) ProcessAnnotatedType pat,
BeanManager beanManager) {
if (LOGGER.isLoggable(Level.FINE)) {
LOGGER.fine("scanning type: " + pat.getAnnotatedType().getJavaClass().getName());
}
for (Annotation an : pat.getAnnotatedType().getAnnotations()) {
Class clazz = pat.getAnnotatedType().getJavaClass();
if (an instanceof ServerSentEvent) {
if (!ServerSentEventHandler.class.isAssignableFrom(clazz)) {
throw new RuntimeException("Invalid base class '"
+ clazz.getName() + "' for handler.");
}
ServerSentEvent wh = (ServerSentEvent) an;
String path = normalizePath(wh.value());
ServerSentEventApplication app = applicationMap.get(path);
if (app != null) {
throw new RuntimeException("Two ServerSentEvent handlers are mapped to same path="+path);
}
app = new ServerSentEventApplication(clazz, path);
applicationMap.put(path, app);
}
}
}
private String normalizePath(String path) {
path = path.trim();
return path.startsWith("/") ? path : "/" + path;
}
}