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/*
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*
* Copyright (c) 2011-2012 Oracle and/or its affiliates. All rights reserved.
*
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package org.glassfish.sse.impl;
import javax.servlet.ServletContainerInitializer;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;
import javax.servlet.annotation.HandlesTypes;
import java.util.*;
import org.glassfish.sse.api.*;
/**
* Registers a context listener to get ServletContext
*
* Registers a servlet dynamically if there are ServerSentEventHandlers in
* an application.
*
* @author Jitendra Kotamraju
*/
@HandlesTypes(ServerSentEvent.class)
public class ServerSentEventServletContainerInitializer implements ServletContainerInitializer {
public void onStartup(Set> set, ServletContext ctx) throws ServletException {
if (set == null || set.isEmpty()) {
return;
}
// Check if there is already a servlet for server sent events
Map registrations = ctx.getServletRegistrations();
for(ServletRegistration reg : registrations.values()) {
if (reg.getClass().equals(ServerSentEventServlet.class)) {
return;
}
}
// Collect all the url patterns for server sent event handlers
List urlPatternList = new ArrayList();
for(Class clazz : set) {
if (ServerSentEventHandler.class.isAssignableFrom(clazz)) {
ServerSentEvent handler = clazz.getAnnotation(ServerSentEvent.class);
if (handler == null) {
throw new RuntimeException("ServerSentEventHandler Class "+clazz+" doesn't have WebHandler annotation");
}
urlPatternList.add(handler.value());
}
}
// Register a servlet for all the url patterns of server sent event handler
if (!urlPatternList.isEmpty()) {
ServletRegistration.Dynamic reg = ctx.addServlet("sse servlet", ServerSentEventServlet.class);
reg.setAsyncSupported(true);
reg.addMapping(urlPatternList.toArray(new String[urlPatternList.size()]));
}
}
}