public void init(WebApp wapp) throws Exception {
if (DHtmlUpdateServlet.getAuExtension(wapp, URI_PREFIX) == null) {
try {
DHtmlUpdateServlet.addAuExtension(wapp, URI_PREFIX, this);
} catch (Throwable ex) {
log.error("could not initialize AuRedirect extension", ex);
throw new IllegalStateException("could not initialize AuRedirect extension", ex);
}
}
}
/**
* Returns the AU extension that is associated the specified prefix.
*
* @since 5.0.0
*/
public static final AuExtension getAuExtension(WebApp wapp, String prefix) {
DHtmlUpdateServlet upsv = DHtmlUpdateServlet.getUpdateServlet(wapp);
if (upsv == null) {
synchronized (DHtmlUpdateServlet.class) {
upsv = DHtmlUpdateServlet.getUpdateServlet(wapp);
if (upsv == null) {
Map aues = (Map) wapp.getAttribute(ATTR_AU_PROCESSORS);
return aues != null ? (AuExtension) aues.get(prefix) : null;
}
}
}
return upsv.getAuExtension(prefix);
}
/**
* Adds an AU extension and associates it with the specified prefix, even before {@link
* DHtmlUpdateServlet} is started.
*
* <p>Unlike {@link #addAuExtension(String, AuExtension)}, it can be called even if the update
* servlet is not loaded yet ({@link #getUpdateServlet} returns null).
*
* <p>If there was an AU extension associated with the same name, the the old AU extension will be
* replaced.
*
* @since 5.0.0
*/
public static final AuExtension addAuExtension(WebApp wapp, String prefix, AuExtension extension)
throws ServletException {
DHtmlUpdateServlet upsv = DHtmlUpdateServlet.getUpdateServlet(wapp);
if (upsv == null) {
synchronized (DHtmlUpdateServlet.class) {
upsv = DHtmlUpdateServlet.getUpdateServlet(wapp);
if (upsv == null) {
checkAuExtension(prefix, extension);
Map aues = (Map) wapp.getAttribute(ATTR_AU_PROCESSORS);
if (aues == null) wapp.setAttribute(ATTR_AU_PROCESSORS, aues = new HashMap(4));
return (AuExtension) aues.put(prefix, extension);
}
}
}
return upsv.addAuExtension(prefix, extension);
}
