private void addCacheSessionListener(final String uuid) {
final ExternalContext.Session session =
NetUtils.getSession(XFormsStateManager.FORCE_SESSION_CREATION);
assert session != null;
final Map<String, Object> sessionAttributes =
session.getAttributesMap(ExternalContext.Session.APPLICATION_SCOPE);
final String listenerSessionKey = getListenerSessionKey(uuid);
if (sessionAttributes.get(listenerSessionKey) == null) {
// Remove from cache when session expires
final ExternalContext.Session.SessionListener listener =
new ExternalContext.Session.SessionListener() {
public void sessionDestroyed() {
indentedLogger.logDebug(
LOG_TYPE, "Removing document from cache following session expiration.");
// NOTE: This will call onRemoved() on the document, and onRemovedFromCache() on
// XFormsStateManager
XFormsDocumentCache.instance().removeDocument(uuid);
}
};
// Add listener
session.addListener(listener);
// Remember, in session, mapping (UUID -> session listener)
sessionAttributes.put(listenerSessionKey, listener);
}
}
/**
* Add listener to fileItem which is going to be automatically destroyed on session destruction
*
* @param pipelineContext PipelineContext
* @param fileItem FileItem
*/
public static void deleteFileOnSessionTermination(
PipelineContext pipelineContext, final FileItem fileItem) {
// Try to delete the file on exit and on session termination
final ExternalContext externalContext =
(ExternalContext) pipelineContext.getAttribute(PipelineContext.EXTERNAL_CONTEXT);
final ExternalContext.Session session = externalContext.getSession(false);
if (session != null) {
session.addListener(
new ExternalContext.Session.SessionListener() {
public void sessionDestroyed() {
deleteFileItem(fileItem, SESSION_SCOPE);
}
});
} else {
logger.debug(
"No existing session found so cannot register temporary file deletion upon session destruction: "
+ fileItem.getName());
}
}
