protected EditProcessObject createEpo(HttpServletRequest request, boolean forceNew) {
/* this is actually a bit of a misnomer, because we will reuse an epo
if an epoKey parameter is passed */
EditProcessObject epo = null;
HashMap epoHash = getEpoHash(request);
String existingEpoKey = request.getParameter("_epoKey");
if (!forceNew && existingEpoKey != null && epoHash.get(existingEpoKey) != null) {
epo = (EditProcessObject) epoHash.get(existingEpoKey);
epo.setKey(existingEpoKey);
epo.setUseRecycledBean(true);
} else {
LinkedList epoKeylist = getEpoKeylist(request);
if (epoHash.size() == MAX_EPOS) {
try {
epoHash.remove(epoKeylist.getFirst());
epoKeylist.removeFirst();
} catch (Exception e) {
// see JIRA issue VITRO-340, "Odd exception from backend editing"
// possible rare concurrency issue here
log.error("Error removing old EPO", e);
}
}
Random rand = new Random();
String epoKey = createEpoKey();
while (epoHash.get(epoKey) != null) {
epoKey += Integer.toHexString(rand.nextInt());
}
epo = new EditProcessObject();
epoHash.put(epoKey, epo);
epoKeylist.add(epoKey);
epo.setKey(epoKey);
epo.setReferer(
(forceNew)
? request.getRequestURL().append('?').append(request.getQueryString()).toString()
: request.getHeader("Referer"));
epo.setSession(request.getSession());
}
return epo;
}
