Method checkPatch

src/main/java/com/mxgraph/online/AbsCache.java:259–290

Removes the given patch if the secret does not match.

(String id, String current, String secret)

	 * Removes the given patch if the secret does not match.
	 */
	protected void checkPatch(String id, String current, String secret)
	{
		Object lastVersion = cache.remove(createLastVersionKey(id, current));

		if (lastVersion != null)
		{
			String key = createCacheEntryKey(id, lastVersion.toString());
			CacheEntry entry = (CacheEntry) cache.get(key);

			if (entry != null)
			{
				if (entry.getSecret() == null || !entry.getSecret().equals(secret))
				{
					cache.remove(key);
					debug("patch removed id=" + id + " from=" + lastVersion
							+ " to=" + current);
					
					// Marks the chain as incomplete
					cache.put(key, new CacheEntry(null, null, null));
				}
				else
				{
					debug("patch checked id=" + id + " from=" + lastVersion
							+ " to=" + current);
				}
			}
		}
		else
		{
			debug("check patch no last version for id=" + id + " current=" + current);
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)