Class AbsCache

src/main/java/com/mxgraph/online/AbsCache.java:28–543

import org.apache.commons.lang3.exception.ExceptionUtils;

abstract public class AbsCache extends HttpServlet implements AbsComm
{
	/**
	 * Path component under war/ to locate iconfinder_key file.
	 */
	protected static final String PUSHER_CONFIG_FILE_PATH = "pusher_properties";

	/**
	 * Path component under war/ to locate iconfinder_key file.
	 */
	protected static final boolean debugOutput = false;

	/**
	 * Path component under war/ to locate iconfinder_key file.
	 */
	protected static final int expirationDelta = 300;

	/**
	 * Path component under war/ to locate iconfinder_key file.
	 */
	protected static final int maxCacheSize = 1000000;

	/**
	 * Path component under war/ to locate iconfinder_key file.
	 */
	protected static Pusher pusher = null;

	/**
	 * Global cache is used for patches, last versions and tokens. They are
	 * separated via their key formats as follows:
	 * 
	 * Patches use ID:VERSION and map to a CacheEntry which contains the next
	 * version, patch data and secret.
	 * 
	 * Last versions use ID@VERSION and map to a String which contains the
	 * known last version of the file. This is used to verify the secret.
	 * 
	 * Tokens use ID#SECRET and map to a String which contains the token.
	 * The token is used to authorize the patch in a subsequent request.
	 */
	protected static Cache cache = null;

	static
	{
		try
		{
			cache = CacheFacade.createCache("AbsCache", expirationDelta);
		}
		catch (Exception e)
		{
			e.printStackTrace();
		}
	}

	/**
	 * Creates the key for the cache entry.
	 */
	protected static String createCacheEntryKey(String id, String version)