nsIUrlClassifierDBService Interface

 Begin a stream update.  This should be called once per url being
 fetched.

 @param table The table the contents of this stream will be associated
              with, or empty for the initial stream.
 @param serverMAC The MAC specified by the update server for this stream.
                  If the server has not specified a MAC (which is the case
                  for the initial stream), this will be empty.

void beginStream(in ACString table, in ACString serverMAC)

 Begin an update process.  Will throw NS_ERROR_NOT_AVAILABLE if there
 is already an update in progress.

 @param updater The update observer tied to this update.
 @param tables A comma-separated list of tables included in this update.
 @param clientKey The client key for calculating an update's MAC,
        or empty to ignore MAC.

void beginUpdate(in nsIUrlClassifierUpdateObserver updater, in ACString tables, in ACString clientKey)

 Cancel an incremental update.  This rolls back any pending changes.
 and resets the update interface.

 The update observer's updateError method will be called when the
 update has been rolled back.

void cancelUpdate()

 Finish an individual stream update.  Must be called for every
 beginStream() call, before the next beginStream() or finishUpdate().

 The update observer's streamFinished will be called once the
 stream has been processed.

void finishStream()

 Finish an incremental update.  This will attempt to commit any
 pending changes and resets the update interface.

 The update observer's updateSucceeded or updateError methods
 will be called when the update has been processed.

void finishUpdate()

 Lists the tables along with which chunks are available in each table.
 This list is in the format of the request body:
   tablename;chunkdata\n
   tablename2;chunkdata2\n

 For example:
   goog-phish-regexp;a:10,14,30-40s:56,67
   goog-white-regexp;a:1-3,5

void getTables(in nsIUrlClassifierCallback c)

 Looks up a key in the database.

 @param key: The URL to search for.  This URL will be canonicalized
        by the service.
 @param c: The callback will be called with a comma-separated list
        of tables to which the key belongs.

void lookup(in ACString spec, in nsIUrlClassifierCallback c)

 Reset the url-classifier database.  This call will delete the existing
 database, emptying all tables.  Mostly intended for use in unit tests.

void resetDatabase()

 Set the nsIUrlClassifierCompleter object for a given table.  This
 object will be used to request complete versions of partial
 hashes.

void setHashCompleter(in ACString tableName, in nsIUrlClassifierHashCompleter completer)

 Update the table incrementally.

void updateStream(in ACString updateChunk)