protected RateLimiter recomputeFetchRateLimiter(RateLimiter oldLimiter) {
    String rate = CurrentConfig.getParam(PARAM_REGISTRY_FETCH_RATE, DEFAULT_REGISTRY_FETCH_RATE);
    Object limiterKey = getFetchRateLimiterKey();

    if (limiterKey == null) {
      return RateLimiter.getRateLimiter(oldLimiter, rate, DEFAULT_REGISTRY_FETCH_RATE);
    } else {
      RateLimiter.Pool pool = RateLimiter.getPool();
      return pool.findNamedRateLimiter(limiterKey, rate, DEFAULT_REGISTRY_FETCH_RATE);
    }
  }
 protected void initMimeMap() throws PluginException.InvalidDefinition {
   for (Iterator iter = definitionMap.entrySet().iterator(); iter.hasNext(); ) {
     Map.Entry ent = (Map.Entry) iter.next();
     String key = (String) ent.getKey();
     Object val = ent.getValue();
     if (key.endsWith(DefinableArchivalUnit.SUFFIX_LINK_EXTRACTOR_FACTORY)) {
       String mime = stripSuffix(key, DefinableArchivalUnit.SUFFIX_LINK_EXTRACTOR_FACTORY);
       if (val instanceof String) {
         String factName = (String) val;
         log.debug(mime + " link extractor: " + factName);
         MimeTypeInfo.Mutable mti = mimeMap.modifyMimeTypeInfo(mime);
         LinkExtractorFactory fact =
             (LinkExtractorFactory) newAuxClass(factName, LinkExtractorFactory.class);
         mti.setLinkExtractorFactory(fact);
       }
     } else if (key.endsWith(DefinableArchivalUnit.SUFFIX_CRAWL_FILTER_FACTORY)) {
       // XXX This clause must precede the one for SUFFIX_HASH_FILTER_FACTORY
       // XXX unless/until that key is changed to not be a terminal substring
       // XXX of this one
       String mime = stripSuffix(key, DefinableArchivalUnit.SUFFIX_CRAWL_FILTER_FACTORY);
       if (val instanceof String) {
         String factName = (String) val;
         log.debug(mime + " crawl filter: " + factName);
         MimeTypeInfo.Mutable mti = mimeMap.modifyMimeTypeInfo(mime);
         FilterFactory fact = (FilterFactory) newAuxClass(factName, FilterFactory.class);
         mti.setCrawlFilterFactory(fact);
       }
     } else if (key.endsWith(DefinableArchivalUnit.SUFFIX_HASH_FILTER_FACTORY)) {
       String mime = stripSuffix(key, DefinableArchivalUnit.SUFFIX_HASH_FILTER_FACTORY);
       if (val instanceof String) {
         String factName = (String) val;
         log.debug(mime + " filter: " + factName);
         MimeTypeInfo.Mutable mti = mimeMap.modifyMimeTypeInfo(mime);
         FilterFactory fact = (FilterFactory) newAuxClass(factName, FilterFactory.class);
         mti.setHashFilterFactory(fact);
       }
     } else if (key.endsWith(DefinableArchivalUnit.SUFFIX_FETCH_RATE_LIMIT)) {
       String mime = stripSuffix(key, DefinableArchivalUnit.SUFFIX_FETCH_RATE_LIMIT);
       if (val instanceof String) {
         String rate = (String) val;
         log.debug(mime + " fetch rate: " + rate);
         MimeTypeInfo.Mutable mti = mimeMap.modifyMimeTypeInfo(mime);
         RateLimiter limit = mti.getFetchRateLimiter();
         if (limit != null) {
           limit.setRate(rate);
         } else {
           mti.setFetchRateLimiter(new RateLimiter(rate));
         }
       }
     } else if (key.endsWith(DefinableArchivalUnit.SUFFIX_LINK_REWRITER_FACTORY)) {
       String mime = stripSuffix(key, DefinableArchivalUnit.SUFFIX_LINK_REWRITER_FACTORY);
       String factName = (String) val;
       log.debug(mime + " link rewriter: " + factName);
       MimeTypeInfo.Mutable mti = mimeMap.modifyMimeTypeInfo(mime);
       LinkRewriterFactory fact =
           (LinkRewriterFactory) newAuxClass(factName, LinkRewriterFactory.class);
       mti.setLinkRewriterFactory(fact);
     } else if (key.endsWith(DefinableArchivalUnit.SUFFIX_METADATA_EXTRACTOR_FACTORY_MAP)) {
       String mime = stripSuffix(key, DefinableArchivalUnit.SUFFIX_METADATA_EXTRACTOR_FACTORY_MAP);
       Map factNameMap = (Map) val;
       Map factClassMap = new HashMap();
       MimeTypeInfo.Mutable mti = mimeMap.modifyMimeTypeInfo(mime);
       for (Iterator it = factNameMap.keySet().iterator(); it.hasNext(); ) {
         String mdTypes = (String) it.next();
         String factName = (String) factNameMap.get(mdTypes);
         log.debug(mime + " (" + mdTypes + ") metadata extractor: " + factName);
         for (String mdType : (List<String>) StringUtil.breakAt(mdTypes, ";")) {
           setMdTypeFact(factClassMap, mdType, factName);
         }
       }
       mti.setFileMetadataExtractorFactoryMap(factClassMap);
     }
   }
 }