public Category getCategory() 
{
    return Category.QUERYHANDLER;
}

 abstract public String getDescription()

 public URL[] getDocs() 
{
    return null;  // this can be overridden, but not required
}

 public String getName() 
{
    return this.getClass().getName();
}

 abstract public String getSource()

 abstract public String getSourceId()

 public NamedList getStatistics() 
{
    NamedList lst = new SimpleOrderedMap();
    lst.add("requests", numRequests);
    lst.add("errors", numErrors);
    return lst;
}

 abstract public String getVersion()

 public  void handleRequest(SolrQueryRequest req,
    SolrQueryResponse rsp) 
{
    numRequests++;
    try {
      U.setDefaults(req,defaults,appends,invariants);
      handleRequestBody( req, rsp );
    } catch (Exception e) {
      SolrException.log(SolrCore.log,e);
      rsp.setException(e);
      numErrors++;
    }
}

 abstract public  void handleRequestBody(SolrQueryRequest req,
    SolrQueryResponse rsp) throws Exception

 public  void init(NamedList args) 
{
    // Copied from StandardRequestHandler 
    if( args != null ) {
      Object o = args.get("defaults");
      if (o != null && o instanceof NamedList) {
        defaults = SolrParams.toSolrParams((NamedList)o);
      }
      o = args.get("appends");
      if (o != null && o instanceof NamedList) {
        appends = SolrParams.toSolrParams((NamedList)o);
      }
      o = args.get("invariants");
      if (o != null && o instanceof NamedList) {
        invariants = SolrParams.toSolrParams((NamedList)o);
      }
    }
}