Examples of com.dbxml.labrador.broker.BrokerContext

com.dbxml.labrador.broker.BrokerContext
BrokerContext encapsulates many of the Labrador instances that were resolved by the Broker before invoking a request. This information is made available via a ThreadLocal variable from the Broker and can be used to find out more about the Request, including the Endpoint, Resolver, Handler, and Instance. Contexts are stacked in the case of recursive service calls to the same VM Thread. Properties will be inherited from the parent contexts and may be shadowed in the local context.


      try {
         Key key = new Key(docName);


         // Let's see if we can interact with Labrador's HTTP Server for REST calls
         BrokerContext context = Broker.getInstance().getBrokerContext();
         Handler handler = context.getHandler();
         Endpoint endpoint = context.getRequestEndpoint();


         boolean restHandler = handler instanceof RESTHandler;
         boolean httpEndpoint = endpoint instanceof HTTPServerBase;


         if ( restHandler && httpEndpoint ) {
            Request request = context.getRequest();
            Response response = context.getResponse();


            RecordMetaData meta = col.getRecordMetaData(tx, key);
            if ( meta != null ) {
               Long lm = (Long)meta.getValue(RecordMetaData.MODIFIED);
               if ( lm != null ) {
                  String lastModified = GDF.format(new Date(lm.longValue()));


                  response.setHeader(HTTP.HEADER_CACHE_CONTROL, HTTP.VALUE_CACHE);
                  response.setHeader(HTTP.HEADER_LAST_MODIFIED, lastModified);


                  String since = request.getHeader(HTTP.HEADER_IF_MODIFIED_SINCE);
                  if ( since != null && since.length() > 0 && since.equals(lastModified) )
                     throw new HTTPException(HTTP.CODE_NOT_MODIFIED, HTTP.STATUS_NOT_MODIFIED);
               }
            }
         }


         if ( type == Container.TYPE_DOCUMENT ) {
            if ( restHandler )
               context.setProperty(RESTHandler.CONTENT_TYPE, Headers.TYPE_TEXT_XML);


            String doc = DTSMHelper.tableToText(col.getDocument(tx, docName));
            return UTF8.toUTF8(doc);
         }
         else

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   public Document get() throws DBException {
      Document doc = DOMHelper.newDocument();


      // Let's see if we can interact with Labrador's HTTP Server for REST calls
      BrokerContext context = Broker.getInstance().getBrokerContext();
      Handler handler = context.getHandler();
      boolean restHandler = handler instanceof RESTHandler;


      if ( restHandler ) {
         StringBuffer sb = new StringBuffer();
         sb.append("type=\"text/xsl\" href=\"");

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               sessionID = new ID(value);
            }
         }
      }


      BrokerContext brokerContext = Broker.getInstance().getBrokerContext();
      ID instanceID = brokerContext.getId();
      SessionContext context = getClosestContext(instanceID);


      boolean setCookie = sessionID == null || context.expires;


      if ( sessionID == null )
         sessionID = new ID();


      if ( setCookie ) {
         StringBuffer sb = new StringBuffer();
         sb.append(COOKIE_NAME);
         sb.append('=');
         sb.append(sessionID);
         sb.append("; Path=");
         sb.append(context.path);


         if ( context.expires ) {
            // Expire when the Session times out
            sb.append("; Max-Age=");
            sb.append(Integer.toString(context.timeout));
         }
         else {
            // Expire in a few years (like not expiring at all)
            sb.append("; Expires=");
            sb.append(getExpiration());
         }


         response.setHeader(HTTP.HEADER_SET_COOKIE, sb.toString());
      }


      brokerContext.setProperty(PROP_SESSION_ID, sessionID);
      brokerContext.setProperty(PROP_SESSION_CONTEXT, context);


      return true;
   }

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      }
      return info;
   }


   static Session getCurrentSession() throws SessionException {
      BrokerContext brokerContext = Broker.getInstance().getBrokerContext();


      ID sessionID = (ID)brokerContext.getProperty(PROP_SESSION_ID);
      SessionContext context = (SessionContext)brokerContext.getProperty(PROP_SESSION_CONTEXT);


      if ( sessionID != null ) {
         Map sessions = context.sessions;
         Session session = (Session)sessions.get(sessionID);
         if ( session == null ) {

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         else
            throw new RequestException("No method name was set");
      }
      instance.setMethodName(methodName);


      BrokerContext context = Broker.getInstance().getBrokerContext();
      Discovery disc = context.getDiscovery();
      String[] paramNames = disc.listParams(methodName);
      boolean postUsed = false;


      for ( int i = 0; paramNames != null && i < paramNames.length; i++ ) {
         boolean array = disc.isParamArray(methodName, i);
         String[] vals = request.getValues(paramNames[i]);


         if ( vals != null ) {
            if ( array )
               instance.setParameter(i, vals);
            else
               instance.setParameter(i, vals[0]);
         }
         else if ( !postUsed && request.hasContent() ) {
            // If there is POST data, and this parameter is a String, Document,
            // or byte array, then let us assume that the POST data is intended
            // for this one.
            try {
               InputStream is = request.getInputStream();
               ByteArrayOutputStream bos = new ByteArrayOutputStream(BUFFER_SIZE);


               byte[] buffer = new byte[BUFFER_SIZE];
               int size;
               do {
                  size = is.read(buffer);
                  if ( size > 0 )
                     bos.write(buffer, 0, size);
               }
               while ( size != -1 );


               instance.setParameter(i, bos.toByteArray());
               postUsed = true;
            }
            catch ( IOException e ) {
               /** @todo Hmmm */
            }
         }
         else
            instance.setParameter(i, null);
      }


      // Initially set the MIME type in case we get an HTTP 403 Exception
      ID id = context.getId();


      String contentType = getMimeType(id);
      if ( contentType != null )
         response.setHeader(HTTP.HEADER_CONTENT_TYPE, contentType);


      Object o = instance.invoke();


      Object type = context.getProperty(CONTENT_TYPE);
      if ( type == null )
         type = instance.getProperty(CONTENT_TYPE+'_'+methodName);


      if ( type instanceof String ) {
         contentType = (String)type;

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         catch ( Exception e ) {
            // The nulls will catch it
         }


         if ( user != null && pass != null && isAuthValid(user, pass) ) {
            BrokerContext ctx = Broker.getInstance().getBrokerContext();
            ctx.setProperty(PROP_USER, user);
            ctx.setProperty(PROP_PASS, pass);
            return true;
         }
         else
            throw new AuthException(HTTP.VALUE_BASIC, getAuthRealm(request));
      }

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   }


   public byte[] get() throws Exception {
      try {
         // Let's see if we can interact with Labrador's HTTP Server for REST calls
         BrokerContext context = Broker.getInstance().getBrokerContext();
         Handler handler = context.getHandler();
         Endpoint endpoint = context.getRequestEndpoint();


         URL url = new URL(uri);
         URLConnection conn = url.openConnection();
         conn.setUseCaches(true);
         conn.setDoInput(true);
         conn.setDoOutput(false);


         String modSince = null;
         String lastMod = null;


         boolean browserClient = handler instanceof RESTHandler && endpoint instanceof HTTPServerBase;


         // Yank some request headers from the client and pass them through
         if ( browserClient ) {
            Request request = context.getRequest();


            for ( int i = 0; i < PASSTHRU_REQUEST_HEADERS.length; i++ ) {
               String key = PASSTHRU_REQUEST_HEADERS[i];
               String value = request.getHeader(key);
               if ( value != null && value.length() > 0 ) {
                  if ( key == HTTP.HEADER_IF_MODIFIED_SINCE )
                     modSince = value;
                  else
                     conn.setRequestProperty(key, value);
               }
            }
         }


         // Set or override Headers
         Iterator iter = headers.keySet().iterator();
         while ( iter.hasNext() ) {
            String key = (String)iter.next();
            String value = (String)headers.get(key);
            conn.setRequestProperty(key, value);
         }


         // Connect to the server and make the request
         conn.connect();


         // Yank some reponse headers from the server and pass them through
         if ( browserClient ) {
            Response response = context.getResponse();


            for ( int i = 0; i < PASSTHRU_RESPONSE_HEADERS.length; i++ ) {
               String key = PASSTHRU_RESPONSE_HEADERS[i];
               String value = conn.getHeaderField(key);
               if ( value != null && value.length() > 0 ) {

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Related Classes of com.dbxml.labrador.broker.BrokerContext

com.dbxml.db.server.labrador.CollectionProxy

com.dbxml.db.server.labrador.ContentProxy

com.dbxml.labrador.filters.BasicAuthFilter

com.dbxml.labrador.http.HTTPProxyInstance

com.dbxml.labrador.rest.RESTHandler

com.dbxml.labrador.sessions.SessionFilter

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