statelessmapimagebean.java

在ArcGIS中应用EJB的实例

           private void initMap(String mapServerHost, String mapServerName, String mapDescription, String imageDescription) throws Exception{
        try{

               initializeMapBean();

	       if(this.m_arcServerHostName.length() > 0 && this.m_mapServerName.length() > 0){
	      	    connectServer(m_arcServerHostName, m_mapServerName, mapDescription, imageDescription);
	       }
	       else{
	            connectServer(mapServerHost, mapServerName, mapDescription, imageDescription);
	       }

           	com.esri.arcgis.carto.IMapServerObjects mapServerObjects = new com.esri.arcgis.carto.IMapServerObjectsProxy(m_mapServer);

           	if(m_mapDescription.getCustomGraphics() != null){
            		m_graphicElements = m_mapDescription.getCustomGraphics();
           	}
           	else{
             		m_graphicElements = new com.esri.arcgis.carto.IGraphicElementsProxy(m_serverContext.createObject("esricarto.GraphicElements"));
           	}


           	m_mapServerInfo = new com.esri.arcgis.carto.IMapServerInfoProxy(m_mapServer.getServerInfo(m_mapServer.getDefaultMapName()));

           	m_imageType = new com.esri.arcgis.carto.IImageTypeProxy(m_imageDescription.getType());
           	m_imageDisplay = new com.esri.arcgis.carto.IImageDisplayProxy(m_imageDescription.getDisplay());

        	m_mapDescriptionString = m_serverContext.saveObject(m_mapDescription);

           	m_imageDescriptionString = m_serverContext.saveObject(m_imageDescription);


                releaseResources();

        }
        catch(Exception msce){
            throw new Exception("Error in initMap: " + msce.getMessage());
        }
     }

    public java.util.Hashtable zoomMap(String mapServerHost, String mapServerName, String mapDescription, String imageDescription, int pixelX, int pixelY, double factor) throws Exception{
        try{
            this.initMap(mapServerHost, mapServerName, mapDescription, imageDescription);

            com.esri.arcgis.system.ILongArray longArrayX = new com.esri.arcgis.system.ILongArrayProxy(m_serverContext.createObject("esrisystem.LongArray"));

               longArrayX.add(pixelX);

            com.esri.arcgis.system.ILongArray longArrayY = new com.esri.arcgis.system.ILongArrayProxy(m_serverContext.createObject("esrisystem.LongArray"));

               longArrayY.add(pixelY);

            com.esri.arcgis.geometry.IPointCollection points =
                                        m_mapServer.toMapPoints(m_mapDescription, m_imageDisplay, longArrayX, longArrayY);

            IPoint point = points.getPoint(0);

            IEnvelope env = m_mapDescription.getMapArea().getExtent();
            env.centerAt(point);
            env.expand(factor,factor,true);

            com.esri.arcgis.carto.IMapExtent mapExtent = new
                  com.esri.arcgis.carto.IMapExtentProxy(m_serverContext.createObject("esricarto.MapExtent"));

              mapExtent.setExtent(env);

            com.esri.arcgis.carto.IMapArea mapArea = new com.esri.arcgis.carto.IMapAreaProxy(mapExtent);
            m_mapDescription.setMapArea(mapArea);

            java.util.Hashtable hTable = new java.util.Hashtable(3);
                            m_mapImage = m_mapServer.exportMapImage(m_mapDescription, m_imageDescription);
                            hTable.put("MAPURL", m_mapImage.getURL());

            m_mapDescriptionString = m_serverContext.saveObject(m_mapDescription);
            m_imageDescriptionString = m_serverContext.saveObject(m_imageDescription);

            hTable.put("MAPDESCRIPTION", m_mapDescriptionString);
            hTable.put("IMAGEDESCRIPTION", m_imageDescriptionString);

            com.esri.arcgis.geometry.IEnvelope currentExtent = m_mapDescription.getMapArea().getExtent();

            com.esri.arcgis.samples.ejb.value.Envelope envelope = new com.esri.arcgis.samples.ejb.value.Envelope();
                envelope.setMinX(currentExtent.getXMin());
                envelope.setMaxX(currentExtent.getXMax());
                envelope.setMinY(currentExtent.getYMin());
                envelope.setMaxY(currentExtent.getYMax());

                hTable.put("EXTENT", envelope);
            return hTable;
        }
        catch(Exception exception){
            throw new Exception("Error in zoomMap: " + exception.getMessage());
        }
    }

    private void releaseResources(){
      try {
        m_serverContext.removeAll();
        m_serverContext.releaseContext();

      }
      catch (Exception ex) {
        System.out.println("Error releaseing Context: "+ex.getMessage());
      }
    }

    private void initializeMapBean(){

      javax.naming.Context initialContext, paramEnv;

          try{
              initialContext = new javax.naming.InitialContext();

              paramEnv = (javax.naming.Context)initialContext.lookup("java:comp/env");
              this.m_arcServerHostName = (String)paramEnv.lookup("ArcServerHostName");
              this.m_arcServerHostDomain = (String)paramEnv.lookup("ArcServerDomainName");
              this.m_arcServerHostUserName = (String)paramEnv.lookup("ArcServerHostUserName");
              this.m_arcServerHostPassword = (String)paramEnv.lookup("ArcServerHostPassword");
              this.m_mapServerName = (String)paramEnv.lookup("MapServerName");

              XAResource xaResource = new XAResource();
              LocalTransaction localTransaction = new LocalTransaction();

              m_connectionRequestInfo = new com.intrinsyc.jca.JintConnectionRequestInfo(
              m_arcServerHostName, this.m_arcServerHostDomain, this.m_arcServerHostUserName, this.m_arcServerHostPassword,
              "", xaResource, localTransaction);

               m_connectionFactory = (com.intrinsyc.jca.ConnectionFactory)initialContext.lookup("intrinsycjca");

          }catch(Exception exception){
              m_connectionFactory = null;
              System.out.println("JCA Lookup Failed: " + exception);
          }

          try{
                  m_connection = (com.intrinsyc.jca.Connection)m_connectionFactory.getConnection(m_connectionRequestInfo);

              java.util.Vector params = new java.util.Vector();
              params.add(m_arcServerHostName);

              if(m_connection != null){


                  m_serverConnectionObject = m_connection.getObject("com.esri.arcgis.server.ServerConnection",
                  params, this.m_arcServerHostDomain, this.m_arcServerHostUserName, this.m_arcServerHostPassword);

                  if((m_serverConnectionObject != null) && (m_serverConnectionObject instanceof com.esri.arcgis.server.ServerConnection)){

                      com.esri.arcgis.system.ServerInitializer serverInitializer = new com.esri.arcgis.system.ServerInitializer();
                      serverInitializer.setDefault(this.m_arcServerHostDomain, this.m_arcServerHostUserName, this.m_arcServerHostPassword);
                      serverInitializer.trackObjectsInCurrentThread();

                      m_serverConnection = (com.esri.arcgis.server.ServerConnection)m_serverConnectionObject;
                  }
              }
          }
          catch(Exception exception){
             System.out.println("MapBean inialization failed: " + exception.getMessage());
          }

    }







}