code: protected static I_CmsPreviewServiceAsync getService() {
  
          if (m_previewService == null) {
              m_previewService = GWT.create(I_CmsPreviewService.class);
              String serviceUrl = CmsCoreProvider.get().link("org.opencms.ade.galleries.CmsPreviewService.gwt");
              ((ServiceDefTarget)m_previewService).setServiceEntryPoint(serviceUrl);
          }
          return m_previewService;
      }
docs: Returns the preview service.<p>
  
  @return the preview service