retrieve the singleton instance of the gwt push context . concode_field_sep IcePushClientLibrary icePushClient concode_elem_sep GWTPushContext instance concode_field_sep void removePushEventListener concode_elem_sep void addPushEventListener concode_elem_sep void addPushEventListener
GWTPushContext function ( ) { if ( instance == null ) { instance = new GWTPushContext ( ) ; } return instance ; }