Nothing
# TextQueue <- R6::R6Class(
# classname = 'TextQueue',
# inherit = AbstractQueue,
# private = list(
# txtq = NULL,
# txtq_private = NULL
# ),
# public = list(
# # Get head so that we know where we are in the queue
# `@get_head` = function(){
# # Have to do this, they didn't expose head
# private$txtq_private$txtq_get_head()
# },
# `@set_head` = function(v){
# private$txtq_private$txtq_set_head(v)
# },
#
# # Get total number of items in the queue
# `@get_total` = function(){
# private$txtq_private$txtq_get_total()
# },
# `@set_total` = function(v){
# private$txtq_private$txtq_set_total(v)
# },
#
# `@inc_total` = function(n=1){
# private$txtq_private$txtq_inc_total(n=n)
# },
#
# `@append_header` = function(msg, ...){
# private$txtq$push(title = 'header', message = msg)
# return(0)
# },
#
# `@store_value` = function(value, key){
# s <- ''
# con <- textConnection('s', 'w', local = TRUE)
# serialize(value, connection = con)
# close(con)
# s <- paste(s, collapse = '\n')
# s
# },
# restore_value = function(hash, key, preserve = FALSE){
# con <- textConnection(hash, 'r', local = TRUE)
# re <- tryCatch({
# unserialize(connection = con)
# }, error = function(e){
# NULL
# })
# re
# },
#
# `@log` = function(n = -1, all = FALSE){
# if( all ){ head <- 0 }else{ head <- self$head }
# total <- self$total
# count <- total - head
# if( n <= 0 ){ n <- count }else{ n <- min(n, count) }
# if( n == 0 ){ return() }
# if( all ){
# tbl <- private$txtq$log()
# }else{
# tbl <- private$txtq$list(n = n)
# }
# stringr::str_split_fixed(tbl$message, '\\|', 4)
# },
#
# `@reset` = function() {
# private$txtq$reset()
# },
#
# `@clean` = function(preserve = FALSE, ...) {
# private$txtq$clean()
# },
# `@validate` = function() {
# private$txtq$validate()
# },
#
# `@connect` = function(path){
#
# },
#
# initialize = function(path = tempfile()){
# if(requireNamespace('txtq'))
# private$txtq <- txtq::txtq(path)
# private$txtq_private <- private$txtq$.__enclos_env__$private
# },
#
# destroy = function(){
# private$txtq$destroy()
# delayedAssign('.lockfile', {cat2('Queue destroyed', level = 'FATAL')},
# assign.env = private)
# delayedAssign('txtq', {cat2('Queue destroyed', level = 'FATAL')},
# assign.env = private)
# delayedAssign('txtq_private', {cat2('Queue destroyed', level = 'FATAL')},
# assign.env = private)
# invisible()
# }
# )
# )
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