RShiny應用程序的某些部分是否可能以延遲方式執行,就像Windows服務中的延遲啓動一樣?在R Shiny應用程序中延遲執行
讓我詳細說明。
我有一個閃亮的應用程序與選項卡。每個選項卡在sidebarPanel上都有一堆單選按鈕。點擊每個單選按鈕可以顯示報告。我的設置就像這樣簡單。
但是,當我每次加載應用程序並自動呈現第一個選項卡時,將執行與此選項卡下所有單選按鈕關聯的所有報告,然後選擇第一個單選按鈕並顯示其相關報告。整個過程需要大約10到11秒鐘,我想要打倒。
在服務器啓動過程中,我只是在global.R中讀取myData.RData文件。所以所有的數據都是在服務器啓動的時候預取的(我假設保存在內存中)。該選項卡引起注意時會發生什麼情況是,讀取myData.RData中的data.frames並調用一系列ggplots(renderPlot)和表(renderText)。
有沒有一種方法可以在幾秒鐘內呈現第一份報告,然後繼續執行其他ggplots和表格?我確實通過反應性導體和隔離,但無法確定哪些解決方案適合我的問題。
或者還有其他方法可以加載(和刷新)時間嗎?
一些代碼來幫助理解這個問題..
# In server.R
library(shiny)
library(plyr)
library(ggplot2)
library(grid)
source("a.R", local=TRUE)
source("b.R", local=TRUE)
shinyServer(function(input, output) {
# The below two lines represent a report pair to me. So I have a Bar plot and the associated Table report.
output$wSummaryPlot = renderPlot({ print(drawBarPlotA("Bar Plot A")) })
output$wSummaryTable = renderText({ tableA() })
# There are about 20 such pairs in server.R
# Please note that I am including other R file by "source". The first two lines shows that. Don't know if that is what is causing the problem.
# The drawBarPlotA and tableA are functions defined in one of the source files which are included above.
# There are 5 such files which are included similarly.
})
# In ui.R
shinyUI(pageWithSidebar(
headerPanel(windowTitle = "Perfios - DAS", addHeader()),
sidebarPanel(
conditionalPanel(condition = "input.reportTabs == 1 && input.reportType == 'reportTypeA'",
wellPanel(radioButtons("showRadio", strong("Attributes:"),
c("Analysis A" = "a",
"Analysis B" = "b",
"Analysis C" = "c",
"Analysis D" = "d",
"Analysis E" = "e",
"Analysis F" = "f"
)))
))
mainPanel(
tabPanel("A", value = "1",
conditionalPanel(condition = "input.reportType == 'reportTypeA'",
conditionalPanel(condition = "showRadio == 'X'",
plotOutput("wSummaryPlot"), h4("Summary:"), verbatimTextOutput("wSummaryTable"))
# Many such element here to accomodate for those 20 reports...
)))
))
# In drawBarPlotA
drawBarPlotA = function(mainText) {
ggplot(data, aes(variable, value, fill = some_fill)) +
geom_bar(stat = "identity", position = "dodge", color = "grey") +
ylab("Y Label") +
xlab(NULL) +
theme_bw() +
ggtitle(mainText) +
scale_fill_brewer(palette = "Set1") +
annotate("text", x = 1.2, y = 0, label = "Copyright...", size = 4) +
theme(axis.text.x = element_text(angle = 45, hjust = 1, size = "12", face = "bold"),
axis.text.y = element_text(size = "12"),
plot.title = element_text(size = "14", vjust = 3, face = "bold"))
}
tableA = function() {
# This is a data.frame which is returned
data
}
你能告訴我們你的'server.R','ui.R'和任何其他必要的代碼? – MadScone
我已經添加了一段代碼。希望這可以幫助。謝謝。 – shingav