[R-pkg-devel] Working with connections
Hi All,
I use connections to open and close data folders needed by my package. After
each function closes I get the following warnings (depending on the connection
that has been opened).
10: closing unused connection 3
(/Library/Frameworks/R.framework/Versions/3.2/Resources/library/BondLab/BondData/bondlabMBS4.rds)
Below is the connection function that is related to the above warning:
#
#' A connection function to BondData calling MBS cusps
#'
#' Opens a connection to the BondData folder to call MBS cusip data
#' @param MBS.id A character string the MBS.id or cusip number current MBS.id
is supported
#' @export
MBS <- function(MBS.id = "character"){
MBS.Conn <- gzfile(description = paste(system.file(package =
"BondLab"),
"/BondData/", MBS.id, ".rds", sep = ""), open =
"rb")
MBS <- readRDS(MBS.Conn)
return(MBS)
close.connection(MBS.Conn)
}
I have googled this warning and it seems to be triggered when a function
terminates and the connection is open. But, I think the connection function
closes the connection once the object is returned. What am I doing wrong?
-Glenn
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Re: [R-pkg-devel] Working with connections
On Sun, Aug 9, 2015 at 8:59 AM, Glenn Schultz wrote:
> Hi All,
>
> I use connections to open and close data folders needed by my package.
> After each function closes I get the following warnings (depending on the
> connection that has been opened).
>
> 10: closing unused connection 3
> (/Library/Frameworks/R.framework/Versions/3.2/Resources/library/BondLab/BondData/bondlabMBS4.rds)
>
> Below is the connection function that is related to the above warning:
>
> #
> #' A connection function to BondData calling MBS cusps
> #'
> #' Opens a connection to the BondData folder to call MBS cusip data
> #' @param MBS.id A character string the MBS.id or cusip number current
> MBS.id is supported
> #' @export
> MBS <- function(MBS.id = "character"){
> MBS.Conn <- gzfile(description = paste(system.file(package
> = "BondLab"),
> "/BondData/", MBS.id, ".rds", sep = ""), open
> = "rb")
> MBS <- readRDS(MBS.Conn)
> return(MBS)
> close.connection(MBS.Conn)
> }
>
> I have googled this warning and it seems to be triggered when a function
> terminates and the connection is open. But, I think the connection function
> closes the connection once the object is returned. What am I doing wrong?
>
Your call to return() exits the function, so the close.connection()
call is never evaluated. Considering using on.exit() to close the
connection, since it will close the connection regardless of how the
function exits (e.g. because of an error).
> -Glenn
> __
> R-package-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel
--
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FOSS Trading | www.fosstrading.com
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Re: [R-pkg-devel] Working with connections
Hi Joshua, Thank-you.
I did not realize that the call to return closed the connection
-Glenn
> On Aug 9, 2015, at 9:04 AM, Joshua Ulrich wrote:
>
> On Sun, Aug 9, 2015 at 8:59 AM, Glenn Schultz wrote:
>> Hi All,
>>
>> I use connections to open and close data folders needed by my package.
>> After each function closes I get the following warnings (depending on the
>> connection that has been opened).
>>
>> 10: closing unused connection 3
>> (/Library/Frameworks/R.framework/Versions/3.2/Resources/library/BondLab/BondData/bondlabMBS4.rds)
>>
>> Below is the connection function that is related to the above warning:
>>
>> #
>> #' A connection function to BondData calling MBS cusps
>> #'
>> #' Opens a connection to the BondData folder to call MBS cusip data
>> #' @param MBS.id A character string the MBS.id or cusip number current
>> MBS.id is supported
>> #' @export
>> MBS <- function(MBS.id = "character"){
>> MBS.Conn <- gzfile(description = paste(system.file(package
>> = "BondLab"),
>> "/BondData/", MBS.id, ".rds", sep = ""), open
>> = "rb")
>> MBS <- readRDS(MBS.Conn)
>> return(MBS)
>> close.connection(MBS.Conn)
>> }
>>
>> I have googled this warning and it seems to be triggered when a function
>> terminates and the connection is open. But, I think the connection function
>> closes the connection once the object is returned. What am I doing wrong?
>>
> Your call to return() exits the function, so the close.connection()
> call is never evaluated. Considering using on.exit() to close the
> connection, since it will close the connection regardless of how the
> function exits (e.g. because of an error).
>
>> -Glenn
>> __
>> R-package-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>
>
>
> --
> Joshua Ulrich | about.me/joshuaulrich
> FOSS Trading | www.fosstrading.com
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R-package-devel@r-project.org mailing list
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Re: [R-pkg-devel] Working with connections
Also it's a little strange to put an RDS file _inside_ a gz, since
normally the compression is done internally.
And are you sure you should be exposing this data via a function,
rather than using the regular package data mechanism?
Hadley
On Sun, Aug 9, 2015 at 7:04 AM, Joshua Ulrich wrote:
> On Sun, Aug 9, 2015 at 8:59 AM, Glenn Schultz wrote:
>> Hi All,
>>
>> I use connections to open and close data folders needed by my package.
>> After each function closes I get the following warnings (depending on the
>> connection that has been opened).
>>
>> 10: closing unused connection 3
>> (/Library/Frameworks/R.framework/Versions/3.2/Resources/library/BondLab/BondData/bondlabMBS4.rds)
>>
>> Below is the connection function that is related to the above warning:
>>
>> #
>> #' A connection function to BondData calling MBS cusps
>> #'
>> #' Opens a connection to the BondData folder to call MBS cusip data
>> #' @param MBS.id A character string the MBS.id or cusip number current
>> MBS.id is supported
>> #' @export
>> MBS <- function(MBS.id = "character"){
>> MBS.Conn <- gzfile(description = paste(system.file(package
>> = "BondLab"),
>> "/BondData/", MBS.id, ".rds", sep = ""), open
>> = "rb")
>> MBS <- readRDS(MBS.Conn)
>> return(MBS)
>> close.connection(MBS.Conn)
>> }
>>
>> I have googled this warning and it seems to be triggered when a function
>> terminates and the connection is open. But, I think the connection function
>> closes the connection once the object is returned. What am I doing wrong?
>>
> Your call to return() exits the function, so the close.connection()
> call is never evaluated. Considering using on.exit() to close the
> connection, since it will close the connection regardless of how the
> function exits (e.g. because of an error).
>
>> -Glenn
>> __
>> R-package-devel@r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-package-devel
>
>
>
> --
> Joshua Ulrich | about.me/joshuaulrich
> FOSS Trading | www.fosstrading.com
>
> __
> R-package-devel@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-package-devel
--
http://had.co.nz/
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Re: [R-pkg-devel] Working with connections
Hi Hadley,
Thanks for answering. I basically followed what was outlined in Software for
Data Analysis. Although, I must admit it was a little light in this area
(about a paragraph). I will have to do some additional reading/research on the
RDS inside a gz issue. If it is not the correct application then I need to
correct what I am doing.
To the second issue, I am exposing then data via a function to provide data
storage/retrieval flexibility because cusip data for MBS securities can go to
the terabyte. Additionally, in the case of a REMIC (a resecuritization) the
cusip detail is assembled from many objects (a one to many relationship) before
analysis begins.
So, based on the above I was thinking that one could have the data stored
remotely (SQL, etc.) and edit the connection function as needed to point it to
the required cusip data. Is there a better way to do this?
-Glenn
On Aug 09, 2015, at 09:23 AM, Hadley Wickham wrote:
Also it's a little strange to put an RDS file _inside_ a gz, since
normally the compression is done internally.
And are you sure you should be exposing this data via a function,
rather than using the regular package data mechanism?
Hadley
On Sun, Aug 9, 2015 at 7:04 AM, Joshua Ulrich wrote:
On Sun, Aug 9, 2015 at 8:59 AM, Glenn Schultz wrote:
Hi All,
I use connections to open and close data folders needed by my package.
After each function closes I get the following warnings (depending on the
connection that has been opened).
10: closing unused connection 3
(/Library/Frameworks/R.framework/Versions/3.2/Resources/library/BondLab/BondData/bondlabMBS4.rds)
Below is the connection function that is related to the above warning:
#
#' A connection function to BondData calling MBS cusps
#'
#' Opens a connection to the BondData folder to call MBS cusip data
#' @param MBS.id A character string the MBS.id or cusip number current
MBS.id is supported
#' @export
MBS <- function(MBS.id = "character"){
MBS.Conn <- gzfile(description = paste(system.file(package
= "BondLab"),
"/BondData/", MBS.id, ".rds", sep = ""), open
= "rb")
MBS <- readRDS(MBS.Conn)
return(MBS)
close.connection(MBS.Conn)
}
I have googled this warning and it seems to be triggered when a function
terminates and the connection is open. But, I think the connection function
closes the connection once the object is returned. What am I doing wrong?
Your call to return() exits the function, so the close.connection()
call is never evaluated. Considering using on.exit() to close the
connection, since it will close the connection regardless of how the
function exits (e.g. because of an error).
-Glenn
__
R-package-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-package-devel
--
Joshua Ulrich | about.me/joshuaulrich
FOSS Trading | http://www.fosstrading.com
__
R-package-devel@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-package-devel
--
http://had.co.nz/
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