Julia bindings for the XRootD high performance, scalable, and fault tolerant access to data repositories. It facilitates the interface with the XRootD client, by writing Julia code instead of having to write C++. This package is developed using the CxxWrap.jl package to wrap C++ types and functions to Julia. Wrapper C++ code is generated with the help of WrapIt tool that uses of the clang library.
The Julia interface has been inspired by the functionality provided by pyxrootd, which implements a set of simple but pythonic bindings for XRootD. In the case of Julia, we have used the same function names if there was an equivalent in the Base module.
The XRootD.jl package does no require any special installation. Stable releases are registered into the Julia general registry, and therefore can be deployed with the standard Pkg Julia package manager.
julia> using Pkg
julia> Pkg.add("XRootD")The client module XRootD.XrdCl provides the two main types to interact with the XRootD server: the FileSystem to do operations on the file system and File to read and write files. Here is an example session.
using XRootD.XrdCl
#---FileSystem interface---------------------------------------
fs = FileSystem("root://localhost:1094") # create a FileSystem
st, _ = ping(fs) # is server alive?
isError(st) && error(st)
st, statinfo = stat(fs, "/tmp") # get statinfo
if isOK(st) && isdir(statinfo)
st, entries = readdir(fs, "/tmp") # ls the directory
isError(st) && error(st)
for f in entries
println(f)
end
end
#---File interface--------------------------------------------
f = File()
# create file and write
st, _ = open(f, "root://localhost:1094//tmp/testfile.txt", OpenFlags.New|OpenFlags.Write)
isError(st) && error(st)
write(f, "Hello\nWorld\nFolks!")
close(f)
# re-open file and read
st, _ = open(f, "root://localhost:1094//tmp/testfile.txt", OpenFlags.Read)
isError(st) && error(st)
st, lines = readlines(f)
isError(st) && error(st)
for line in lines
print(line)
end
close(f)
# delete file (using FileSystem)
st, _ = rm(fs, "/tmp/testfile.txt")