Process::Launcher - Execute Process objects from the command line
# Create from passed params and run perl -MProcess::Launcher -e run MyProcessClass param value # Create from STDIN params and run perl -MProcess::Launcher -e run3 MyProcessClass # Thaw via Storable from STDIN, and freeze back after to STDOUT perl -MProcess::Launcher -e storable MyProcessClass # Requires Process::YAML to be installed: # Thaw via YAML::Syck from STDIN, and freeze back after to STDOUT perl -MProcess::Launcher -e yaml MyProcessClass
Process::Launcher module provides a mechanism for launching and running a Process-compatible object from the command line, and returning the results.
Most use cases involve isolation. By having a
Process object run inside its own interpreter, it is then free do things such as loading in vast amounts of data and modules without bloating out the main process.
It could provide a novel way of giving Out Of Memory (OOM) protection to your Perl process, because when the operating system's OOM-killer takes out the large (or runaway) process, the main program is left intact.
It provides a way to run some piece of code in a different Perl environment than your own. This could mean a different Perl version, or running something with tainting on without needing the main process to have tainting.
All functions are imported into the callers by default.
run function creates an object based on the arguments passed to the program on the command line.
The first param is take as the Process class and loaded, and the rest of the params are passed directly to the constructor.
Note that this does mean you can't pass anything more complex than simple string pairs. If you need something more complex, try the
storable function below.
Prints one line of output at the end of the process run.
# Prints the following if the process completed correctly OK # Prints the following if the process does not complete FAIL - reason
run3 function is similar to the
run function but assumes you are launching the process via something that makes it easy to pass in params via
STDIN, such as IPC::Run3 (recommended)
It takes a single param of the Process class.
It then readsa series of key-value pairs from
STDIN in the form
At the end of the input, the key/value pairs are passed to the constructor, and from there the function behaves identically to
run above, including output.
serialized function is more robust and thorough again.
This object has
prepare and then
run called on it.
FAIL line will be written as above, but after that first line, the completed object will be frozen back out via
serialize and written to
STDOUT as well.
The intent is that you create your object of the
Process::Serializable subcless in your main interpreter thread, then hand it off to another Perl instance for execution, and then optionally return it to handle the results.
Bugs should be reported via the CPAN bug tracker at
For other issues, contact the author.
Adam Kennedy <email@example.com>
Copyright 2006 - 2011 Adam Kennedy.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
The full text of the license can be found in the LICENSE file included with this module.