bbc/process-helper

Name: process-helper

Owner: BBC

Description: Utility for managing sub processes.

Created: 2015-06-12 09:56:31.0

Updated: 2017-01-12 08:54:34.0

Pushed: 2016-11-23 09:27:21.0

Homepage:

Size: 12

Language: Ruby

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README

Process Helper

Provides a wrapper around external processes

It collects standard-out and standard-error, allowing:

• the output to be searched for particular output
• the parent process wait for particular output to appear

License

This is licensed under the Apache 2.0 License

Example usage

utable_args = ['echo', 'hello $USER, ruby passed me "$V"']
_for = /(hello .*)/
ess = ProcessHelper::ProcessHelper.new()
ess.start(executable_args, wait_for, 30, {'V' => 'v'})

This will start the process echo and wait for it to have printed a line matching the regex to STDOUT.

For a longer running process that you want to interact with:

ess = ProcessHelper::ProcessHelper.new()
ess.start(['java', '-jar', 'some.jar'], /(Server Started)/)

teractions with the java process...

ess.kill
ess.wait_for_exit

Caveats

There should be one ProcessHelper instance per external process. For example, the following will only kill the second process.

ess = ProcessHelper::ProcessHelper.new()
ess.start(['long_running_process', 'one'])
ess.start(['long_running_process', 'two'])
ess.kill