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Contents
module Methadone
module ExecutionStrategy
# Base for any ExecutionStrategy implementation. Currently, this is nothing more than an interface
# specification.
class Base
# Executes the command and returns the results back. This
# should do no logging or other logic other than to execute the
# command and return the required results. If command is an
# array, use exec directly bypassing any tokenization, shell or
# otherwise; otherwise use the normal shell interpretation of
# the command string.
#
# command:: the command-line to run, as an Array or a String
#
# Returns an array of size 3:
# <tt>[0]</tt>:: The standard output of the command as a String, never nil
# <tt>[1]</tt>:: The standard error output of the command as a String, never nil
# <tt>[2]</tt>:: A Process::Status-like objects that responds to <tt>exitstatus</tt> which returns
# the exit code of the command (e.g. 0 for success).
def run_command(command)
subclass_must_implement!
end
# Returns the class that, if caught by calling #run_command, represents the underlying command
# not existing. For example, in MRI Ruby, if you try to execute a non-existent command,
# you get a Errno::ENOENT.
def exception_meaning_command_not_found
subclass_must_implement!
end
protected
def subclass_must_implement!; raise "subclass must implement"; end
end
end
end
Version data entries
12 entries across 12 versions & 2 rubygems