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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def dispatch_job_hook(self, link, key, job_config, logfile, stream=sys.stdout):
 """Send a single job to the LSF batch Parameters link : `fermipy.jobs.chain.Link` The link used to invoke the command we are running key : str A string that identifies this particular instance of the job job_config : dict A dictionrary with the arguments for the job. Used with the self._command_template job template logfile : str The logfile for this job, may be used to check for success/ failure """

        full_sub_dict = job_config.copy()

        if self._no_batch:
            full_command = "%s >& %s" % (
                link.command_template().format(**full_sub_dict), logfile)
        else:
            full_sub_dict['logfile'] = logfile
            full_command_template = build_bsub_command(
                link.command_template(), self._lsf_args)
            full_command = full_command_template.format(**full_sub_dict)

        logdir = os.path.dirname(logfile)

        print_bsub = True
        if self._dry_run:
            if print_bsub:
                stream.write("%s\n" % full_command)
            return 0

        try:
            os.makedirs(logdir)
        except OSError:
            pass
        proc = subprocess.Popen(full_command.split(),
                                stderr=stream,
                                stdout=stream)
        proc.communicate()
        return proc.returncode