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Loading the Configuration Data

The script now invokes the load_configuration method to load the configuration onto the routing platform. It places the statement inside an eval block to ensure that the graceful_shutdown subroutine is invoked if the response from the JUNOScript server has errors.

     eval {
     $res = $jnx->load_configuration(
         format => $config_format,
         action => $load_action,
         configuration => $doc);
     };
     if ($@) {
         print "ERROR: Failed to load the configuration from $xmlfile.   Reason: $@\n";
         graceful_shutdown($jnx, $xmlfile, STATE_CONFIG_LOADED, REPORT_FAILURE);
         exit(1);
     }

The variables used to define the method’s three arguments were set at previous points in the application file:

The $config_format variable was previously set to xml unless the -t command-line option is included:
```
     my $config_format = "xml";
     $config_format = "text" if $opt{t};
```

The $load_action variable was previously set to merge unless the -a command-line option is included. The final two lines verify that the specified value is one of the acceptable choices:

     my $load_action = "merge";
     $load_action = $opt{a} if $opt{a};
     use constant VALID_ACTIONS => "merge|replace|override";
     output_usage(????) unless ( $load_action =~ /VALID_ACTIONS/);

The $doc variable was set to the output from the parsestring or parsefile function (defined in the XML::DOM::Parser module), as described in Reading In and Parsing the Configuration Data.

The script performs two additional checks for errors and invokes the graceful_shutdown subroutine in either case:

     unless ( ref $res ) {
         print "ERROR: Failed to load the configuration from $xmlfile\n";
         graceful_shutdown($jnx, $xmlfile, STATE_LOCKED, REPORT_FAILURE);
     }
     $err = $res->getFirstError(????);
     if ($err) {
         print "ERROR: Failed to load the configuration. Reason: $err->{message}\n";
         graceful_shutdown($jnx, $xmlfile, STATE_CONFIG_LOADED, REPORT_FAILURE);
     }

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