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BPM Command Line Interface Tool (bpmcli)

Introduction

bpmcli is a command line based debugging tool for interfacing with the bpmd process from a shell running on the BPM front-end. An expert should be able to use bpmcli to execute any of the bpmd control message queue commands and to examine any of the bpmd shared memory region data structures.

Design

Usage

$ bpmcli command [options]

Where 'command' is always provided. If the command is missing bpmcli should display an error and a 'hint' for proper usage.

The user should be able to redirect stdin, stdout as one would expect to with any Unix command-line utility. This means any error messages should go to stderr.

cli.C

The entry point (main(..)) is in cli.C. The bpmcli executable has it's own target in Makefile. Because most of the commands interact in someway with bpmd, a SharedMemoryClient and a ControlMQClient object are instantiated as automatic variables in main(..) and passed by reference to the CLICommand. A large if/else structure parses the command argument (argv[1]) and then calls the run() method for the appropriate CLICommand child. The argc and argv parameters are passed as arguments to the run() method to process the command-line options.

CLICommand

The architecture of bpmcli is based on a simple implementation of the GoF Strategy pattern with the CLICommand class taking the place of the "Strategy". Each command that the user can provide to bpmcli is implemented as a child of CLICommand and must override the virtual _run() and helpShow() methods. CLICommand implements a public run() method that takes in argc and argv as parameters and uses the getopt API to parse command line options. A couple of command line options are parsed by CLICommand (e.g. -b and -i) but the implementations may provide their own options to getopt via the virtual _optsGet() and _optProcess methods.