Code to illustrate UML examples

Object Orientation: Design Patterns example from a Well House Consultants training course
More on Object Orientation: Design Patterns [link]

This example is described in the following article(s):
• Designing your application - using UML techniques - [link]

This example references the following resources:
http://www.wellho.net/forum/The-Tcl-programming-language/suspend-then-background-process-run-from-expect.html

Source code: umli.php Module: Q908

<?php

/* An example which analyses a web server log file. This is a major OO demo and will be
backed up by sample UML diagrams.

Overview ... we're going to read in a web server log file and make up "visit" objects each
of which will include a number (1 or more) access objects. We'll then call methods on the
visits to inform the person running the application

Written by ... version number ... who to call for support ... copyright ... */

// --------- These classes would normally be in a separate (series of) file(s).

class visit {

        function factory($sourcefile) { // Static utility method!
                $fh = fopen($sourcefile,"r");
                $ips = array();
                $vis = array();
                while ($lyne = fgets($fh)) {
                        $parts = explode(" ",$lyne); // Spike solution - should do better later
                        $remote = $parts[0];
                        if ($ips[$remote]) { // This is another access fom same place
                                $visit_number = $ips[$remote];
                                $vis[$visit_number]->addhit($lyne);
                        } else { // This is the first access from a place
                                array_push($vis, new visit($lyne));
                                $ips[$remote] = count($vis)-1;
                        }
                }
                fclose($fh);
                return $vis;
        }

        function __construct ($definition) { // php5 equiv to "function visit"
                $this->hits = array();
                $this->addhit($definition);
        }

        function addhit($definition) {
                $potential = new access($definition);
                if ($potential->method != "OTHER") array_push($this->hits, $potential);
                }

        function getelapsed() {
                if (count($this->hits) > 0) {
                        $first = $this->hits[0]->getsincemidnight();
                        $last = $this->hits[count($this->hits)-1]->getsincemidnight();
                        return ($last - $first); // Need to add overmidnight correction
                } else {
                        return -1;
                }
                }

        function getcount() {
                return count($this->hits);
                }

        function getid() {
                if (count($this->hits) < 1) return "Others Only";
                return $this->hits[0]->getip();
        }
}

// ---------------

/* Sample source record - to help class maintainer!
223-136-179-250.dynamic.hinet.net - - [06/Feb/2012:04:05:27 +0000]
"GET /bing/images/WHClogoBW.jpg HTTP/1.1" 200 12344
"http://www.wellho.net/forum/The-Tcl-programming-language/suspend-then-background-process-run-from-expect.html"
"Mozilla/5.0 (iPhone; CPU iPhone OS 5_0_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1
Mobile/9A405 Safari/7534.48.3" */

class access {

        function __construct($source) {
                // We're likely to split up and define quite a bit (more) here!
                if (preg_match('!(\S+)[^:]+:(\d+):(\d+):(\d+).*(GET|POST)\s+([^\?\s]+)[^"]+"\s+(\S+)!',$source,$gotten)) {
                        list($all, $this->ip, $this->hour, $this->min, $this->sec,
                                        $this->method, $this->url, $this->status) = $gotten;
                } else {
                        $this->method = "OTHER";
                }
        }

        function getip() {
                return $this->ip;
        }

        function getsincemidnight() {
                return $this->hour * 3600 + $this->min * 60 + $this->sec ;
        }
}

// --------- And here is the application / test harness

$visits = visit::factory("sample.log"); // Run a static (class rather than object) function

$response = "";
foreach ($visits as $v) {
        $elapsed = $v->getelapsed();
        $nhits = $v->getcount();
        $remote = $v->getid();
        $response .= "From $remote, $nhits accesses over $elapsed seconds<br />\n";
}

?>
<html>
<head><title>Web Server Analysis Test Harness</title></head>
<body><h1>Test Harness - visit analysis</h1>
<?= $response ?>
</body></html>

Learn about this subject

This module and example are covered on the following public courses:
* Learning to program in Python
* Object Oriented Programming in PHP
* Python Programming
* Intermediate Python
Also available on on site courses for larger groups

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Other Examples

This example comes from our "Object Orientation: Design Patterns" training module. You'll find a description of the topic and some other closely related examples on the "Object Orientation: Design Patterns" module index page.

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