Condition

The example shows how to go only part of out transitions.

For this, out transitions should have names and a condition behavior returns one of them.

Setup


mkdir ~/pvm-condition
cd ~/pvm-condition
composer req formapro/pvm:0.4.x-dev makasim/values:0.5.x-dev

# create such file with the code below
php condition.php

Result

condition.php

Total price (free if >= 50): 35
ups_shipping

condition.php


<?php
use Formapro\Pvm\DefaultBehaviorRegistry;
use Formapro\Pvm\ProcessBuilder;
use Formapro\Pvm\ProcessEngine;
use Formapro\Pvm\Token;

require_once __DIR__.'/vendor/autoload.php';

$process = (new ProcessBuilder())
    ->createNode('shipping_decision', 'shipping_decision')->end()
    ->createNode('free_shipping', 'print_label')->end()
    ->createNode('ups_shipping', 'print_label')->end()

    ->createTransition('shipping_decision', 'free_shipping', 'free')->end()
    ->createTransition('shipping_decision', 'ups_shipping', 'ups')->end()
    ->createStartTransition('shipping_decision')->end()

    ->getProcess()
;

$engine = new ProcessEngine(new DefaultBehaviorRegistry([
    'print_label' => function(Token $token) {
        echo $token->getTo()->getId().PHP_EOL;
    },
    'shipping_decision' => function(Token $token) {
        echo 'Total price (free if >= 50): '. $token->getValue('total_price').PHP_EOL;

        return $token->getValue('total_price') > 50 ? 'free' : 'ups';
    }
]));

$token = $engine->createTokenFor($process->getStartTransition());
$token->setValue('total_price', rand(10, 100));

$engine->proceed($token);


{
    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Process.json",
    "id": "8eb9e53b-06d7-443d-bfa6-badc6b51afbd",
    "nodes": {
        "shipping_decision": {
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Node.json",
            "id": "shipping_decision",
            "behavior": "shipping_decision"
        },
        "free_shipping": {
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Node.json",
            "id": "free_shipping",
            "behavior": "print_label"
        },
        "ups_shipping": {
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Node.json",
            "id": "ups_shipping",
            "behavior": "print_label"
        }
    },
    "transitions": {
        "9b96669d-6ca5-44ee-b0b2-f70ffb3ff378": {
            "id": "9b96669d-6ca5-44ee-b0b2-f70ffb3ff378",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "name": "free",
            "from": "shipping_decision",
            "to": "free_shipping"
        },
        "63cbb871-de12-4ae9-b1b0-3c49b78856d7": {
            "id": "63cbb871-de12-4ae9-b1b0-3c49b78856d7",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "name": "ups",
            "from": "shipping_decision",
            "to": "ups_shipping"
        },
        "03e95bbd-6422-466d-8916-b404856862e1": {
            "id": "03e95bbd-6422-466d-8916-b404856862e1",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "to": "shipping_decision"
        }
    },
    "outTransitions": {
        "shipping_decision": [
            "9b96669d-6ca5-44ee-b0b2-f70ffb3ff378",
            "63cbb871-de12-4ae9-b1b0-3c49b78856d7"
        ]
    },
    "inTransitions": {
        "free_shipping": [
            "9b96669d-6ca5-44ee-b0b2-f70ffb3ff378"
        ],
        "ups_shipping": [
            "63cbb871-de12-4ae9-b1b0-3c49b78856d7"
        ],
        "shipping_decision": [
            "03e95bbd-6422-466d-8916-b404856862e1"
        ]
    },
    "tokens": {
        "ad528a5b-95c9-4aa8-badd-ddad44b1692b": {
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Token.json",
            "id": "ad528a5b-95c9-4aa8-badd-ddad44b1692b",
            "transitions": [
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "97edecc7-3779-4b99-9054-21636edf4447",
                    "transitionId": "03e95bbd-6422-466d-8916-b404856862e1",
                    "weight": 1,
                    "state": "opened",
                    "time": 15664832586791
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "07a8a451-9fad-4b3d-b337-ac14141d15c9",
                    "transitionId": "03e95bbd-6422-466d-8916-b404856862e1",
                    "weight": 1,
                    "state": "passed",
                    "time": 15664832586796
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "18c93c0a-e1c9-4df5-a9eb-0c491f61c5f7",
                    "transitionId": "63cbb871-de12-4ae9-b1b0-3c49b78856d7",
                    "weight": 1,
                    "state": "opened",
                    "time": 15664832586799
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "4e88f2cc-664f-4f5c-9294-0edc5fa138a0",
                    "transitionId": "63cbb871-de12-4ae9-b1b0-3c49b78856d7",
                    "weight": 1,
                    "state": "passed",
                    "time": 15664832586803
                }
            ],
            "total_price": 35
        }
    }
}