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): 26
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": "d372199c-ae2f-4dbf-ab77-281bb44a506b",
    "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": {
        "4e91be1a-5be7-428b-9b83-145ce9955c57": {
            "id": "4e91be1a-5be7-428b-9b83-145ce9955c57",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "name": "free",
            "from": "shipping_decision",
            "to": "free_shipping"
        },
        "1e4c991b-4036-4a2b-bb12-ee7132b9cb5c": {
            "id": "1e4c991b-4036-4a2b-bb12-ee7132b9cb5c",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "name": "ups",
            "from": "shipping_decision",
            "to": "ups_shipping"
        },
        "84647dc7-5222-44cc-b2fa-41e83a6bb7a4": {
            "id": "84647dc7-5222-44cc-b2fa-41e83a6bb7a4",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "to": "shipping_decision"
        }
    },
    "outTransitions": {
        "shipping_decision": [
            "4e91be1a-5be7-428b-9b83-145ce9955c57",
            "1e4c991b-4036-4a2b-bb12-ee7132b9cb5c"
        ]
    },
    "inTransitions": {
        "free_shipping": [
            "4e91be1a-5be7-428b-9b83-145ce9955c57"
        ],
        "ups_shipping": [
            "1e4c991b-4036-4a2b-bb12-ee7132b9cb5c"
        ],
        "shipping_decision": [
            "84647dc7-5222-44cc-b2fa-41e83a6bb7a4"
        ]
    },
    "tokens": {
        "4ea8cbcf-37b6-4614-a3cd-c8ca76eedbf7": {
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Token.json",
            "id": "4ea8cbcf-37b6-4614-a3cd-c8ca76eedbf7",
            "transitions": [
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "3895f685-6deb-436d-978d-72f11ad6ef91",
                    "transitionId": "84647dc7-5222-44cc-b2fa-41e83a6bb7a4",
                    "weight": 1,
                    "state": "opened",
                    "time": 16070842575492
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "419297a5-00c5-47a5-a30f-b1b6e5896f8f",
                    "transitionId": "84647dc7-5222-44cc-b2fa-41e83a6bb7a4",
                    "weight": 1,
                    "state": "passed",
                    "time": 16070842575496
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "242a47eb-9948-48f3-abac-7e737f78086b",
                    "transitionId": "1e4c991b-4036-4a2b-bb12-ee7132b9cb5c",
                    "weight": 1,
                    "state": "opened",
                    "time": 16070842575499
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "bb81c089-91bd-49b6-b785-26a03906dded",
                    "transitionId": "1e4c991b-4036-4a2b-bb12-ee7132b9cb5c",
                    "weight": 1,
                    "state": "passed",
                    "time": 16070842575503
                }
            ],
            "total_price": 26
        }
    }
}