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): 17
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": "9a514ec4-8c2d-41d9-a260-8969ae84ce7d",
    "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": {
        "e8f7fbfe-f726-4abe-ab4e-bd8e322bb2b9": {
            "id": "e8f7fbfe-f726-4abe-ab4e-bd8e322bb2b9",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "name": "free",
            "from": "shipping_decision",
            "to": "free_shipping"
        },
        "4e84c486-8c5f-4b07-98aa-9927eb39ffa8": {
            "id": "4e84c486-8c5f-4b07-98aa-9927eb39ffa8",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "name": "ups",
            "from": "shipping_decision",
            "to": "ups_shipping"
        },
        "c6690a9b-5673-4cc9-acf8-7b992bc5c713": {
            "id": "c6690a9b-5673-4cc9-acf8-7b992bc5c713",
            "weight": 1,
            "async": false,
            "active": true,
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
            "to": "shipping_decision"
        }
    },
    "outTransitions": {
        "shipping_decision": [
            "e8f7fbfe-f726-4abe-ab4e-bd8e322bb2b9",
            "4e84c486-8c5f-4b07-98aa-9927eb39ffa8"
        ]
    },
    "inTransitions": {
        "free_shipping": [
            "e8f7fbfe-f726-4abe-ab4e-bd8e322bb2b9"
        ],
        "ups_shipping": [
            "4e84c486-8c5f-4b07-98aa-9927eb39ffa8"
        ],
        "shipping_decision": [
            "c6690a9b-5673-4cc9-acf8-7b992bc5c713"
        ]
    },
    "tokens": {
        "4e129701-ca1c-405b-8908-c8f6977884c0": {
            "schema": "http:\/\/pvm.forma-pro.com\/schemas\/Token.json",
            "id": "4e129701-ca1c-405b-8908-c8f6977884c0",
            "transitions": [
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "7fa540db-fd30-46af-92ea-7a4ff74e8285",
                    "transitionId": "c6690a9b-5673-4cc9-acf8-7b992bc5c713",
                    "weight": 1,
                    "state": "opened",
                    "time": 15906541826639
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "f1519a40-b074-4a76-b4d1-72f8770d0537",
                    "transitionId": "c6690a9b-5673-4cc9-acf8-7b992bc5c713",
                    "weight": 1,
                    "state": "passed",
                    "time": 15906541826643
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "96db3e88-81fe-4bec-aba2-9d0088a965fb",
                    "transitionId": "4e84c486-8c5f-4b07-98aa-9927eb39ffa8",
                    "weight": 1,
                    "state": "opened",
                    "time": 15906541826646
                },
                {
                    "schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
                    "id": "7f9b3e32-fbe1-486f-add7-8ade79bb5779",
                    "transitionId": "4e84c486-8c5f-4b07-98aa-9927eb39ffa8",
                    "weight": 1,
                    "state": "passed",
                    "time": 15906541826650
                }
            ],
            "total_price": 17
        }
    }
}