The example shows what happens when a tasks throws an exception. Check the failed task node on the graph.
mkdir ~/pvm-exception
cd ~/pvm-exception
composer req formapro/pvm:0.4.x-dev makasim/values:0.5.x-dev
# create such file with the code below
php exception.php
exception.php
foo_task
bar_task
LogicException is caught. Message Something went wrong
exception.php
<?php
use Formapro\Pvm\DefaultBehaviorRegistry;
use Formapro\Pvm\ProcessEngine;
use Formapro\Pvm\Token;
use Formapro\Pvm\ProcessBuilder;
require_once __DIR__.'/vendor/autoload.php';
$process = (new ProcessBuilder())
->createNode('foo_task', 'print_label')->end()
->createNode('bar_task', 'throw_exception')->end()
->createNode('baz_task', 'print_label')->end()
->createTransition('foo_task', 'bar_task')->end()
->createTransition('bar_task', 'baz_task')->end()
->createStartTransition('foo_task')->end()
->getProcess()
;
$engine = new ProcessEngine(new DefaultBehaviorRegistry([
'print_label' => function(Token $token) {
echo $token->getTo()->getId().PHP_EOL;
},
'throw_exception' => function(Token $token) {
echo $token->getTo()->getId().PHP_EOL;
throw new \LogicException('Something went wrong');
},
]));
$engine->setLogException(true);
$token = $engine->createTokenFor($process->getStartTransition());
try {
$engine->proceed($token);
} catch (\Throwable $e) {
echo get_class($e).' is caught. Message '.$e->getMessage().PHP_EOL;
}
{
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Process.json",
"id": "76e75efe-fc5c-4c7b-b5e8-bf808fe14c39",
"nodes": {
"foo_task": {
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Node.json",
"id": "foo_task",
"behavior": "print_label"
},
"bar_task": {
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Node.json",
"id": "bar_task",
"behavior": "throw_exception"
},
"baz_task": {
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Node.json",
"id": "baz_task",
"behavior": "print_label"
}
},
"transitions": {
"e176a87a-2c1e-4cbe-8cb5-3d7ea284de3e": {
"id": "e176a87a-2c1e-4cbe-8cb5-3d7ea284de3e",
"weight": 1,
"async": false,
"active": true,
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
"from": "foo_task",
"to": "bar_task"
},
"2b446d03-838c-48f5-8483-ce32905c1d75": {
"id": "2b446d03-838c-48f5-8483-ce32905c1d75",
"weight": 1,
"async": false,
"active": true,
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
"from": "bar_task",
"to": "baz_task"
},
"61586301-01d8-443f-af1e-3f894a68dddf": {
"id": "61586301-01d8-443f-af1e-3f894a68dddf",
"weight": 1,
"async": false,
"active": true,
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Transition.json",
"to": "foo_task"
}
},
"outTransitions": {
"foo_task": [
"e176a87a-2c1e-4cbe-8cb5-3d7ea284de3e"
],
"bar_task": [
"2b446d03-838c-48f5-8483-ce32905c1d75"
]
},
"inTransitions": {
"bar_task": [
"e176a87a-2c1e-4cbe-8cb5-3d7ea284de3e"
],
"baz_task": [
"2b446d03-838c-48f5-8483-ce32905c1d75"
],
"foo_task": [
"61586301-01d8-443f-af1e-3f894a68dddf"
]
},
"tokens": {
"d4f5cdef-3563-4313-946a-595e4bed5489": {
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/Token.json",
"id": "d4f5cdef-3563-4313-946a-595e4bed5489",
"transitions": [
{
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
"id": "e8c97bec-e75e-4ab1-8f65-e6e4bbe22f62",
"transitionId": "61586301-01d8-443f-af1e-3f894a68dddf",
"weight": 1,
"state": "opened",
"time": 15664792907107
},
{
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
"id": "14c5c11b-9a42-4d8a-9b61-9da6d520f805",
"transitionId": "61586301-01d8-443f-af1e-3f894a68dddf",
"weight": 1,
"state": "passed",
"time": 15664792907114
},
{
"schema": "http:\/\/pvm.forma-pro.com\/schemas\/TokenTransition.json",
"id": "00a0d641-5a44-4a24-8680-ee5450ec204b",
"transitionId": "e176a87a-2c1e-4cbe-8cb5-3d7ea284de3e",
"weight": 1,
"state": "opened",
"time": 15664792907119,
"exception": "LogicException: Something went wrong in \/app\/examples\/7-exception\/exception.php:26\nStack trace:\n#0 [internal function]: App\\Controller\\DemoController->{closure}(Object(Formapro\\Pvm\\Token))\n#1 \/app\/vendor\/formapro\/pvm\/src\/CallbackBehavior.php(31): call_user_func(Object(Closure), Object(Formapro\\Pvm\\Token))\n#2 \/app\/vendor\/formapro\/pvm\/src\/ProcessEngine.php(125): Formapro\\Pvm\\CallbackBehavior->execute(Object(Formapro\\Pvm\\Token))\n#3 \/app\/vendor\/formapro\/pvm\/src\/ProcessEngine.php(251): Formapro\\Pvm\\ProcessEngine->doProceed(Object(Formapro\\Pvm\\Token))\n#4 \/app\/vendor\/formapro\/pvm\/src\/ProcessEngine.php(188): Formapro\\Pvm\\ProcessEngine->transition(Object(Formapro\\Pvm\\Token))\n#5 \/app\/vendor\/formapro\/pvm\/src\/ProcessEngine.php(78): Formapro\\Pvm\\ProcessEngine->doProceed(Object(Formapro\\Pvm\\Token))\n#6 \/app\/examples\/7-exception\/exception.php(35): Formapro\\Pvm\\ProcessEngine->proceed(Object(Formapro\\Pvm\\Token))\n#7 \/app\/src\/Controller\/DemoController.php(36): require_once('\/app\/examples\/7...')\n#8 \/app\/vendor\/symfony\/http-kernel\/HttpKernel.php(149): App\\Controller\\DemoController->__invoke('exception', Object(Twig_Environment), Object(App\\Service\\GetExamplesService), Object(App\\Service\\CleanOldFileProcessesService))\n#9 \/app\/vendor\/symfony\/http-kernel\/HttpKernel.php(66): Symfony\\Component\\HttpKernel\\HttpKernel->handleRaw(Object(Symfony\\Component\\HttpFoundation\\Request), 1)\n#10 \/app\/vendor\/symfony\/http-kernel\/Kernel.php(188): Symfony\\Component\\HttpKernel\\HttpKernel->handle(Object(Symfony\\Component\\HttpFoundation\\Request), 1, true)\n#11 \/app\/public\/index.php(37): Symfony\\Component\\HttpKernel\\Kernel->handle(Object(Symfony\\Component\\HttpFoundation\\Request))\n#12 {main}"
}
]
}
}
}