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<?php |
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declare(strict_types = 1); |
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/* |
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* This file is part of the StateMachine package |
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* |
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* (c) Michal Wachowski <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace StateMachine; |
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use StateMachine\Payload\PayloadEnvelope; |
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/** |
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* State machine |
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* |
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* @package StateMachine |
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*/ |
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class StateMachine |
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{ |
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const ON_STATE_WAS_SET = 'onStateWasSet'; |
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/** |
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* Schema adapter |
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* |
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* @var ProcessInterface |
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*/ |
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private $process; |
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/** |
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* Constructor |
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* |
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* @param Process $process |
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*/ |
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public function __construct(Process $process) |
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{ |
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$this->process = $process; |
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} |
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/** |
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* Trigger event for subject identified by identifier |
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* Restore subject from handler by its identifier, then triggers event and saves subject |
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* Return run history |
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* |
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* @param string $event |
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* @param PayloadEnvelope $payload |
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*/ |
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public function triggerEvent($event, PayloadEnvelope $payload) |
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{ |
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if ($payload->state() === null) { |
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$this->updatePayload($this->process->initialState(), $payload); |
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} |
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$state = $this->process->state($payload->state()); |
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$nextStateName = $state->triggerEvent($event, $payload); |
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if ($nextStateName === null) { |
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return; |
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} |
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$state = $this->process->state($nextStateName); |
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$this->updatePayload($state, $payload); |
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$this->handleOnStateWasSet($state, $payload); |
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} |
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/** |
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* Handles onStateWasSet event |
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* Returns true if there was state change |
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* |
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* @param State $state |
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* @param PayloadEnvelope $payload |
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*/ |
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private function handleOnStateWasSet(State $state, PayloadEnvelope $payload) |
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{ |
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while ($state->hasEvent(self::ON_STATE_WAS_SET)) { |
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$newState = $state->triggerEvent(self::ON_STATE_WAS_SET, $payload); |
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2 |
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if ($newState === null) { |
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break; |
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} |
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$state = $this->process->state($newState); |
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$this->updatePayload($state, $payload); |
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} |
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} |
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/** |
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* Update payload with new state data |
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* |
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* @param State $state |
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* @param PayloadEnvelope $payload |
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*/ |
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private function updatePayload(State $state, PayloadEnvelope $payload) |
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{ |
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$payload->changeState($state->name()); |
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} |
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} |
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potfur /
statemachine
