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<?php
namespace gipfl\IcingaCliDaemon;
use RuntimeException;
trait StateMachine
{
/** @var string */
private $currentState;
/** @var array [fromState][toState] = [callback, ...] */
private $allowedTransitions = [];
/** @var array [state] = [callback, ...] */
private $onState = [];
public function initializeStateMachine($initialState)
{
if ($this->currentState !== null) {
throw new RuntimeException('StateMachine has already been initialized');
}
$this->currentState = $initialState;
}
/**
* @param string|array $fromState
* @param string $toState
* @param callable $callback
* @return $this
*/
public function onTransition($fromState, $toState, $callback)
{
if (is_array($fromState)) {
foreach ($fromState as $state) {
$this->onTransition($state, $toState, $callback);
}
} else {
$this->allowTransition($fromState, $toState);
$this->allowedTransitions[$fromState][$toState][] = $callback;
}
return $this;
}
public function allowTransition($fromState, $toState)
{
if (! isset($this->allowedTransitions[$fromState][$toState])) {
$this->allowedTransitions[$fromState][$toState] = [];
}
return $this;
}
/**
* @param $state
* @param $callback
* @return $this
*/
public function onState($state, $callback)
{
if (! isset($this->onState[$state])) {
$this->onState[$state] = [];
}
$this->onState[$state][] = $callback;
return $this;
}
public function getState()
{
if ($this->currentState === null) {
throw new RuntimeException('StateMachine has not been initialized');
}
return $this->currentState;
}
public function setState($state)
{
$fromState = $this->getState();
if ($this->canTransit($fromState, $state)) {
$this->currentState = $state;
$this->runStateTransition($fromState, $state);
} else {
throw new RuntimeException(sprintf(
'A transition from %s to %s is not allowed',
$fromState,
$state
));
}
}
private function runStateTransition($fromState, $toState)
{
if (isset($this->allowedTransitions[$fromState][$toState])) {
foreach ($this->allowedTransitions[$fromState][$toState] as $callback) {
$callback();
}
}
if (isset($this->onState[$toState])) {
foreach ($this->onState[$toState] as $callback) {
$callback();
}
}
}
public function canTransit($fromState, $toState)
{
return isset($this->allowedTransitions[$fromState][$toState]);
}
}
|
