/**
* Parses the given source and returns an array which represent a flow
* structure.
*
* This method is to be overriden by the appropriate driver for the given
* file.
*
* @return array
* @throws PIECE_FLOW_ERROR_INVALID_FORMAT
*/
function _parseSource()
{
ob_start();
$dom = domxml_open_mem(file_get_contents($this->_source));
$contents = ob_get_contents();
ob_end_clean();
if (!$dom) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_INVALID_FORMAT, "The file [{$this->_source}] containts invalid format. See below for more details.\n {$contents}");
return;
}
$element = $dom->document_element();
if ($element->has_attribute('firstState')) {
$flow['firstState'] = $element->get_attribute('firstState');
}
$lastState = $element->get_elements_by_tagname('lastState');
if (count($lastState)) {
$flow['lastState'] = array();
if ($lastState[0]->has_attribute('name')) {
$flow['lastState']['name'] = $lastState[0]->get_attribute('name');
}
if ($lastState[0]->has_attribute('view')) {
$flow['lastState']['view'] = $lastState[0]->get_attribute('view');
}
$flow['lastState'] = array_merge($flow['lastState'], $this->_parseState($lastState[0]));
}
$viewStates = $element->get_elements_by_tagname('viewState');
$flow['viewState'] = $this->_parseViewStates($viewStates);
$actionState = $element->get_elements_by_tagname('actionState');
$flow['actionState'] = $this->_parseActionStates($actionState);
$initial = $element->get_elements_by_tagname('initial');
if (count($initial)) {
$flow['initial'] = $this->_parseAction($initial[0]);
}
$final = $element->get_elements_by_tagname('final');
if (count($final)) {
$flow['final'] = $this->_parseAction($final[0]);
}
return $flow;
}
/**
* Creates a new Piece_Flow_Continuation_Server object and configure it.
*
* @return Piece_Flow_Continuation_Server
* @throws PIECE_UNITY_ERROR_INVALID_CONFIGURATION
*/
function &_createContinuationServer()
{
$continuationServer =& new Piece_Flow_Continuation_Server($this->_getConfiguration('enableSingleFlowMode'), $this->_getConfiguration('enableGC'), $this->_getConfiguration('gcExpirationTime'));
$continuationServer->setCacheDirectory($this->_getConfiguration('cacheDirectory'));
$continuationServer->setEventNameCallback(array(__CLASS__, 'getEventName'));
$continuationServer->setFlowExecutionTicketCallback(array(__CLASS__, 'getFlowExecutionTicket'));
$continuationServer->setFlowIDCallback(array(__CLASS__, 'getFlowID'));
if ($this->_getConfiguration('useFlowMappings')) {
$continuationServer->setConfigDirectory($this->_getConfiguration('configDirectory'));
$continuationServer->setConfigExtension($this->_getConfiguration('configExtension'));
foreach ($this->_getConfiguration('flowMappings') as $flowMapping) {
if (array_key_exists('url', $flowMapping)) {
$flowMapping['uri'] = $flowMapping['url'];
}
Piece_Flow_Error::disableCallback();
$continuationServer->addFlow($flowMapping['uri'], $flowMapping['flowName'], $flowMapping['isExclusive']);
Piece_Flow_Error::enableCallback();
if (Piece_Flow_Error::hasErrors()) {
Piece_Unity_Error::push(PIECE_UNITY_ERROR_INVALID_CONFIGURATION, "Failed to configure the plugin [ {$this->_name}.", 'exception', array(), Piece_Flow_Error::pop());
$return = null;
return $return;
}
}
} else {
foreach ($this->_getConfiguration('flowDefinitions') as $flowDefinition) {
Piece_Flow_Error::disableCallback();
$continuationServer->addFlow($flowDefinition['name'], $flowDefinition['file'], $flowDefinition['isExclusive']);
Piece_Flow_Error::enableCallback();
if (Piece_Flow_Error::hasErrors()) {
Piece_Unity_Error::push(PIECE_UNITY_ERROR_INVALID_CONFIGURATION, "Failed to configure the plugin [ {$this->_name}.", 'exception', array(), Piece_Flow_Error::pop());
$return = null;
return $return;
}
}
}
return $continuationServer;
}
/**
* Configures a state.
*
* @param array $state
* @throws PIECE_FLOW_ERROR_PROTECTED_EVENT
*/
function _configureState($state)
{
for ($i = 0, $count = count(@$state['transitions']); $i < $count; ++$i) {
if ($state['transitions'][$i]['event'] == PIECE_FLOW_PROTECTED_EVENT || $this->_fsm->isProtectedEvent($state['transitions'][$i]['event'])) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_PROTECTED_EVENT, "The event [ {$state['transitions'][$i]['event']} ] cannot be used in flow definitions.");
return;
}
$this->_fsm->addTransition($state['name'], $state['transitions'][$i]['event'], $state['transitions'][$i]['nextState'], $this->_wrapEventTriggerAction(@$state['transitions'][$i]['action']), $this->_wrapAction(@$state['transitions'][$i]['guard']));
}
if (array_key_exists('entry', $state)) {
$this->_fsm->setEntryAction($state['name'], $this->_wrapAction(@$state['entry']));
}
if (array_key_exists('exit', $state)) {
$this->_fsm->setExitAction($state['name'], $this->_wrapAction(@$state['exit']));
}
if (array_key_exists('activity', $state)) {
$this->_fsm->setActivity($state['name'], $this->_wrapEventTriggerAction(@$state['activity']));
}
}
/**
* Gets the current state name for the active flow object.
*
* @return string
* @throws PIECE_FLOW_ERROR_INVALID_OPERATION
*/
function getCurrentStateName()
{
if (!$this->_flowExecution->activated()) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_INVALID_OPERATION, __FUNCTION__ . ' method must be called after starting/continuing flows.');
return;
}
$flow =& $this->_flowExecution->getActiveFlow();
return $flow->getCurrentStateName();
}
/**
* Starts a flow execution.
*
* @param mixed &$payload
* @return string
* @throws PIECE_FLOW_ERROR_NOT_FOUND
*/
function _start(&$payload)
{
if (!array_key_exists($this->_activeFlowID, $this->_flowDefinitions)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_FOUND, "The flow ID [ {$this->_activeFlowID} ] not found in the flow definitions.");
return;
}
$flow =& new Piece_Flow();
$flow->configure($this->_flowDefinitions[$this->_activeFlowID]['source'], null, $this->_cacheDirectory, $this->_actionDirectory, $this->_configDirectory, $this->_configExtension);
if (Piece_Flow_Error::hasErrors()) {
return;
}
while (true) {
$flowExecutionTicket = $this->_generateFlowExecutionTicket();
if (!$this->_flowExecution->hasFlowExecution($flowExecutionTicket)) {
$this->_flowExecution->addFlowExecution($flowExecutionTicket, $flow, $this->_activeFlowID);
if ($this->_isExclusive()) {
$this->_flowExecution->markFlowExecutionAsExclusive($flowExecutionTicket, $this->_activeFlowID);
}
break;
}
}
$this->_flowExecution->activateFlowExecution($flowExecutionTicket, $this->_activeFlowID);
$this->_activeFlowExecutionTicket = $flowExecutionTicket;
$flow->setPayload($payload);
$this->_prepareContext();
$flow->start();
if (Piece_Flow_Error::hasErrors()) {
return;
}
return $flowExecutionTicket;
}
/**
* Reads configuration from the given source and creates
* a Piece_Flow_Config object.
*
* @param mixed $source
* @param string $driverName
* @param string $cacheDirectory
* @param string $configDirectory
* @param string $configExtension
* @return Piece_Flow_Config
* @throws PIECE_FLOW_ERROR_NOT_FOUND
* @static
*/
function &read($source, $driverName, $cacheDirectory, $configDirectory, $configExtension)
{
if (!is_callable($source)) {
$flowName = $source;
if (!is_null($configDirectory)) {
$source = str_replace('_', '/', $source);
$source = "{$configDirectory}/{$source}{$configExtension}";
}
if (is_null($driverName)) {
$driverName = strtoupper(substr(strrchr($source, '.'), 1));
if ($driverName != 'YAML' && $driverName != 'XML') {
$driverName = 'YAML';
}
}
if ($driverName == 'XML') {
if (version_compare(phpversion(), '5.0.0', '>=')) {
$driverName = 'XML5';
} else {
$driverName = 'XML4';
}
}
} else {
$driverName = 'PHPArray';
}
$class = "Piece_Flow_ConfigReader_{$driverName}";
if (!Piece_Flow_ClassLoader::loaded($class)) {
Piece_Flow_ClassLoader::load($class);
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
if (!Piece_Flow_ClassLoader::loaded($class)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_FOUND, "The class [ {$class} ] not found in the loaded file.");
$return = null;
return $return;
}
}
$driver =& new $class($source, $cacheDirectory);
$config =& $driver->read();
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
if (!is_callable($source)) {
if (is_null($configDirectory)) {
$flowName = basename($source);
$positionOfExtension = strrpos($flowName, '.');
if ($positionOfExtension !== false) {
$flowName = substr($flowName, 0, $positionOfExtension);
}
}
$config->setName($flowName);
}
return $config;
}
/**
* Parses the given source and returns an array which represent a flow
* structure.
*
* This method is to be overriden by the appropriate driver for the given
* file.
*
* @return array
* @throws PIECE_FLOW_ERROR_INVALID_FORMAT
*/
function _parseSource()
{
$dom = DOMDocument::loadXML(file_get_contents($this->_source));
ob_start();
$validationResult = $dom->relaxNGValidateSource($this->_schema);
$contents = ob_get_contents();
ob_end_clean();
if (!$validationResult) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_INVALID_FORMAT, "The file [{$this->_source}] containts invalid format. See below for more details.\n {$contents}");
return;
}
$element = $dom->getElementsByTagName('flow')->item(0);
if ($element->hasAttribute('firstState')) {
$flow['firstState'] = $element->getAttribute('firstState');
}
$lastState = $element->getElementsByTagName('lastState')->item(0);
if (!is_null($lastState)) {
$flow['lastState'] = array();
if ($lastState->hasAttribute('name')) {
$flow['lastState']['name'] = $lastState->getAttribute('name');
}
if ($lastState->hasAttribute('view')) {
$flow['lastState']['view'] = $lastState->getAttribute('view');
}
$flow['lastState'] = array_merge($flow['lastState'], $this->_parseState($lastState));
}
$flow['viewState'] = $this->_parseViewStates($element->getElementsByTagName('viewState'));
$flow['actionState'] = $this->_parseActionStates($element->getElementsByTagName('actionState'));
$initial = $element->getElementsByTagName('initial')->item(0);
if (!is_null($initial)) {
$flow['initial'] = $this->_parseAction($initial);
}
$final = $element->getElementsByTagName('final')->item(0);
if (!is_null($final)) {
$flow['final'] = $this->_parseAction($final);
}
return $flow;
}
/**
* Starts a flow execution.
*
* @param mixed &$payload
* @return string
* @throws PIECE_FLOW_ERROR_NOT_FOUND
*/
function _start(&$payload)
{
if (!array_key_exists($this->_currentFlowName, $this->_flowDefinitions)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_FOUND, "The flow name [ {$this->_currentFlowName} ] not found in the flow definitions.");
return;
}
$flow =& new Piece_Flow();
$flow->configure($this->_flowDefinitions[$this->_currentFlowName]['file'], null, $this->_cacheDirectory);
if (Piece_Flow_Error::hasErrors()) {
return;
}
while (true) {
$flowExecutionTicket = $this->_generateFlowExecutionTicket();
if (!$this->_hasFlowExecutionTicket($flowExecutionTicket)) {
$this->_flowExecutions[$flowExecutionTicket] =& $flow;
break;
}
}
$this->_currentFlowExecutionTicket = $flowExecutionTicket;
$this->_activated = true;
$flow->setPayload($payload);
$flow->start();
if (Piece_Flow_Error::hasErrors()) {
return;
}
if ($this->_isExclusive()) {
$this->_exclusiveFlowExecutionTicketsByFlowName[$this->_currentFlowName] = $flowExecutionTicket;
$this->_exclusiveFlowNamesByFlowExecutionTicket[$flowExecutionTicket] = $this->_currentFlowName;
}
return $flowExecutionTicket;
}
/**
* Enables the last callback.
*
* @since Method available since Release 1.16.0
*/
function enableCallback()
{
Piece_Flow_Error::popCallback();
}
/**
* Loads an action class corresponding to the given class name.
*
* @param string $class
* @throws PIECE_FLOW_ERROR_NOT_GIVEN
* @throws PIECE_FLOW_ERROR_NOT_FOUND
*/
function load($class)
{
if (!Piece_Flow_ClassLoader::loaded($class)) {
if (is_null($GLOBALS['PIECE_FLOW_Action_Directory'])) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_GIVEN, 'The action directory is not given.');
return;
}
Piece_Flow_ClassLoader::load($class, $GLOBALS['PIECE_FLOW_Action_Directory']);
if (Piece_Flow_Error::hasErrors()) {
return;
}
if (!Piece_Flow_ClassLoader::loaded($class)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_FOUND, "The class [ {$class} ] not found in the loaded file.");
}
}
}
/**
* Removes the payload from the FSM.
*
* @since Method available since Release 1.11.0
*/
function clearPayload()
{
if (!is_a($this->_fsm, 'Stagehand_FSM')) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_INVALID_OPERATION, __FUNCTION__ . ' method must be called after configuring flows.');
return;
}
$this->_fsm->clearPayload();
}
/**
* Loads a class.
*
* @param string $class
* @param string $directory
* @throws PIECE_FLOW_ERROR_NOT_READABLE
* @throws PIECE_FLOW_ERROR_NOT_FOUND
* @throws PIECE_FLOW_ERROR_CANNOT_READ
* @static
*/
function load($class, $directory = null)
{
$file = str_replace('_', '/', $class) . '.php';
if (!is_null($directory)) {
$file = "{$directory}/{$file}";
if (!file_exists($file)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_FOUND, "The class file [ {$file} ] for the class [ {$class} ] is not found.");
return;
}
if (!is_readable($file)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_READABLE, "The class file [ {$file} ] is not readable.");
return;
}
}
if (!(include_once $file)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_CANNOT_READ, "The class file [ {$file} ] is not found or is not readable.");
}
}
/**
* Invokes an event handler in an action.
*
* @param string $eventName
* @param mixed &$payload
* @return string
* @throws PIECE_FLOW_ERROR_NOT_FOUND
*/
function _invokeEventHandler($eventName, &$payload)
{
if (!is_null($this->_actionDirectory)) {
Piece_Flow_Action_Factory::setActionDirectory($this->_actionDirectory);
}
$action =& Piece_Flow_Action_Factory::factory($this->_class);
if (Piece_Flow_Error::hasErrors()) {
return;
}
if (!method_exists($action, $this->_method)) {
Piece_Flow_Error::push(PIECE_FLOW_ERROR_NOT_FOUND, "The method [ {$this->_method} ] does not exist in the action class [ {$this->_class} ].");
return;
}
if (method_exists($action, 'setFlow')) {
$action->setFlow($this->_flow);
}
if (method_exists($action, 'setPayload')) {
$action->setPayload($payload);
}
if (method_exists($action, 'setEvent')) {
$action->setEvent($eventName);
}
if (method_exists($action, 'prepare')) {
$action->prepare();
}
$result = call_user_func(array(&$action, $this->_method));
if (method_exists($action, 'clear')) {
$action->clear();
}
return $result;
}
/**
* Parses the given source and returns a Piece_Flow_Config object.
*
* @return Piece_Flow_Config
* @since Method available since Release 1.11.0
*/
function &_createConfigurationFromSource()
{
$flow = $this->_parseSource();
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
$this->_config =& new Piece_Flow_Config();
$this->_configureFirstState(@$flow['firstState']);
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
$this->_configureLastState(@$flow['lastState']);
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
$this->_configureViewStates(@$flow['viewState']);
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
$this->_configureActionStates(@$flow['actionState']);
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
$this->_configureInitialAction(@$flow['initial']);
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
$this->_configureFinalAction(@$flow['final']);
if (Piece_Flow_Error::hasErrors()) {
$return = null;
return $return;
}
return $this->_config;
}
