php - 为什么我会收到这些 Zend_Application_Resources 的循环依赖异常？

Question

我在制作新资源时不断遇到以下异常，但我不明白为什么:

PHP Fatal error:  Uncaught exception 'Zend_Application_Bootstrap_Exception' with message 'Circular resource dependency detected' in /opt/local/lib/php/Zend/Application/Bootstrap/BootstrapAbstract.php:656
Stack trace:
#0 /opt/local/lib/php/Zend/Application/Bootstrap/BootstrapAbstract.php(623): Zend_Application_Bootstrap_BootstrapAbstract->_executeResource('modules')
#1 /opt/local/lib/php/Zend/Application/Bootstrap/BootstrapAbstract.php(580): Zend_Application_Bootstrap_BootstrapAbstract->_bootstrap('modules')
#2 /Library/WebServer/Documents/doctrine-dev/library/APP/Doctrine/Application/Resource/Doctrine.php(36): Zend_Application_Bootstrap_BootstrapAbstract->bootstrap('modules')
#3 /opt/local/lib/php/Zend/Application/Bootstrap/BootstrapAbstract.php(708): APP_Doctrine_Application_Resource_Doctrine->__construct(Array)
#4 /opt/local/lib/php/Zend/Application/Bootstrap/BootstrapAbstract.php(349): Zend_Application_Bootstrap_BootstrapAbstract->_loadPluginResource('doctrine', Array)
#5 /opt/local/lib/php/Zend/Application/Bootstrap/Bootstra in /opt/local/lib/php/Zend/Application/Bootstrap/BootstrapAbstract.php on line 656

正如您将在下面看到的，我创建了一个 Doctrine 资源，该资源应该仅在通用应用程序 Bootstrap 中加载。为了执行其任务，它需要引导模块资源 所以它调用$this->getBootstrap()->bootstrap('modules')。不过，模块资源从不调用 Doctrine，这似乎是我获得循环依赖的地方。我已经尝试过当前在我的 Doctrine 资源的构造函数中的代码也直接作为 init 的一部分，但这似乎也不起作用。但对我来说更大的谜团是，如果我调用 $bootstrap->bootstrap('modules') 在调用 $bootstrap->bootstrap('doctrine') 之前，它本身似乎运行得很好。那么为什么会出现循环引用问题呢？

application.xml的相关部分

<resources>
    <frontController>
        <controllerDirectory><zf:const zf:name="APPLICATION_PATH" />/controllers</controllerDirectory>
        <moduleDirectory><zf:const zf:name="APPLICATION_PATH" />/modules</moduleDirectory>
        <moduleControllerDirectoryName value="controllers" />
    </frontController>
    <modules prefixModuleName="Mod" configFilename="module.xml">
        <enabledModules>
            <default />
            <doctrinetest />
            <cms>
                <myOption value="Test Option Value" />
            </cms>
            <menu somevar="menu" />
            <article somevar="article" />
        </enabledModules>
    </modules>
    <doctrine>
        <connections>
            <default dsn="mysql://#####:#####@localhost/#####">
              <attributes useNativeEnum="1" />
            </default>
        </connections>
        <attributes>
          <autoAccessorOverride value="1" />
          <autoloadTableClasses value="1" />
          <modelLoading value="MODEL_LOADING_PEAR" />
        </attributes>
        <directoryNames>
            <sql value="data/sql" />
            <fixtures value="data/fixtures" />
            <migrations value="data/migrations" />
            <yaml value="configs/schemas" />
            <models value="models" />
        </directoryNames>
    </doctrine>
</resources>

Doctrine 资源

<?php

class APP_Doctrine_Application_Resource_Doctrine extends Zend_Application_Resource_ResourceAbstract
{
    protected $_manager = null;
    protected $_modules = array();
    protected $_attributes = null;
    protected $_connections = array();
    protected $_defaultConnection = null;
    protected $_directoryNames = null;
    protected $_inflectors = array();



    public function __construct($options = null)
    {

        parent::__construct($options);
        $bootstrap = $this->getBootstrap();       


        $autoloader = $bootstrap->getApplication()->getAutoloader();

        $autoloader->pushAutoloader(array('Doctrine_Core', 'autoload'), 'Doctrine');
        spl_autoload_register(array('Doctrine_Core', 'modelsAutoload'));

        $manager = $this->getManager();
        $manager->setAttribute('bootstrap', $bootstrap);

        // default module uses the application bootstrap unless overridden!
        $modules = array('default' => $bootstrap);

        if(!isset($options['useModules']) || 
          (isset($options['useModules']) && (boolean) $options['useModules']))
        {
            $moduleBootstraps = $bootstrap->bootstrap('modules')->getResource('modules');   
            $modules = array_merge($modules, $moduleBootstraps->getArrayCopy()); 
        }                               

        $this->setModules($modules); // configure the modules
        $this->_loadModels(); // load all the models for Doctrine
    }

    public function init()
    {
        return $this->getManager();
    }

    public function setConnections(array $connections)
    {
        $manager = $this->getManager();

        foreach($connections as $name => $config)
        {
            if(isset($config['dsn']))
            {
              $conn = $manager->connection($config['dsn'], $name);        
            }

            if(isset($config['attributes']) && isset($conn))
            {
              $this->setAttributes($config['attributes'], $conn);    
            }
        }

        return $this;
    }

    public function setAttributes(array $attributes, Doctrine_Configurable $object = null)
    {
        if($object === null)
        {
            $object = $this->getManager();
        }

        foreach($attributes as $name => $value)
        {
            $object->setAttribute(
              $this->doctrineConstant($name, 'attr'),
              $this->doctrineConstant($value)
            );
        }

        return $this;
    }

    public function setModules(array $modules)
    {
        //$this->_modules = $modules;

        foreach($modules as $name => $bootstrap)
        {
            $this->_modules[$name] = $this->_configureModuleOptions($bootstrap);
        }

        return $this;
    }

    public function setDirectoryNames(array $directoryNames)
    {
        $this->_directoryNames = $directoryNames;

        return $this;
    }

    public function getDirectoryNames()
    {
        return $this->_directoryNames;
    }

    public function getDirectoryName($key)
    {
        if(isset($this->_directoryNames[$key]))
        {
            return $this->_directoryNames[$key];
        }

        return null;
    }

    public function getModuleOptions($module = null)
    {
         if($module === null)
         {
             return $this->_modules;
         }

         if(isset($this->_modules[$module]))
         {
             return $this->_modules[$module];
         }

         return null;
    }

    public function doctrineConstant($value, $prefix = '')
    {  
        if($prefix !== '')
        {
            $prefix .= '_';
        }

        $const = $this->_getConstantInflector()->filter(array(
          'prefix'=>$prefix, 
          'key' => $value
        ));

        $const = constant($const);
        return $const !== null ? $const : $value;
    }

    /**
     * getManager
     * @return Doctrine_Manager
     */
    public function getManager()
    {
        if(!$this->_manager)
        {
            $this->_manager = Doctrine_Manager::getInstance();
        }

        return $this->_manager;
    }

    protected function _getConstantInflector()
    {
        if(!isset($this->_inflectors['constant']))
        {
            $callback = new Zend_Filter_Callback(array('callback'=>'ucfirst'));
            $this->_inflectors['constant'] = new Zend_Filter_Inflector(
              'Doctrine_Core::#prefix#key', 
               array(
                  ':prefix' => array($callback, 'Word_CamelCaseToUnderscore', 'StringToUpper'),
                  ':key' => array('Word_SeparatorToCamelCase', 'Word_CamelCaseToUnderscore', 'StringToUpper')
               ), null, '#');
        }

        return $this->_inflectors['constant'];
    }

    protected function _configureModuleOptions(Zend_Application_Bootstrap_BootstrapAbstract $bootstrap)
    {
        $coreBootstrapClass = get_class($this->getBootstrap());

        if(get_class($bootstrap) === $coreBootstrapClass)
        {
            // handled differently
            $resourceLoader = $bootstrap->bootstrap('DefaultAutoloader')->getResource('DefaultAutoloader');
            $moduleName = $resourceLoader->getNamespace();
        }
        else
        {
            // handle a module bootstrap
            $resourceLoader = $bootstrap->getResourceLoader();
            $moduleName = $bootstrap->getModuleName();
        }

        $resourceTypes = $resourceLoader->getResourceTypes();
        $modelResource = isset($resourceTypes['model']) 
          ? $resourceTypes['model'] 
          : array('path'=>'models', 'namespace'=>'Model');

        $modulePath = $resourceLoader->getBasePath();

        $classPrefix = $modelResource['namespace'];
        $modelsPath = $modelResource['path'];

        $doctrineOptions = array(
            'generateBaseClasses'=>TRUE,
            'generateTableClasses'=>TRUE,
            'baseClassPrefix'=>'Base_',
            'baseClassesDirectory'=> NULL,
            'baseTableClassName'=>'Doctrine_Table',
            'generateAccessors' => true,
            'classPrefix'=>"{$classPrefix}_",
            'classPrefixFiles'=>FALSE,
            'pearStyle'=>TRUE,
            'suffix'=>'.php',
            'phpDocPackage'=> $moduleName,
            'phpDocSubpackage'=>'Models',
        );

        $doctrineConfig = array(
            'data_fixtures_path' => "$modulePath/{$this->getDirectoryName('fixtures')}",
            'models_path' => "$modelsPath",
            'migrations_path' => "$modulePath/{$this->getDirectoryName('migrations')}",
            'yaml_schema_path' => "$modulePath/{$this->getDirectoryName('yaml')}",
            'sql_path' => "$modulePath/{$this->getDirectoryName('sql')}",
            'generate_models_options' => $doctrineOptions 
        );

        return $doctrineConfig;
    }

    protected function _loadModels()
    {
        $moduleOptions = $this->getModuleOptions();

        foreach($moduleOptions as $module => $options)
        {
            Doctrine_Core::loadModels(
              $options['models_path'], 
              Doctrine_Core::MODEL_LOADING_PEAR, 
              $options['generate_models_options']['classPrefix']
            );
        }

        return $this;
    }
}

模块资源

<?php
class APP_Application_Resource_Modules extends Zend_Application_Resource_Modules
{
    protected $_prefixModuleNames = false;
    protected $_moduleNamePrefix = null;
    protected $_defaultModulePrefix = 'Mod';
    protected $_configFileName = 'module.xml';
    protected $_enabledModules = null;

    public function __construct($options = null)
    {
        if(isset($options['prefixModuleName']))
        {
            if(($prefix = APP_Toolkit::literalize($options['prefixModuleName']))
                !== false)
            {
                $this->_prefixModuleNames = true;
                $this->_moduleNamePrefix = is_string($prefix)
                    ? $prefix
                    : $this->_defaultModulePrefix;
            }
        }

        if(isset($options['configFileName']))
        {
            $this->_configFileName = $options['configFileName'];
        }


        parent::__construct($options);
    }

    protected function _mergeModuleConfigs(array $applicationConfig)
    {
       $cacheManager = $this->_getCacheManager();

        if(isset($applicationConfig['resources']['modules']['enabledModules']))
        {
            $applicationModulesOptions = &$applicationConfig['resources']['modules'];
            $enabledModules = &$applicationModulesOptions['enabledModules'];

            $front = $this->getBootstrap()->getResource('frontcontroller');

            foreach($enabledModules as $moduleName => $moduleOptions)
            {

                // cache testing
                // note cache keys for modules are prefixed if prefix is enabled @see _formatModuleName
                if(!$cacheManager->test('config', $this->_formatModuleName($moduleName)))
                {

                    $configPath = $front->getModuleDirectory($moduleName).'/configs/'.$this->getConfigFilename();

                    if(file_exists($configPath))
                    {
                        if(strpos($configPath, ".xml") === false)
                        {
                            throw new Exception(__CLASS__." is only compatible with XML configuration files.");
                        }

                        $config = new Zend_Config_Xml($configPath);
                        $enabledModules[$moduleName] = array_merge((array) $moduleOptions, $config->toArray());

                        //$this->setOptions($options);
                        $cacheManager->save('config', $enabledModules[$moduleName], $this->_formatModuleName($moduleName));
                    }
                }
                else
                {
                    $options = $cacheManager->load('config', $this->_formatModuleName($moduleName));
                    $enabledModules[$moduleName] = array_merge((array) $enabledModules[$moduleName], $options);
                }
            }
        }

        return $applicationConfig;
    }

    public function init()
    {
        /**
         * @var Zend_Application_Bootstrap_BoostrapAbstract
         */

        $bootstrap = $this->getBootstrap();

        if(!$bootstrap->hasResource('frontController'))
        {
            $bootstrap->bootstrap('frontController');
        }

        $front = $bootstrap->getResource('frontController');

        $applicationConfig = $this->_mergeModuleConfigs($bootstrap->getOptions());
        $bootstrap->setOptions($applicationConfig);

        parent::init();


        return $this->_bootstraps;

    }

    /**
     * Format a module name to the module class prefix
     *
     * @param  string $name
     * @return string
     */
    protected function _formatModuleName($name)
    {

        $name = strtolower($name);
        $name = str_replace(array('-', '.'), ' ', $name);
        $name = ucwords($name);
        $name = str_replace(' ', '', $name);
        $options = $this->getOptions();

        if($this->prefixEnabled())
        {
            $name = $this->getModuleNamePrefix().$name;

        }

        return $name;
    }

    protected function _getCacheManager()
    {
        $bootstrap = $this->getBootstrap();

        if(!$bootstrap->hasResource('cacheManager'))
        {
            $bootstrap->bootstrap('cacheManager');
        }

        return $bootstrap->getResource('cacheManager');
    }

    public function prefixEnabled()
    {
        return $this->_prefixModuleNames;
    }

    public function getModuleNamePrefix()
    {
        return $this->_moduleNamePrefix;
    }

    public function getConfigFilename()
    {
        return $this->_configFileName;
    }

    public function setEnabledModules($modules)
    {
        $this->_enabledModules = (array) $modules;
    }

    public function getEnabledModules($controllerDirectories = null)
    {
        if($controllerDirectories instanceof Zend_Controller_Front)
        {
            $controllerDirectories = $controllerDirectories->getControllerDirectory();
        }

        if(is_array($controllerDirectories))
        {
            $options = $this->getOptions();

            $enabledModules = isset($options['enabledModules'])
                ? (array) $options['enabledModules']
                : array();

            $this->_enabledModules =  array_intersect_key($controllerDirectories, $enabledModules);

        }
        elseif(null !== $controllerDirectories)
        {
            throw new InvalidArgumentException('Argument must be an instance of
                Zend_Controller_Front or an array mathing the format of the
                return value of Zend_Controller_Front::getControllerDirectory().'
            );
        }

        return $this->_enabledModules;
    }

    public function setPrefixModuleName($value)
    {
       $this->_prefixModuleNames = APP_Toolkit::literalize($value);
    }
}

模块引导基类

<?php

class APP_Application_Module_Bootstrap extends Zend_Application_Module_Bootstrap
{
    public function _initResourceLoader()
    {
        $loader = $this->getResourceLoader();
        $loader->addResourceType('actionhelper', 'helpers', 'Action_Helper');
    }
}

Answer 1

也许电子书“Survive the Deep End”的这一部分可能对您有帮助:6.6. Step 5: Fixing ZFExt_Bootstrap -- 它具体说明了您遇到的错误。

(我不会引用，因为有很多很长的段落，但是希望这会有所帮助)