85 lines
2.3 KiB
PHP
85 lines
2.3 KiB
PHP
<?php
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namespace Icinga\Monitoring;
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use Icinga\Application\Config;
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use Icinga\Authentication\Manager as AuthManager;
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use Exception;
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class Backend
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{
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protected static $instances = array();
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protected static $backendConfigs;
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final protected function __construct()
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{
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}
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public static function exists($name)
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{
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$configs = self::getBackendConfigs();
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return array_key_exists($name, $configs);
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}
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public static function getDefaultName()
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{
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$configs = self::getBackendConfigs();
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if (empty($configs)) {
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throw new Exception(
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'Cannot get default backend as no backend has been configured'
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);
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}
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reset($configs);
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return key($configs);
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}
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public function getBackendConfigs()
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{
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if (self::$backendConfigs === null) {
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$config = Config::getInstance()->backends;
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$backends = $config->backends;
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foreach ($backends as $name => $config) {
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// TODO: Check if access to this backend is allowed
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self::$backendConfigs[$name] = $config;
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}
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}
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return self::$backendConfigs;
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}
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public function getBackend($name = null)
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{
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if (! array_key_exists($name, self::$instances)) {
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if ($name === null) {
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$name = self::getDefaultName();
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} else {
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if (! self::exists($name)) {
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throw new Exception(sprintf(
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'There is no such backend: "%s"',
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$name
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));
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}
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}
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$config = self::$backendConfigs[$name];
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$type = $config->type;
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$type[0] = strtoupper($type[0]);
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$class = '\\Icinga\\Monitoring\\Backend\\' . $type;
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self::$instances[$name] = new $class($config);
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}
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return self::$instances[$name];
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}
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public static function getInstance($name = null)
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{
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if (array_key_exists($name, self::$instances)) {
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return self::$instances[$name];
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} else {
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if ($name === null) {
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// TODO: Remove this, will be chosen by Environment
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$name = AuthManager::getInstance()->getSession()->get('backend');
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}
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return self::getBackend($name);
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}
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}
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}
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