BackendInterface: Add phpDocs

library/Director/Integration/BackendInterface.php

@@ -6,15 +6,57 @@ use Icinga\Web\Url;
 
 interface BackendInterface
 {
+    /**
+     * Whether the backend is available
+     *
+     * @return bool
+     */
     public function isAvailable(): bool;
 
+    /**
+     * Whether the backend has the given host
+     *
+     * @param string $hostname
+     *
+     * @return bool
+     */
     public function hasHost(string $hostname): bool;
 
+    /**
+     * Whether the backend has the given service of the specified host
+     *
+     * @param string $hostname
+     * @param string $service
+     *
+     * @return bool
+     */
     public function hasService(string $hostname, string $service): bool;
 
+    /**
+     * Whether an authenticated user has the permission (is not restricted) to modify given host
+     *
+     * @param string $hostName
+     *
+     * @return bool
+     */
     public function canModifyHost(string $hostName): bool;
 
+    /**
+     * Whether an authenticated user has the permission (is not restricted) to modify given service of specified host
+     *
+     * @param string $hostName
+     * @param string $serviceName
+     *
+     * @return bool
+     */
     public function canModifyService(string $hostName, string $serviceName): bool;
 
+    /**
+     * Get the url of given host
+     *
+     * @param string $hostname
+     *
+     * @return Url
+     */
     public function getHostUrl(string $hostname): Url;
 }