monitoring/commands: Add `CommandTransportInterface'

All concrete Icinga command transport classes should implement the `CommandTransportInterface' .

refs #6593

modules/monitoring/library/Monitoring/Command/Transport/CommandTransportInterface.php

@@ -0,0 +1,22 @@
+<?php
+// {{{ICINGA_LICENSE_HEADER}}}
+// {{{ICINGA_LICENSE_HEADER}}}
+
+namespace Icinga\Module\Monitoring\Command\Transport;
+
+use Icinga\Module\Monitoring\Command\IcingaCommand;
+
+/**
+ * Interface for Icinga command transports
+ */
+interface CommandTransportInterface
+{
+    /**
+     * Send the command
+     *
+     * @param   IcingaCommand $command
+     *
+     * @throws  \Icinga\Module\Monitoring\Command\Exception\TransportException
+     */
+    public function send(IcingaCommand $command);
+}