--- /dev/null
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __VOM_GBP_EXT_ITF_H__
+#define __VOM_GBP_EXT_ITF_H__
+
+#include "vom/gbp_bridge_domain.hpp"
+#include "vom/gbp_route_domain.hpp"
+#include "vom/interface.hpp"
+#include "vom/singular_db.hpp"
+
+namespace VOM {
+/**
+ * A enternal interface for GBP
+ */
+class gbp_ext_itf : public object_base
+{
+public:
+ /**
+ * The key for a GBP ext_itf interface
+ */
+ typedef interface::key_t key_t;
+
+ /**
+ * Construct a GBP ext_itf
+ */
+ gbp_ext_itf(const interface& itf,
+ const gbp_bridge_domain& gbd,
+ const gbp_route_domain& grd);
+
+ /**
+ * Copy Construct
+ */
+ gbp_ext_itf(const gbp_ext_itf& r);
+
+ /**
+ * Destructor
+ */
+ ~gbp_ext_itf();
+
+ /**
+ * Return the object's key
+ */
+ const key_t key() const;
+
+ /**
+ * comparison operator
+ */
+ bool operator==(const gbp_ext_itf& bdae) const;
+
+ /**
+ * Return the matching 'singular instance'
+ */
+ std::shared_ptr<gbp_ext_itf> singular() const;
+
+ /**
+ * Find the instnace of the ext_itf interface in the OM
+ */
+ static std::shared_ptr<gbp_ext_itf> find(const key_t& k);
+
+ /**
+ * Dump all bridge_domain-doamin into the stream provided
+ */
+ static void dump(std::ostream& os);
+
+ /**
+ * replay the object to create it in hardware
+ */
+ void replay(void);
+
+ /**
+ * Convert to string for debugging
+ */
+ std::string to_string() const;
+
+ /**
+ * return the ext_itfulation interface's handle
+ */
+ const handle_t& handle() const;
+
+private:
+ /**
+ * Class definition for listeners to OM events
+ */
+ class event_handler : public OM::listener, public inspect::command_handler
+ {
+ public:
+ event_handler();
+ virtual ~event_handler() = default;
+
+ /**
+ * Handle a populate event
+ */
+ void handle_populate(const client_db::key_t& key);
+
+ /**
+ * Handle a replay event
+ */
+ void handle_replay();
+
+ /**
+ * Show the object in the Singular DB
+ */
+ void show(std::ostream& os);
+
+ /**
+ * Get the sortable Id of the listener
+ */
+ dependency_t order() const;
+ };
+
+ /**
+ * event_handler to register with OM
+ */
+ static event_handler m_evh;
+
+ /**
+ * Commit the acculmulated changes into VPP. i.e. to a 'HW" write.
+ */
+ void update(const gbp_ext_itf& obj);
+
+ /**
+ * Find or add the instnace of the bridge_domain domain in the OM
+ */
+ static std::shared_ptr<gbp_ext_itf> find_or_add(const gbp_ext_itf& temp);
+
+ /*
+ * It's the VPPHW class that updates the objects in HW
+ */
+ friend class OM;
+
+ /**
+ * It's the singular_db class that calls replay()
+ */
+ friend class singular_db<key_t, gbp_ext_itf>;
+
+ /**
+ * Sweep/reap the object if still stale
+ */
+ void sweep(void);
+
+ /**
+ * HW configuration for the result of creating the ext_itf
+ */
+ HW::item<bool> m_hw;
+
+ /**
+ * The interface the ext_itf is attached to.
+ */
+ std::shared_ptr<interface> m_itf;
+
+ /**
+ * The BD & RD the ext_itf is in
+ */
+ std::shared_ptr<gbp_bridge_domain> m_bd;
+ std::shared_ptr<gbp_route_domain> m_rd;
+
+ /**
+ * A map of all bridge_domains
+ */
+ static singular_db<key_t, gbp_ext_itf> m_db;
+};
+
+}; // namespace VOM
+
+/*
+ * fd.io coding-style-patch-verification: OFF
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif
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