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diff --git a/extras/vom/vom/gbp_contract.hpp b/extras/vom/vom/gbp_contract.hpp
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+/*
+ * Copyright (c) 2017 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_CONTRACT_H__
+#define __VOM_GBP_CONTRACT_H__
+
+#include "vom/acl_list.hpp"
+#include "vom/gbp_endpoint.hpp"
+#include "vom/interface.hpp"
+#include "vom/singular_db.hpp"
+#include "vom/types.hpp"
+
+namespace VOM {
+
+/**
+ * A entry in the ARP termination table of a Bridge Domain
+ */
+class gbp_contract : public object_base
+{
+public:
+  /**
+   * The key for a contract is the pari of EPG-IDs
+   */
+  typedef std::pair<epg_id_t, epg_id_t> key_t;
+
+  /**
+   * Construct a GBP contract
+   */
+  gbp_contract(epg_id_t src_epg_id,
+               epg_id_t dst_epg_id,
+               const ACL::l3_list& acl);
+
+  /**
+   * Copy Construct
+   */
+  gbp_contract(const gbp_contract& r);
+
+  /**
+   * Destructor
+   */
+  ~gbp_contract();
+
+  /**
+   * Return the object's key
+   */
+  const key_t key() const;
+
+  /**
+   * comparison operator
+   */
+  bool operator==(const gbp_contract& bdae) const;
+
+  /**
+   * Return the matching 'singular instance'
+   */
+  std::shared_ptr<gbp_contract> singular() const;
+
+  /**
+   * Find the instnace of the bridge_domain domain in the OM
+   */
+  static std::shared_ptr<gbp_contract> 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;
+
+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_contract& obj);
+
+  /**
+   * Find or add the instance of the contract domain in the OM
+   */
+  static std::shared_ptr<gbp_contract> find_or_add(const gbp_contract& 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_contract>;
+
+  /**
+   * Sweep/reap the object if still stale
+   */
+  void sweep(void);
+
+  /**
+   * HW configuration for the result of creating the endpoint
+   */
+  HW::item<bool> m_hw;
+
+  /**
+   * The source EPG ID
+   */
+  epg_id_t m_src_epg_id;
+
+  /**
+   * The destination EPG ID
+   */
+  epg_id_t m_dst_epg_id;
+
+  /**
+   * The ACL applied to traffic between the gourps
+   */
+  std::shared_ptr<ACL::l3_list> m_acl;
+
+  /**
+   * A map of all bridge_domains
+   */
+  static singular_db<key_t, gbp_contract> m_db;
+};
+
+std::ostream& operator<<(std::ostream& os, const gbp_contract::key_t& key);
+}; // namespace
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "mozilla")
+ * End:
+ */
+
+#endif