module opendaylight-flow-statistics {
    namespace "urn:opendaylight:flow:statistics";
    prefix flowstat;

    import yang-ext {prefix ext; revision-date "2013-07-09";}
    import ietf-yang-types {prefix yang; revision-date "2010-09-24";}   
    import opendaylight-inventory {prefix inv;revision-date "2013-08-19";}
    import opendaylight-flow-types {prefix flow-types;revision-date "2013-10-26";}
    import opendaylight-statistics-types {prefix stat-types;revision-date "2013-09-25";}
    import flow-node-inventory {prefix flow-node;revision-date "2013-08-19";}
    import flow-capable-transaction {prefix tr;}
    import sal-flow {prefix flow;}
    

    revision "2013-08-19" {
        description "Initial revision of flow statistics service";
    }
	
	//Augment flow statistics data to the flow-capable-node->table->flow
	augment "/inv:nodes/inv:node/flow-node:table/flow-node:flow" {
        ext:augment-identifier "flow-statistics-data";
        uses flow-statistics;
    }
	
	grouping flow-statistics {
        container flow-statistics {
            //config "false";
	        uses flow-types:flow;
	        uses stat-types:generic-statistics;
        }
	}    
	
	typedef flow-id {
		description "flow id";
		type yang:counter32;
	}
	
	grouping flow-and-statistics-map-list {
		description "List of flow and statistics map";
		list flow-and-statistics-map-list {
			key "flow-id";
			leaf flow-id {
				type flow-id;
			}
			uses flow-and-statistics-map;
		}
	}
	
	grouping flow-and-statistics-map{
		description "Mapping between flow and its statistics";
		uses flow-types:flow;
		uses stat-types:generic-statistics;
	}
	
    // RPC calls to fetch flow statistics
    rpc get-all-flows-statistics-from-all-flow-tables {
    	description "Fetch statistics of all the flow present in all the flow tables of the switch"; 
        input {
            uses inv:node-context-ref;
        }
        output {
            uses flow-and-statistics-map-list;
            uses tr:transaction-aware;
        }
    
    }

    rpc get-all-flow-statistics-from-flow-table {
    	description "Fetch statistics of all the flow present in the specific flow table of the switch"; 
        input {
            uses inv:node-context-ref;
            leaf table-id {
            	type flow-types:table-id;
            }
        }
        output {
            uses flow-and-statistics-map-list;
            uses tr:transaction-aware;
        }
    }

    rpc get-flow-statistics-from-flow-table {
    	description "Fetch statistics of the specific flow present in the specific flow table of the switch"; 
        input {
            uses inv:node-context-ref;
            uses flow-types:flow;
        }
        output {
            uses flow-and-statistics-map-list;
            uses tr:transaction-aware;
        }
    }

    notification flows-statistics-update {
    	description "Flows statistics sent by switch";
		leaf moreReplies {
            type boolean;
        }
        uses inv:node;
		uses flow-and-statistics-map-list;
		uses tr:transaction-aware;
    }

	//Models for aggregate flow statistics collection
	augment "/inv:nodes/inv:node/flow-node:table" {
        ext:augment-identifier "aggregate-flow-statistics-data";
        uses aggregate-flow-statistics;
    }
	
	grouping aggregate-flow-statistics {
        container aggregate-flow-statistics {
            //config "false";
	        uses stat-types:aggregate-flow-statistics;
        }
	}    
	
    // RPC calls to fetch flow statistics
    rpc get-aggregate-flow-statistics-from-flow-table-for-all-flows {
    	description "Fetch aggregate statistics for all the flows present in the specific flow table of the switch"; 
        input {
            uses inv:node-context-ref;
            leaf table-id {
            	type flow-types:table-id;
            }
        }
        output {
	        uses stat-types:aggregate-flow-statistics;
            uses tr:transaction-aware;
        }
    }
    rpc get-aggregate-flow-statistics-from-flow-table-for-given-match {
    	description "Fetch aggregate statistics for all the flow matches to the given match from the given table of the switch"; 
        input {
            uses inv:node-context-ref;
            uses flow-types:flow;
        }
        output {
	        uses stat-types:aggregate-flow-statistics;
            uses tr:transaction-aware;
        }
    }

    notification aggregate-flow-statistics-update {
    	description "Aggregate flow statistics for a table, sent by switch";
		leaf moreReplies {
            type boolean;
        }
        uses inv:node;
		uses stat-types:aggregate-flow-statistics;
		uses tr:transaction-aware;
    }
	
	//Keeping flow statistics RPC call for backward compatibility for sal-compatibility layer --START
	rpc get-flow-statistics {
        input {
            uses inv:node-context-ref;
            uses flow-types:flow;
        }
        output {
            uses flow-types:flow-statistics;
        }
    }

    rpc get-all-flow-statistics {
        input {
            uses inv:node-context-ref;
        }
        output {
            list flow-statistics {
                uses flow-types:flow-statistics;
            }
        }
    }

    notification flow-statistics-updated {
        uses flow-types:flow-statistics;
    }
	
	//Keeping flow statistics RPC call for backward compatibility for sal-compatibility layer --END
	
	//RPC call to fetch node connector statistics
    rpc get-node-connector-statistics {
        input {
            uses inv:node-context-ref;
            leaf node-connector {
                type inv:node-connector-ref;
            }
        }
        output {
            uses stat-types:node-connector-statistics;
        }
    }

    rpc get-all-node-connector-statistics {
        input {
            uses inv:node-context-ref;
        }
        output {
            list node-connector-statistics {
                uses stat-types:node-connector-statistics;
            }
        }
    }

    rpc get-flow-table-statistics {
        input {
            uses inv:node-context-ref;
        }
        output {
            uses flow-types:flow-table-statistics;
        }
    }

    notification flow-table-statistics-updated {
        leaf flow-table {
            type flow:flow-table-ref;
        }
        uses flow-types:flow-table-statistics;
    }

    notification node-connector-statistics-updated {
        uses stat-types:node-connector-statistics;
    }
}