2.6. JSON Tags¶
The StatisticsBackend uses JSON format to retrieve information in many methods as get_info(),
get_graph() or dump_database().
2.6.1. Dump Tags Example¶
The following snippet shows an example of a database dump, result of calling dump_database() in a database
with one entity of each EntityKind, and one data of each DataKind:
{
"description": "DB dump with 1 entity of each EntityKind and 1 data of each DataKind",
"version": "0.0",
"hosts":
{
"1":
{
"name": "host_0",
"users": ["2"]
}
},
"users":
{
"2":
{
"name": "user_0",
"host": "1",
"processes": ["3"]
}
},
"processes":
{
"3":
{
"name": "process_0",
"pid": "36000",
"user": "2",
"participants": ["6"]
}
},
"domains":
{
"4":
{
"name": "domain_0",
"participants": ["6"],
"topics": ["5"]
}
},
"topics":
{
"5":
{
"name": "topic_0",
"data_type": "data_type",
"domain": "4",
"datawriters": ["7"],
"datareaders": ["8"]
}
},
"participants":
{
"6":
{
"name": "participant_0",
"guid": "01.0f.00.00.00.00.00.00.00.00.00.00|00.00.00.00",
"qos": {"qos": "empty"},
"process": "3",
"domain": "4",
"datawriters": ["7"],
"datareaders": ["8"],
"data":
{
"discovery_time":
{
"6":
[
{
"src_time": "1",
"time": "0",
"remote_id": "6",
"discovered": true
}
]
},
"pdp_packets":
[
{
"src_time": "0",
"count": 2
}
],
"edp_packets":
[
{
"src_time": "0",
"count": 2
}
],
"rtps_packets_sent":
{
"0":
[
{
"src_time": "0",
"count": 2
}
]
},
"rtps_bytes_sent":
{
"0":
[
{
"src_time": "0",
"magnitude": 0,
"count": 2
}
]
},
"rtps_packets_lost":
{
"0":
[
{
"src_time": "0",
"count": 2
}
]
},
"rtps_bytes_lost":
{
"0":
[
{
"src_time": "0",
"magnitude": 0,
"count": 2
}
]
},
"last_reported_edp_packets":{
"count":2,
"src_time":"0"
},
"last_reported_pdp_packets":{
"count":2,
"src_time":"0"
},
"last_reported_rtps_bytes_lost":{
"0":{
"count":2,
"magnitude":0,
"src_time":"0"
}
},
"last_reported_rtps_bytes_sent":{
"0":{
"count":2,
"magnitude":0,
"src_time":"0"
}
},
"last_reported_rtps_packets_lost":{
"0":{
"count":2,
"src_time":"0"
}
},
"last_reported_rtps_packets_sent":{
"0":{
"count":2,
"src_time":"0"
}
}
}
}
},
"datawriters":
{
"7":
{
"name": "datawriter_0",
"guid": "01.0f.00.00.00.00.00.00.00.00.00.00|00.00.00.00",
"qos": {"qos": "empty"},
"participant": "6",
"topic": "5",
"locators": ["0"],
"data":
{
"publication_throughput":
[
{
"src_time": "0",
"data": 1.1
}
],
"resent_datas":
[
{
"src_time": "0",
"count": 2
}
],
"heartbeat_count":
[
{
"src_time": "0",
"count": 2
}
],
"gap_count":
[
{
"src_time": "0",
"count": 2
}
],
"data_count":
[
{
"src_time": "0",
"count": 2
}
],
"samples_datas":
{
"3":
[
{
"src_time": "0",
"count": 2
}
]
},
"history2history_latency":
{
"8":
[
{
"src_time": "0",
"data": 1.1
}
]
},
"last_reported_data_count":{
"count":2,
"src_time":"0"
},
"last_reported_gap_count":{
"count":2,
"src_time":"0"
},
"last_reported_heartbeat_count":{
"count":2,
"src_time":"0"
},
"last_reported_resent_datas":{
"count":2,
"src_time":"0"
}
}
}
},
"datareaders":
{
"8":
{
"name": "datareader_0",
"guid": "01.0f.00.00.00.00.00.00.00.00.00.00|00.00.00.00",
"qos": {"qos": "empty"},
"participant": "6",
"topic": "5",
"locators": ["0"],
"data":
{
"subscription_throughput":
[
{
"src_time": "0",
"data": 1.1
}
],
"acknack_count":
[
{
"src_time": "0",
"count": 2
}
],
"nackfrag_count":
[
{
"src_time": "0",
"count": 2
}
],
"last_reported_acknack_count":{
"count":2,
"src_time":"0"
},
"last_reported_nackfrag_count":{
"count":2,
"src_time":"0"
}
}
}
},
"locators":
{
"0":
{
"name": "locator_0",
"datawriters": ["7"],
"datareaders": ["8"],
"data":
{
"network_latency_per_locator":
{
"0":
[
{
"src_time": "0",
"data": 1.1
}
]
}
}
}
}
}