IS4: Storage System for Physical Data Jorge Ortiz System Architecture Semantic graphs Physical data management  What is physical data  Produced by sensors in physical environment  Sensor devices change over time  Physical environment changes over time HTTP/RESTful interface Future Work  Pub/Sub System  Metadata schema  Object description  Logic description  Context graphs  Context graph capture entity relationships  Nodes/edges represent logical or physical relationships  Nodes/edges associated with devices  Devices produce time series data  Query interface  Semantic + time series queries  Semantic graph constraints  Time series data processing  Interpolation, extrapolation, signal processing Picture 1: Sensors embedded in Load Tree Electrical Humidity PAR/TSR Temperature Circuit/breaker panel level power monitoring Vibration Load Tree CT mains power monitoring ACme: plug load energy monitor and controller 2001:252:0:1::2008:6 and 2001:252:0:1::2008:8 Make: ACme Model: Revision 1 Storage HTTP/REST Publish Manager Subscribe Manager Proxy Manage r Humidity PAR/TSR Temperature Vibration CT mains power monitoring ACme: plug load energy monitor and controller Publish Subscribe Context Manager / #root – status information [GET] /is4 # a particular channel [GET] /info # statistical system information [GET] /publish # publishing resource [GET/PUT] /all # list of all publishers [GET] /id # sub-children [GET] / # id of publisher [GET/POST] /name # name alias for this id [GET] /mysubs# l ist/add to pub subscriptions [GET/PUT/DELETE] /metadata# returns publisher-associate metadata [GET] POST requests: supply JSON objects as arguments: POST: { “SubscribeTo":[ ,234213, ], “UnsubscribeFrom":[45432,567365, , ] } Publisher Id Username and pw hash { "description":“logic_stream_schema", "type":"object", "properties": { “type":{"type":"string","optional":false, "options":[{"value":“logic"}]}, “$schema”:”logic_stream_schema.json”, “address”:{“type”:”string”, “format”:[“string”, “ipv4”, “ipv6”, “url”], “optional”:”false”}, “functions”:{“type”:”array”, “options”:[{ “function_name”:”{“type”:”string”}, “operation”:{“type”:”string”, “optional”:”true”}, “parameters”:{“type”:”array”, “options”:[”object”, “string”, “$ref”]} } { "description":“logic_stream_schema", "type":"object", "properties": { “type":{"type":"string","optional":false, "options":[{"value":“logic"}]}, “$schema”:”logic_stream_schema.json”, “address”:{“type”:”string”, “format”:[“string”, “ipv4”, “ipv6”, “url”], “optional”:”false”}, “functions”:{“type”:”array”, “options”:[{ “function_name”:”{“type”:”string”}, “operation”:{“type”:”string”, “optional”:”true”}, “parameters”:{“type”:”array”, “options”:[”object”, “string”, “$ref”]} } Logic schema { "description":"object_stream_schema", "type":"object", "properties": { “type":{"type":"string","optional":false, "options":[{"value":"object_stream"}]}, "device_name":{"type":"string", "optional":"false"}, "model":{"type":"string","optional":false}, "desc":{"type":"string","optional":true}, “url":{"type":"string",”format”:”url”,"optional":true } { "description":"object_stream_schema", "type":"object", "properties": { “type":{"type":"string","optional":false, "options":[{"value":"object_stream"}]}, "device_name":{"type":"string", "optional":"false"}, "model":{"type":"string","optional":false}, "desc":{"type":"string","optional":true}, “url":{"type":"string",”format”:”url”,"optional":true } Object schema Context graph schema Context Node: { "label":{"type":"string", "optional":false}, "name":{"type":"string", "optional":false}, "type":{"type":"string","options":[{"value":"context_node"}], "optional":false}, "description":{"type":"string", "optional":false}, "properties": { "AssociatedDevices":{ "type":"array", "options":[{"value":"string","format":"UUID"}], "optional":true }, "parents":{ "type":"array", "options":[{"value":"string", "properties":{"$ref":"#.properties.cnid"}}], "optional":true }, "children":{ "type":"array", "options":[{"value":"string", "properties":{"$ref":"#.properties.cnid"}}], "optional":true }, "cnid": { "type":[“string"] "description":"local node identifier", "optional":false }}} Context Edge {… "label":{"type":"string", "optional":false, "description":"String with spaces"}, "name":{"type":"string", "optional":false, "description":"String without space"}, … "sourceNode":{"type":[“string"], "description":"local node identifier", "optional":false}, "destinationNode":{"type":[“string"], "description":"local node identifier", "optional":false}, "AssociatedDevices":{ "type":"array", "options":[{"value":"string","format":"UUID"}], "optional":true }} Context Node: { "label":{"type":"string", "optional":false}, "name":{"type":"string", "optional":false}, "type":{"type":"string","options":[{"value":"context_node"}], "optional":false}, "description":{"type":"string", "optional":false}, "properties": { "AssociatedDevices":{ "type":"array", "options":[{"value":"string","format":"UUID"}], "optional":true }, "parents":{ "type":"array", "options":[{"value":"string", "properties":{"$ref":"#.properties.cnid"}}], "optional":true }, "children":{ "type":"array", "options":[{"value":"string", "properties":{"$ref":"#.properties.cnid"}}], "optional":true }, "cnid": { "type":[“string"] "description":"local node identifier", "optional":false }}} Context Edge {… "label":{"type":"string", "optional":false, "description":"String with spaces"}, "name":{"type":"string", "optional":false, "description":"String without space"}, … "sourceNode":{"type":[“string"], "description":"local node identifier", "optional":false}, "destinationNode":{"type":[“string"], "description":"local node identifier", "optional":false}, "AssociatedDevices":{ "type":"array", "options":[{"value":"string","format":"UUID"}], "optional":true }}  Graph representation  Graph time snapshots