A Stream Processing System for Multisource Heterogeneous Sensor Data

Box 1

XML file representing a virtual sensor.

<virtual-sensor name="smesh sht11" priority="10">

 <processing-class>

  <class-name>gsn.vsensor.BridgeVirtualSensor</class-name>

  <init-params />

  <output-structure>

   <field name="nodeid" type="double"/>

   <field name="parent" type="double"/>

   <field name="seqid" type="double"/>

   <field name="groupid" type="double"/>

   <field name="board_id" type="double"/>

   <field name="light" type="double"/>

   <field name="temp" type="double"/>

   <field name="voltage" type="double"/>

  </output-structure>

 </processing-class>

 <description>This sensor gets xml data from smesh server

 </description>

 <life-cycle pool-size="10" />

 <addressing>

  <predicate key="geographical">Sensor 114 @ EPFL</predicate>

  <predicate key="LATITUDE">46.520000</predicate>

  <predicate key="LONGITUDE">6.565000</predicate>

 </addressing>

 <storage history-size="5m" />

 <streams>

  <stream name="input1">

   <source alias="source1" sampling-rate="1" storage-size="1">

    <address wrapper="sht11">

     <predicate key="rate">500</predicate>

     <predicate key="host">192.168.1.135</predicate>

     <predicate key="port">9005</predicate>

    </address>

    <query>SELECT nodeid,parent,seqid,groupid,board_id,light,temp,voltage

       FROM wrapper</query>

   </source>

   <query>SELECT nodeid,parent,seqid,groupid,board_id,light,temp,voltage

      FROM source1</query> 

  </stream>

 </streams>

</virtual-sensor>