/* (non-Javadoc)
* @see org.openiot.gsn.vsensor.AbstractVirtualSensor#dataAvailable(java.lang.String, org.openiot.gsn.beans.StreamElement)
*/
@Override
public void dataAvailable(String inputStreamName, StreamElement streamElement) {
if (streamElement.getFieldTypes().length == nbArgs + 1)
for (int i = 0; i < nbArgs; i++) parameters[i] = (Double) streamElement.getData()[i];
Double answer;
try {
String matlabCommand = functionName + "(";
for (int i = 0; i < nbArgs; i++) {
matlabCommand = matlabCommand + parameters[i].toString();
if (i != nbArgs - 1) matlabCommand = matlabCommand + ",";
}
if (nbArgs > 0) matlabCommand = matlabCommand + ")";
if (logger.isDebugEnabled())
logger.debug("Calling matlab engine with command: " + matlabCommand);
engine.evalString(matlabCommand);
String matlabAnswer = engine.getOutputString(100);
if (logger.isDebugEnabled())
logger.debug(
"Received output from matlab: "
+ matlabAnswer
+ ". Trying to interpret this"
+ " answer as a Java Float object.");
answer = Double.parseDouble(matlabAnswer);
StreamElement result = new StreamElement(fieldNames, fieldTypes, new Serializable[] {answer});
dataProduced(result);
} catch (IOException e) {
logger.warn(e);
}
}
public void consume(StreamElement se, VSensorConfig config) {
synchronized (listeners) {
for (DistributionRequest listener : listeners)
if (listener.getVSensorConfig() == config) {
logger.debug(
"sending stream element "
+ (se == null ? "second-chance-se" : se.toString())
+ " produced by "
+ config.getName()
+ " to listener =>"
+ listener.toString());
if (!candidateListeners.containsKey(listener)) {
addListenerToCandidates(listener);
} else {
candidatesForNextRound.put(listener, Boolean.TRUE);
}
}
}
}
private void exportValues(StreamElement streamElement) {
if (logger.isDebugEnabled())
logger.debug("Trying to add new data items to the rrdfile:" + this.rrdfile);
String command = "rrdtool update " + rrdfile + " N";
Serializable[] stream = streamElement.getData();
String field;
for (int i = 0; i < stream.length; i++) {
field = stream[i].toString();
// if the field is empty we have to add an U for unknown to the rrdfile
if (field == null || field.equals("")) field = "U";
command = command + ":" + field;
}
Runtime runtime = Runtime.getRuntime();
try {
if (logger.isDebugEnabled()) logger.debug("The used rrdtool update command is: " + command);
Process process = runtime.exec(command);
if (logger.isDebugEnabled()) logger.debug("The processing did not generate an error!");
} catch (IOException e) {
logger.debug("An IOException has occured: " + e);
}
}