/**
* Constructs an instance of the sample client wrapper
*
* @param brokerUrl the url to connect to
* @param clientId the client id to connect with
* @param cleanSession clear state at end of connection or not (durable or non-durable
* subscriptions)
* @param quietMode whether debug should be printed to standard out
* @param userName the username to connect with
* @param password the password for the user
* @throws MqttException
*/
public SampleAsyncWait(
String brokerUrl,
String clientId,
boolean cleanSession,
boolean quietMode,
String userName,
String password)
throws MqttException {
this.brokerUrl = brokerUrl;
this.quietMode = quietMode;
this.clean = cleanSession;
this.userName = userName;
this.password = password;
// This sample stores in a temporary directory... where messages temporarily
// stored until the message has been delivered to the server.
// ..a real application ought to store them somewhere
// where they are not likely to get deleted or tampered with
String tmpDir = System.getProperty("java.io.tmpdir");
MqttDefaultFilePersistence dataStore = new MqttDefaultFilePersistence(tmpDir);
try {
// Construct the connection options object that contains connection parameters
// such as cleanSession and LWT
conOpt = new MqttConnectOptions();
conOpt.setCleanSession(clean);
if (password != null) {
conOpt.setPassword(this.password.toCharArray());
}
if (userName != null) {
conOpt.setUserName(this.userName);
}
// Construct a non-blocking MQTT client instance
client = new MqttAsyncClient(this.brokerUrl, clientId, dataStore);
// Set this wrapper as the callback handler
client.setCallback(this);
} catch (MqttException e) {
e.printStackTrace();
log("Unable to set up client: " + e.toString());
System.exit(1);
}
}
public static void main(String[] args) {
clearConsolidation();
try {
final MqttAsyncClient mqttClient =
new MqttAsyncClient(BROKER_URI, MqttClient.generateClientId(), new MemoryPersistence());
mqttClient.setCallback(
new MqttCallback() {
@Override
public void messageArrived(String topic, MqttMessage message) throws Exception {
try {
// TODO retrieve sensor value and sensor name
double sensorValue = 0;
// sensorValue = ...
String sensorName = null;
// sensorName = ...
ConsolidatedValues conso = consolidation.get(sensorName);
if (conso == null) {
conso = new ConsolidatedValues();
consolidation.put(sensorName, conso);
}
conso.addSample(sensorValue);
// end of the minute?
if (System.currentTimeMillis() > nextMinuteTimestamp) {
System.out.println("PUBLISH CONSOLIDATION");
// TODO publish computed average value
clearConsolidation();
}
} catch (RuntimeException e) {
e.printStackTrace();
}
}
@Override
public void deliveryComplete(IMqttDeliveryToken token) {
// not used
}
@Override
public void connectionLost(Throwable cause) {
System.out.println("Connection lost: " + cause.getLocalizedMessage());
}
});
mqttClient.connect(
null,
new IMqttActionListener() {
@Override
public void onSuccess(IMqttToken asyncActionToken) {
// TODO subscribe to live data
}
@Override
public void onFailure(IMqttToken asyncActionToken, Throwable exception) {
exception.printStackTrace();
}
});
} catch (MqttException e) {
e.printStackTrace();
}
}