/**
* set a node attribute
*
* @param objectID unique ID of the JEVisObject on the Server.
* @param attributeName unique name of the Attribute under this Object
* @param value and its value
*/
public static void writeToJEVis(long objectID, String attributeName, Object value) {
try {
// Check if the connection is still alive. An JEVisException will be
// thrown if you use one of the functions and the connection is lost
if (jevis.isConnectionAlive()) {
// Get the JEVisObject with the given ID. You can get the uniqe
// ID with the help of JEConfig.
if (jevis.getObject(objectID) != null) {
JEVisObject myObject = jevis.getObject(objectID);
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.INFO, "JEVisObject: " + myObject);
// Get the JEVisAttribute by its unique identifier.
if (myObject.getAttribute(attributeName) != null) {
JEVisAttribute attribute = myObject.getAttribute(attributeName);
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.INFO, "JEVisAttribute: " + attribute);
DateTime timestamp = DateTime.now();
// Now we let the Attribute creates an JEVisSample,an JEVisSample allways need an
// Timestamp and an value.
JEVisSample newSample =
attribute.buildSample(timestamp, value, "This is an note, imported via SysReader");
// Until now we created the sample only localy and we have to commit it to the JEVis
// Server.
newSample.commit();
// TODO: we need an example for attribute.addSamples(listOfSamples); function. This
// function allows to commit a bunch of sample at once
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "Could not found the Attribute with the name:" + attributeName);
}
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "Could not found the Object with the id:" + objectID);
}
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "Connection to the JEVisServer is not alive");
// TODO: the programm could now retry to connect,
// We dont have to do the isConnectionAlive() but use the JEVisException to handle this
// problem.
}
} catch (JEVisException ex) {
Logger.getLogger(WiotechStructureCreator.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* Create an new JEVisObject on the JEVis Server.
*
* @param parentObjectID unique ID of the parent object where the new object will be created under
* @param newObjectClass The JEVisClass of the new JEVisObject
* @param newObjectName The name of the new JEVisObject
*/
private static JEVisObject createObject(
long parentObjectID, String newObjectClass, String newObjectName) {
JEVisObject newObject = null;
try {
// Check if the connection is still alive. An JEVisException will be
// thrown if you use one of the functions and the connection is lost
if (jevis.isConnectionAlive()) {
// Get the ParentObject from the JEVis system
if (jevis.getObject(parentObjectID) != null) {
JEVisObject parentObject = jevis.getObject(parentObjectID);
JEVisClass parentClass = parentObject.getJEVisClass();
// Get the JEVisClass we want our new JEVisObject to have
if (jevis.getJEVisClass(newObjectClass) != null) {
JEVisClass newClass = jevis.getJEVisClass(newObjectClass);
// Check if the JEVisObject with this class is allowed under a parent of the other Class
// it will also check if the JEVisClass is unique and if another object of the Class
// exist.
if (newClass.isAllowedUnder(parentClass)) {
newObject = parentObject.buildObject(newObjectName, newClass);
newObject.commit();
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.INFO, "New ID: " + newObject.getID());
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(
Level.SEVERE,
"Cannot create Object because the parent JEVisClass does not allow the child");
}
}
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "Cannot create Object because the parent is not accessible");
}
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "Connection to the JEVisServer is not alive");
}
} catch (JEVisException ex) {
Logger.getLogger(WiotechStructureCreator.class.getName()).log(Level.SEVERE, null, ex);
}
return newObject;
}
/**
* Connect to JEVis
*
* @param sqlServer Address of the MySQL Server
* @param port Port of the MySQL Server, Default is 3306
* @param sqlSchema Database schema of the JEVis database
* @param sqlUser MySQl user for the connection
* @param sqlPW MySQL password for the connection
* @param jevisUser Username of the JEVis user
* @param jevisPW Password of the JEVis user
*/
public void connectToJEVis(
String sqlServer,
String port,
String sqlSchema,
String sqlUser,
String sqlPW,
String jevisUser,
String jevisPW) {
try {
// Create an new JEVisDataSource from the MySQL implementation
// JEAPI-SQl. This connection needs an vaild user on the MySQl Server.
// Later it will also be possible to use the JEAPI-WS and by this
// using the JEVis webservice (REST) as an endpoint which is much
// saver than using a public SQL-port.
jevis = new JEVisDataSourceSQL(sqlServer, port, sqlSchema, sqlUser, sqlPW);
// authentificate the JEVis user.
if (jevis.connect(jevisUser, jevisPW)) {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.INFO, "Connection was successful");
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.INFO, "Connection was not successful, exiting app");
System.exit(1);
}
} catch (JEVisException ex) {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "There was an error while connecting to the JEVis Server");
Logger.getLogger(WiotechStructureCreator.class.getName()).log(Level.SEVERE, null, ex);
System.exit(1);
}
}
private static ObjectAndBoolean createObjectCheckNameExistance(
long parentObjectID, String newObjectClass, String newObjectName) {
try {
// Check if the connection is still alive. An JEVisException will be
// thrown if you use one of the functions and the connection is lost
if (jevis.isConnectionAlive()) {
// Get the ParentObject from the JEVis system
if (jevis.getObject(parentObjectID) != null) {
JEVisObject parentObject = jevis.getObject(parentObjectID);
List<JEVisObject> children = parentObject.getChildren();
for (JEVisObject child : children) {
try {
String mac = child.getAttribute("MAC").getLatestSample().getValueAsString();
if (mac.equals(newObjectName)) {
return new ObjectAndBoolean(child, false);
}
} catch (NullPointerException ex) {
if (child.getName().equals(newObjectName)) {
return new ObjectAndBoolean(child, false);
}
}
}
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "Cannot create Object because the parent is not accessible");
}
} else {
Logger.getLogger(WiotechStructureCreator.class.getName())
.log(Level.SEVERE, "Connection to the JEVisServer is not alive");
}
} catch (JEVisException ex) {
Logger.getLogger(WiotechStructureCreator.class.getName()).log(Level.SEVERE, null, ex);
}
return new ObjectAndBoolean(createObject(parentObjectID, newObjectClass, newObjectName), true);
}
