public void readInterventions() {
InterventionMap newMap = new InterventionMap();
List<Criterion> c = new ArrayList<Criterion>();
c.add(Restrictions.isNull("endTime"));
for (Intervention intervention :
database.getList(Intervention.class, null, null, null, c, null)) {
newMap.put(intervention.getDevice(), intervention);
}
if (!interventions.equals(newMap)) {
interventions = newMap;
if (eventBus != null) {
log.info("Read Interventions from DB");
InterventionMapChangedRemoteEvent.fire(this, eventBus, interventions);
}
}
}
private boolean checkUpdateAndConnection() throws HibernateException {
long now = new Date().getTime();
try {
Date lastUpdate = database.getLastMeasurementUpdateTime();
if (lastUpdate != null) {
long time = lastUpdate.getTime();
updated = (time > now - delay) ? Ternary.True : Ternary.False;
updatedCause = "Last Update: " + new Date(time);
} else {
updated = Ternary.False;
updatedCause = "Never Updated";
}
connected = Ternary.True;
connectedCause = "";
} catch (HibernateException e) {
connected = Ternary.False;
connectedCause = e.getMessage();
throw e;
} finally {
if (eventBus != null) {
if (!updated.equals(wasUpdated)) {
ConnectionStatusChangedRemoteEvent.fire(
eventBus, ConnectionType.databaseUpdate, updated, updatedCause);
}
if (!connected.equals(wasConnected)) {
ConnectionStatusChangedRemoteEvent.fire(
eventBus, ConnectionType.databaseConnect, connected, connectedCause);
}
}
}
return !updated.isFalse();
}
private DatabaseHandler(final RemoteEventBus eventBus) {
this.eventBus = eventBus;
delay =
ServerStorage.getLocalStorageIfSupported()
.getInt("APVS.database.updateDelay", DEFAULT_MAX_UPDATE_DELAY)
* SECONDS;
log.info("Using update delay: " + delay + " ms");
database = Database.getInstance();
RequestRemoteEvent.register(
this,
eventBus,
new RequestRemoteEvent.Handler() {
@Override
public void onRequestEvent(RequestRemoteEvent event) {
String type = event.getRequestedClassName();
if (type.equals(InterventionMapChangedRemoteEvent.class.getName())) {
log.info("Request to DB " + event);
InterventionMapChangedRemoteEvent.fire(this, eventBus, interventions);
} else if (type.equals(ConnectionStatusChangedRemoteEvent.class.getName())) {
ConnectionStatusChangedRemoteEvent.fire(
eventBus, ConnectionType.databaseConnect, connected, connectedCause);
ConnectionStatusChangedRemoteEvent.fire(
eventBus, ConnectionType.databaseUpdate, updated, updatedCause);
}
}
});
try {
checkUpdateAndConnection();
readInterventions();
} catch (HibernateException e1) {
log.warn("Problem", e1);
}
ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
executor.scheduleWithFixedDelay(
new Runnable() {
// ScheduledFuture<?> watchdog;
@Override
public void run() {
try {
if (!checkUpdateAndConnection()) {
log.warn("DB " + updatedCause);
} else if (!isConnected()) {
log.warn("DB " + connectedCause);
}
} catch (HibernateException e) {
log.warn("Could not update or reach DB: ", e);
}
}
},
0,
30,
TimeUnit.SECONDS);
}