/**
* Read the initial alarm configuration
*
* @throws Exception on error
*/
private void readConfiguration() throws Exception {
// Read alarm hierarchy
final BenchmarkTimer timer = new BenchmarkTimer();
final int pv_count;
synchronized (this) {
alarm_tree = rdb.readConfiguration();
// Determine PVs
final ArrayList<AlarmPV> tmp_pv_array = new ArrayList<AlarmPV>();
findPVs(alarm_tree, tmp_pv_array);
// Turn into plain array
pv_list = tmp_pv_array.toArray(new AlarmPV[tmp_pv_array.size()]);
tmp_pv_array.clear();
// Sort PVs by name
Arrays.sort(
pv_list,
new Comparator<AlarmPV>() {
@Override
public int compare(final AlarmPV pv1, final AlarmPV pv2) {
return pv1.getName().compareTo(pv2.getName());
}
});
// Create hash
pv_map = new HashMap<String, AlarmPV>();
for (AlarmPV pv : pv_list) pv_map.put(pv.getName(), pv);
pv_count = pv_list.length;
}
timer.stop();
// LDAP results: Read 12614 PVs in 2.69 seconds, 4689.0 PVs/sec
System.out.format(
"Read %d PVs in %.2f seconds: %.1f PVs/sec\n",
pv_count, timer.getSeconds(), pv_count / timer.getSeconds());
}
/** Stop PVs */
private void stopPVs() {
// See deadlock comment in start()
final AlarmPV pvs[];
synchronized (this) {
pvs = pv_list.clone();
}
for (AlarmPV pv : pvs) pv.stop();
}
/**
* Set maintenance mode.
*
* @param maintenance_mode
* @see AlarmLogic#getMaintenanceMode()
*/
public void setMaintenanceMode(final boolean maintenance_mode) {
// Any change?
if (maintenance_mode == AlarmLogic.getMaintenanceMode()) return;
// Configure alarm logic
AlarmLogic.setMaintenanceMode(maintenance_mode);
// Send update to clients
messenger.sendIdleMessage();
// Entering maintenance mode: Ack' all INVALID alarms
if (maintenance_mode) {
synchronized (this) {
for (AlarmPV pv : pv_list) {
final AlarmLogic logic = pv.getAlarmLogic();
if (logic.getAlarmState().getSeverity() == SeverityLevel.INVALID) logic.acknowledge(true);
}
}
}
}
/**
* Read updated configuration for PV from RDB
*
* @param path_name PV name or <code>null</code> to reload complete configuration
*/
void updateConfig(final String path_name) throws Exception {
resetNagTimer();
AlarmPV pv = null;
if (path_name != null) {
final String[] path = AlarmTreePath.splitPath(path_name);
// Is this a PV under a different alarm tree root?
if (!root_name.equals(path[0])) return;
// Locate PV, assuming last path element is PV
pv = findPV(path[path.length - 1]);
}
if (pv == null) { // Unknown PV, so this must be a new PV. Read whole config again
stopPVs();
readConfiguration();
startPVs();
return;
}
// Known PV
pv.stop();
rdb.readConfigurationUpdate(pv);
pv.start();
}
/** Start PVs */
private void startPVs() {
final long delay = Preferences.getPVStartDelay();
// Must not sync while calling PV, because Channel Access updates
// might arrive while we're trying to start/stop channels,
// and those updates will try to lock the Alarm Server,
// which then results in a deadlock:
// a) We lock AlarmServer, then try to call CA,
// which takes internal JNI locks
// b) CA takes internal locks, calls PV update callback, which
// then tries to lock the AlarmServer when locating the PV by name
final AlarmPV pvs[];
synchronized (this) {
pvs = pv_list.clone();
}
for (AlarmPV pv : pvs) {
try {
pv.start();
if (delay > 0) Thread.sleep(delay);
} catch (Exception ex) {
Activator.getLogger().log(Level.SEVERE, "Error starting PV " + pv.getName(), ex);
}
}
}
/**
* (Un-)acknowledge alarm.
*
* @param pv_name PV to acknowledge
* @param acknowledge Acknowledge, or un-acknowledge?
*/
public void acknowledge(final String pv_name, final boolean acknowledge) {
resetNagTimer();
final AlarmPV pv = findPV(pv_name);
if (pv != null) pv.getAlarmLogic().acknowledge(acknowledge);
}
