/** {@inheritDoc} */
@SuppressWarnings("nls")
@Override
public void pvChanged(final PVReaderEvent<List<VType>> event) {
final PVReader<List<VType>> pv = event.getPvReader();
// Check for error
final Exception error = pv.lastException();
if (error != null)
Activator.getLogger().log(Level.FINE, "PV " + pv.getName() + " error", error);
final List<VType> values = pv.getValue();
if (values == null) { // No current value
current_value = null;
// In 'monitor' mode, mark in live sample buffer
if (period <= 0) logDisconnected();
return;
} else {
boolean added = false;
for (VType value : values) {
// Cache most recent for 'scanned' operation
current_value = value;
// In 'monitor' mode, add to live sample buffer
if (period <= 0) {
Activator.getLogger()
.log(Level.FINE, "PV {0} received {1}", new Object[] {getName(), value});
samples.addLiveSample(value);
added = true;
}
}
if (automaticRefresh
&& added
&& samples.isHistoryRefreshNeeded(model.getStartTime(), model.getEndTime())) {
model.fireItemRefreshRequested(this);
}
}
}
/** Add one(!) 'disconnected' sample */
private void logDisconnected() {
synchronized (samples) {
final int size = samples.getSize();
if (size > 0) {
final String last = VTypeHelper.getMessage(samples.getSample(size - 1).getValue());
// Does last sample already have 'disconnected' status?
if (Messages.Model_Disconnected.equals(last)) return;
}
samples.addLiveSample(new PlotSample(Messages.LiveData, Messages.Model_Disconnected));
}
}
/** @param value Value to log with 'now' as time stamp */
private void logValueAsNow(final VType value) {
if (value == null) logDisconnected();
else
// Transform value to have 'now' as time stamp
samples.addLiveSample(VTypeHelper.transformTimestampToNow(value));
}
