/** PV is connected. Get meta info, or subscribe right away. */
private void handleConnected(final Channel channel) {
try {
if (channel.getConnectionState() != Channel.CONNECTED) {
return;
}
} catch (Exception ex) {
logger.warn("Exception handling connection state change for " + this.name, ex);
return;
}
if (state == PVConnectionState.Connected) return;
state = PVConnectionState.Connected;
hostName = channel_ref.getChannel().getHostName();
totalMetaInfo.setHostName(hostName);
for (final PVListener listener : listeners) {
listener.pvConnected(this);
}
// If we're "running", we need to get the meta data and
// then subscribe.
// Otherwise, we're done.
if (!running) {
connected = true;
// meta = null;
synchronized (this) {
this.notifyAll();
}
return;
}
// else: running, get meta data, then subscribe
try {
DBRType type = channel.getFieldType();
if (!(plain || type.isSTRING())) {
state = PVConnectionState.GettingMetadata;
if (type.isDOUBLE() || type.isFLOAT()) type = DBRType.CTRL_DOUBLE;
else if (type.isENUM()) type = DBRType.LABELS_ENUM;
else if (type.isINT()) type = DBRType.CTRL_INT;
else type = DBRType.CTRL_SHORT;
channel.get(type, 1, meta_get_listener);
return;
}
} catch (final Exception ex) {
logger.error("exception when handleConnect " + name, ex);
return;
}
// Meta info is not requested, not available for this type,
// or there was an error in the get call.
// So reset it, then just move on to the subscription.
// meta = null;
subscribe();
}
public JCAConnectionPayload(
JCAChannelHandler channleHandler, Channel channel, JCAConnectionPayload previousPayload) {
this.jcaDataSource = channleHandler.getJcaDataSource();
this.channel = channel;
this.connected =
channel != null && channel.getConnectionState() == Channel.ConnectionState.CONNECTED;
this.longString = channleHandler.isLongString();
if (channel.getFieldType().getClass() == null && previousPayload != null) {
// JNI sets the type to unknown on disconnect. We need
// to remember the type before the disconnection
this.fieldType = previousPayload.fieldType;
} else {
this.fieldType = channel.getFieldType();
}
}
/** Subscribe for value updates. */
private void subscribe() {
synchronized (this) {
// Prevent multiple subscriptions.
if (subscription != null) {
return;
}
// Late callback, channel already closed?
final RefCountedChannel ch_ref = channel_ref;
if (ch_ref == null) {
return;
}
final Channel channel = ch_ref.getChannel();
// final Logger logger = Activator.getLogger();
try {
if (channel.getConnectionState() != Channel.CONNECTED) {
return;
}
//
// the RefCountedChannel should maintain a single
// subscription to the underlying CAJ/JCA channel.
// So even with N PVs for the same channel, it's
// only one subscription on the network instead of
// N subscriptions.
final DBRType type = DBR_Helper.getTimeType(plain, channel.getFieldType());
state = PVConnectionState.Subscribing;
totalMetaInfo.setStartTime(System.currentTimeMillis());
// isnotTimestampDBR
if (this.name.endsWith(".RTYP")) {
subscription = channel.addMonitor(MonitorMask.ARCHIVE.getMask(), this);
} else {
subscription =
channel.addMonitor(
type, channel.getElementCount(), MonitorMask.ARCHIVE.getMask(), this);
}
} catch (final Exception ex) {
logger.error("exception when subscribing pv " + name, ex);
}
}
}