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OpcUaSubscriptionManager.java
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OpcUaSubscriptionManager.java
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/*
* Copyright (c) 2021 the Eclipse Milo Authors
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.milo.opcua.sdk.client.subscriptions;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.BiFunction;
import java.util.function.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import org.eclipse.milo.opcua.sdk.client.OpcUaClient;
import org.eclipse.milo.opcua.sdk.client.SessionActivityListener;
import org.eclipse.milo.opcua.sdk.client.api.UaSession;
import org.eclipse.milo.opcua.sdk.client.api.subscriptions.UaMonitoredItem;
import org.eclipse.milo.opcua.sdk.client.api.subscriptions.UaSubscription;
import org.eclipse.milo.opcua.sdk.client.api.subscriptions.UaSubscriptionManager;
import org.eclipse.milo.opcua.stack.core.StatusCodes;
import org.eclipse.milo.opcua.stack.core.UaException;
import org.eclipse.milo.opcua.stack.core.types.builtin.DataValue;
import org.eclipse.milo.opcua.stack.core.types.builtin.DateTime;
import org.eclipse.milo.opcua.stack.core.types.builtin.ExtensionObject;
import org.eclipse.milo.opcua.stack.core.types.builtin.NodeId;
import org.eclipse.milo.opcua.stack.core.types.builtin.StatusCode;
import org.eclipse.milo.opcua.stack.core.types.builtin.Variant;
import org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.UByte;
import org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.UInteger;
import org.eclipse.milo.opcua.stack.core.types.structured.CreateSubscriptionResponse;
import org.eclipse.milo.opcua.stack.core.types.structured.DataChangeNotification;
import org.eclipse.milo.opcua.stack.core.types.structured.EventFieldList;
import org.eclipse.milo.opcua.stack.core.types.structured.EventNotificationList;
import org.eclipse.milo.opcua.stack.core.types.structured.ModifySubscriptionResponse;
import org.eclipse.milo.opcua.stack.core.types.structured.MonitoredItemNotification;
import org.eclipse.milo.opcua.stack.core.types.structured.NotificationMessage;
import org.eclipse.milo.opcua.stack.core.types.structured.PublishRequest;
import org.eclipse.milo.opcua.stack.core.types.structured.PublishResponse;
import org.eclipse.milo.opcua.stack.core.types.structured.RepublishResponse;
import org.eclipse.milo.opcua.stack.core.types.structured.RequestHeader;
import org.eclipse.milo.opcua.stack.core.types.structured.StatusChangeNotification;
import org.eclipse.milo.opcua.stack.core.types.structured.SubscriptionAcknowledgement;
import org.eclipse.milo.opcua.stack.core.util.ExecutionQueue;
import org.eclipse.milo.opcua.stack.core.util.Unit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static com.google.common.collect.Lists.newArrayList;
import static java.util.concurrent.CompletableFuture.completedFuture;
import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.uint;
import static org.eclipse.milo.opcua.stack.core.util.ConversionUtil.l;
import static org.eclipse.milo.opcua.stack.core.util.FutureUtils.failedUaFuture;
public class OpcUaSubscriptionManager implements UaSubscriptionManager {
public static final UInteger DEFAULT_MAX_NOTIFICATIONS_PER_PUBLISH = uint(65535);
private final Logger logger = LoggerFactory.getLogger(getClass());
private final Map<UInteger, OpcUaSubscription> subscriptions = Maps.newConcurrentMap();
private final List<SubscriptionListener> subscriptionListeners = Lists.newCopyOnWriteArrayList();
private final ConcurrentMap<NodeId, AtomicLong> pendingCountMap = Maps.newConcurrentMap();
private final ExecutionQueue deliveryQueue;
private final ExecutionQueue processingQueue;
private final OpcUaClient client;
public OpcUaSubscriptionManager(OpcUaClient client) {
this.client = client;
deliveryQueue = new ExecutionQueue(client.getConfig().getExecutor());
processingQueue = new ExecutionQueue(client.getConfig().getExecutor());
client.addSessionActivityListener(new SessionActivityListener() {
@Override
public void onSessionInactive(UaSession session) {
// This allows a session that gets re-activated to immediately start
// publishing again instead of waiting for outstanding PublishRequests
// from before the re-activation to expire/timeout.
pendingCountMap.replace(session.getSessionId(), new AtomicLong(0));
}
@Override
public void onSessionActive(UaSession session) {
maybeSendPublishRequests();
}
});
}
@Override
public CompletableFuture<UaSubscription> createSubscription(double requestedPublishingInterval) {
return createSubscription(
requestedPublishingInterval,
this::getLifetimeCount,
this::getMaxKeepAliveCount,
DEFAULT_MAX_NOTIFICATIONS_PER_PUBLISH,
true,
UByte.MIN
);
}
@Override
public CompletableFuture<UaSubscription> createSubscription(
double requestedPublishingInterval,
UInteger requestedLifetimeCount,
UInteger requestedMaxKeepAliveCount,
UInteger maxNotificationsPerPublish,
boolean publishingEnabled,
UByte priority) {
return createSubscription(
requestedPublishingInterval,
(p, c) -> requestedLifetimeCount,
p -> requestedMaxKeepAliveCount,
maxNotificationsPerPublish,
publishingEnabled,
priority
);
}
@Override
public CompletableFuture<UaSubscription> createSubscription(
double requestedPublishingInterval,
BiFunction<Double, UInteger, UInteger> getLifetimeCount,
Function<Double, UInteger> getMaxKeepAliveCount,
UInteger maxNotificationsPerPublish,
boolean publishingEnabled,
UByte priority) {
UInteger requestedMaxKeepAliveCount = getMaxKeepAliveCount.apply(requestedPublishingInterval);
UInteger requestedLifetimeCount = getLifetimeCount.apply(
requestedPublishingInterval, requestedMaxKeepAliveCount);
CompletableFuture<CreateSubscriptionResponse> future = client.createSubscription(
requestedPublishingInterval,
requestedLifetimeCount,
requestedMaxKeepAliveCount,
maxNotificationsPerPublish,
publishingEnabled, priority
);
return future.thenCompose(response -> {
OpcUaSubscription subscription = new OpcUaSubscription(
client,
response.getSubscriptionId(),
response.getRevisedPublishingInterval(),
response.getRevisedLifetimeCount(),
response.getRevisedMaxKeepAliveCount(),
maxNotificationsPerPublish,
publishingEnabled,
priority
);
subscription.setRequestedPublishingInterval(requestedPublishingInterval);
subscription.setRequestedLifetimeCount(requestedLifetimeCount);
subscription.setRequestedMaxKeepAliveCount(requestedMaxKeepAliveCount);
double revisedPublishingInterval = response.getRevisedPublishingInterval();
UInteger newMaxKeepAliveCount = getMaxKeepAliveCount.apply(revisedPublishingInterval);
if (requestedPublishingInterval != revisedPublishingInterval &&
!requestedMaxKeepAliveCount.equals(newMaxKeepAliveCount)) {
UInteger newLifetimeCount = getLifetimeCount.apply(revisedPublishingInterval, newMaxKeepAliveCount);
CompletableFuture<ModifySubscriptionResponse> modifyFuture = client.modifySubscription(
response.getSubscriptionId(),
revisedPublishingInterval,
newLifetimeCount,
newMaxKeepAliveCount,
maxNotificationsPerPublish,
priority
);
return modifyFuture.thenApply(modifyResponse -> {
subscription.setRequestedLifetimeCount(newLifetimeCount);
subscription.setRequestedMaxKeepAliveCount(newMaxKeepAliveCount);
subscription.setRevisedPublishingInterval(modifyResponse.getRevisedPublishingInterval());
subscription.setRevisedLifetimeCount(modifyResponse.getRevisedLifetimeCount());
subscription.setRevisedMaxKeepAliveCount(modifyResponse.getRevisedMaxKeepAliveCount());
subscriptions.put(subscription.getSubscriptionId(), subscription);
maybeSendPublishRequests();
return subscription;
});
} else {
subscriptions.put(subscription.getSubscriptionId(), subscription);
maybeSendPublishRequests();
return completedFuture(subscription);
}
});
}
private UInteger getMaxKeepAliveCount(double publishingInterval) {
int count = (int) Math.ceil(10000.0 / Math.max(1, publishingInterval));
return uint(Math.max(1, count));
}
private UInteger getLifetimeCount(double publishingInterval, UInteger maxKeepAliveCount) {
// Lifetime must be 3x (or greater) the keep-alive count.
BigInteger lifetimeCount = maxKeepAliveCount
.toBigInteger()
.multiply(BigInteger.valueOf(6))
.min(BigInteger.valueOf(UInteger.MAX_VALUE));
return uint(lifetimeCount.longValue());
}
@Override
public CompletableFuture<UaSubscription> modifySubscription(
UInteger subscriptionId,
double requestedPublishingInterval) {
OpcUaSubscription subscription = subscriptions.get(subscriptionId);
if (subscription == null) {
return failedUaFuture(StatusCodes.Bad_SubscriptionIdInvalid);
}
return modifySubscription(
subscriptionId,
requestedPublishingInterval,
this::getLifetimeCount,
this::getMaxKeepAliveCount,
subscription.getMaxNotificationsPerPublish(),
subscription.getPriority()
);
}
@Override
public CompletableFuture<UaSubscription> modifySubscription(
UInteger subscriptionId,
double requestedPublishingInterval,
UInteger requestedLifetimeCount,
UInteger requestedMaxKeepAliveCount,
UInteger maxNotificationsPerPublish,
UByte priority) {
return modifySubscription(
subscriptionId,
requestedPublishingInterval,
(p, c) -> requestedLifetimeCount,
p -> requestedMaxKeepAliveCount,
maxNotificationsPerPublish,
priority
);
}
@Override
public CompletableFuture<UaSubscription> modifySubscription(
UInteger subscriptionId,
double requestedPublishingInterval,
BiFunction<Double, UInteger, UInteger> getLifetimeCount,
Function<Double, UInteger> getMaxKeepAliveCount,
UInteger maxNotificationsPerPublish,
UByte priority) {
OpcUaSubscription subscription = subscriptions.get(subscriptionId);
if (subscription == null) {
return failedUaFuture(StatusCodes.Bad_SubscriptionIdInvalid);
}
UInteger requestedMaxKeepAliveCount = getMaxKeepAliveCount.apply(requestedPublishingInterval);
UInteger requestedLifetimeCount = getLifetimeCount.apply(
requestedPublishingInterval, requestedMaxKeepAliveCount);
CompletableFuture<ModifySubscriptionResponse> future = client.modifySubscription(
subscriptionId,
requestedPublishingInterval,
requestedLifetimeCount,
requestedMaxKeepAliveCount,
maxNotificationsPerPublish,
priority
);
return future.thenCompose(response -> {
subscription.setRequestedPublishingInterval(requestedPublishingInterval);
subscription.setRequestedLifetimeCount(requestedLifetimeCount);
subscription.setRequestedMaxKeepAliveCount(requestedMaxKeepAliveCount);
subscription.setRevisedPublishingInterval(response.getRevisedPublishingInterval());
subscription.setRevisedLifetimeCount(response.getRevisedLifetimeCount());
subscription.setRevisedMaxKeepAliveCount(response.getRevisedMaxKeepAliveCount());
subscription.setMaxNotificationsPerPublish(maxNotificationsPerPublish);
subscription.setPriority(priority);
double revisedPublishingInterval = response.getRevisedPublishingInterval();
UInteger newMaxKeepAliveCount = getMaxKeepAliveCount.apply(revisedPublishingInterval);
if (requestedPublishingInterval != revisedPublishingInterval &&
!requestedMaxKeepAliveCount.equals(newMaxKeepAliveCount)) {
UInteger newLifetimeCount = getLifetimeCount.apply(revisedPublishingInterval, newMaxKeepAliveCount);
CompletableFuture<ModifySubscriptionResponse> modifyFuture = client.modifySubscription(
subscriptionId,
revisedPublishingInterval,
newLifetimeCount,
newMaxKeepAliveCount,
maxNotificationsPerPublish,
priority
);
return modifyFuture.thenApply(modifyResponse -> {
subscription.setRequestedLifetimeCount(newLifetimeCount);
subscription.setRequestedMaxKeepAliveCount(newMaxKeepAliveCount);
subscription.setRevisedPublishingInterval(modifyResponse.getRevisedPublishingInterval());
subscription.setRevisedLifetimeCount(modifyResponse.getRevisedLifetimeCount());
subscription.setRevisedMaxKeepAliveCount(modifyResponse.getRevisedMaxKeepAliveCount());
maybeSendPublishRequests();
return subscription;
});
} else {
maybeSendPublishRequests();
return completedFuture(subscription);
}
});
}
@Override
public CompletableFuture<UaSubscription> deleteSubscription(UInteger subscriptionId) {
List<UInteger> subscriptionIds = newArrayList(subscriptionId);
return client.deleteSubscriptions(subscriptionIds).thenApply(r -> {
OpcUaSubscription subscription = subscriptions.remove(subscriptionId);
maybeSendPublishRequests();
return subscription;
});
}
public void transferFailed(UInteger subscriptionId, StatusCode statusCode) {
OpcUaSubscription subscription = subscriptions.remove(subscriptionId);
if (subscription != null) {
subscriptionListeners.forEach(l -> l.onSubscriptionTransferFailed(subscription, statusCode));
subscription.getNotificationListeners().forEach(
l ->
l.onSubscriptionTransferFailed(subscription, statusCode)
);
}
}
@Override
public ImmutableList<UaSubscription> getSubscriptions() {
return ImmutableList.copyOf(subscriptions.values());
}
@Override
public void addSubscriptionListener(SubscriptionListener listener) {
subscriptionListeners.add(listener);
}
@Override
public void removeSubscriptionListener(SubscriptionListener listener) {
subscriptionListeners.remove(listener);
}
private long getMaxPendingPublishes() {
long maxPendingPublishRequests = client.getConfig().getMaxPendingPublishRequests().longValue();
return subscriptions.isEmpty() ?
0 : Math.min(subscriptions.size() + 1, maxPendingPublishRequests);
}
private UInteger getTimeoutHint() {
double maxKeepAlive = subscriptions.values().stream()
.map(s -> s.getRevisedPublishingInterval() * s.getRevisedMaxKeepAliveCount().doubleValue())
.max(Comparator.naturalOrder())
.orElse(client.getConfig().getRequestTimeout().doubleValue());
long maxPendingPublishes = getMaxPendingPublishes();
double timeoutHint = maxPendingPublishes * maxKeepAlive * 1.5;
if (Double.isInfinite(timeoutHint) || timeoutHint > UInteger.MAX_VALUE) {
timeoutHint = 0d;
}
logger.debug(
"getTimeoutHint() maxKeepAlive={} maxPendingPublishes={} timeoutHint={}",
maxKeepAlive, maxPendingPublishes, timeoutHint);
return uint((long) timeoutHint);
}
private void maybeSendPublishRequests() {
long maxPendingPublishes = getMaxPendingPublishes();
if (maxPendingPublishes == 0) return;
client.getSession().thenAccept(session -> {
AtomicLong pendingCount = pendingCountMap.computeIfAbsent(
session.getSessionId(), id -> new AtomicLong(0L));
for (long i = pendingCount.get(); i < maxPendingPublishes; i++) {
if (pendingCount.incrementAndGet() <= maxPendingPublishes) {
sendPublishRequest(session, pendingCount);
} else {
pendingCount.getAndUpdate(p -> (p > 0) ? p - 1 : 0);
}
}
if (pendingCountMap.size() > 1) {
// Prune any old sessions...
pendingCountMap.entrySet().removeIf(e ->
!e.getKey().equals(session.getSessionId()));
}
});
}
private void sendPublishRequest(UaSession session, AtomicLong pendingCount) {
List<SubscriptionAcknowledgement> subscriptionAcknowledgements = new ArrayList<>();
subscriptions.values().forEach(subscription -> {
synchronized (subscription.availableAcknowledgements) {
subscription.availableAcknowledgements.forEach(sequenceNumber ->
subscriptionAcknowledgements.add(new SubscriptionAcknowledgement(
subscription.getSubscriptionId(),
sequenceNumber
))
);
subscription.availableAcknowledgements.clear();
}
});
RequestHeader requestHeader = client.getStackClient().newRequestHeader(
session.getAuthenticationToken(),
getTimeoutHint()
);
UInteger requestHandle = requestHeader.getRequestHandle();
PublishRequest request = new PublishRequest(
requestHeader,
subscriptionAcknowledgements.toArray(new SubscriptionAcknowledgement[0])
);
if (logger.isDebugEnabled()) {
String[] ackStrings = subscriptionAcknowledgements.stream()
.map(ack -> String.format("id=%s/seq=%s",
ack.getSubscriptionId(), ack.getSequenceNumber()))
.toArray(String[]::new);
logger.debug(
"Sending PublishRequest, requestHandle={}, acknowledgements={}",
requestHandle, Arrays.toString(ackStrings));
}
client.<PublishResponse>sendRequest(request).whenComplete((response, ex) -> {
if (response != null) {
logger.debug("Received PublishResponse, sequenceNumber={}",
response.getNotificationMessage().getSequenceNumber());
processingQueue.submit(() -> onPublishComplete(response, pendingCount));
} else {
StatusCode statusCode = UaException.extract(ex)
.map(UaException::getStatusCode)
.orElse(StatusCode.BAD);
logger.debug("Publish service failure (requestHandle={}): {}", requestHandle, statusCode, ex);
pendingCount.getAndUpdate(p -> (p > 0) ? p - 1 : 0);
if (statusCode.getValue() != StatusCodes.Bad_NoSubscription &&
statusCode.getValue() != StatusCodes.Bad_TooManyPublishRequests) {
maybeSendPublishRequests();
}
UaException uax = UaException.extract(ex).orElse(new UaException(ex));
subscriptionListeners.forEach(l -> l.onPublishFailure(uax));
}
});
}
private void onPublishComplete(PublishResponse response, AtomicLong pendingCount) {
logger.debug("onPublishComplete() response for subscriptionId={}", response.getSubscriptionId());
UInteger subscriptionId = response.getSubscriptionId();
OpcUaSubscription subscription = subscriptions.get(subscriptionId);
if (subscription == null) {
pendingCount.getAndUpdate(p -> (p > 0) ? p - 1 : 0);
maybeSendPublishRequests();
return;
}
NotificationMessage notificationMessage = response.getNotificationMessage();
long sequenceNumber = notificationMessage.getSequenceNumber().longValue();
long expectedSequenceNumber = subscription.getLastSequenceNumber() + 1;
if (sequenceNumber > expectedSequenceNumber) {
logger.warn("[id={}] expected sequence={}, received sequence={}. Calling Republish service...",
subscriptionId, expectedSequenceNumber, sequenceNumber);
processingQueue.pause();
processingQueue.submitToHead(() -> onPublishComplete(response, pendingCount));
republish(subscriptionId, expectedSequenceNumber, sequenceNumber).whenComplete((dataLost, ex) -> {
if (ex != null) {
logger.debug("Republish failed: {}", ex.getMessage(), ex);
subscriptionListeners.forEach(l -> l.onNotificationDataLost(subscription));
subscription.getNotificationListeners().forEach(l -> l.onNotificationDataLost(subscription));
} else {
// Republish succeeded, possibly with some data loss, resume processing.
if (dataLost) {
subscriptionListeners.forEach(l -> l.onNotificationDataLost(subscription));
subscription.getNotificationListeners().forEach(l -> l.onNotificationDataLost(subscription));
}
}
subscription.setLastSequenceNumber(sequenceNumber - 1);
processingQueue.resume();
});
return;
}
if (notificationMessage.getNotificationData() != null &&
notificationMessage.getNotificationData().length > 0) {
// Set last sequence number only if this isn't a keep-alive
subscription.setLastSequenceNumber(sequenceNumber);
}
UInteger[] availableSequenceNumbers = response.getAvailableSequenceNumbers();
synchronized (subscription.availableAcknowledgements) {
subscription.availableAcknowledgements.clear();
if (availableSequenceNumbers != null && availableSequenceNumbers.length > 0) {
Collections.addAll(subscription.availableAcknowledgements, availableSequenceNumbers);
}
}
if (logger.isDebugEnabled() && availableSequenceNumbers != null) {
String[] seqStrings = Arrays.stream(availableSequenceNumbers)
.map(sequence -> String.format("id=%s/seq=%s", subscriptionId, sequence))
.toArray(String[]::new);
logger.debug(
"[id={}] PublishResponse sequence={}, available sequences={}",
subscriptionId, sequenceNumber, Arrays.toString(seqStrings));
}
DateTime publishTime = notificationMessage.getPublishTime();
logger.debug("onPublishComplete(), subscriptionId={}, sequenceNumber={}, publishTime={}",
subscriptionId, notificationMessage.getSequenceNumber(), publishTime);
deliverNotificationMessage(subscription, notificationMessage).thenRunAsync(
() -> {
pendingCount.getAndUpdate(p -> (p > 0) ? p - 1 : 0);
maybeSendPublishRequests();
},
client.getConfig().getExecutor()
);
}
private CompletableFuture<Boolean> republish(UInteger subscriptionId, long fromSequence, long toSequence) {
CompletableFuture<Boolean> future = new CompletableFuture<>();
republish(subscriptionId, fromSequence, toSequence, false, future);
return future;
}
private void republish(UInteger subscriptionId,
long fromSequence,
long toSequence,
boolean dataLost,
CompletableFuture<Boolean> future) {
if (fromSequence == toSequence) {
future.complete(dataLost);
} else {
client.republish(subscriptionId, uint(fromSequence)).whenComplete((response, ex) -> {
if (response != null) {
try {
onRepublishComplete(subscriptionId, response, uint(fromSequence));
republish(subscriptionId, fromSequence + 1, toSequence, dataLost, future);
} catch (UaException e) {
republish(subscriptionId, fromSequence + 1, toSequence, true, future);
}
} else {
StatusCode statusCode = UaException.extract(ex)
.map(UaException::getStatusCode)
.orElse(StatusCode.BAD);
if (statusCode.getValue() == StatusCodes.Bad_MessageNotAvailable) {
republish(subscriptionId, fromSequence + 1, toSequence, true, future);
} else {
future.completeExceptionally(ex);
}
}
});
}
}
private void onRepublishComplete(UInteger subscriptionId,
RepublishResponse response,
UInteger expectedSequenceNumber) throws UaException {
NotificationMessage notificationMessage = response.getNotificationMessage();
UInteger sequenceNumber = notificationMessage.getSequenceNumber();
if (!sequenceNumber.equals(expectedSequenceNumber)) {
throw new UaException(StatusCodes.Bad_SequenceNumberInvalid,
"expected sequence=" + expectedSequenceNumber + ", received sequence=" + sequenceNumber);
}
DateTime publishTime = notificationMessage.getPublishTime();
logger.debug("onRepublishComplete(), subscriptionId={}, sequenceNumber={}, publishTime={}",
subscriptionId, notificationMessage.getSequenceNumber(), publishTime);
OpcUaSubscription subscription = subscriptions.get(subscriptionId);
if (subscription != null) {
deliverNotificationMessage(subscription, notificationMessage);
}
}
private CompletableFuture<Unit> deliverNotificationMessage(
OpcUaSubscription subscription, NotificationMessage notificationMessage) {
CompletableFuture<Unit> delivered = new CompletableFuture<>();
subscription.getNotificationSemaphore().acquire().thenAccept(permit -> deliveryQueue.submit(() -> {
try {
Map<UInteger, OpcUaMonitoredItem> items = subscription.getItemsByClientHandle();
List<ExtensionObject> notificationData = l(notificationMessage.getNotificationData());
if (notificationData.isEmpty()) {
subscriptionListeners.forEach(
listener -> listener.onKeepAlive(subscription, notificationMessage.getPublishTime())
);
subscription.getNotificationListeners().forEach(
listener -> listener.onKeepAliveNotification(
subscription, notificationMessage.getPublishTime())
);
}
for (ExtensionObject xo : notificationData) {
Object o = xo.decode(client.getStaticSerializationContext());
if (o instanceof DataChangeNotification) {
DataChangeNotification dcn = (DataChangeNotification) o;
List<MonitoredItemNotification> monitoredItemNotifications = l(dcn.getMonitoredItems());
int notificationCount = monitoredItemNotifications.size();
logger.debug("Received {} MonitoredItemNotifications", notificationCount);
for (MonitoredItemNotification min : monitoredItemNotifications) {
logger.trace("MonitoredItemNotification: clientHandle={}, value={}",
min.getClientHandle(), min.getValue());
OpcUaMonitoredItem item = items.get(min.getClientHandle());
if (item != null) item.onValueArrived(min.getValue());
else logger.warn("no item for clientHandle=" + min.getClientHandle());
}
if (notificationCount == 0) {
subscriptionListeners.forEach(
listener -> listener.onKeepAlive(subscription, notificationMessage.getPublishTime())
);
subscription.getNotificationListeners().forEach(
listener -> listener.onKeepAliveNotification(
subscription, notificationMessage.getPublishTime())
);
} else {
if (!subscription.getNotificationListeners().isEmpty()) {
List<UaMonitoredItem> monitoredItems = new ArrayList<>();
List<DataValue> dataValues = new ArrayList<>();
for (MonitoredItemNotification n : monitoredItemNotifications) {
UaMonitoredItem item = subscription
.getItemsByClientHandle().get(n.getClientHandle());
if (item != null) {
monitoredItems.add(item);
dataValues.add(n.getValue());
}
}
subscription.getNotificationListeners().forEach(
listener -> listener.onDataChangeNotification(
subscription,
monitoredItems,
dataValues,
notificationMessage.getPublishTime()
)
);
}
}
} else if (o instanceof EventNotificationList) {
EventNotificationList enl = (EventNotificationList) o;
List<EventFieldList> eventFieldLists = l(enl.getEvents());
for (EventFieldList efl : eventFieldLists) {
logger.trace("EventFieldList: clientHandle={}, values={}",
efl.getClientHandle(), Arrays.toString(efl.getEventFields()));
OpcUaMonitoredItem item = items.get(efl.getClientHandle());
if (item != null) item.onEventArrived(efl.getEventFields());
}
if (!subscription.getNotificationListeners().isEmpty()) {
List<UaMonitoredItem> monitoredItems = new ArrayList<>();
List<Variant[]> eventFields = new ArrayList<>();
for (EventFieldList efl : eventFieldLists) {
UaMonitoredItem item = subscription
.getItemsByClientHandle().get(efl.getClientHandle());
if (item != null) {
monitoredItems.add(item);
eventFields.add(efl.getEventFields());
}
}
subscription.getNotificationListeners().forEach(
listener -> listener.onEventNotification(
subscription,
monitoredItems,
eventFields,
notificationMessage.getPublishTime()
)
);
}
} else if (o instanceof StatusChangeNotification) {
StatusChangeNotification scn = (StatusChangeNotification) o;
logger.debug("StatusChangeNotification: {}", scn.getStatus());
subscriptionListeners.forEach(
listener -> listener.onStatusChanged(subscription, scn.getStatus())
);
subscription.getNotificationListeners().forEach(
listener -> listener.onStatusChangedNotification(subscription, scn.getStatus())
);
if (scn.getStatus().getValue() == StatusCodes.Bad_Timeout) {
subscriptions.remove(subscription.getSubscriptionId());
}
}
}
} finally {
permit.release();
delivered.complete(Unit.VALUE);
}
}));
return delivered;
}
public void startPublishing() {
maybeSendPublishRequests();
}
public void clearSubscriptions() {
subscriptions.clear();
}
public void pauseDelivery() {
deliveryQueue.pause();
}
public void resumeDelivery() {
deliveryQueue.resume();
}
}