org.eclipse.milo.opcua.sdk.server.subscriptions

Class PublishQueue

java.lang.Object

org.eclipse.milo.opcua.sdk.server.subscriptions.PublishQueue

public class PublishQueue
extends Object

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	PublishQueue.WaitingSubscription

Constructor Summary

Constructors

Constructor and Description
PublishQueue()

Method Summary

Modifier and Type	Method and Description
void	addRequest(ServiceRequest<PublishRequest,PublishResponse> service) Add a Publish ServiceRequest to the queue.
void	addSubscription(Subscription subscription) Add a subscription to the wait list.
boolean	isEmpty()
boolean	isNotEmpty()
ServiceRequest<PublishRequest,PublishResponse>	poll()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

PublishQueue

public PublishQueue()

Method Detail

addRequest

public void addRequest(ServiceRequest<PublishRequest,PublishResponse> service)

Add a Publish ServiceRequest to the queue.

If there are wait-listed Subscriptions this request will be used immediately, otherwise it will be queued for later use by a Subscription whose publish timer has expired and has notifications to send.

Parameters:

service - the Publish ServiceRequest.

addSubscription

public void addSubscription(Subscription subscription)

Add a subscription to the wait list.

A subscription should be added to the wait list when either:

a) The previous Publish response indicated that there were still more Notifications ready to be transferred and there were no more Publish requests queued to transfer them.

b) The publishing timer of a Subscription expired and there were either Notifications to be sent or a keep-alive Message to be sent.

Parameters:

subscription - the subscription to wait-list.

isEmpty

public boolean isEmpty()

isNotEmpty

public boolean isNotEmpty()

poll

@Nullable
public ServiceRequest<PublishRequest,PublishResponse> poll()