Package com.vaadin.flow.server.communication

Class LongPollingCacheFilter

java.lang.Object

com.vaadin.flow.server.communication.LongPollingCacheFilter

All Implemented Interfaces:

Serializable, org.atmosphere.cpr.BroadcastFilter, org.atmosphere.cpr.PerRequestBroadcastFilter

public class LongPollingCacheFilter
extends Object
implements org.atmosphere.cpr.PerRequestBroadcastFilter, Serializable

A PerRequestBroadcastFilter implementation that handles AtmospherePushConnection.PushMessages to ensure that a message is preserved in the BroadcasterCache until the client has received it. The filter acts only on LONG POLLING transport and expects that the client sends the X-Vaadin-LastSeenServerSyncId header with the identifier of the last message seen, every time the connection is established. Messages already seen are discarded, whereas messages not yet sent to the client are added again to the cache to preserve them until client confirms reception by sending the last seen message identifier.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from interface org.atmosphere.cpr.BroadcastFilter

org.atmosphere.cpr.BroadcastFilter.BroadcastAction

Field Summary

Fields

Modifier and Type	Field	Description
static String	SEEN_SERVER_SYNC_ID

Fields inherited from interface org.atmosphere.cpr.BroadcastFilter

VOID_ATMOSPHERE_RESOURCE_UUID

Constructor Summary

Constructors

Constructor	Description
LongPollingCacheFilter()

Method Summary

Modifier and Type	Method	Description
org.atmosphere.cpr.BroadcastFilter.BroadcastAction	filter(String broadcasterId, Object originalMessage, Object message)
org.atmosphere.cpr.BroadcastFilter.BroadcastAction	filter(String broadcasterId, org.atmosphere.cpr.AtmosphereResource r, Object originalMessage, Object message)

Methods inherited from class java.lang.Object

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

Field Detail

SEEN_SERVER_SYNC_ID

public static final String SEEN_SERVER_SYNC_ID

See Also:

Constant Field Values

Constructor Detail

LongPollingCacheFilter

public LongPollingCacheFilter()

Method Detail

filter

public org.atmosphere.cpr.BroadcastFilter.BroadcastAction filter(String broadcasterId,
                                                                 org.atmosphere.cpr.AtmosphereResource r,
                                                                 Object originalMessage,
                                                                 Object message)

Specified by:

filter in interface org.atmosphere.cpr.PerRequestBroadcastFilter

filter

public org.atmosphere.cpr.BroadcastFilter.BroadcastAction filter(String broadcasterId,
                                                                 Object originalMessage,
                                                                 Object message)

Specified by:

filter in interface org.atmosphere.cpr.BroadcastFilter