Examples of flex.messaging.MessageClient

flex.messaging.MessageClient
Represents a client-side MessageAgent instance. Currently a server-side MessageClient is only created if its client-side counterpart has subscribed to a destination for pushed data (e.g. Consumer). Client-side Producers do not result in the creation of corresponding server-side MessageClient instances. Client-side MessageAgents communicate with the server over a Channel that corresponds to a FlexSession. Server-side MessageClient instances are always created in the context of a FlexSession and when the FlexSession is invalidated any associated MessageClients are invalidated as well. MessageClients may also be timed out on a per-destination basis and this is based on subscription inactivity. If no messages are pushed to the MessageClient within the destination's subscription timeout period the MessageClient will be shutdown even if the associated FlexSession is still active and connected. Per-destination subscription timeout is an optional configuration setting, and should only be used when inactive subscriptions should be shut down opportunistically to preserve server resources.


    public MessageClient getMessageClient(Object clientId, String endpointId) 
    {
        synchronized (allSubscriptions)
        {
            MessageClient client = (MessageClient) allSubscriptions.get(clientId);
            if (client == null)
            {
                client = newMessageClient(clientId, endpointId);
                allSubscriptions.put(clientId, client);
            }


            client.incrementReferences();
            return client;
        }
    }

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                SubscriptionManager subscriptionManager = destination.getSubscriptionManager();


                for (Iterator clientIter = subscriberIds.iterator(); clientIter.hasNext();)
                {
                    Object clientId = clientIter.next();
                    MessageClient client = (MessageClient)subscriptionManager.getSubscriber(clientId);


                    // Skip if the client is null or invalidated.
                    if (client == null || !client.isValid())
                    {
                        if (Log.isDebug())
                            Log.getLogger(MessageService.LOG_CATEGORY).debug("Warning: could not find MessageClient for clientId in pushMessageToClients: " + clientId + " for destination: " + destination.getId());


                        continue;

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        {
            // This code path handles poll messages sent by Consumer.receive().
            // This API should not trigger server side waits, so we invoke poll
            // and if there are no queued messages for this Consumer instance we
            // return an empty acknowledgement immediately.
            MessageClient client = null;
            try
            {
                client = subscriptionManager.getMessageClient(clientId, endpointId);


                if (client != null)
                {
                    if (adapter.handlesSubscriptions())
                    {
                        List missedMessages = (List)adapter.manage(command);
                        if (missedMessages != null && !missedMessages.isEmpty())
                        {
                            MessageBroker broker = getMessageBroker();
                            for (Iterator iter = missedMessages.iterator(); iter.hasNext();)
                                broker.routeMessageToMessageClient((Message)iter.next(), client);
                        }
                    }
                    FlushResult flushResult = client.getFlexClient().poll(client);
                    List messagesToReturn = (flushResult != null) ? flushResult.getMessages() : null;
                    if (messagesToReturn != null && !messagesToReturn.isEmpty())
                    {
                        replyMessage = new CommandMessage(CommandMessage.CLIENT_SYNC_OPERATION);
                        replyMessage.setBody(messagesToReturn.toArray());

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    private void invalidateMessageClient(JMSConsumer consumer, flex.messaging.messages.Message message)
    {
        String clientId = (String)consumerToClientId.get(consumer);
        if (clientId != null && messageClients.containsKey(clientId))
        {
            MessageClient messageClient = (MessageClient)messageClients.get(clientId);


            if (Log.isInfo())
                Log.getLogger(JMSAdapter.LOG_CATEGORY).info("The corresponding MessageClient for JMS consumer for JMS destination '" 
                        + consumer.getDestinationJndiName() + "' is being invalidated");
            
            messageClient.invalidate(message);            
        }
    }

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        {
            String endpointId = getId();            
            List messageClients = flexClient.getMessageClients();
            for (Iterator iter = messageClients.iterator(); iter.hasNext();)
            {
                MessageClient messageClient = (MessageClient)iter.next();
                if (messageClient.getEndpointId().equals(endpointId))
                {
                    messageClient.setClientChannelDisconnected(true);
                    messageClient.invalidate();
                }
            }
        }
        
        // And optionally invalidate the session.

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