Newbi question about Extend...

I have just started to look into using Extend to develop some developer utility tools. When reading the documentation it is not clear to me if a cache (lets say a near cache) can be accessed BOTH by extend clients and cluster members and in that case is there some example on how to do the cache configuration (both on extend client and cluster members)?
What made me believe that it would NOT be possible is that one must decide what cache service that should handle each cache so it can either be handled by an ExtendService OR DistributedCacheService or perhaps I have got this all wrong?
/Magnus

Hi Magnus,
maybe I did not totally understand the question.
With Extend clients the client does not actually access the cache in the cluster. The proxy server does it for them and for RT clients it also propagates events to the client (which is necessary for the near cache entry invalidation on changes). So in case of the extend client, the operative part of the description of the behaviour is the remote/proxy and the only requirement is that there needs to be a NamedCache of the same name in the cluster the proxy node is a member of. What that cache in the cluster is is just a configuration detail not actually exposed at all to the client.
The operative part of a near cache is the (size limited due to being in-JVM but very fast) front map (usually a LocalCache) and SOME KIND OF (which needs not be size limited, and is usually slower) back cache from which entries can be fetched and which provides a synchronous invalidation event to the listener the front map registers on the back cache. The type of the back cache is just a configuration detail. The only requirement is that the back cache needs to implement ObservableMap (for registering a synchronous listener for invalidation events) and CacheMap (for optimized put operations) and InvocableMap (for optimized remove operations)... which is expressed as the back cache has to implement NamedCache.
In the usual understanding the back cache of a near cache is configured to be a distributed cache, but it is nowhere mandated to be a distributed cache.
Indeed, in the extend clients the back cache of the near cache is a remote cache (proxied cache), which is in fact a client proxy (stub) implementing the NamedCache interface to the proxy server which adapts the named cache with the same name in the TCMP cluster which again wouldn't necessarily need to be a distributed cache.
In short, a near cache is just a cache which is as NEAR to you and as fast as possible. A remote cache is just that, a cache which sits on the other end of the TCP*Extend connection.
I hope this clears it up.
Best regards,
Robert

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</NewUser>
5) If the test succeeds, you are ready to create the Flex application. If not, figure out why.
6) Build a Flex app. Once you deployed the process, the remoting endpoint is automatically created and can be accessed by Flex. Here is a stub.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="initChannelSet()">
<mx:Script>
<![CDATA[
import mx.messaging.channels.AMFChannel;
import mx.messaging.ChannelSet;
import mx.rpc.events.ResultEvent;
import mx.rpc.events.FaultEvent;
private function initChannelSet():void {
var cs:ChannelSet= new ChannelSet();
cs.addChannel(new AMFChannel("my-amf","http://localhost:8080/remoting/messagebroker/amf"));
ro.channelSet = cs;
private function submitRequest():void {
var newUser:XML = new XML(getXmlData());
ro.setCredentials("administrator","password");
ro.invoke({newUserXml:newUser});
private function remotingResultHandler(event:ResultEvent):void {
var userID:String = event.result.userID;
private function remotingFaultHandler(event:FaultEvent):void {
Alert.show(event.fault.faultDetail.toString());
private function getXmlData():String {
var xmlStr:String = "<NewUser>"
+ "<Login>" + login.text + "</Login>"
+ "<Password>" + password.text + "</Password>"
+ "<CommonName>" + commonName.text + "</CommonName>"
+ "</NewUser>>";
return (xmlStr);
]]>
</mx:Script>
<mx:RemoteObject id="ro" destination="MyApplication/processes/CreateNewUser"
   result="remotingResultHandler(event)" fault="remotingFaultHandler(event)"/>
<mx:VBox>
   UI goes here...
   <mx:Button label="Submit" click="submitRequest()"/>
</mx:VBox>
</mx:Application>
Steve

Newbi question about Extend...

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