Confused with IcePack

Re: Confused with IcePack

Originally posted by amrufon
Hello.

I was able to get my Ice project going the standard client and server mechanism where the in the client, the IP address of the server is explicitly declared during initialization or direct binding.

So now, I want to use the IcePack facility ... unfortunately, I'm getting bewildered with the documentation and when I looked into the IcePack Hello demo ... I got more confused.

As a background, what I want to do are two things:
1. Indirect binding with one server adapter and many clients.
2. Indirect binding where on one server, I'll run multiple copies of my Ice server application but with different (but well defined) adapter names. ex. jsockets01, jsockets02, jsockets03, etc. Of course the clients should be able to connect to specific adapters that they need.
NOTE: I dont need IcePack NODES. I manually start the servers.

So what am I confused about? Well, I'll list them:
1. What to put into the config file?
- I understand the the config file should be passed as parameter to the icepackregistry program but what do I put into it to address my requirements.

You need to put the following properties in the IcePack registry configuration file (let's assume it's called config_icepack):

IcePack.Registry.Client.Endpoints=default -p 11000
IcePack.Registry.Server.Endpoints=default
IcePack.Registry.Admin.Endpoints=default
IcePack.Registry.Data=<path to the directory of the IcePack registry database directory>
IcePack.Registry.DynamicRegistration=1

The endpoint properties will configure IcePack endpoints, only the client endpoint needs to have a fixed port. The database directory must exist to start the registry. The DynamicRegistration property needs to be set to 1 to allow non-registered adapters to be added when they are activated. Start the IcePack registry with this configuration file in a terminal:

bash$ mkdir db
bash$ icepackregistry --Ice.Config=config_icepack

2. How do I change the server so that it would use this facility?

I would change your server code to the following:

 Ice::ObjectAdapterPtr adapter = communicator()->createObjectAdapter("jclCommandAdapter");
 Ice::ObjectPtr object = new jSocketsI;
 adapter->add(object, Ice::stringToIdentity("jclCommand"));
 adapter->activate();

Then you start each server with the following configuration file (let's assume it's called config_server):

jclCommandAdapter.Endpoints=default -z
jclCommandAdapter.AdapterId=jsocket01
Ice.Default.Locator=IcePack/Locator:default -h <registry host name> -p 11000

Of course, you need to change the AdapterId property for each of your servers and "<registry host name>" should be replaced by the host name where the IcePack registry is running. Start each server with this configuration file (i.e.: by passing the --Ice.Config=config_server command line argument).

3. How do I change the client initialization to use the IcePack adapter?

I would recommend to use a property in your client to configure the proxy of the object you want to use:

// Create a proxy for the root directory
std::string proxy = ic->getProperties()->getProperty("Proxy");
Ice::ObjectPrx base = ic->stringToProxy(proxy);

In your client configuration file (let's assume it's called config_client), you need to set the following properties:

Proxy=jclCommand@jsocket01
Ice.Default.Locator=IcePack/Locator:default -h <registry host name> -p 11000

Start your client with this configuration file (i.e.: by passing the --Ice.Config=config_client command line argument...).

unfortunately, I'm having a hard time understanding again the docs and the sample in IcePack/Hello/Client.cpp file is no help.

Can somebody explain what is actually required in a straight forward manner?

Thanks for any help.

Yes, forget about the IcePack/Hello demo . This demo demonstrates the use of the IcePack registry, node and deployment mechanism which is a little more complicated than just using the registry with manually launched servers.

The Ice/hello demo actually contains some configuration to use the hello world demo in a similar scenario (i.e.: indirect binding, manually launched server). Here's some instructions on how to use it (I assume your current directory is Ice-1.1.0/demo/Ice/hello):

• In a terminal, start the IcePack registry:
  bash$ mkdir db
  bash$ icepackregistry --Ice.Config=config
• Edit the demo/Ice/hello/config file to uncomment the last 4 lines (these lines configure the Hello server and client to use the IcePack registry)
• In another terminal start the server:
  bash$ ./server
• In another terminal start the client:
  bash$ ./client --Ice.Trace.Location=1

Let me know if these instructions are not clear enough!

Benoit.

I am coufused by the property"IcePack.Registry.Server.Endpoints".

The doc said:
Defines the endpoints of the IcePack server interface. The server endpoints must be accessible to Ice servers that are using IcePack to register their object adapter
endpoints.


So I think that these endpoints are used by ice servers to communicate to register their adapters or objects.

According to this idea, I try the fellowing configurations,

－－－－－－－ config--icepackregistry

---

IcePack.Registry.Client.Endpoints=default -p 10006
IcePack.Registry.Server.Endpoints=default -p 10000
IcePack.Registry.Internal.Endpoints=default
IcePack.Registry.Admin.Endpoints=default
IcePack.Registry.Data=db
IcePack.Registry.DynamicRegistration=1


－－－－－－－－ config-client

---

Hello.Proxy=hello@HelloAdapter
Ice.Default.Locator=IcePack/Locator:default -p 10006


－－－－－－－－－config-server

---

Hello.Endpoints=tcp:udp:ssl
Hello.AdapterId=HelloAdapter
Ice.Default.Locator=IcePack/Locator:default -p 10000



But When I run the server.exe, I got errors:


.\Outgoing.cpp:359: Ice::ObjectNotExistException:
object does not exist
identity: IcePack/Locator
facet:
operation: getRegistry

It seems that I misunderstood something about the property. Can anyone help me?

Thanks a lot.

But , I still feel confused by this property. Could you give me some examples in that we have to set the "IcePack.Registry.Server.Endpoints" instead of the default value?

And , How to understand the "Client" and "Server" concepts in this circumstance of icpackregistry?

Sorry,I can not deeply understand the property discribed by the doc due to my English.


Best regards.

Thank you.
I will try to dig into the souce codes to find more answers.