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    brohitbrose
    @brohitbrose

    @kumarsen26
    While we don't have a full-fledged tutorial for what you're looking for, it follows the process here: https://github.com/swimos/transit#run-as-a-fabric
    The main idea is that Web Agents can be distributed over multiple machines, yet each machine can serve data from Web Agents that run on a different machine (e.g. downlinking to a Web Agent that runs on machine2 will work, even if you set your hostUri=machine1). This works because Swim servers automatically abstract over the load balancing logic that you described.

    You'll have to seed each server is seeded with the right recon file. I recommend reading the run scripts and the .recon configuration files, then asking us any questions if anything is unclear.

    kumarsen26
    @kumarsen26

    Hi,

    In client, I am getting below response in client side when trying to read value from mapLane.

    What I am getting.. (@Customer and @ContactInfo is the object name)

    {
      "@Customer": null,
      "firstName": "kumar",
      "lastName": "Raju",
      "dob": "1990-09-09",
      "contactInfo": [
        {
          "@ContactInfo": null,
          "email": "test@gmail.com",
          "phone": "1252425262"
        }
      ]
    }

    Expected is

    {
      "firstName": "kumar",
      "lastName": "Raju",
      "dob": "1990-09-09",
      "contactInfo": [
        {
          "email": "test@gmail.com",
          "phone": "1252425262"
        }
      ]
    }

    My Client code:

    swim.downlinkMap().hostUri(HOST).nodeUri('/customer').laneUri('details').open().didUpdate((key,value) => {
              console.log({...value.toAny()});})

    I am not sure what I am missing.. Could you point the mistake.

    brohitbrose
    @brohitbrose

    Hard to say for sure without seeing the server code. But you can skip to past the --- for my suggested fix.

    My hypothesis is that this is actually the expected behavior. I assume that

    1. You have a Customer Java object with firstName, lastName, dob, and contactInfo
    2. The type of contactInfo is ContactInfo[]

    Then the recon (not JSON) serialization of your object will look like:
    @Customer{firstName:kumar,lastName:Raju,dob:"1990-09-09",contactInfo:{@ContactInfo{email:"test@gmail.com",phone:"1252425262"}}}, assuming that you used annotations instead of manually writing the Form<Customer>.

    When a serialization looks like @foo{bar:a,baz:b}, the swim.structure representation of this is actually a three-length Record (i.e. a collection of Items) whose first item is an Attr with key foo and undefined value; second Item is a Slot with key bar and value a; last Item is a Slot with key baz and value b. It is by design that an Attr appears "raised" even though it is in the same structural level. JSON does not differentiate between "special" key-value pairs like Attr vs Slot, so when you translate an Attr-containing object to JSON, it simply appears as a "regular" key-value pair with @ in it.

    ---

    To get everything except for the first Item in a Record, you should be able to call tail() on it. On the shorter example above, you should see (in JSON) {bar:a,baz:b}. In your example, you would need to do this twice to handle the nested ContactInfo type object.

    @kumarsen26 ^
    kumarsen26
    @kumarsen26

    @brohitbrose
    Please find server code.. I hope this helps..

    Plane:

    @SwimRoute("/customer")
      private AgentRoute<Customer> customer;

    Lane:

    @SwimLane("details")
        MapLane<String, Customer> view = this.<String, Customer>mapLane().didUpdate((key, newValue, oldValue) -> {
            System.out.println("the new value is " + newValue.toString());
        });
    brohitbrose
    @brohitbrose
    @kumarsen26 and what happens when you replace your Client code with:
    didUpdate((key,value) => {
        console.log(value.tail());
    });
    kumarsen26
    @kumarsen26

    @brohitbrose I am getting values as attached in the screenshot.

    image.png

    brohitbrose
    @brohitbrose

    good, the lower and upper bounds to the Record are correct. Let's now try:

    didUpdate((key,value) => {
        let customerDetails = value.tail();
        let contactInfoDetails = value.get("contactInfo");
    });

    Can you log these values using your method of choice and show the results?

    @kumarsen26 if you need the final result to be in a specific JSON format, it would be best to have a separate function to return a new object containing the final result. You should be able to build this object from customerDetails and contactInfoDetails (this might take a little more processing, maybe something like contactInfoDetails.getItem(0).tail() for the first value since it's an Array)as defined above
    NITESH
    @NITESHMEHTA68_twitter
    i want to learn swin from basic
    and want to become contributor
    any one help me
    Dobromir Marinov
    @DobromirM
    @NITESHMEHTA68_twitter You can get familiar with the core Swim concepts here: https://www.swimos.org/concepts/ and check the tutorials: https://www.swimos.org/tutorials/ to get started.
    Rikki
    @Yukaira
    Hey, i was reading the readme on swimos LED matrix driver and i saw that you could both run the server and client on the Pi, how would that work?
    kumarsen26
    @kumarsen26
    Hi Team,
    I am trying to access my swim-server using wss://localhost:9001 (secure websocket). Is it supported? if so do I need to do some configuration at server side? Kindly let me know if any example which i can refer
    brohitbrose
    @brohitbrose
    @Yukaira any device, including a Pi, that can concurrently run multiple processes will be able to run the server and client at once
    @kumarsen26 doing so requires setting up the server in a specific way that includes, among other things, certs on the machine and a Swim configuration that points to those certs. If you have certs ready, then we can walk you through how to do that
    brohitbrose
    @brohitbrose
    @kumarsen26 note that no additional configurations are needed if you configure the server without wss, i.e. use ws://localhost:9001
    kumarsen26
    @kumarsen26
    @brohitbrose Thank you .. Ok I will check and get back once I get the certificate..
    Thee, Meepeek
    @meepeek
    I'm new here. I read the web and have some questions
    1. How to scale out ? Can I run a dynamic cluster ?
    2. how to backup and administrate ? can I store a file as well ?
    3. Can I just run the Java server then use a nodejs server to handle logic ? or I need to program everything in Java for the server ?
    4. How the cache and security works ? should let the client contact swim server directly or through proxy ?
    5. How about authorize and access control ?
    Ajay.Gov
    @ajay-gov

    @meepeek Good questions.

    1. You can run swim in a cluster. Please look at this example of the transit application in a 2 node cluster: https://github.com/swimos/transit#run-as-a-fabric
    2. All swim lanes can be persisted if you turn the persistence option on. This is part of our enterprise offering. If you turn the persistence option on, then the data stored in the lanes for all agents of a specific type will get written into files on disk which you could then back up.
    3. Ideally it's best to program all the server side logic in java using the SwimOS platform
    4. The client can connect to the swim server directly. Web agents expose endpoints and streaming APIs, so data from the lanes will get streamed to your client
    5. You can configure access control and authorization programmatically. This typically done by injecting an Authenticator and a Policy to the Swim Plane. Here is an example from the cellular app: https://github.com/swimos/swim-cellular/blob/master/src/main/java/swim/cellular/CellularPlane.java#L24-L30

    Please do let us know if you have any other questions. Also one question for you, how did you hear about the Swim platform?

    Thee, Meepeek
    @meepeek
    I searched for something like web socket or web server communication. I forgot how i end up there but just yesterday as i lookup for easier way to deal with rpc or graphql. Swim concept is quite hit what i want, if it was nodejs, i'm sure i'll dig the code.
    @ajay-gov
    Thee, Meepeek
    @meepeek
    @ajay-gov as for the 2nd answer, does that mean without enterprise feature, the test server will run in memory only and the data will reset every time it restart ?
    Ajay.Gov
    @ajay-gov
    @meepeek yes that is correct. You could write through the data you want from the Web Agent to a database or a message broker. Here is an example of how to write to a database from a Web Agent: https://github.com/swimos/cookbook/tree/master/egress_bridges
    theseus yang
    @theseusyang
    What is highest performance network transport message volumes per computing node , who test it?
    theseus yang
    @theseusyang
    @ajay-gov Can you help me to answer this question?