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.
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
- You have a Customer Java object with
firstName,lastName,dob, andcontactInfo - The type of
contactInfoisContactInfo[]
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.
@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());
});
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
- How to scale out ? Can I run a dynamic cluster ?
- how to backup and administrate ? can I store a file as well ?
- 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 ?
- How the cache and security works ? should let the client contact swim server directly or through proxy ?
- How about authorize and access control ?
@meepeek Good questions.
- 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
- 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.
- Ideally it's best to program all the server side logic in java using the SwimOS platform
- 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
- 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?
