Store - Freechains

Interprets a chain as a dataset -- a map of maps -- from a list of posted triples.

A store is associated with an existing chain and port to connect. It provides the dataset data a mutable list of callbacks cbs that are called when new data is posted, and a function store to update the store.

class Store (chain: String, port: Int) {
    val data : MutableMap<String,MutableMap<String,String>>
    val cbs  : MutableList<(String,String,String)->Unit>
    fun store (v1: String, v2: String, v3: String)
}

• Instantiate a store from an existing chain:

val s = Store("#data", 8330)    // port to connect

• Post a triple in the store:

s.store("v1","v2","v3")

• Read the store:

assert(s.data["v1"]!!["v2"]!! == "v3")

• Remove an item with the special symbol "REM":

s.store("v1","v2","REM")
assert(!s.data["v1"]!!.containsKey("v2"))