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const Dnode = require('dnode')
const ObservableStore = require('./index')
const endOfStream = require('end-of-stream')
//
// HostStore
//
// plays host to many RemoteStores and sends its state over a stream
//
class HostStore extends ObservableStore {
constructor (initState, opts) {
super(initState)
this._opts = opts || {}
}
createStream () {
const self = this
// setup remotely exposed api
let remoteApi = {}
if (!self._opts.readOnly) {
remoteApi.put = (newState) => self.put(newState)
}
// listen for connection to remote
const dnode = Dnode(remoteApi)
dnode.on('remote', (remote) => {
// setup update subscription lifecycle
const updateHandler = (state) => remote.put(state)
self._onConnect(updateHandler)
endOfStream(dnode, () => self._onDisconnect(updateHandler))
})
return dnode
}
_onConnect (updateHandler) {
// subscribe to updates
this.subscribe(updateHandler)
// send state immediately
updateHandler(this.get())
}
_onDisconnect (updateHandler) {
// unsubscribe to updates
this.unsubscribe(updateHandler)
}
}
module.exports = HostStore
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