com.pubnub.api.eventengine.EventEngine.kt Maven / Gradle / Ivy

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PubNub is a cross-platform client-to-client (1:1 and 1:many) push service in the cloud, capable of broadcasting real-time messages to millions of web and mobile clients simultaneously, in less than a quarter second!

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package com.pubnub.api.eventengine

import org.slf4j.LoggerFactory
import java.util.concurrent.ExecutorService
import java.util.concurrent.Executors

internal class EventEngine>(
    private val effectSink: Sink,
    private val eventSource: Source,
    private var currentState: S,
    private val executorService: ExecutorService = Executors.newSingleThreadExecutor()
) {
    private val log = LoggerFactory.getLogger(EventEngine::class.java)

    fun start() {
        executorService.submit {
            try {
                while (true) {
                    val event = eventSource.take()
                    performTransitionAndEmitEffects(event)
                }
            } catch (e: InterruptedException) {
                Thread.currentThread().interrupt()
            }
        }
    }

    fun stop() {
        executorService.shutdownNow()
    }

    internal fun performTransitionAndEmitEffects(event: Ev) {
        log.trace("Curren state is: ${currentState::class.simpleName} ; event to be handled is: $event ")
        val (newState, invocations) = transition(currentState, event)
        currentState = newState
        invocations.forEach { invocation -> effectSink.add(invocation) }
    }
}