com.pubnub.internal.eventengine.State.kt Maven / Gradle / Ivy

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package com.pubnub.internal.eventengine

import org.slf4j.LoggerFactory

internal interface State> {
    companion object {
        internal val logger = LoggerFactory.getLogger(this::class.java)
    }

    fun onEntry(): Set = setOf()

    fun onExit(): Set = setOf()

    fun transition(event: Ev): Pair>
}

internal fun > S.noTransition(): Pair> = Pair(this, emptySet())

internal fun > S.transitionTo(
    state: S,
    vararg invocations: Ei,
): Pair> {
    State.logger.trace(
        "Transitioning from ${this::class.simpleName} to ${state::class.simpleName} with ${invocations.size} " +
            "invocations: ${invocations.joinToString(", ")}",
    )

    val effectInvocations = this.onExit() + invocations + state.onEntry()
    return Pair(state, effectInvocations)
}