com.pubnub.internal.v2.subscription.BaseSubscriptionSetImpl.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.internal.v2.subscription

import com.pubnub.api.callbacks.Listener
import com.pubnub.api.v2.callbacks.BaseEventListener
import com.pubnub.api.v2.subscriptions.BaseSubscription
import com.pubnub.api.v2.subscriptions.BaseSubscriptionSet
import com.pubnub.api.v2.subscriptions.SubscriptionCursor
import com.pubnub.internal.PubNubCore
import com.pubnub.internal.managers.AnnouncementCallback
import com.pubnub.internal.managers.AnnouncementEnvelope
import com.pubnub.internal.v2.callbacks.EventEmitterImpl
import com.pubnub.internal.v2.callbacks.EventListenerCore
import java.util.concurrent.CopyOnWriteArraySet

private const val ERROR_SUBSCRIPTION_WRONG_CLASS =
    "Only Subscriptions returned from objects created" +
        "through the PubNub instance and their methods, such as channel(...).subscriptions() are supported."
private const val ERROR_WRONG_PUBNUB_INSTANCE =
    "Adding Subscriptions from another PubNub instance to a SubscriptionSet is not allowed."

abstract class BaseSubscriptionSetImpl>(
    private val pubnub: PubNubCore,
    initialSubscriptions: Set> = emptySet(),
) : BaseSubscriptionSet {
    private val _subscriptions: CopyOnWriteArraySet> = CopyOnWriteArraySet()
    override val subscriptions: Set_{get() = _subscriptions.toSet() as Set_{protected val eventEmitter = EventEmitterImpl(AnnouncementCallback.Phase.SET, ::accepts)

    private fun accepts(envelope: AnnouncementEnvelope<*>) = subscriptions.any { subscription -> subscription in envelope.acceptedBy }

    init {
        require(initialSubscriptions.all { it.pubnub == pubnub }) { ERROR_WRONG_PUBNUB_INSTANCE }
        _subscriptions.addAll(initialSubscriptions)
        pubnub.listenerManager.addAnnouncementCallback(eventEmitter)
    }

    override fun add(subscription: Sub) { // todo check this
        require(subscription is BaseSubscriptionImpl<*>) { ERROR_SUBSCRIPTION_WRONG_CLASS }
        require(subscription.pubnub == pubnub) { ERROR_WRONG_PUBNUB_INSTANCE }
        _subscriptions.add(subscription as BaseSubscriptionImpl)
    }

    override fun remove(subscription: Sub) {
        _subscriptions.remove(subscription as BaseSubscriptionImpl<*>)
    }

    override fun subscribe(cursor: SubscriptionCursor) {
        _subscriptions.forEach { it.onSubscriptionActive(cursor) }
        pubnub.subscribe(*_subscriptions.toTypedArray(), cursor = cursor)
    }

    override fun unsubscribe() {
        _subscriptions.forEach { it.onSubscriptionInactive() }
        pubnub.unsubscribe(*_subscriptions.toTypedArray())
    }

    override fun close() {
        unsubscribe()
        pubnub.listenerManager.removeAnnouncementCallback(eventEmitter)
    }

    protected fun addListener(listener: EventListenerCore) {
        eventEmitter.addListener(listener)
    }

    override fun removeListener(listener: Listener) {
        eventEmitter.removeListener(listener)
    }

    override fun removeAllListeners() {
        eventEmitter.removeAllListeners()
    }
}}}