com.pubnub.internal.managers.DuplicationManager.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.managers

import com.pubnub.api.v2.BasePNConfiguration
import com.pubnub.internal.models.server.SubscribeMessage

internal class DuplicationManager(private val config: BasePNConfiguration) {
    private val hashHistory: ArrayList = ArrayList()

    private fun getKey(message: SubscribeMessage) =
        with(message) {
            "${publishMetaData?.publishTimetoken}-${payload.hashCode()}"
        }

    @Synchronized
    fun isDuplicate(message: SubscribeMessage) = hashHistory.contains(getKey(message))

    @Synchronized
    fun addEntry(message: SubscribeMessage) {
        if (hashHistory.size >= config.maximumMessagesCacheSize) {
            hashHistory.removeAt(0)
        }
        hashHistory.add(getKey(message))
    }

    @Synchronized
    fun clearHistory() = hashHistory.clear()
}