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public class CSAppLifecycleObserver implements DefaultLifecycleObserver {
    private final SharedPreferences sharedPreferences;
    private final Random random = new Random();

    public CSAppLifecycleObserver(@NonNull Context appContext) {
        sharedPreferences = appContext.getSharedPreferences(
                "CSAppLifecycleObserver",
                MODE_PRIVATE
        );
    }

    @Override
    public void onResume(@NonNull LifecycleOwner owner) {
        DefaultLifecycleObserver.super.onResume(owner);
        sendCSMatchingKeyIfNeeded();
    }

    public void sendCSMatchingKeyIfNeeded() {
        String csMatchingKeyTimestampKey = "csMatchingKey_ts";
        int csMatchingKeyValidityMs = 1800000; // 30 minutes

        long currentTimestamp = new Date().getTime();
        long csMatchingKeyIsPreviousTimestamp = sharedPreferences.getLong(csMatchingKeyTimestampKey, 0);

        if ((currentTimestamp - csMatchingKeyIsPreviousTimestamp) <= csMatchingKeyValidityMs) {
            return;
        }

        sharedPreferences.edit().putLong(csMatchingKeyTimestampKey, currentTimestamp).apply();

        String csMatchingKey = "csMatchingKey";
        String csMatchingKeyValue = random.nextDouble() + "_" + currentTimestamp;

        Contentsquare.send(csMatchingKey, csMatchingKeyValue);
        MobileCore.trackState(csMatchingKey + "_state", Collections.singletonMap(csMatchingKey, csMatchingKeyValue));
    }
}

class CSAppLifecycleObserver(appContext: Context) : DefaultLifecycleObserver {
    private val sharedPreferences = appContext.getSharedPreferences(
        "CSAppLifecycleObserver",
        Context.MODE_PRIVATE
    )
    private val random = Random()

    override fun onResume(owner: LifecycleOwner) {
        super.onResume(owner)
        sendCSMatchingKeyIfNeeded()
    }

    private fun sendCSMatchingKeyIfNeeded() {
        val csMatchingKeyTimestampKey = "csMatchingKey_ts"
        val csMatchingKeyValidityMs = 1800000 // 30 minutes

        val currentTimestamp = Date().time
        val csMatchingKeyIsPreviousTimestamp = sharedPreferences.getLong(csMatchingKeyTimestampKey, 0)

        if (currentTimestamp - csMatchingKeyIsPreviousTimestamp <= csMatchingKeyValidityMs) {
            return
        }
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        sharedPreferences.edit().putLong(csMatchingKeyTimestampKey, currentTimestamp).apply()

        val csMatchingKey = "csMatchingKey"
        val csMatchingKeyValue = random.nextDouble().toString() + "_" + currentTimestamp

        Contentsquare.send(csMatchingKey, csMatchingKeyValue)
        MobileCore.trackState("${csMatchingKey}_state", Collections.singletonMap(csMatchingKey, csMatchingKeyValue))
    }
}