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Java Polkadot API, this is a clone of https://github.com/polkadot-java/api

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package org.polkadot.direct;

import com.onehilltech.promises.Promise;

public interface IRpcFunction extends IFunction {

    interface Unsubscribe {
        T unsubscribe();
    }

    interface SubscribeCallback {
        void callback(T t);
    }

    Promise invoke(Object... params);

    default boolean isSubscribe() {
        return false;
    }

    default Promise unsubscribe(int subscriptionId) {
        //TODO 2019-06-11 11:00
        throw new UnsupportedOperationException();
    }

}