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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.rpc.provider;

import com.onehilltech.promises.Promise;
import org.polkadot.common.EventEmitter;

import java.util.List;

public interface IProvider {


    @FunctionalInterface
    interface CallbackHandler {

        /**
         * Performs this operation on the given arguments.
         *
         * @param t the first input argument
         * @param u the second input argument
         */
        void callback(T t, U u);
    }


    class SubscriptionHandler {
        CallbackHandler callBack;
        String type;

        public SubscriptionHandler() {
        }

        public SubscriptionHandler(CallbackHandler callBack, String type) {
            this.callBack = callBack;
            this.type = type;
        }

        public CallbackHandler getCallBack() {
            return callBack;
        }

        public void setCallBack(CallbackHandler callBack) {
            this.callBack = callBack;
        }

        public String getType() {
            return type;
        }

        public void setType(String type) {
            this.type = type;
        }
    }


    @FunctionalInterface
    interface ProviderInterfaceEmitCb {
        void handler(Object... value);
    }


    //export type ProviderInterface$Emitted = 'connected' | 'disconnected' | 'error';
    //export type RpcRxInterface$Events = ProviderInterface$Emitted;
    //export type ApiInterface$Events = RpcRxInterface$Events | 'ready';

    enum ProviderInterfaceEmitted implements EventEmitter.EventType {
        // 'connected' | 'disconnected' | 'error';
        ready,
        connected,
        disconnected,
        error
    }

    boolean isHasSubscriptions();

    IProvider clone();

    void disconnect();

    boolean isConnected();

    //TODO 2019-04-26 15:09
    void on(ProviderInterfaceEmitted emitted, EventEmitter.EventListener cb);

    Promise send(String method, List