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207+ package demo .protocol ;
208+ 209+ import java .io .IOException ;
210+ import java .util .concurrent .CompletableFuture ;
211+ 212+ /**
213+ * Modified from org.web3j.protocol.Web3jService
214+ */
215+ public interface IRpcService {
216+ 217+ String send (String request ) throws IOException ;
218+ 219+ CompletableFuture <String > sendAsync (String request );
220+ 221+ void close () throws IOException ;
222+ }
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