content: /*
   * Copyright 2023 Ant Group
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *     http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.alipay.antchain.bridge.plugins.spi.bbc.core.read;
  
  /**
   * Through {@code ISDPReader}, you can query the state of the SDPContract.
   */
  public interface ISDPReader {
  
      /**
       * Method {@code querySDPMessageSeq} query the sequence number
       * of ordered message for the channel identified by the
       * parameters {@code senderDomain}, {@code fromAddress}, {@code receiverDomain}
       * and {@code toAddress}.
       *
       * @param senderDomain   blockchain domain where sender from
       * @param fromAddress    sender address in 32B hex
       * @param receiverDomain blockchain domain where receiver from
       * @param toAddress      receiver address in 32B hex
       * @return long sequence number start from zero.
       */
      long querySDPMessageSeq(String senderDomain, String fromAddress, String receiverDomain, String toAddress);
  }
  