import org.apache.hadoop.tracing.TraceAdminPB.ListSpanReceiversResponseProto; //导入依赖的package包/类
@Override
public SpanReceiverInfo[] listSpanReceivers() throws IOException {
  ArrayList<SpanReceiverInfo> infos = new ArrayList<SpanReceiverInfo>(1);
  try {
    ListSpanReceiversRequestProto req =
        ListSpanReceiversRequestProto.newBuilder().build();
    ListSpanReceiversResponseProto resp =
        rpcProxy.listSpanReceivers(null, req);
    for (SpanReceiverListInfo info : resp.getDescriptionsList()) {
      infos.add(new SpanReceiverInfo(info.getId(), info.getClassName()));
    }
  } catch (ServiceException e) {
    throw ProtobufHelper.getRemoteException(e);
  }
  return infos.toArray(new SpanReceiverInfo[infos.size()]);
}
 

import org.apache.hadoop.tracing.TraceAdminPB.ListSpanReceiversResponseProto; //导入依赖的package包/类
@Override
public ListSpanReceiversResponseProto listSpanReceivers(
    RpcController controller, ListSpanReceiversRequestProto req)
        throws ServiceException {
  try {
    SpanReceiverInfo[] descs = server.listSpanReceivers();
    ListSpanReceiversResponseProto.Builder bld =
        ListSpanReceiversResponseProto.newBuilder();
    for (int i = 0; i < descs.length; ++i) {
      bld.addDescriptions(TraceAdminPB.SpanReceiverListInfo.newBuilder().
            setId(descs[i].getId()).
            setClassName(descs[i].getClassName()).build());
    }
    return bld.build();
  } catch (IOException e) {
    throw new ServiceException(e);
  }
}