Github user hbdeshmukh commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/232#discussion_r112249411
--- Diff: cli/IOInterface.hpp ---
@@ -0,0 +1,61 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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.
+ **/
+
+#ifndef QUICKSTEP_CLI_IO_INTERFACE_HPP_
+#define QUICKSTEP_CLI_IO_INTERFACE_HPP_
+
+#include <string>
+
+/**
+ * Virtual base defines a generic, file-based interface around IO.
+ */
+class IOInterface {
+ public:
+ IOInterface() {}
+
+ /**
+ * @return A file handle for standard output.
+ */
+ virtual FILE* out() = 0;
+
+ /**
+ * @return A file handle for error output.
+ */
+ virtual FILE* err() = 0;
+
+ /**
+ * Requests a complete SQL command. This call may block until user input
is given.
+ * @note When the command is complete, commandComplete() should be
called so that certain implementations can clean
+ * up state related to sending the command.
+ * @return A string containing a quickstep command.
+ */
+ virtual std::string nextCommand() = 0;
+
+ /**
+ * Notifies the IO system that the previously acquired command is
complete.
+ */
+ virtual void commandComplete() {}
+
+ /**
+ * Notifies the IO system that quickstep is shutting down.
--- End diff --
Missing the @ brief annotation
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