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/*
 * 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.
 */

package org.apache.zeppelin.interpreter.launcher;

import java.io.IOException;

/**
 * Interface to InterpreterClient which is created by InterpreterLauncher. This is the component
 * that is used for the communication from zeppelin-server process to zeppelin interpreter
 * process and also manage the lifecycle of interpreter process.
 */
public interface InterpreterClient {

  /**
   * InterpreterGroupId that is associated with this interpreter process.
   *
   * @return
   */
  String getInterpreterGroupId();

  /**
   * InterpreterSetting name of this interpreter process.
   *
   * @return
   */
  String getInterpreterSettingName();

  /**
   * Start interpreter process.
   *
   * @param userName
   * @throws IOException
   */
  void start(String userName) throws IOException;

  /**
   * Stop interpreter process.
   *
   */
  void stop();

  /**
   * Host name of interpreter process thrift server
   *
   * @return
   */
  String getHost();

  /**
   * Port of interpreter process thrift server
   *
   * @return
   */
  int getPort();

  /**
   * The Interpreter is alive. It's different from `running` as it shows process status only.
   * @return true if interpreter process is running. Otherwise, false
   */
  boolean isAlive();

  /**
   * The interpreter is working as expected. This means the interpreter can communicate with server
   * @return true if interpreter is working correctly. Otherwise, false
   */
  boolean isRunning();

  /**
   * Return true if recovering successfully, otherwise return false.
   *
   * @return
   */
  boolean recover();
}