content: /*
   * 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.kafka.trogdor.common;
  
  import org.apache.kafka.common.utils.Scheduler;
  import org.apache.kafka.common.utils.Utils;
  
  import com.fasterxml.jackson.databind.JsonNode;
  
  import java.io.File;
  import java.io.IOException;
  
  /**
   * Defines a cluster topology
   */
  public interface Platform {
      class Config {
          public static final String TROGDOR_AGENT_PORT = "trogdor.agent.port";
  
          public static final String TROGDOR_COORDINATOR_PORT = "trogdor.coordinator.port";
  
          public static final String TROGDOR_COORDINATOR_HEARTBEAT_MS =
              "trogdor.coordinator.heartbeat.ms";
  
          public static final int TROGDOR_COORDINATOR_HEARTBEAT_MS_DEFAULT = 60000;
  
          public static Platform parse(String curNodeName, String path) throws Exception {
              JsonNode root = JsonUtil.JSON_SERDE.readTree(new File(path));
              JsonNode platformNode = root.get("platform");
              if (platformNode == null) {
                  throw new RuntimeException("Expected to find a 'platform' field " +
                      "in the root JSON configuration object");
              }
              String platformName = platformNode.textValue();
              return Utils.newParameterizedInstance(platformName,
                  String.class, curNodeName,
                  Scheduler.class, Scheduler.SYSTEM,
                  JsonNode.class, root);
          }
      }
  
      /**
       * Get name for this platform.
       */
      String name();
  
      /**
       * Get the current node.
       */
      Node curNode();
  
      /**
       * Get the cluster topology.
       */
      Topology topology();
  
      /**
       * Get the scheduler to use.
       */
      Scheduler scheduler();
  
      /**
       * Run a command on this local node.
       *
       * Throws an exception if the command could not be run, or if the
       * command returned a non-zero error status.
       *
       * @param command   The command
       *
       * @return          The command output.
       */
      String runCommand(String[] command) throws IOException;
  }
  