Github user andrewor14 commented on a diff in the pull request: https://github.com/apache/spark/pull/4216#discussion_r23812998 --- Diff: core/src/main/scala/org/apache/spark/deploy/rest/SubmitRestProtocolMessage.scala --- @@ -0,0 +1,201 @@ +/* + * 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.spark.deploy.rest + +import scala.collection.Map +import scala.collection.JavaConversions._ + +import org.json4s.jackson.JsonMethods._ +import org.json4s.JsonAST._ + +import org.apache.spark.Logging +import org.apache.spark.util.Utils + +/** + * A general message exchanged in the stable application submission REST protocol. + * + * The message is represented by a set of fields in the form of key value pairs. + * Each message must contain an ACTION field, which fully specifies the type of the message. + * For compatibility with older versions of Spark, existing fields must not be removed or + * modified, though new fields can be added as necessary. + */ +private[spark] abstract class SubmitRestProtocolMessage( + action: SubmitRestProtocolAction, + actionField: ActionField, + requiredFields: Seq[SubmitRestProtocolField]) { + + // Maintain the insert order for converting to JSON later + private val fields = new java.util.LinkedHashMap[SubmitRestProtocolField, String] + val className = Utils.getFormattedClassName(this) + + // Set the action field + fields.put(actionField, action.toString) + + /** Return all fields currently set in this message. */ + def getFields: Map[SubmitRestProtocolField, String] = fields.toMap --- End diff -- By the way as of the latest commit I went with the jackson approach, which simplifies the code considerably as expected since we no longer have to rely on all the scala class hierarchy magic. Please have a look.
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