| /* |
| * 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.launcher; |
| |
| import java.io.Serializable; |
| |
| /** |
| * Message definitions for the launcher communication protocol. These messages must remain |
| * backwards-compatible, so that the launcher can talk to older versions of Spark that support |
| * the protocol. |
| */ |
| final class LauncherProtocol { |
| |
| /** Environment variable where the server port is stored. */ |
| static final String ENV_LAUNCHER_PORT = "_SPARK_LAUNCHER_PORT"; |
| |
| /** Environment variable where the secret for connecting back to the server is stored. */ |
| static final String ENV_LAUNCHER_SECRET = "_SPARK_LAUNCHER_SECRET"; |
| |
| /** Spark conf key used to propagate the server port for in-process launches. */ |
| static final String CONF_LAUNCHER_PORT = "spark.launcher.port"; |
| |
| /** Spark conf key used to propagate the app secret for in-process launches. */ |
| static final String CONF_LAUNCHER_SECRET = "spark.launcher.secret"; |
| |
| static class Message implements Serializable { |
| |
| } |
| |
| /** |
| * Hello message, sent from client to server. |
| */ |
| static class Hello extends Message { |
| |
| final String secret; |
| final String sparkVersion; |
| |
| Hello(String secret, String version) { |
| this.secret = secret; |
| this.sparkVersion = version; |
| } |
| |
| } |
| |
| /** |
| * SetAppId message, sent from client to server. |
| */ |
| static class SetAppId extends Message { |
| |
| final String appId; |
| |
| SetAppId(String appId) { |
| this.appId = appId; |
| } |
| |
| } |
| |
| /** |
| * SetState message, sent from client to server. |
| */ |
| static class SetState extends Message { |
| |
| final SparkAppHandle.State state; |
| |
| SetState(SparkAppHandle.State state) { |
| this.state = state; |
| } |
| |
| } |
| |
| /** |
| * Stop message, send from server to client to stop the application. |
| */ |
| static class Stop extends Message { |
| |
| } |
| |
| } |