Use 4.0.1 version of the swim backend

Author: ajay-gov

README.md

@@ -11,7 +11,7 @@ Swim is a completely integrated solution for building scalable, end-to-end strea
 
 ## Run
 
-* [Install JDK 9+](https://www.oracle.com/technetwork/java/javase/downloads/index.html).
+* [Install JDK 11+](https://www.oracle.com/technetwork/java/javase/downloads/index.html).
   * Ensure that your `JAVA_HOME` environment variable is pointed to your Java installation location.
   * Ensure that your `PATH` includes `$JAVA_HOME`.
 

README.zh-cn.md

@@ -11,7 +11,7 @@ Swim 是建造可规模化扩展的，终端到终端的流式（streaming）应
 
 
 ## Run
-* [安装 JDK 9+](https://www.oracle.com/technetwork/java/javase/downloads/index.html).
+* [安装 JDK 11+](https://www.oracle.com/technetwork/java/javase/downloads/index.html).
   * 确保您的`JAVA_HOME`环境变量设置指向您的Java安装地址。
   * 确保您的`PATH`包含`$JAVA_HOME`。
 
@@ -23,4 +23,4 @@ Swim 是建造可规模化扩展的，终端到终端的流式（streaming）应
 
 浏览 [伺服器（server）](https://github.com/swimos/tutorial/tree/master/server)学习如何建立和处理在Swim伺服器（server）上的数据。
 
-接着，浏览 [操作界面（ui）](https://github.com/swimos/tutorial/tree/master/ui) 来学习与众不同的Swim视觉化数据处理。
+接着，浏览 [操作界面（ui）](https://github.com/swimos/tutorial/tree/master/ui) 来学习与众不同的Swim视觉化数据处理。

server/build.gradle

@@ -16,7 +16,7 @@ plugins {
 group = 'org.swimos'
 description = 'Tutorial- Web Agents'
 ext.moduleName = 'swim.tutorial'
-sourceCompatibility = 1.9
+sourceCompatibility = 11
 version = project.property('swim.version')
 mainClassName = 'swim.tutorial.TutorialPlane'
 

server/gradle.properties

@@ -1 +1 @@
-swim.version=3.11.0
+swim.version=4.0.1

server/src/main/java/swim/tutorial/DataSource.java

@@ -1,6 +1,6 @@
 package swim.tutorial;
 
-import swim.api.ref.SwimRef;
+import swim.api.ref.WarpRef;
 import swim.structure.Record;
 
 /**
@@ -9,10 +9,10 @@
  */
 class DataSource {
 
-  private final SwimRef ref;
+  private final WarpRef ref;
   private final String hostUri;
 
-  DataSource(SwimRef ref, String hostUri) {
+  DataSource(WarpRef ref, String hostUri) {
     this.ref = ref;
     this.hostUri = hostUri;
   }