Added docker file

Author: bipoool

examples/chatroom-java/.gitignore

@@ -4,7 +4,7 @@ target/
 !**/src/test/**/target/
 
 ### IntelliJ IDEA ###
-# .idea/*
+.idea/*
 *.iws
 *.iml
 *.ipr

examples/chatroom-java/Dockerfile

@@ -0,0 +1,9 @@
+# Use OpenJDK 21 base image
+FROM openjdk:21-jdk
+
+WORKDIR /app
+
+COPY target/chatroom.jar .
+
+ENTRYPOINT ["java", "-jar", "chatroom.jar"]
+CMD []

examples/chatroom-java/README.md

@@ -30,6 +30,22 @@ java -jar target/chatroom.jar <username1>
 java -jar target/chatroom.jar <username2>
 ```
 
+### Using Docker
+
+To build and run the Container:
+
+```bash
+# Step 1: Build the jar
+./mvnw clean install
+
+# Step 2: Run DiceDB docker container first
+docker-compose up -d dicedb
+
+# Step 3: Run Container for each chatroom session
+docker-compose run chatroom username1
+docker-compose run chatroom username2
+```
+
 ### Using IntelliJ (Not in windows)
 
 ```text

examples/chatroom-java/docker-compose.yml

@@ -0,0 +1,21 @@
+version: '3.8'
+
+services:
+  dicedb:
+    image: dicedb/dicedb:latest
+    container_name: dicedb
+    ports:
+      - "7379:7379"
+
+  chatroom:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: chatroom-app
+    depends_on:
+      - dicedb
+    environment:
+      - DICEDB_HOST=dicedb
+      - DICEDB_PORT=7379
+    stdin_open: true
+    tty: true

examples/chatroom-java/src/main/java/me/vipulgupta/dice/example/DiceDbChatBackend.java

@@ -13,7 +13,9 @@ class DiceDbChatBackend {
   String username;
 
   DiceDbChatBackend(String username) throws DiceDbException, InterruptedException {
-    this.diceDbManager = new DiceDbManager("localhost", 7379, 2, 2);
+    String host = System.getenv("DICEDB_HOST") == null ? "localhost" : System.getenv("DICEDB_HOST");
+    int port = System.getenv("DICEDB_PORT") == null ? 7379 : Integer.parseInt(System.getenv("DICEDB_PORT"));
+    this.diceDbManager = new DiceDbManager(host, port, 2, 2);
     this.username = username;
   }