read AWS region from CloudFormation via environment variable

Author: Michael Wunderlich

.ebextensions/env.config

@@ -0,0 +1,3 @@
+option_settings:
+  aws:elasticbeanstalk:application:environment:
+    AWS_REGION: '`{"Ref" : "AWS::Region"}`'

src/main/java/scorekeep/Constants.java

@@ -7,5 +7,4 @@ public class Constants {
   public static final String USER_TABLE = "scorekeep-user";
   public static final String MOVE_TABLE = "scorekeep-move";
   public static final String STATE_TABLE = "scorekeep-state";
-  public static final Regions REGION = Regions.US_EAST_1;
 }

src/main/java/scorekeep/GameModel.java

@@ -27,7 +27,7 @@
 public class GameModel {
   /** AWS SDK credentials. */
   private AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
-        .withRegion(Constants.REGION)
+        .withRegion(Regions.fromName(System.getenv("AWS_REGION")))
         .build();
   private DynamoDBMapper mapper = new DynamoDBMapper(client);
   private SessionModel sessionModel = new SessionModel();

src/main/java/scorekeep/MoveModel.java

@@ -27,7 +27,7 @@
 public class MoveModel {
   /** AWS SDK credentials. */
   private AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
-        .withRegion(Constants.REGION)
+        .withRegion(Regions.fromName(System.getenv("AWS_REGION")))
         .build();
   private DynamoDBMapper mapper = new DynamoDBMapper(client);
   private SessionModel sessionModel = new SessionModel();

src/main/java/scorekeep/SessionModel.java

@@ -17,7 +17,7 @@ public class SessionModel {
 
   /** AWS SDK credentials. */
   private AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
-        .withRegion(Constants.REGION)
+        .withRegion(Regions.fromName(System.getenv("AWS_REGION")))
         .build();
   private DynamoDBMapper mapper = new DynamoDBMapper(client);
 

src/main/java/scorekeep/StateModel.java

@@ -31,7 +31,7 @@
 public class StateModel {
   /** AWS SDK credentials. */
   private AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
-        .withRegion(Constants.REGION)
+        .withRegion(Regions.fromName(System.getenv("AWS_REGION")))
         .build();
   private DynamoDBMapper mapper = new DynamoDBMapper(client);
   private SessionModel sessionModel = new SessionModel();

src/main/java/scorekeep/UserModel.java

@@ -16,7 +16,7 @@
 public class UserModel {
   /** AWS SDK credentials. */
   private AmazonDynamoDB client = AmazonDynamoDBClientBuilder.standard()
-        .withRegion(Constants.REGION)
+        .withRegion(Regions.fromName(System.getenv("AWS_REGION")))
         .build();
   private DynamoDBMapper mapper = new DynamoDBMapper(client);