Ensure RedisHttpSessionConfiguration handles events for configured database

At present, RedisHttpSessionConfiguration doesn't take into account database index when handlng events. In situations where multiple apps use Spring Session with same Redis instance, but different database, this results in invalid session events.

This commits improves event handling in RedisHttpSessionConfiguration to ensure currently used database is considered.

Closes gh-1128

spring-session-data-redis/src/integration-test/java/org/springframework/session/data/redis/RedisOperationsSessionRepositoryITests.java

@@ -16,6 +16,7 @@
 
 package org.springframework.session.data.redis;
 
+import java.nio.charset.StandardCharsets;
 import java.util.Map;
 import java.util.UUID;
 
@@ -190,9 +191,10 @@ public class RedisOperationsSessionRepositoryITests extends AbstractRedisITests
 
 		String body = "RedisOperationsSessionRepositoryITests:sessions:expires:"
 				+ toSave.getId();
-		String channel = ":expired";
-		DefaultMessage message = new DefaultMessage(channel.getBytes("UTF-8"),
-				body.getBytes("UTF-8"));
+		String channel = "__keyevent@0__:expired";
+		DefaultMessage message = new DefaultMessage(
+				channel.getBytes(StandardCharsets.UTF_8),
+				body.getBytes(StandardCharsets.UTF_8));
 		byte[] pattern = new byte[] {};
 		this.repository.onMessage(message, pattern);
 
@@ -358,9 +360,10 @@ public class RedisOperationsSessionRepositoryITests extends AbstractRedisITests
 
 		String body = "RedisOperationsSessionRepositoryITests:sessions:expires:"
 				+ toSave.getId();
-		String channel = ":expired";
-		DefaultMessage message = new DefaultMessage(channel.getBytes("UTF-8"),
-				body.getBytes("UTF-8"));
+		String channel = "__keyevent@0__:expired";
+		DefaultMessage message = new DefaultMessage(
+				channel.getBytes(StandardCharsets.UTF_8),
+				body.getBytes(StandardCharsets.UTF_8));
 		byte[] pattern = new byte[] {};
 		this.repository.onMessage(message, pattern);