Feature - StreamMessageId.LAST option added.

redisson/src/main/java/org/redisson/api/StreamMessageId.java

@@ -58,6 +58,13 @@ public class StreamMessageId {
      */
     public static final StreamMessageId NEWEST = new StreamMessageId(-1);
 
+    /**
+     * Defines id to receive Stream entries since the last message.
+     * <p>
+     * Used in {@link RStream#read}, {@link RStream#createGroup} methods
+     */
+    public static final StreamMessageId LAST = new StreamMessageId(-1);
+
     /**
      * Defines id to receive all Stream entries.
      * <p>
@@ -135,6 +142,9 @@ public class StreamMessageId {
         if (this == NEVER_DELIVERED) {
             return ">";
         }
+        if (this == LAST) {
+            return "+";
+        }
         if (this == NEWEST) {
             return "$";
         }