Update cache configurations to allow null in the default setting

ballerina/Ballerina.toml

@@ -2,7 +2,7 @@
 distribution = "2201.12.0"
 org = "ballerinax"
 name = "ai.memory.mssql"
-version = "1.0.0"
+version = "1.0.1"
 license = ["Apache-2.0"]
 authors = ["Ballerina"]
 keywords = ["ai", "agent", "memory"]

ballerina/Dependencies.toml

@@ -10,7 +10,7 @@ distribution-version = "2201.12.0"
 [[package]]
 org = "ballerina"
 name = "ai"
-version = "1.6.0"
+version = "1.7.0"
 dependencies = [
 	{org = "ballerina", name = "constraint"},
 	{org = "ballerina", name = "data.jsondata"},
@@ -26,14 +26,16 @@ dependencies = [
 	{org = "ballerina", name = "math.vector"},
 	{org = "ballerina", name = "mcp"},
 	{org = "ballerina", name = "mime"},
+	{org = "ballerina", name = "observe"},
 	{org = "ballerina", name = "time"},
 	{org = "ballerina", name = "url"},
 	{org = "ballerina", name = "uuid"},
 	{org = "ballerina", name = "yaml"}
 ]
 modules = [
 	{org = "ballerina", packageName = "ai", moduleName = "ai"},
-	{org = "ballerina", packageName = "ai", moduleName = "ai.intelligence"}
+	{org = "ballerina", packageName = "ai", moduleName = "ai.intelligence"},
+	{org = "ballerina", packageName = "ai", moduleName = "ai.observe"}
 ]
 
 [[package]]
@@ -268,7 +270,7 @@ version = "1.2.0"
 [[package]]
 org = "ballerina"
 name = "mcp"
-version = "1.0.1"
+version = "1.0.2"
 dependencies = [
 	{org = "ballerina", name = "http"},
 	{org = "ballerina", name = "jballerina.java"},
@@ -302,7 +304,7 @@ dependencies = [
 [[package]]
 org = "ballerina"
 name = "observe"
-version = "1.5.1"
+version = "1.6.0"
 dependencies = [
 	{org = "ballerina", name = "jballerina.java"}
 ]
@@ -357,15 +359,15 @@ modules = [
 [[package]]
 org = "ballerina"
 name = "time"
-version = "2.7.0"
+version = "2.8.0"
 dependencies = [
 	{org = "ballerina", name = "jballerina.java"}
 ]
 
 [[package]]
 org = "ballerina"
 name = "url"
-version = "2.6.0"
+version = "2.6.1"
 dependencies = [
 	{org = "ballerina", name = "jballerina.java"}
 ]
@@ -405,7 +407,7 @@ dependencies = [
 [[package]]
 org = "ballerinax"
 name = "ai.memory.mssql"
-version = "1.0.0"
+version = "1.0.1"
 dependencies = [
 	{org = "ballerina", name = "ai"},
 	{org = "ballerina", name = "cache"},

ballerina/store.bal

@@ -55,7 +55,7 @@ public isolated class ShortTermMemoryStore {
     *ai:ShortTermMemoryStore;
 
     private final mssql:Client dbClient;
-    private final cache:Cache cache;
+    private final cache:Cache? cache;
     private final int maxMessagesPerKey;
 
     # Initializes the MS SQL-backed short-term memory store.
@@ -66,7 +66,7 @@ public isolated class ShortTermMemoryStore {
     # + returns - An error if the initialization fails
     public isolated function init(mssql:Client|DatabaseConfiguration mssqlClient, 
                                   int maxMessagesPerKey = 20,
-                                  cache:CacheConfig cacheConfig = {capacity: 20}) returns Error? {
+                                  cache:CacheConfig? cacheConfig = ()) returns Error? {
         if mssqlClient is mssql:Client {
             self.dbClient = mssqlClient;
         } else {
@@ -77,7 +77,7 @@ public isolated class ShortTermMemoryStore {
             self.dbClient = initializedClient;
         }
         self.maxMessagesPerKey = maxMessagesPerKey;
-        self.cache = new (cacheConfig);
+        self.cache = cacheConfig is () ? () : new (cacheConfig);
         return self.initializeDatabase();
     }
 
@@ -396,8 +396,9 @@ public isolated class ShortTermMemoryStore {
 
             final ai:ChatInteractiveMessage[] & readonly immutableInteractiveMessages = interactiveMessages.cloneReadOnly();
             lock {
-                if !self.cache.hasKey(key) {
-                    check self.cache.put(
+                cache:Cache? cache = self.cache;
+                if cache !is () && !cache.hasKey(key) {
+                    check cache.put(
                         key, <CachedMessages> {systemMessage, interactiveMessages: [...immutableInteractiveMessages]});
                 }
             }
@@ -413,8 +414,9 @@ public isolated class ShortTermMemoryStore {
 
     private isolated function removeCacheEntry(string key) {
         lock {
-            if self.cache.hasKey(key) {
-                cache:Error? err = self.cache.invalidate(key);
+            cache:Cache? cache = self.cache;
+            if cache !is () && cache.hasKey(key) {
+                cache:Error? err = cache.invalidate(key);
                 if err is cache:Error {
                     // Ignore, as this is for non-existent key
                 }
@@ -424,11 +426,12 @@ public isolated class ShortTermMemoryStore {
 
     private isolated function getCacheEntry(string key) returns CachedMessages? {
         lock {
-            if !self.cache.hasKey(key) {
+            cache:Cache? cache = self.cache;
+            if cache is () || !cache.hasKey(key) {
                 return ();
             }
 
-            any|cache:Error cacheEntry = self.cache.get(key);
+            any|cache:Error cacheEntry = cache.get(key);
             if cacheEntry is cache:Error {
                 return ();
             }