Merge pull request #142 from NipunaMadhushan/add-get-tag-api

Include addTag and getTagValue APIs

Author: anuruddhal

ballerina/natives.bal

@@ -42,6 +42,25 @@ public isolated function startSpan(string spanName, map<string>? tags = (), int
     name: "startSpan"
 } external;
 
+# Add a key-value pair as a tag to the root.
+#
+# + tagKey - Key of the tag
+# + tagValue - Value of the tag
+# + return - An error if adding the tag failed; otherwise null
+public isolated function addTag(string tagKey, string tagValue) returns error? = @java:Method {
+    'class: "io.ballerina.stdlib.observe.nativeimpl.AddTag",
+    name: "addTag"
+} external;
+
+# Get the value of a given key of a tag.
+#
+# + tagKey - Key of the tag
+# + return - The value of the tag if present; otherwise null
+public isolated function getTagValue(string tagKey) returns string? = @java:Method {
+    'class: "io.ballerina.stdlib.observe.nativeimpl.GetTagValue",
+    name: "getTagValue"
+} external;
+
 # Add a key value pair as a tag to the span.
 #
 # + spanId - Id of span to which the tags should be added or -1 to add tags to the current active span

gradle.properties

@@ -14,8 +14,8 @@
 
 org.gradle.caching=true
 group=io.ballerina.stdlib
-version=1.5.1-SNAPSHOT
-ballerinaLangVersion=2201.12.0
+version=1.6.0-SNAPSHOT
+ballerinaLangVersion=2201.13.0-20251016-073200-0d348172
 
 spotbugsPluginVersion=6.0.18
 shadowJarPluginVersion=8.1.1

native/src/main/java/io/ballerina/stdlib/observe/nativeimpl/AddTag.java

@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2025, WSO2 LLC. (http://wso2.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.ballerina.stdlib.observe.nativeimpl;
+
+import io.ballerina.runtime.api.values.BString;
+import io.ballerina.runtime.observability.ObserveUtils;
+
+public class AddTag {
+    public static void addTag(BString tagKey, BString tagValue) {
+        if (ObserveUtils.isObservabilityEnabled()) {
+            ObserveUtils.addTag(tagKey.getValue(), tagValue.getValue());
+        }
+    }
+}

native/src/main/java/io/ballerina/stdlib/observe/nativeimpl/GetTagValue.java

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2025, WSO2 LLC. (http://wso2.com).
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.ballerina.stdlib.observe.nativeimpl;
+
+import io.ballerina.runtime.api.Environment;
+import io.ballerina.runtime.api.utils.StringUtils;
+import io.ballerina.runtime.api.values.BString;
+import io.ballerina.runtime.observability.ObserveUtils;
+import io.ballerina.runtime.observability.ObserverContext;
+import io.ballerina.runtime.observability.metrics.Tag;
+
+public class GetTagValue {
+    public static Object getTagValue(Environment env, BString tagKey) {
+        if (ObserveUtils.isObservabilityEnabled()) {
+            ObserverContext observerContext = ObserveUtils.getObserverContextOfCurrentFrame(env);
+            if (observerContext == null) {
+                return null;
+            }
+            Tag tag = observerContext.getTag(tagKey.getValue());
+            if (tag != null) {
+                return StringUtils.fromString(tag.getValue());
+            }
+            return null;
+        }
+        return null;
+    }
+}