1 files changed, 15 insertions, 0 deletions
diff --git a/src/android/net/util/DataStallUtils.java b/src/android/net/util/DataStallUtils.java
index 5787879..3391a71 100644
--- a/src/android/net/util/DataStallUtils.java
+++ b/src/android/net/util/DataStallUtils.java
@@ -16,15 +16,30 @@
 
 package android.net.util;
 
+import android.annotation.IntDef;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
 /**
  * Collection of utilities for data stall.
  */
 public class DataStallUtils {
+    public static final int DATA_STALL_EVALUATION_TYPE_NONE = 0;
     /** Detect data stall using dns timeout counts. */
     public static final int DATA_STALL_EVALUATION_TYPE_DNS = 1 << 0;
     /** Detect data stall using tcp connection fail rate. */
     public static final int DATA_STALL_EVALUATION_TYPE_TCP = 1 << 1;
 
+    @IntDef(prefix = { "DATA_STALL_EVALUATION_TYPE_" }, value = {
+        DATA_STALL_EVALUATION_TYPE_NONE,
+        DATA_STALL_EVALUATION_TYPE_DNS,
+        DATA_STALL_EVALUATION_TYPE_TCP,
+    })
+    @Retention(RetentionPolicy.SOURCE)
+    public @interface EvaluationType {
+    }
+
     // Default configuration values for data stall detection.
     public static final int DEFAULT_CONSECUTIVE_DNS_TIMEOUT_THRESHOLD = 5;
     public static final int DEFAULT_DATA_STALL_MIN_EVALUATE_TIME_MS = 60 * 1000;