Make operation counts monotonically increase.

Bug: 5585704
Change-Id: I5247a68acdb209a4ef0f5aac18944595c295e6ca

Author: jsharkey

core/java/android/net/NetworkStats.java

@@ -165,6 +165,17 @@ public void writeToParcel(Parcel dest, int flags) {
         dest.writeLongArray(operations);
     }
 
+    @Override
+    public NetworkStats clone() {
+        final NetworkStats clone = new NetworkStats(elapsedRealtime, size);
+        NetworkStats.Entry entry = null;
+        for (int i = 0; i < size; i++) {
+            entry = getValues(i, entry);
+            clone.addValues(entry);
+        }
+        return clone;
+    }
+
     // @VisibleForTesting
     public NetworkStats addIfaceValues(
             String iface, long rxBytes, long rxPackets, long txBytes, long txPackets) {

core/tests/coretests/src/android/net/NetworkStatsTest.java

@@ -294,6 +294,22 @@ public void testWithoutUid() throws Exception {
         assertValues(after, 1, TEST_IFACE, 101, SET_DEFAULT, 0xF00D, 128L, 8L, 0L, 0L, 0L);
     }
 
+    public void testClone() throws Exception {
+        final NetworkStats original = new NetworkStats(TEST_START, 5)
+                .addValues(TEST_IFACE, 100, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 2L, 20L)
+                .addValues(TEST_IFACE2, 100, SET_DEFAULT, TAG_NONE, 512L, 32L, 0L, 0L, 0L);
+
+        // make clone and mutate original
+        final NetworkStats clone = original.clone();
+        original.addValues(TEST_IFACE, 101, SET_DEFAULT, TAG_NONE, 128L, 8L, 0L, 0L, 0L);
+
+        assertEquals(3, original.size());
+        assertEquals(2, clone.size());
+
+        assertEquals(128L + 512L + 128L, original.getTotalBytes());
+        assertEquals(128L + 512L, clone.getTotalBytes());
+    }
+
     private static void assertValues(NetworkStats stats, int index, String iface, int uid, int set,
             int tag, long rxBytes, long rxPackets, long txBytes, long txPackets, long operations) {
         final NetworkStats.Entry entry = stats.getValues(index, null);

services/java/com/android/server/net/NetworkStatsService.java

@@ -971,8 +971,7 @@ private void performUidPollLocked(NetworkStats uidSnapshot, long currentTime) {
         }
 
         mLastPollUidSnapshot = uidSnapshot;
-        mLastPollOperationsSnapshot = mOperations;
-        mOperations = new NetworkStats(0L, 10);
+        mLastPollOperationsSnapshot = mOperations.clone();
     }
 
     /**