1 files changed, 79 insertions, 0 deletions
diff --git a/src/java/com/android/internal/telephony/metrics/ModemRestartStats.java b/src/java/com/android/internal/telephony/metrics/ModemRestartStats.java
new file mode 100644
index 0000000000..343bd4230d
--- /dev/null
+++ b/src/java/com/android/internal/telephony/metrics/ModemRestartStats.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * 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 com.android.internal.telephony.metrics;
+
+import static android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+
+import static com.android.internal.telephony.TelephonyStatsLog.MODEM_RESTART;
+
+import android.os.Build;
+
+import com.android.internal.telephony.Phone;
+import com.android.internal.telephony.PhoneFactory;
+import com.android.internal.telephony.TelephonyStatsLog;
+import com.android.telephony.Rlog;
+
+/** Metrics for the modem restarts. */
+public class ModemRestartStats {
+    private static final String TAG = ModemRestartStats.class.getSimpleName();
+
+    /* Maximum length of the baseband version. */
+    private static final int MAX_BASEBAND_LEN = 100;
+
+    /* Maximum length of the modem restart reason. */
+    private static final int MAX_REASON_LEN = 100;
+
+    private ModemRestartStats() { }
+
+    /** Generate metrics when modem restart occurs. */
+    public static void onModemRestart(String reason) {
+        reason = truncateString(reason, MAX_REASON_LEN);
+        String basebandVersion = truncateString(Build.getRadioVersion(), MAX_BASEBAND_LEN);
+        int carrierId = getCarrierId();
+
+        Rlog.d(TAG, "Modem restart (carrier=" + carrierId + "): " + reason);
+        TelephonyStatsLog.write(MODEM_RESTART, basebandVersion, reason, carrierId);
+    }
+
+    private static String truncateString(String string, int maxLen) {
+        string = nullToEmpty(string);
+        if (string.length() > maxLen) {
+            string = string.substring(0, maxLen);
+        }
+        return string;
+    }
+
+    private static String nullToEmpty(String string) {
+        return string != null ? string : "";
+    }
+
+    /** Returns the carrier ID of the first SIM card for which carrier ID is available. */
+    private static int getCarrierId() {
+        int carrierId = INVALID_SUBSCRIPTION_ID;
+        try {
+            for (Phone phone : PhoneFactory.getPhones()) {
+                carrierId = phone.getCarrierId();
+                if (carrierId != INVALID_SUBSCRIPTION_ID) {
+                    break;
+                }
+            }
+        } catch (IllegalStateException e) {
+            // Nothing to do here.
+        }
+        return carrierId;
+    }
+}