Update SyncStorageEngine to use protos.

Status and Statistics info within SyncStorageEngine was being stored
using Parcels, which is not recommended. Updating both of them to use
protos now. Additionally, because of protos, storage space on disk
consumed by these files are reduced by more than 50%.

Also added unit tests for SyncStorageEngine.

Bug: 38177679
Test: atest com.android.server.content.SyncStorageEngineTest
Test: build and flash - no errors in logs
Change-Id: I187cb6c271333f366f5c7f651f75b4161fee90d4

1 files changed, 52 insertions, 4 deletions

diff --git a/core/java/android/content/SyncStatusInfo.java b/core/java/android/content/SyncStatusInfo.java
index 3f6451577258..0eea47a248af 100644
--- a/core/java/android/content/SyncStatusInfo.java
+++ b/core/java/android/content/SyncStatusInfo.java
@@ -20,6 +20,9 @@ import android.annotation.UnsupportedAppUsage;
 import android.os.Parcel;
 import android.os.Parcelable;
 import android.util.Log;
+import android.util.Pair;
+
+import com.android.internal.util.ArrayUtils;
 
 import java.util.ArrayList;
 import java.util.Calendar;
@@ -139,10 +142,10 @@ public class SyncStatusInfo implements Parcelable {
     public final long[] perSourceLastSuccessTimes = new long[SOURCE_COUNT];
     public final long[] perSourceLastFailureTimes = new long[SOURCE_COUNT];
 
-  // Warning: It is up to the external caller to ensure there are
-  // no race conditions when accessing this list
-  @UnsupportedAppUsage
-  private ArrayList<Long> periodicSyncTimes;
+    // Warning: It is up to the external caller to ensure there are
+    // no race conditions when accessing this list
+    @UnsupportedAppUsage
+    private ArrayList<Long> periodicSyncTimes;
 
     private final ArrayList<Long> mLastEventTimes = new ArrayList<>();
     private final ArrayList<String> mLastEvents = new ArrayList<>();
@@ -292,9 +295,28 @@ public class SyncStatusInfo implements Parcelable {
         }
     }
 
+    /**
+     * Copies all data from the given SyncStatusInfo object.
+     *
+     * @param other the SyncStatusInfo object to copy data from
+     */
     public SyncStatusInfo(SyncStatusInfo other) {
         authorityId = other.authorityId;
+        copyFrom(other);
+    }
+
+    /**
+     * Copies all data from the given SyncStatusInfo object except for its authority id.
+     *
+     * @param authorityId the new authority id
+     * @param other the SyncStatusInfo object to copy data from
+     */
+    public SyncStatusInfo(int authorityId, SyncStatusInfo other) {
+        this.authorityId = authorityId;
+        copyFrom(other);
+    }
 
+    private void copyFrom(SyncStatusInfo other) {
         other.totalStats.copyTo(totalStats);
         other.todayStats.copyTo(todayStats);
         other.yesterdayStats.copyTo(yesterdayStats);
@@ -323,6 +345,14 @@ public class SyncStatusInfo implements Parcelable {
         System.arraycopy(from, 0, to, 0, to.length);
     }
 
+    public int getPeriodicSyncTimesSize() {
+        return periodicSyncTimes == null ? 0 : periodicSyncTimes.size();
+    }
+
+    public void addPeriodicSyncTime(long time) {
+        periodicSyncTimes = ArrayUtils.add(periodicSyncTimes, time);
+    }
+
     @UnsupportedAppUsage
     public void setPeriodicSyncTime(int index, long when) {
         // The list is initialized lazily when scheduling occurs so we need to make sure
@@ -347,6 +377,24 @@ public class SyncStatusInfo implements Parcelable {
         }
     }
 
+    /**
+     * Populates {@code mLastEventTimes} and {@code mLastEvents} with the given list. <br>
+     * <i>Note: This method is mainly used to repopulate the event info from disk and it will clear
+     * both {@code mLastEventTimes} and {@code mLastEvents} before populating.</i>
+     *
+     * @param lastEventInformation the list to populate with
+     */
+    public void populateLastEventsInformation(ArrayList<Pair<Long, String>> lastEventInformation) {
+        mLastEventTimes.clear();
+        mLastEvents.clear();
+        final int size = lastEventInformation.size();
+        for (int i = 0; i < size; i++) {
+            final Pair<Long, String> lastEventInfo = lastEventInformation.get(i);
+            mLastEventTimes.add(lastEventInfo.first);
+            mLastEvents.add(lastEventInfo.second);
+        }
+    }
+
     /** */
     public void addEvent(String message) {
         if (mLastEventTimes.size() >= MAX_EVENT_COUNT) {