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Avoiding writing the Metadata in the backup if nothing was changed in the backup

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Change-Id: I4608ab5511b01f0d0018596d68e4341635649f73
This commit is contained in:
Sunny Goyal
2015-01-16 14:10:32 -08:00
parent 08f7261d11
commit c0ee675f69
2 changed files with 25 additions and 9 deletions
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32
src/com/android/launcher3/LauncherBackupHelper.java
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@@ -57,6 +57,7 @@ import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.zip.CRC32;
@@ -140,9 +141,9 @@ public class LauncherBackupHelper implements BackupHelper {
private IconCache mIconCache;
private BackupManager mBackupManager;
private HashMap<ComponentName, AppWidgetProviderInfo> mWidgetMap;
private byte[] mBuffer = new byte[512];
private long mLastBackupRestoreTime;
private boolean mBackupDataWasUpdated;
private DeviceProfieData mCurrentProfile;
boolean restoreSuccessful;
@@ -201,7 +202,7 @@ public class LauncherBackupHelper implements BackupHelper {
// Record the time before performing backup so that entries edited while the backup
// was going on, do not get missed in next backup.
long newBackupTime = System.currentTimeMillis();
mBackupDataWasUpdated = false;
try {
backupFavorites(data);
backupScreens(data);
@@ -219,16 +220,30 @@ public class LauncherBackupHelper implements BackupHelper {
for (String deleted: mExistingKeys) {
if (VERBOSE) Log.v(TAG, "dropping deleted item " + deleted);
data.writeEntityHeader(deleted, -1);
mBackupDataWasUpdated = true;
}
mExistingKeys.clear();
mLastBackupRestoreTime = newBackupTime;
if (!mBackupDataWasUpdated) {
// Check if any metadata has changed
mBackupDataWasUpdated = (in.profile == null)
|| !Arrays.equals(DeviceProfieData.toByteArray(in.profile),
DeviceProfieData.toByteArray(getDeviceProfieData()))
|| (in.backupVersion != BACKUP_VERSION)
|| (in.appVersion != getAppVersion());
}
// We store the journal at two places.
// 1) Storing it in newState allows us to do partial backups by comparing old state
// 2) Storing it in backup data allows us to validate keys during restore
Journal state = getCurrentStateJournal();
writeRowToBackup(JOURNAL_KEY, state, data);
if (mBackupDataWasUpdated) {
mLastBackupRestoreTime = newBackupTime;
// We store the journal at two places.
// 1) Storing it in newState allows us to do partial backups by comparing old state
// 2) Storing it in backup data allows us to validate keys during restore
Journal state = getCurrentStateJournal();
writeRowToBackup(JOURNAL_KEY, state, data);
} else {
if (DEBUG) Log.d(TAG, "Nothing was written during backup");
}
} catch (IOException e) {
Log.e(TAG, "launcher backup has failed", e);
}
@@ -1020,6 +1035,7 @@ public class LauncherBackupHelper implements BackupHelper {
byte[] blob = writeCheckedBytes(proto);
data.writeEntityHeader(backupKey, blob.length);
data.writeEntityData(blob, blob.length);
mBackupDataWasUpdated = true;
if (VERBOSE) Log.v(TAG, "Writing New entry " + backupKey);
}