Enable SQLite configuration to be set with system properties.

This change does not alter the behavior of the system except to
enable the use of system properties to override SQLite configuration
options for debugging.

Bug: 6484633
Change-Id: I8908a3ba07910a1193396e2e45791e9faa7be349

Author: Jeff Brown

core/java/android/database/sqlite/SQLiteGlobal.java

@@ -18,6 +18,7 @@
 
 import android.content.res.Resources;
 import android.os.StatFs;
+import android.os.SystemProperties;
 
 /**
  * Provides access to SQLite functions that affect all database connection,
@@ -62,55 +63,63 @@ public static int getDefaultPageSize() {
             if (sDefaultPageSize == 0) {
                 sDefaultPageSize = new StatFs("/data").getBlockSize();
             }
-            return sDefaultPageSize;
+            return SystemProperties.getInt("debug.sqlite.pagesize", sDefaultPageSize);
         }
     }
 
     /**
      * Gets the default journal mode when WAL is not in use.
      */
     public static String getDefaultJournalMode() {
-        return Resources.getSystem().getString(
-                com.android.internal.R.string.db_default_journal_mode);
+        return SystemProperties.get("debug.sqlite.journalmode",
+                Resources.getSystem().getString(
+                com.android.internal.R.string.db_default_journal_mode));
     }
 
     /**
      * Gets the journal size limit in bytes.
      */
     public static int getJournalSizeLimit() {
-        return Resources.getSystem().getInteger(
-                com.android.internal.R.integer.db_journal_size_limit);
+        return SystemProperties.getInt("debug.sqlite.journalsizelimit",
+                Resources.getSystem().getInteger(
+                com.android.internal.R.integer.db_journal_size_limit));
     }
 
     /**
      * Gets the default database synchronization mode when WAL is not in use.
      */
     public static String getDefaultSyncMode() {
-        return Resources.getSystem().getString(
-                com.android.internal.R.string.db_default_sync_mode);
+        return SystemProperties.get("debug.sqlite.syncmode",
+                Resources.getSystem().getString(
+                com.android.internal.R.string.db_default_sync_mode));
     }
 
     /**
      * Gets the database synchronization mode when in WAL mode.
      */
     public static String getWALSyncMode() {
-        return Resources.getSystem().getString(
-                com.android.internal.R.string.db_wal_sync_mode);
+        return SystemProperties.get("debug.sqlite.wal.syncmode",
+                Resources.getSystem().getString(
+                com.android.internal.R.string.db_wal_sync_mode));
     }
 
     /**
      * Gets the WAL auto-checkpoint integer in database pages.
      */
     public static int getWALAutoCheckpoint() {
-        return Math.max(1, Resources.getSystem().getInteger(
+        int value = SystemProperties.getInt("debug.sqlite.wal.autocheckpoint",
+                Resources.getSystem().getInteger(
                 com.android.internal.R.integer.db_wal_autocheckpoint));
+        return Math.max(1, value);
     }
 
     /**
      * Gets the connection pool size when in WAL mode.
      */
     public static int getWALConnectionPoolSize() {
-        return Math.max(2, Resources.getSystem().getInteger(
+        int value = SystemProperties.getInt("debug.sqlite.wal.poolsize",
+                Resources.getSystem().getInteger(
                 com.android.internal.R.integer.db_connection_pool_size));
+        return Math.max(2, value);
     }
 }