Method getInstance

app/src/main/java/eu/faircode/email/DB.java:437–526

(Context context)

    }

    public static synchronized DB getInstance(Context context) {
        int apid = android.os.Process.myPid();
        Context acontext = context.getApplicationContext();
        if (sInstance != null &&
                (sPid != apid || !Objects.equals(sContext, acontext)))
            try {
                Log.e("Orphan database instance pid=" + apid + "/" + sPid);
                sInstance = null;
            } catch (Throwable ex) {
                Log.e(ex);
            }
        sPid = apid;
        sContext = acontext;

        if (sInstance == null) {
            Log.i("Creating database instance pid=" + sPid);

            sInstance = migrate(sContext, getBuilder(sContext)).build();

            Helper.getSerialExecutor().execute(new Runnable() {
                @Override
                public void run() {
                    checkEmergencyBackup(sContext);
                }
            });

            try {
                Log.i("Disabling view invalidation");

                Field fmViewTables = InvalidationTracker.class.getDeclaredField("mViewTables");
                fmViewTables.setAccessible(true);

                Map<String, Set<String>> mViewTables = (Map) fmViewTables.get(sInstance.getInvalidationTracker());
                mViewTables.get("account_view").clear();
                mViewTables.get("identity_view").clear();
                mViewTables.get("folder_view").clear();

                Log.i("Disabled view invalidation");
            } catch (ReflectiveOperationException ex) {
                // Should never happen
                Log.forceCrashReport(context, ex);
            }

            sInstance.getInvalidationTracker().addObserver(new InvalidationTracker.Observer(DB_TABLES) {
                @Override
                public void onInvalidated(@NonNull Set<String> tables) {
                    Log.d("ROOM invalidated=" + TextUtils.join(",", tables));
                }
            });

            // Ref: https://android-review.googlesource.com/c/platform/frameworks/support/+/1797472
            Log.i("DB critical section start");
            File dbDir = context.getDatabasePath(DB_NAME).getParentFile();
            dbDir.mkdirs();
            File lockFile = new File(dbDir, DB_NAME + ".lock");
            try (FileOutputStream fos = new FileOutputStream(lockFile)) {
                ObjectHolder<FileLock> lock = new ObjectHolder<>(null);
                try {