| // Copyright (C) 2017 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.google.gerrit.server.notedb; |
| |
| import com.google.inject.Singleton; |
| import java.util.Objects; |
| |
| /** |
| * Current low-level settings of the NoteDb migration for changes. |
| * |
| * <p>This class is a stub and will be removed soon; NoteDb is the only mode. |
| */ |
| @Singleton |
| public class NotesMigration { |
| public static final String SECTION_NOTE_DB = "noteDb"; |
| private static final String READ = "read"; |
| private static final String WRITE = "write"; |
| private static final String DISABLE_REVIEW_DB = "disableReviewDb"; |
| private static final String PRIMARY_STORAGE = "primaryStorage"; |
| private static final String SEQUENCE = "sequence"; |
| |
| /** |
| * Read changes from NoteDb. |
| * |
| * <p>Change data is read from NoteDb refs, but ReviewDb is still the source of truth. If the |
| * loader determines NoteDb is out of date, the change data in NoteDb will be transparently |
| * rebuilt. This means that some code paths that look read-only may in fact attempt to write. |
| * |
| * <p>If true and {@code writeChanges() = false}, changes can still be read from NoteDb, but any |
| * attempts to write will generate an error. |
| */ |
| public final boolean readChanges() { |
| return true; |
| } |
| |
| /** |
| * Disable ReviewDb access for changes. |
| * |
| * <p>When set, ReviewDb operations involving the Changes table become no-ops. Lookups return no |
| * results; updates do nothing, as does opening, committing, or rolling back a transaction on the |
| * Changes table. |
| */ |
| public final boolean disableChangeReviewDb() { |
| return true; |
| } |
| |
| public final boolean commitChangeWrites() { |
| return true; |
| } |
| |
| public final boolean failChangeWrites() { |
| return false; |
| } |
| |
| @Override |
| public final boolean equals(Object o) { |
| return o instanceof NotesMigration; |
| } |
| |
| @Override |
| public final int hashCode() { |
| return Objects.hash(); |
| } |
| |
| public NotesMigration() {} |
| } |