1 files changed, 81 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/notedb/rebuild/ChangeRebuilder.java b/java/com/google/gerrit/server/notedb/rebuild/ChangeRebuilder.java
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+++ b/java/com/google/gerrit/server/notedb/rebuild/ChangeRebuilder.java
@@ -0,0 +1,81 @@
+// Copyright (C) 2016 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.rebuild;
+
+import com.google.common.util.concurrent.ListenableFuture;
+import com.google.common.util.concurrent.ListeningExecutorService;
+import com.google.gerrit.reviewdb.client.Change;
+import com.google.gerrit.reviewdb.client.Project;
+import com.google.gerrit.reviewdb.server.ReviewDb;
+import com.google.gerrit.server.notedb.ChangeBundle;
+import com.google.gerrit.server.notedb.NoteDbUpdateManager;
+import com.google.gerrit.server.notedb.NoteDbUpdateManager.Result;
+import com.google.gwtorm.server.OrmException;
+import com.google.gwtorm.server.SchemaFactory;
+import java.io.IOException;
+
+public abstract class ChangeRebuilder {
+  public static class NoPatchSetsException extends OrmException {
+    private static final long serialVersionUID = 1L;
+
+    NoPatchSetsException(Change.Id changeId) {
+      super("Change " + changeId + " cannot be rebuilt because it has no patch sets");
+    }
+  }
+
+  private final SchemaFactory<ReviewDb> schemaFactory;
+
+  protected ChangeRebuilder(SchemaFactory<ReviewDb> schemaFactory) {
+    this.schemaFactory = schemaFactory;
+  }
+
+  public final ListenableFuture<Result> rebuildAsync(
+      Change.Id id, ListeningExecutorService executor) {
+    return executor.submit(
+        () -> {
+          try (ReviewDb db = schemaFactory.open()) {
+            return rebuild(db, id);
+          }
+        });
+  }
+
+  /**
+   * Rebuild ReviewDb contents by copying from NoteDb.
+   *
+   * <p>Requires NoteDb to be the primary storage for the change.
+   */
+  public abstract void rebuildReviewDb(ReviewDb db, Project.NameKey project, Change.Id changeId)
+      throws OrmException;
+
+  // In the following methods "rebuilding" always refers to copying the state
+  // from ReviewDb to NoteDb, i.e. assuming ReviewDb is the primary storage.
+
+  public abstract Result rebuild(ReviewDb db, Change.Id changeId) throws IOException, OrmException;
+
+  public abstract Result rebuildEvenIfReadOnly(ReviewDb db, Change.Id changeId)
+      throws IOException, OrmException;
+
+  public abstract Result rebuild(NoteDbUpdateManager manager, ChangeBundle bundle)
+      throws IOException, OrmException;
+
+  public abstract void buildUpdates(NoteDbUpdateManager manager, ChangeBundle bundle)
+      throws IOException, OrmException;
+
+  public abstract NoteDbUpdateManager stage(ReviewDb db, Change.Id changeId)
+      throws IOException, OrmException;
+
+  public abstract Result execute(ReviewDb db, Change.Id changeId, NoteDbUpdateManager manager)
+      throws OrmException, IOException;
+}