AccountPatchReviewStore: add possibility to cleanReviewed by change

It simplifies the clean up when change gets removed.

Change-Id: I10387b85a80a0fb8d62f686cc8f33c146a856ff3
Signed-off-by: Jacek Centkowski <jcentkowski@collab.net>

java/com/google/gerrit/server/change/AccountPatchReviewStore.java

@@ -17,6 +17,7 @@ package com.google.gerrit.server.change;
 import com.google.auto.value.AutoValue;
 import com.google.common.collect.ImmutableSet;
 import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.PatchSet;
 import java.util.Collection;
 import java.util.Optional;
@@ -81,6 +82,13 @@ public interface AccountPatchReviewStore {
    */
   void clearReviewed(PatchSet.Id psId);
 
+  /**
+   * Clears the reviewed flags for all files in all patch sets in the given change for all users.
+   *
+   * @param changeId change ID
+   */
+  void clearReviewed(Change.Id changeId);
+
   /**
    * Find the latest patch set, that is smaller or equals to the given patch set, where at least,
    * one file has been reviewed by the given user.

java/com/google/gerrit/server/change/DeleteChangeOp.java

@@ -71,7 +71,7 @@ public class DeleteChangeOp implements BatchUpdateOp {
     ensureDeletable(ctx, id, patchSets);
     // Cleaning up is only possible as long as the change and its elements are
     // still part of the database.
-    cleanUpReferences(ctx, id, patchSets);
+    cleanUpReferences(ctx, id);
 
     ctx.deleteChange();
     changeDeleted.fire(ctx.getChange(), ctx.getAccount(), ctx.getWhen());
@@ -104,11 +104,8 @@ public class DeleteChangeOp implements BatchUpdateOp {
     return revWalk.isMergedInto(revWalk.parseCommit(objectId), revWalk.parseCommit(destId.get()));
   }
 
-  private void cleanUpReferences(ChangeContext ctx, Change.Id id, Collection<PatchSet> patchSets)
-      throws NoSuchChangeException {
-    for (PatchSet ps : patchSets) {
-      accountPatchReviewStore.run(s -> s.clearReviewed(ps.getId()));
-    }
+  private void cleanUpReferences(ChangeContext ctx, Change.Id id) throws NoSuchChangeException {
+    accountPatchReviewStore.run(s -> s.clearReviewed(id));
 
     // Non-atomic operation on Accounts table; not much we can do to make it
     // atomic.

java/com/google/gerrit/server/schema/JdbcAccountPatchReviewStore.java

@@ -27,6 +27,7 @@ import com.google.gerrit.extensions.events.LifecycleListener;
 import com.google.gerrit.extensions.registration.DynamicItem;
 import com.google.gerrit.lifecycle.LifecycleModule;
 import com.google.gerrit.reviewdb.client.Account;
+import com.google.gerrit.reviewdb.client.Change;
 import com.google.gerrit.reviewdb.client.PatchSet;
 import com.google.gerrit.server.change.AccountPatchReviewStore;
 import com.google.gerrit.server.config.ConfigUtil;
@@ -294,6 +295,18 @@ public abstract class JdbcAccountPatchReviewStore
     }
   }
 
+  @Override
+  public void clearReviewed(Change.Id changeId) {
+    try (Connection con = ds.getConnection();
+        PreparedStatement stmt =
+            con.prepareStatement("DELETE FROM account_patch_reviews WHERE change_id = ?")) {
+      stmt.setInt(1, changeId.get());
+      stmt.executeUpdate();
+    } catch (SQLException e) {
+      throw convertError("delete", e);
+    }
+  }
+
   @Override
   public Optional<PatchSetWithReviewedFiles> findReviewed(PatchSet.Id psId, Account.Id accountId) {
     try (Connection con = ds.getConnection();