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// 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 static com.google.common.base.Preconditions.checkState;
import static com.google.gerrit.server.notedb.rebuild.ChangeRebuilderImpl.MAX_WINDOW_MS;
import com.google.common.base.MoreObjects;
import com.google.common.base.MoreObjects.ToStringHelper;
import com.google.common.collect.ComparisonChain;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.PatchSet;
import com.google.gerrit.reviewdb.server.ReviewDbUtil;
import com.google.gerrit.server.notedb.AbstractChangeUpdate;
import com.google.gerrit.server.notedb.ChangeUpdate;
import com.google.gwtorm.server.OrmException;
import java.io.IOException;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
abstract class Event implements Comparable<Event> {
// NOTE: EventList only supports direct subclasses, not an arbitrary
// hierarchy.
final Account.Id user;
final Account.Id realUser;
final String tag;
final boolean predatesChange;
/** Dependencies of this event; other events that must happen before this one. */
final List<Event> deps;
Timestamp when;
PatchSet.Id psId;
protected Event(
PatchSet.Id psId,
Account.Id effectiveUser,
Account.Id realUser,
Timestamp when,
Timestamp changeCreatedOn,
String tag) {
this.psId = psId;
this.user = effectiveUser;
this.realUser = realUser != null ? realUser : effectiveUser;
this.tag = tag;
// Truncate timestamps at the change's createdOn timestamp.
predatesChange = when.before(changeCreatedOn);
this.when = predatesChange ? changeCreatedOn : when;
deps = new ArrayList<>();
}
protected void checkUpdate(AbstractChangeUpdate update) {
checkState(
Objects.equals(update.getPatchSetId(), psId),
"cannot apply event for %s to update for %s",
update.getPatchSetId(),
psId);
checkState(
when.getTime() - update.getWhen().getTime() <= MAX_WINDOW_MS,
"event at %s outside update window starting at %s",
when,
update.getWhen());
checkState(
Objects.equals(update.getNullableAccountId(), user),
"cannot apply event by %s to update by %s",
user,
update.getNullableAccountId());
}
Event addDep(Event e) {
deps.add(e);
return this;
}
/**
* @return whether this event type must be unique per {@link ChangeUpdate}, i.e. there may be at
* most one of this type.
*/
abstract boolean uniquePerUpdate();
abstract void apply(ChangeUpdate update) throws OrmException, IOException;
protected boolean isPostSubmitApproval() {
return false;
}
protected boolean isSubmit() {
return false;
}
protected boolean canHaveTag() {
return false;
}
@Override
public String toString() {
ToStringHelper helper =
MoreObjects.toStringHelper(this)
.add("psId", psId)
.add("effectiveUser", user)
.add("realUser", realUser)
.add("when", when)
.add("tag", tag);
addToString(helper);
return helper.toString();
}
/** @param helper toString helper to add fields to */
protected void addToString(ToStringHelper helper) {}
@Override
public int compareTo(Event other) {
return ComparisonChain.start()
.compareFalseFirst(this.isFinalUpdates(), other.isFinalUpdates())
.compare(this.when, other.when)
.compareTrueFirst(isPatchSet(), isPatchSet())
.compareTrueFirst(this.predatesChange, other.predatesChange)
.compare(this.user, other.user, ReviewDbUtil.intKeyOrdering())
.compare(this.realUser, other.realUser, ReviewDbUtil.intKeyOrdering())
.compare(this.psId, other.psId, ReviewDbUtil.intKeyOrdering().nullsLast())
.result();
}
private boolean isPatchSet() {
return this instanceof PatchSetEvent;
}
private boolean isFinalUpdates() {
return this instanceof FinalUpdatesEvent;
}
}
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