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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.checkArgument;
import static com.google.common.base.Preconditions.checkState;
import static java.util.Objects.requireNonNull;
import com.google.common.collect.Lists;
import com.google.gerrit.reviewdb.client.Account;
import com.google.gerrit.reviewdb.client.PatchSet;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.Objects;
class EventList<E extends Event> implements Iterable<E> {
private final ArrayList<E> list = new ArrayList<>();
private boolean isSubmit;
@Override
public Iterator<E> iterator() {
return list.iterator();
}
void add(E e) {
list.add(e);
if (e.isSubmit()) {
isSubmit = true;
}
}
void clear() {
list.clear();
isSubmit = false;
}
boolean isEmpty() {
return list.isEmpty();
}
boolean canAdd(E e) {
if (isEmpty()) {
return true;
}
if (e instanceof FinalUpdatesEvent) {
return false; // FinalUpdatesEvent always gets its own update.
}
Event last = getLast();
if (!Objects.equals(e.user, last.user)
|| !Objects.equals(e.realUser, last.realUser)
|| !e.psId.equals(last.psId)) {
return false; // Different patch set or author.
}
if (e.canHaveTag() && canHaveTag() && !Objects.equals(e.tag, getTag())) {
// We should trust the tag field, and it doesn't match.
return false;
}
if (e.isPostSubmitApproval() && isSubmit) {
// Post-submit approvals must come after the update that submits.
return false;
}
long t = e.when.getTime();
long tFirst = getFirstTime();
long tLast = getLastTime();
checkArgument(t >= tLast, "event %s is before previous event in list %s", e, last);
if (t - tLast > ChangeRebuilderImpl.MAX_DELTA_MS
|| t - tFirst > ChangeRebuilderImpl.MAX_WINDOW_MS) {
return false; // Too much time elapsed.
}
if (!e.uniquePerUpdate()) {
return true;
}
for (Event o : this) {
if (e.getClass() == o.getClass()) {
return false; // Only one event of this type allowed per update.
}
}
// TODO(dborowitz): Additional heuristics, like keeping events separate if
// they affect overlapping fields within a single entity.
return true;
}
Timestamp getWhen() {
return get(0).when;
}
PatchSet.Id getPatchSetId() {
PatchSet.Id id = requireNonNull(get(0).psId);
for (int i = 1; i < size(); i++) {
checkState(
get(i).psId.equals(id), "mismatched patch sets in EventList: %s != %s", id, get(i).psId);
}
return id;
}
Account.Id getAccountId() {
Account.Id id = get(0).user;
for (int i = 1; i < size(); i++) {
checkState(
Objects.equals(id, get(i).user),
"mismatched users in EventList: %s != %s",
id,
get(i).user);
}
return id;
}
Account.Id getRealAccountId() {
Account.Id id = get(0).realUser;
for (int i = 1; i < size(); i++) {
checkState(
Objects.equals(id, get(i).realUser),
"mismatched real users in EventList: %s != %s",
id,
get(i).realUser);
}
return id;
}
String getTag() {
for (E e : Lists.reverse(list)) {
if (e.tag != null) {
return e.tag;
}
}
return null;
}
private boolean canHaveTag() {
return list.stream().anyMatch(Event::canHaveTag);
}
private E get(int i) {
return list.get(i);
}
private int size() {
return list.size();
}
private E getLast() {
return list.get(list.size() - 1);
}
private long getLastTime() {
return getLast().when.getTime();
}
private long getFirstTime() {
return list.get(0).when.getTime();
}
}
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