| // Copyright (C) 2013 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.index.change; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| import static com.google.gerrit.server.index.change.ChangeField.CHANGE; |
| import static com.google.gerrit.server.index.change.ChangeField.PROJECT; |
| |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.base.Function; |
| import com.google.common.collect.ImmutableSet; |
| import com.google.common.collect.Iterables; |
| import com.google.gerrit.reviewdb.client.Change; |
| import com.google.gerrit.server.index.IndexConfig; |
| import com.google.gerrit.server.index.IndexPredicate; |
| import com.google.gerrit.server.index.IndexedQuery; |
| import com.google.gerrit.server.index.QueryOptions; |
| import com.google.gerrit.server.query.DataSource; |
| import com.google.gerrit.server.query.Matchable; |
| import com.google.gerrit.server.query.Predicate; |
| import com.google.gerrit.server.query.QueryParseException; |
| import com.google.gerrit.server.query.change.ChangeData; |
| import com.google.gerrit.server.query.change.ChangeDataSource; |
| import com.google.gwtorm.server.OrmException; |
| import com.google.gwtorm.server.ResultSet; |
| |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| /** |
| * Wrapper combining an {@link IndexPredicate} together with a |
| * {@link ChangeDataSource} that returns matching results from the index. |
| * <p> |
| * Appropriate to return as the rootmost predicate that can be processed using |
| * the secondary index; such predicates must also implement |
| * {@link ChangeDataSource} to be chosen by the query processor. |
| */ |
| public class IndexedChangeQuery extends IndexedQuery<Change.Id, ChangeData> |
| implements ChangeDataSource, Matchable<ChangeData> { |
| public static QueryOptions oneResult() { |
| return createOptions(IndexConfig.createDefault(), 0, 1, |
| ImmutableSet.<String> of()); |
| } |
| |
| public static QueryOptions createOptions(IndexConfig config, int start, |
| int limit, Set<String> fields) { |
| // Always include project since it is needed to load the change from NoteDb. |
| if (!fields.contains(CHANGE.getName()) |
| && !fields.contains(PROJECT.getName())) { |
| fields = new HashSet<>(fields); |
| fields.add(PROJECT.getName()); |
| } |
| return QueryOptions.create(config, start, limit, fields); |
| } |
| |
| @VisibleForTesting |
| static QueryOptions convertOptions(QueryOptions opts) { |
| opts = opts.convertForBackend(); |
| return IndexedChangeQuery.createOptions(opts.config(), opts.start(), |
| opts.limit(), opts.fields()); |
| } |
| |
| private final Map<ChangeData, DataSource<ChangeData>> fromSource; |
| |
| public IndexedChangeQuery(ChangeIndex index, Predicate<ChangeData> pred, |
| QueryOptions opts) throws QueryParseException { |
| super(index, pred, convertOptions(opts)); |
| this.fromSource = new HashMap<>(); |
| } |
| |
| @Override |
| public ResultSet<ChangeData> read() throws OrmException { |
| final DataSource<ChangeData> currSource = source; |
| final ResultSet<ChangeData> rs = currSource.read(); |
| |
| return new ResultSet<ChangeData>() { |
| @Override |
| public Iterator<ChangeData> iterator() { |
| return Iterables.transform( |
| rs, |
| new Function<ChangeData, ChangeData>() { |
| @Override |
| public ChangeData apply(ChangeData cd) { |
| fromSource.put(cd, currSource); |
| return cd; |
| } |
| }).iterator(); |
| } |
| |
| @Override |
| public List<ChangeData> toList() { |
| List<ChangeData> r = rs.toList(); |
| for (ChangeData cd : r) { |
| fromSource.put(cd, currSource); |
| } |
| return r; |
| } |
| |
| @Override |
| public void close() { |
| rs.close(); |
| } |
| }; |
| } |
| |
| @Override |
| public boolean match(ChangeData cd) throws OrmException { |
| if (source != null && fromSource.get(cd) == source) { |
| return true; |
| } |
| |
| Predicate<ChangeData> pred = getChild(0); |
| checkState(pred.isMatchable(), |
| "match invoked, but child predicate %s " + "doesn't implement %s", pred, |
| Matchable.class.getName()); |
| return pred.asMatchable().match(cd); |
| } |
| |
| @Override |
| public int getCost() { |
| // Index queries are assumed to be cheaper than any other type of query, so |
| // so try to make sure they get picked. Note that pred's cost may be higher |
| // because it doesn't know whether it's being used in an index query or not. |
| return 1; |
| } |
| |
| @Override |
| public boolean hasChange() { |
| return index.getSchema().hasField(ChangeField.CHANGE); |
| } |
| } |