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// Copyright (C) 2019 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.index.query;
import static com.google.gerrit.testing.GerritJUnit.assertThrows;
import com.google.common.collect.ImmutableList;
import com.google.gerrit.server.query.change.ChangeData;
import com.google.gerrit.server.query.change.ChangeDataSource;
import com.google.gerrit.server.query.change.OrSource;
import java.util.Collection;
import java.util.Iterator;
import org.junit.Test;
/**
* Tests that boolean data sources are lazy in that they don't call {@link ResultSet#toList()} or
* {@link ResultSet#toList()}. This is necessary because it allows Gerrit to send multiple queries
* to the index in parallel, have the results come in asynchronously and wait for them only when we
* call aforementioned methods on the {@link ResultSet}.
*/
public class LazyDataSourceTest {
/** Helper to avoid a mock which would be hard to create because of the type inference. */
static class LazyPredicate extends Predicate<ChangeData> implements ChangeDataSource {
@Override
public int getCardinality() {
return 1;
}
@Override
public ResultSet<ChangeData> read() {
return new FailingResultSet<>();
}
@Override
public ResultSet<FieldBundle> readRaw() {
return new FailingResultSet<>();
}
@Override
public Predicate<ChangeData> copy(Collection<? extends Predicate<ChangeData>> children) {
throw new UnsupportedOperationException("not implemented");
}
@Override
public int hashCode() {
throw new UnsupportedOperationException("not implemented");
}
@Override
public boolean equals(Object other) {
throw new UnsupportedOperationException("not implemented");
}
@Override
public boolean hasChange() {
throw new UnsupportedOperationException("not implemented");
}
}
/** Implementation that throws {@link AssertionError} when accessing results. */
static class FailingResultSet<T> implements ResultSet<T> {
@Override
public Iterator<T> iterator() {
throw new AssertionError(
"called iterator() on the result set, but shouldn't have because the data source must be lazy");
}
@Override
public ImmutableList<T> toList() {
throw new AssertionError(
"called toList() on the result set, but shouldn't have because the data source must be lazy");
}
@Override
public void close() {
// No-op
}
}
@Test
public void andSourceIsLazy() {
AndSource<ChangeData> and = new AndSource<>(ImmutableList.of(new LazyPredicate()));
ResultSet<ChangeData> resultSet = and.read();
assertThrows(AssertionError.class, () -> resultSet.toList());
}
@Test
public void orSourceIsLazy() {
OrSource or = new OrSource(ImmutableList.of(new LazyPredicate()));
ResultSet<ChangeData> resultSet = or.read();
assertThrows(AssertionError.class, () -> resultSet.toList());
}
}
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