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/**
* Copyright (C) 2016 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/bson/bsonmisc.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/pipeline/aggregation_context_fixture.h"
#include "mongo/db/pipeline/dependencies.h"
#include "mongo/db/pipeline/document_source_limit.h"
#include "mongo/db/pipeline/document_source_match.h"
#include "mongo/db/pipeline/document_source_mock.h"
#include "mongo/db/pipeline/document_value_test_util.h"
#include "mongo/db/pipeline/pipeline.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
// This provides access to getExpCtx(), but we'll use a different name for this test suite.
using DocumentSourceLimitTest = AggregationContextFixture;
TEST_F(DocumentSourceLimitTest, ShouldDisposeSourceWhenLimitIsReached) {
auto source = DocumentSourceMock::create({"{a: 1}", "{a: 2}"});
auto limit = DocumentSourceLimit::create(getExpCtx(), 1);
limit->setSource(source.get());
// The limit's result is as expected.
auto next = limit->getNext();
ASSERT(next.isAdvanced());
ASSERT_VALUE_EQ(Value(1), next.getDocument().getField("a"));
// The limit is exhausted.
ASSERT(limit->getNext().isEOF());
// The source has been disposed
ASSERT_TRUE(source->isDisposed);
}
TEST_F(DocumentSourceLimitTest, TwoLimitStagesShouldCombineIntoOne) {
Pipeline::SourceContainer container;
auto firstLimit = DocumentSourceLimit::create(getExpCtx(), 10);
auto secondLimit = DocumentSourceLimit::create(getExpCtx(), 5);
container.push_back(firstLimit);
container.push_back(secondLimit);
firstLimit->optimizeAt(container.begin(), &container);
ASSERT_EQUALS(5, firstLimit->getLimit());
ASSERT_EQUALS(1U, container.size());
}
TEST_F(DocumentSourceLimitTest, DisposeShouldCascadeAllTheWayToSource) {
auto source = DocumentSourceMock::create({"{a: 1}", "{a: 1}"});
// Create a DocumentSourceMatch.
BSONObj spec = BSON("$match" << BSON("a" << 1));
BSONElement specElement = spec.firstElement();
auto match = DocumentSourceMatch::createFromBson(specElement, getExpCtx());
match->setSource(source.get());
auto limit = DocumentSourceLimit::create(getExpCtx(), 1);
limit->setSource(match.get());
// The limit is not exhauted.
auto next = limit->getNext();
ASSERT(next.isAdvanced());
ASSERT_VALUE_EQ(Value(1), next.getDocument().getField("a"));
// The limit is exhausted.
ASSERT(limit->getNext().isEOF());
ASSERT_TRUE(source->isDisposed);
}
TEST_F(DocumentSourceLimitTest, ShouldNotIntroduceAnyDependencies) {
auto limit = DocumentSourceLimit::create(getExpCtx(), 1);
DepsTracker dependencies;
ASSERT_EQUALS(DocumentSource::SEE_NEXT, limit->getDependencies(&dependencies));
ASSERT_EQUALS(0U, dependencies.fields.size());
ASSERT_EQUALS(false, dependencies.needWholeDocument);
ASSERT_EQUALS(false, dependencies.getNeedsMetadata(DepsTracker::MetadataType::TEXT_SCORE));
}
TEST_F(DocumentSourceLimitTest, ShouldPropagatePauses) {
auto limit = DocumentSourceLimit::create(getExpCtx(), 2);
auto mock = DocumentSourceMock::create({DocumentSource::GetNextResult::makePauseExecution(),
Document(),
DocumentSource::GetNextResult::makePauseExecution(),
Document(),
DocumentSource::GetNextResult::makePauseExecution(),
Document()});
limit->setSource(mock.get());
ASSERT_TRUE(limit->getNext().isPaused());
ASSERT_TRUE(limit->getNext().isAdvanced());
ASSERT_TRUE(limit->getNext().isPaused());
ASSERT_TRUE(limit->getNext().isAdvanced());
// We've reached the limit.
ASSERT_TRUE(mock->isDisposed);
ASSERT_TRUE(limit->getNext().isEOF());
ASSERT_TRUE(limit->getNext().isEOF());
ASSERT_TRUE(limit->getNext().isEOF());
}
} // namespace
} // namespace mongo
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