SERVER-28793 unit tests for ShardServerCatalogCacheLoader in primary mode

1 files changed, 88 insertions, 0 deletions

diff --git a/src/mongo/db/s/catalog_cache_loader_mock.h b/src/mongo/db/s/catalog_cache_loader_mock.h
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+/**
+ *    Copyright (C) 2017 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.
+ */
+
+#pragma once
+
+#include "mongo/s/catalog_cache_loader.h"
+#include "mongo/util/concurrency/thread_pool.h"
+
+namespace mongo {
+
+/**
+ * Mocks the metadata refresh results with settable return values. The purpose of this class is to
+ * facilitate testing of classes that use a CatalogCacheLoader.
+ */
+class CatalogCacheLoaderMock final : public CatalogCacheLoader {
+    MONGO_DISALLOW_COPYING(CatalogCacheLoaderMock);
+
+public:
+    CatalogCacheLoaderMock();
+    ~CatalogCacheLoaderMock();
+
+    /**
+     * These functions should never be called. They trigger invariants if called.
+     */
+    void initializeReplicaSetRole(bool isPrimary) override;
+    void onStepDown() override;
+    void onStepUp() override;
+    void notifyOfCollectionVersionUpdate(const NamespaceString& nss) override;
+    Status waitForCollectionVersion(OperationContext* opCtx,
+                                    const NamespaceString& nss,
+                                    const ChunkVersion& version) override;
+
+    std::shared_ptr<Notification<void>> getChunksSince(
+        const NamespaceString& nss,
+        ChunkVersion version,
+        stdx::function<void(OperationContext*, StatusWith<CollectionAndChangedChunks>)> callbackFn)
+        override;
+
+    /**
+     * Sets the mocked collection entry result that getChunksSince will use to construct its return
+     * value.
+     */
+    void setCollectionRefreshReturnValue(StatusWith<CollectionType> statusWithCollectionType);
+
+    /**
+     * Sets the mocked chunk results that getChunksSince will use to construct its return value.
+     */
+    void setChunkRefreshReturnValue(StatusWith<std::vector<ChunkType>> statusWithChunks);
+
+private:
+    // These variables hold the mocked chunks and collection entry results used to construct the
+    // return value of getChunksSince above.
+    StatusWith<CollectionType> _swCollectionReturnValue{Status(
+        ErrorCodes::InternalError, "config loader mock collection response is uninitialized")};
+
+    StatusWith<std::vector<ChunkType>> _swChunksReturnValue{
+        Status(ErrorCodes::InternalError, "config loader mock chunks response is uninitialized")};
+
+    // Thread pool on which to mock load chunk metadata.
+    ThreadPool _threadPool;
+};
+
+}  // namespace mongo