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+/*-
+ * Public Domain 2014-present MongoDB, Inc.
+ * Public Domain 2008-2014 WiredTiger, Inc.
+ *
+ * This is free and unencumbered software released into the public domain.
+ *
+ * Anyone is free to copy, modify, publish, use, compile, sell, or
+ * distribute this software, either in source code form or as a compiled
+ * binary, for any purpose, commercial or non-commercial, and by any
+ * means.
+ *
+ * In jurisdictions that recognize copyright laws, the author or authors
+ * of this software dedicate any and all copyright interest in the
+ * software to the public domain. We make this dedication for the benefit
+ * of the public at large and to the detriment of our heirs and
+ * successors. We intend this dedication to be an overt act of
+ * relinquishment in perpetuity of all present and future rights to this
+ * software under copyright law.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+ * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef DATABASE_MODEL_H
+#define DATABASE_MODEL_H
+
+#include <atomic>
+#include <string>
+#include <map>
+
+#include "workload_tracking.h"
+
+/* Forward declarations for classes to reduce compilation time and modules coupling. */
+class timestamp_manager;
+
+namespace test_harness {
+/* Key/Value type. */
+typedef std::string key_value_t;
+
+/* A collection is made of mapped key value objects. */
+class collection {
+    public:
+    explicit collection(const uint64_t id, const uint64_t key_count, const std::string &name);
+
+    /* Copies aren't allowed. */
+    collection(const collection &) = delete;
+    collection &operator=(const collection &) = delete;
+
+    uint64_t get_key_count() const;
+
+    /*
+     * Adding new keys should generally be singly threaded per collection. If two threads both
+     * attempt to add keys using the incrementing id pattern they'd frequently conflict.
+     *
+     * The usage pattern is:
+     *   1. Call get_key_count to get the number of keys already existing. Add keys with id's equal
+     *      to and greater than this value.
+     *   2. Once the transaction has successfully committed then call increase_key_count() with the
+     *      number of added keys.
+     *
+     * The set of keys should always be contiguous such that other threads calling get_key_count
+     * will always know that the keys in existence are 0 -> _key_count - 1.
+     */
+    void increase_key_count(uint64_t increment);
+
+    public:
+    const std::string name;
+    const uint64_t id;
+
+    private:
+    std::atomic<uint64_t> _key_count{0};
+};
+
+/* Representation of the collections in memory. */
+class database {
+    public:
+    static std::string build_collection_name(const uint64_t id);
+
+    public:
+    /*
+     * Add a new collection, this will create the underlying collection in the database.
+     */
+    void add_collection(uint64_t key_count = 0);
+
+    /* Get a collection using the id of the collection. */
+    collection &get_collection(uint64_t id);
+
+    /* Get a random collection. */
+    collection &get_random_collection();
+
+    /*
+     * Retrieve the current collection count, collection names are indexed from 0 so when using this
+     * take care to avoid an off by one error.
+     */
+    uint64_t get_collection_count();
+
+    /* FIX-ME-Test-Framework: Replace usages of this with get_collection_ids. */
+    std::vector<std::string> get_collection_names();
+
+    std::vector<uint64_t> get_collection_ids();
+    void set_timestamp_manager(timestamp_manager *tsm);
+    void set_workload_tracking(workload_tracking *tracking);
+    void set_create_config(bool use_compression, bool use_reverse_collator);
+
+    private:
+    std::string _collection_create_config = "";
+    scoped_session _session;
+    timestamp_manager *_tsm = nullptr;
+    workload_tracking *_tracking = nullptr;
+    uint64_t _next_collection_id = 0;
+    std::map<uint64_t, collection> _collections;
+    std::mutex _mtx;
+};
+} // namespace test_harness
+
+#endif