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diff --git a/src/mongo/s/commands/strategy.h b/src/mongo/s/commands/strategy.h
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+++ b/src/mongo/s/commands/strategy.h
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+/**
+ *    Copyright (C) 2010-2014 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 <atomic>
+
+#include "mongo/db/query/explain_common.h"
+#include "mongo/client/connection_string.h"
+#include "mongo/s/client/shard.h"
+
+namespace mongo {
+
+class LiteParsedQuery;
+class OperationContext;
+class QueryMessage;
+class Request;
+
+namespace rpc {
+class ServerSelectionMetadata;
+}  // namespace rpc
+
+/**
+ * Legacy interface for processing client read/write/cmd requests.
+ */
+class Strategy {
+public:
+    static void queryOp(OperationContext* txn, Request& request);
+
+    static void getMore(OperationContext* txn, Request& request);
+
+    static void killCursors(OperationContext* txn, Request& request);
+
+    static void writeOp(OperationContext* txn, int op, Request& request);
+
+    /**
+     * Helper to run an explain of a find operation on the shards. Fills 'out' with the result of
+     * the of the explain command on success. On failure, returns a non-OK status and does not
+     * modify 'out'.
+     *
+     * Used both if mongos receives an explain command and if it receives an OP_QUERY find with the
+     * $explain modifier.
+     */
+    static Status explainFind(OperationContext* txn,
+                              const BSONObj& findCommand,
+                              const LiteParsedQuery& lpq,
+                              ExplainCommon::Verbosity verbosity,
+                              const rpc::ServerSelectionMetadata& serverSelectionMetadata,
+                              BSONObjBuilder* out);
+
+    struct CommandResult {
+        ShardId shardTargetId;
+        ConnectionString target;
+        BSONObj result;
+    };
+
+    /**
+     * Executes a command against a particular database, and targets the command based on a
+     * collection in that database.
+     *
+     * This version should be used by internal commands when possible.
+     *
+     * TODO: Replace these methods and all other methods of command dispatch with a more general
+     * command op framework.
+     */
+    static void commandOp(OperationContext* txn,
+                          const std::string& db,
+                          const BSONObj& command,
+                          int options,
+                          const std::string& versionedNS,
+                          const BSONObj& targetingQuery,
+                          std::vector<CommandResult>* results);
+
+    /**
+     * Executes a command represented in the Request on the sharded cluster.
+     *
+     * DEPRECATED: should not be used by new code.
+     */
+    static void clientCommandOp(OperationContext* txn, Request& request);
+
+protected:
+    static bool handleSpecialNamespaces(OperationContext* txn, Request& request, QueryMessage& q);
+};
+
+}  // namespace mongo