SERVER-39146 Refactor Baton

Refactor the baton into regular and networking batons while also
cleaning up the basic baton implementation.

1 files changed, 78 insertions, 0 deletions

diff --git a/src/mongo/db/default_baton.h b/src/mongo/db/default_baton.h
new file mode 100644
index 00000000000..6311f397e95
--- /dev/null
+++ b/src/mongo/db/default_baton.h
@@ -0,0 +1,78 @@
+
+/**
+ *    Copyright (C) 2019-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    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
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    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 Server Side 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 <vector>
+
+#include "mongo/db/baton.h"
+#include "mongo/stdx/condition_variable.h"
+#include "mongo/stdx/mutex.h"
+#include "mongo/util/functional.h"
+
+namespace mongo {
+
+class OperationContext;
+
+/**
+ * The most basic Baton implementation.
+ */
+class DefaultBaton : public Baton {
+public:
+    explicit DefaultBaton(OperationContext* opCtx);
+
+    ~DefaultBaton();
+
+    void markKillOnClientDisconnect() noexcept override;
+
+    void schedule(unique_function<void(OperationContext*)> func) noexcept override;
+
+    void notify() noexcept override;
+
+    Waitable::TimeoutState run_until(ClockSource* clkSource, Date_t oldDeadline) noexcept override;
+
+    void run(ClockSource* clkSource) noexcept override;
+
+private:
+    void detachImpl() noexcept override;
+
+    stdx::mutex _mutex;
+    stdx::condition_variable _cv;
+    bool _notified = false;
+    bool _sleeping = false;
+
+    OperationContext* _opCtx;
+
+    bool _hasIngressSocket = false;
+
+    std::vector<unique_function<void(OperationContext*)>> _scheduled;
+};
+
+}  // namespace mongo