From 3ae582af7bc496dc31756a8245da9bcfd41e0744 Mon Sep 17 00:00:00 2001
From: Sven Gothel <sgothel@jausoft.com>
Date: Wed, 12 Jan 2022 05:04:32 +0100
Subject: Added `jau::service_runner`, a reusable dedicated thread performing
 custom user services

---
 include/jau/service_runner.hpp | 140 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 include/jau/service_runner.hpp

(limited to 'include/jau/service_runner.hpp')

diff --git a/include/jau/service_runner.hpp b/include/jau/service_runner.hpp
new file mode 100644
index 0000000..867578d
--- /dev/null
+++ b/include/jau/service_runner.hpp
@@ -0,0 +1,140 @@
+/*
+ * Author: Sven Gothel <sgothel@jausoft.com>
+ * Copyright (c) 2022 Gothel Software e.K.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * 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 OR COPYRIGHT HOLDERS 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 JAU_SERVICERUNNER_HPP_
+#define JAU_SERVICERUNNER_HPP_
+
+#include <cstring>
+#include <string>
+#include <cstdint>
+#include <limits>
+#include <atomic>
+#include <memory>
+#include <mutex>
+#include <condition_variable>
+#include <thread>
+#include <algorithm>
+
+#include <jau/cpp_lang_util.hpp>
+#include <jau/basic_types.hpp>
+#include <jau/ordered_atomic.hpp>
+#include <jau/function_def.hpp>
+
+namespace jau {
+
+    /**
+     * Service runner, a reusable dedicated thread performing custom user services.
+     */
+    class service_runner {
+        public:
+            typedef service_runner& service_runner_ref;
+            typedef FunctionDef<void, service_runner_ref> Callback;
+
+        private:
+            std::string name;
+
+            /**
+             * Maximum time in milliseconds to wait for a thread shutdown.
+             */
+            nsize_t service_shutdown_timeout_ms;
+
+            Callback service_work;
+            Callback service_init_locked;
+            Callback service_end_locked;
+            Callback service_end_post_notify;
+
+            jau::sc_atomic_bool shall_stop;
+            jau::sc_atomic_bool running;
+            pthread_t thread_id;
+
+            std::mutex mtx_lifecycle;
+            std::condition_variable cv_init;
+
+            void workerThread();
+
+        public:
+            /**
+             * Service runner constructor.
+             *
+             * start() shall be issued to kick off this service.
+             *
+             * @param name service name
+             * @param service_shutdown_timeout_ms maximum time in milliseconds to wait for a thread shutdown, may be nullptr
+             * @param service_work service working function
+             * @param service_init_locked optional service init function, lifecycle mutex is locked
+             * @param service_end_locked optional service end function, lifecycle mutex is locked
+             * @param service_end_post_notify optional service end function post mutex lock and notify
+             */
+            service_runner(const std::string& name,
+                           const nsize_t service_shutdown_timeout_ms,
+                           Callback service_work,
+                           Callback service_init_locked = Callback(),
+                           Callback service_end_locked = Callback(),
+                           Callback service_end_post_notify = Callback()) noexcept;
+
+            /**
+             * Service runner destructor.
+             *
+             * Issues stop()
+             */
+            ~service_runner() noexcept;
+
+            std::string get_name() const noexcept { return name; }
+            pthread_t get_threadid() const noexcept { return thread_id; }
+
+            bool is_running() const noexcept { return running; }
+            bool get_shall_stop() const noexcept { return shall_stop; }
+
+            /**
+             * Starts this service
+             */
+            void start() noexcept;
+
+            /**
+             * Stops this service
+             *
+             * Method attempts to stop the worker thread
+             * - by flagging `shall stop`
+             * - sending SIGALRM
+             * - waiting until running and not timeout
+             */
+            void stop() noexcept;
+
+            /**
+             * Only marks the worker thread to stop in due process
+             * by flagging `shall stop`.
+             */
+            void set_shall_stop() noexcept { shall_stop = true; }
+
+            /**
+             * Returns a string representation of this service
+             */
+            std::string toString() const noexcept;
+    };
+
+} // namespace jau
+
+
+
+#endif /* JAU_SERVICERUNNER_HPP_ */
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