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ext/redis-plus-plus-1.3.3/src/sw/redis++/async_sentinel.h

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+/**************************************************************************
+   Copyright (c) 2021 sewenew
+
+   Licensed under the Apache License, Version 2.0 (the "License");
+   you may not use this file except in compliance with the License.
+   You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+ *************************************************************************/
+
+#ifndef SEWENEW_REDISPLUSPLUS_ASYNC_SENTINEL_H
+#define SEWENEW_REDISPLUSPLUS_ASYNC_SENTINEL_H
+
+#include <mutex>
+#include <memory>
+#include <queue>
+#include <condition_variable>
+#include "sentinel.h"
+#include "async_connection.h"
+
+namespace sw {
+
+namespace redis {
+
+class AsyncConnectionPool;
+
+class AsyncSentinel {
+public:
+    explicit AsyncSentinel(const SentinelOptions &sentinel_opts);
+
+    AsyncSentinel(const AsyncSentinel &) = delete;
+    AsyncSentinel& operator=(const AsyncSentinel &) = delete;
+
+    AsyncSentinel(AsyncSentinel &&) = delete;
+    AsyncSentinel& operator=(AsyncSentinel &&) = delete;
+
+    ~AsyncSentinel();
+
+private:
+    friend class SimpleAsyncSentinel;
+
+    struct AsyncSentinelTask {
+        operator bool() const noexcept {
+            return bool(connection);
+        }
+
+        std::weak_ptr<AsyncConnectionPool> pool;
+
+        AsyncConnectionSPtr connection;
+
+        std::string master_name;
+
+        Role role = Role::MASTER;
+    };
+
+    void add(AsyncSentinelTask task);
+
+    void _stop_worker();
+
+    void _run_task(AsyncSentinelTask &task);
+
+    std::queue<AsyncSentinelTask> _fetch_tasks();
+
+    void _run();
+
+    std::queue<AsyncSentinelTask> _tasks;
+
+    std::shared_ptr<Sentinel> _sentinel;
+
+    std::thread _worker;
+
+    std::mutex _mutex;
+
+    std::condition_variable _cv;
+};
+
+using AsyncSentinelSPtr = std::shared_ptr<AsyncSentinel>;
+
+}
+
+}
+
+#endif // end SEWENEW_REDISPLUSPLUS_ASYNC_SENTINEL_H