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Messages sent based on a assigned priority Higher priority messages gets preference over lower priority ones Add environment variable for setting high water mark for zmq
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /** | ||
| * Copyright (c) 2015 by Contributors | ||
| */ | ||
| #ifndef PS_INTERNAL_THREADSAFE_PQUEUE_H_ | ||
| #define PS_INTERNAL_THREADSAFE_PQUEUE_H_ | ||
| #include <queue> | ||
| #include <mutex> | ||
| #include <condition_variable> | ||
| #include <memory> | ||
| #include <utility> | ||
| #include <vector> | ||
| #include "ps/base.h" | ||
| namespace ps { | ||
|
|
||
| /** | ||
| * \brief thread-safe queue allowing push and waited pop | ||
| */ | ||
| class ThreadsafePQueue { | ||
| public: | ||
| ThreadsafePQueue() { } | ||
| ~ThreadsafePQueue() { } | ||
|
|
||
| /** | ||
| * \brief push an value into the end. threadsafe. | ||
| * \param new_value the value | ||
| */ | ||
| void Push(Message new_value) { | ||
| mu_.lock(); | ||
| queue_.push(std::move(new_value)); | ||
| mu_.unlock(); | ||
| cond_.notify_all(); | ||
| } | ||
|
|
||
| /** | ||
| * \brief wait until pop an element from the beginning, threadsafe | ||
| * \param value the poped value | ||
| */ | ||
| void WaitAndPop(Message* value) { | ||
| std::unique_lock<std::mutex> lk(mu_); | ||
| cond_.wait(lk, [this]{return !queue_.empty();}); | ||
| *value = std::move(queue_.top()); | ||
| queue_.pop(); | ||
| } | ||
|
|
||
| private: | ||
| class Compare { | ||
| public: | ||
| bool operator()(const Message &l, const Message &r) { | ||
| return l.meta.priority <= r.meta.priority; | ||
| } | ||
| }; | ||
| mutable std::mutex mu_; | ||
| std::priority_queue<Message, std::vector<Message>, Compare> queue_; | ||
| std::condition_variable cond_; | ||
| }; | ||
|
|
||
| } // namespace ps | ||
|
|
||
| #endif // PS_INTERNAL_THREADSAFE_PQUEUE_H_ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,60 @@ | ||
| /** | ||
| * Copyright (c) 2015 by Contributors | ||
| */ | ||
| #ifndef PS_P3_VAN_H_ | ||
| #define PS_P3_VAN_H_ | ||
| #include <memory> | ||
| namespace ps { | ||
|
|
||
| /** | ||
| * \brief P3 based Van implementation | ||
| */ | ||
| class P3Van : public ZMQVan { | ||
| public: | ||
| P3Van() {} | ||
| virtual ~P3Van() {} | ||
|
|
||
| protected: | ||
| void Start(int customer_id) override { | ||
| start_mu_.lock(); | ||
| if (init_stage == 0) { | ||
| // start sender | ||
| sender_thread_ = std::unique_ptr<std::thread>( | ||
| new std::thread(&P3Van::Sending, this)); | ||
| init_stage++; | ||
| } | ||
| start_mu_.unlock(); | ||
| ZMQVan::Start(customer_id); | ||
| } | ||
|
|
||
| void Stop() override { | ||
| ZMQVan::Stop(); | ||
| sender_thread_->join(); | ||
| } | ||
|
|
||
| int SendMsg(const Message& msg) override { | ||
| send_queue_.Push(msg); | ||
| return 0; | ||
| } | ||
|
|
||
| void Sending() { | ||
| while (true) { | ||
| Message msg; | ||
| send_queue_.WaitAndPop(&msg); | ||
| ZMQVan::SendMsg(msg); | ||
| if (!msg.meta.control.empty() && | ||
| msg.meta.control.cmd == Control::TERMINATE) { | ||
| break; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private: | ||
| /** the thread for sending messages */ | ||
| std::unique_ptr<std::thread> sender_thread_; | ||
| ThreadsafePQueue send_queue_; | ||
| int init_stage = 0; | ||
| }; | ||
| } // namespace ps | ||
|
|
||
| #endif // PS_P3_VAN_H_ |
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