i2pd/Queue.h

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#ifndef QUEUE_H__
#define QUEUE_H__
#include <queue>
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#include <vector>
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#include <mutex>
#include <thread>
#include <condition_variable>
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#include <functional>
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namespace i2p
{
namespace util
{
template<typename Element>
class Queue
{
public:
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void Put (Element e)
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{
std::unique_lock<std::mutex> l(m_QueueMutex);
m_Queue.push (e);
m_NonEmpty.notify_one ();
}
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void Put (const std::vector<Element>& vec)
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{
if (!vec.empty ())
{
std::unique_lock<std::mutex> l(m_QueueMutex);
for (auto it: vec)
m_Queue.push (it);
m_NonEmpty.notify_one ();
}
}
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Element GetNext ()
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{
std::unique_lock<std::mutex> l(m_QueueMutex);
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auto el = GetNonThreadSafe ();
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if (!el)
{
m_NonEmpty.wait (l);
el = GetNonThreadSafe ();
}
return el;
}
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Element GetNextWithTimeout (int usec)
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{
std::unique_lock<std::mutex> l(m_QueueMutex);
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auto el = GetNonThreadSafe ();
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if (!el)
{
m_NonEmpty.wait_for (l, std::chrono::milliseconds (usec));
el = GetNonThreadSafe ();
}
return el;
}
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void Wait ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
m_NonEmpty.wait (l);
}
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bool Wait (int sec, int usec)
{
std::unique_lock<std::mutex> l(m_QueueMutex);
return m_NonEmpty.wait_for (l, std::chrono::seconds (sec) + std::chrono::milliseconds (usec)) != std::cv_status::timeout;
}
bool IsEmpty ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
return m_Queue.empty ();
}
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int GetSize ()
{
std::unique_lock<std::mutex> l(m_QueueMutex);
return m_Queue.size ();
}
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void WakeUp () { m_NonEmpty.notify_all (); };
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Element Get ()
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{
std::unique_lock<std::mutex> l(m_QueueMutex);
return GetNonThreadSafe ();
}
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Element Peek ()
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{
std::unique_lock<std::mutex> l(m_QueueMutex);
return GetNonThreadSafe (true);
}
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private:
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Element GetNonThreadSafe (bool peek = false)
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{
if (!m_Queue.empty ())
{
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auto el = m_Queue.front ();
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if (!peek)
m_Queue.pop ();
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return el;
}
return nullptr;
}
private:
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std::queue<Element> m_Queue;
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std::mutex m_QueueMutex;
std::condition_variable m_NonEmpty;
};
template<class Msg>
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class MsgQueue: public Queue<Msg *>
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{
public:
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typedef std::function<void()> OnEmpty;
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MsgQueue (): m_IsRunning (true), m_Thread (std::bind (&MsgQueue<Msg>::Run, this)) {};
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~MsgQueue () { Stop (); };
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void Stop()
{
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if (m_IsRunning)
{
m_IsRunning = false;
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Queue<Msg *>::WakeUp ();
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m_Thread.join();
}
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}
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void SetOnEmpty (OnEmpty const & e) { m_OnEmpty = e; };
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private:
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void Run ()
{
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while (m_IsRunning)
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{
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while (auto msg = Queue<Msg *>::Get ())
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{
msg->Process ();
delete msg;
}
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if (m_OnEmpty != nullptr)
m_OnEmpty ();
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if (m_IsRunning)
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Queue<Msg *>::Wait ();
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}
}
private:
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volatile bool m_IsRunning;
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OnEmpty m_OnEmpty;
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std::thread m_Thread;
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};
}
}
#endif