refactor to more idiomatic RAII

* FairMQTransportFactoryZMQ: move the config invariant
    initialization to ctor
  * FairMQChannel: add new ctor that creates usable channel
  * FairMQSocket*: close sockets in dtor
  * FairMQTransportFactory*: terminate context in dtor
  * FairMQChannel: add Bind/Connect facades (for explicit control, e.g. timing)

fairmq/FairMQChannel.cxx

@@ -75,6 +75,31 @@ FairMQChannel::FairMQChannel(const string& type, const string& method, const str
 {
 }
 
+FairMQChannel::FairMQChannel(const string& name, const string& type, std::shared_ptr<FairMQTransportFactory> factory)
+    : fSocket(factory->CreateSocket(type, name, name)) // TODO whats id and whats name?
+    , fType(type)
+    , fMethod("unspecified")
+    , fAddress("unspecified")
+    , fTransport("default") // TODO refactor, either use string representation or enum type
+    , fSndBufSize(1000)
+    , fRcvBufSize(1000)
+    , fSndKernelSize(0)
+    , fRcvKernelSize(0)
+    , fRateLogging(1)
+    , fName(name)
+    , fIsValid(false)
+    , fPoller(nullptr)
+    , fChannelCmdSocket(nullptr)
+    , fTransportType(factory->GetType())
+    , fTransportFactory(factory)
+    , fNoBlockFlag(0)
+    , fSndMoreFlag(0)
+    , fMultipart(false)
+    , fModified(true)
+    , fReset(false)
+{
+}
+
 FairMQChannel::FairMQChannel(const FairMQChannel& chan)
     : fSocket(nullptr)
     , fType(chan.fType)

fairmq/FairMQChannel.h

@@ -42,6 +42,12 @@ class FairMQChannel
     /// @param address Network address to bind/connect to (e.g. "tcp://127.0.0.1:5555" or "ipc://abc")
     FairMQChannel(const std::string& type, const std::string& method, const std::string& address);
 
+    /// Constructor
+    /// @param name Channel name
+    /// @param type Socket type (push/pull/pub/sub/spub/xsub/pair/req/rep/dealer/router/)
+    /// @param factory TransportFactory
+    FairMQChannel(const std::string& name, const std::string& type, std::shared_ptr<FairMQTransportFactory> factory);
+
     /// Copy Constructor
     FairMQChannel(const FairMQChannel&);
 
@@ -53,6 +59,20 @@ class FairMQChannel
 
     FairMQSocket const & GetSocket() const;
 
+    auto Bind(const std::string& address) -> bool
+    {
+        fMethod = "bind";
+        fAddress = address;
+        return fSocket->Bind(address);
+    }
+
+    auto Connect(const std::string& address) -> void
+    {
+        fMethod = "connect";
+        fAddress = address;
+        return fSocket->Connect(address);
+    }
+
     /// Get channel name
     /// @return Returns full channel name (e.g. "data[0]")
     std::string GetChannelName() const;

fairmq/FairMQDevice.cxx

@@ -1235,45 +1235,7 @@ void FairMQDevice::Exit()
         t.second->Shutdown();
     }
 
-    LOG(DEBUG) << "Closing sockets...";
-
-    // iterate over the channels
-    for (auto& c : fChannels)
-    {
-        // iterate over the sub-channels
-        for (auto& sc : c.second)
-        {
-            if (sc.fSocket)
-            {
-                sc.fSocket->Close();
-                sc.fSocket = nullptr;
-            }
-            if (sc.fChannelCmdSocket)
-            {
-                sc.fChannelCmdSocket->Close();
-                sc.fChannelCmdSocket = nullptr;
-            }
-            if (sc.fPoller)
-            {
-                sc.fPoller = nullptr;
-            }
-        }
-    }
-
-    for (auto& s : fDeviceCmdSockets)
-    {
-        s.second->Close();
-    }
-
-    LOG(DEBUG) << "Closed all sockets!";
-
-    // ask transports to terminate
-    for (const auto& t : fTransports)
-    {
-        t.second->Terminate();
-    }
-
-    LOG(DEBUG) << "All transports exited.";
+    LOG(DEBUG) << "All transports are shut down.";
 }
 
 FairMQDevice::~FairMQDevice()

fairmq/FairMQDevice.h

@@ -301,9 +301,6 @@ class FairMQDevice : public FairMQStateMachine, public FairMQConfigurable
     /// @param rhs Left hand side value for comparison
     static bool SortSocketsByAddress(const FairMQChannel &lhs, const FairMQChannel &rhs);
 
-    std::unordered_map<std::string, std::vector<FairMQChannel>> fChannels; ///< Device channels
-    FairMQProgOptions* fConfig; ///< Program options configuration
-
     template<class T>
     void OnData(const std::string& channelName, bool (T::* memberFunction)(FairMQMessagePtr& msg, int index))
     {
@@ -340,6 +337,14 @@ class FairMQDevice : public FairMQStateMachine, public FairMQConfigurable
 
     bool Terminated();
 
+  protected:
+    std::shared_ptr<FairMQTransportFactory> fTransportFactory; ///< Transport factory
+    std::unordered_map<FairMQ::Transport, std::shared_ptr<FairMQTransportFactory>> fTransports; ///< Container for transports
+
+  public:
+    std::unordered_map<std::string, std::vector<FairMQChannel>> fChannels; ///< Device channels
+    FairMQProgOptions* fConfig; ///< Program options configuration
+
   protected:
     std::string fId; ///< Device ID
     std::string fNetworkInterface; ///< Network interface to use for dynamic binding
@@ -352,8 +357,6 @@ class FairMQDevice : public FairMQStateMachine, public FairMQConfigurable
     int fPortRangeMin; ///< Minimum value for the port range (if dynamic)
     int fPortRangeMax; ///< Maximum value for the port range (if dynamic)
 
-    std::shared_ptr<FairMQTransportFactory> fTransportFactory; ///< Transport factory
-    std::unordered_map<FairMQ::Transport, std::shared_ptr<FairMQTransportFactory>> fTransports; ///< Container for transports
     std::unordered_map<FairMQ::Transport, FairMQSocketPtr> fDeviceCmdSockets; ///< Sockets used for the internal unblocking mechanism
 
     /// Additional user initialization (can be overloaded in child classes). Prefer to use InitTask().

fairmq/nanomsg/FairMQTransportFactoryNN.cxx

@@ -80,3 +80,8 @@ FairMQ::Transport FairMQTransportFactoryNN::GetType() const
 {
     return fTransportType;
 }
+
+FairMQTransportFactoryNN::~FairMQTransportFactoryNN()
+{
+    Terminate();
+}

fairmq/nanomsg/FairMQTransportFactoryNN.h

@@ -27,6 +27,7 @@ class FairMQTransportFactoryNN : public FairMQTransportFactory
 {
   public:
     FairMQTransportFactoryNN();
+    ~FairMQTransportFactoryNN() override;
 
     void Initialize(const FairMQProgOptions* config) override;
 
@@ -45,8 +46,6 @@ class FairMQTransportFactoryNN : public FairMQTransportFactory
     void Shutdown() override;
     void Terminate() override;
 
-    ~FairMQTransportFactoryNN() override {};
-
   private:
     static FairMQ::Transport fTransportType;
 };

fairmq/shmem/FairMQSocketSHM.cxx

@@ -627,4 +627,5 @@ int FairMQSocketSHM::GetConstant(const string& constant)
 
 FairMQSocketSHM::~FairMQSocketSHM()
 {
+    Close();
 }

fairmq/shmem/FairMQTransportFactorySHM.cxx

@@ -228,3 +228,7 @@ FairMQ::Transport FairMQTransportFactorySHM::GetType() const
     return fTransportType;
 }
 
+FairMQTransportFactorySHM::~FairMQTransportFactorySHM()
+{
+    Terminate();
+}

fairmq/shmem/FairMQTransportFactorySHM.h

@@ -45,7 +45,7 @@ class FairMQTransportFactorySHM : public FairMQTransportFactory
 
     void SendHeartbeats();
 
-    ~FairMQTransportFactorySHM() override {};
+    ~FairMQTransportFactorySHM() override;
 
   private:
     static FairMQ::Transport fTransportType;

fairmq/zeromq/FairMQSocketZMQ.cxx

@@ -565,4 +565,5 @@ int FairMQSocketZMQ::GetConstant(const string& constant)
 
 FairMQSocketZMQ::~FairMQSocketZMQ()
 {
+    Close();
 }

fairmq/zeromq/FairMQTransportFactoryZMQ.cxx

@@ -33,6 +33,11 @@ FairMQTransportFactoryZMQ::FairMQTransportFactoryZMQ()
         LOG(ERROR) << "failed creating context, reason: " << zmq_strerror(errno);
         exit(EXIT_FAILURE);
     }
+
+    if (zmq_ctx_set(fContext, ZMQ_MAX_SOCKETS, 10000) != 0)
+    {
+        LOG(ERROR) << "failed configuring context, reason: " << zmq_strerror(errno);
+    }
 }
 
 void FairMQTransportFactoryZMQ::Initialize(const FairMQProgOptions* config)
@@ -51,12 +56,6 @@ void FairMQTransportFactoryZMQ::Initialize(const FairMQProgOptions* config)
     {
         LOG(ERROR) << "failed configuring context, reason: " << zmq_strerror(errno);
     }
-
-    // Set the maximum number of allowed sockets on the context.
-    if (zmq_ctx_set(fContext, ZMQ_MAX_SOCKETS, 10000) != 0)
-    {
-        LOG(ERROR) << "failed configuring context, reason: " << zmq_strerror(errno);
-    }
 }
 
 FairMQMessagePtr FairMQTransportFactoryZMQ::CreateMessage() const
@@ -130,3 +129,8 @@ void FairMQTransportFactoryZMQ::Terminate()
         LOG(ERROR) << "shmem: Terminate(): context now available for shutdown";
     }
 }
+
+FairMQTransportFactoryZMQ::~FairMQTransportFactoryZMQ()
+{
+    Terminate();
+}

fairmq/zeromq/FairMQTransportFactoryZMQ.h

@@ -27,6 +27,7 @@ class FairMQTransportFactoryZMQ : public FairMQTransportFactory
 {
   public:
     FairMQTransportFactoryZMQ();
+    ~FairMQTransportFactoryZMQ() override;
 
     void Initialize(const FairMQProgOptions* config) override;
 
@@ -45,8 +46,6 @@ class FairMQTransportFactoryZMQ : public FairMQTransportFactory
     void Shutdown() override;
     void Terminate() override;
 
-    ~FairMQTransportFactoryZMQ() override {};
-
   private:
     static FairMQ::Transport fTransportType;
     void* fContext;