The Channel constructor now throws an exception if the max number of channels has been reached

include/amqpcpp/channel.h

@@ -31,15 +31,14 @@ public:
      *  Construct a channel object
      * 
      *  The passed in connection pointer must remain valid for the 
-     *  lifetime of the channel.
+     *  lifetime of the channel. Watch out: this method throws an error
+     *  if the channel could not be constructed (for example because the
+     *  max number of AMQP channels has been reached)
      * 
      *  @param  connection
+     *  @throws std::runtime_error
      */
-    Channel(Connection *connection) : _implementation(new ChannelImpl()) 
-    {
-        // attach the connection to the channel
-        _implementation->attach(connection);
-    }
+    Channel(Connection *connection);
     
     /**
      *  Copy'ing of channel objects is not supported

include/amqpcpp/channelimpl.h

@@ -151,8 +151,9 @@ private:
     /**
      *  Attach the connection
      *  @param  connection
+     *  @return bool
      */
-    void attach(Connection *connection);
+    bool attach(Connection *connection);
 
     /**
      *  Push a deferred result

include/amqpcpp/linux_tcp/tcpchannel.h

@@ -27,9 +27,12 @@ public:
      *  Constructor
      * 
      *  The passed in connection pointer must remain valid for the 
-     *  lifetime of the channel.
+     *  lifetime of the channel. A constructor is thrown if the channel 
+     *  cannot be connected (because the connection is already closed or
+     *  because max number of channels has been reached)
      * 
      *  @param  connection
+     *  @throws std::runtime_error
      */
     TcpChannel(TcpConnection *connection) :
         Channel(&connection->_connection) {}

src/channelimpl.cpp

@@ -96,8 +96,9 @@ void ChannelImpl::onError(const ErrorCallback &callback)
 /**
  *  Initialize the object with an connection
  *  @param  connection
+ *  @return bool
  */
-void ChannelImpl::attach(Connection *connection)
+bool ChannelImpl::attach(Connection *connection)
 {
     // get connection impl
     _connection = &connection->_implementation;
@@ -110,6 +111,9 @@ void ChannelImpl::attach(Connection *connection)
     {
         // this is invalid
         _state = state_closed;
+        
+        // failure
+        return false;
     }
     else 
     {
@@ -117,10 +121,13 @@ void ChannelImpl::attach(Connection *connection)
         _state = state_connected;
     
         // send the open frame
-        if (send(ChannelOpenFrame(_id))) return;
+        if (send(ChannelOpenFrame(_id))) return true;
 
-        // report an error
-        reportError("Channel could not be initialized", true);
+        // this is an error
+        _state = state_closed;
+        
+        // report failure
+        return false;
     }
 }