added Channel implementation file (fixes #267)

src/channel.cpp

@@ -0,0 +1,49 @@
+/**
+ *  Channel.cpp
+ *
+ *  Implementation file for the Channel class
+ *
+ *  @author Emiel Bruijntjes <emiel.bruijntjes@copernica.com>
+ *  @copyright 2018 Copernica BV
+ */
+
+/**
+ *  Dependencies
+ */
+#include "includes.h"
+
+/**
+ *  Begin of namespace
+ */
+namespace AMQP {
+
+/**
+ *  Construct a channel object
+ * 
+ *  The passed in connection pointer must remain valid for the 
+ *  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::Channel(Connection *connection) : _implementation(new ChannelImpl())
+{
+    // check if the connection is indeed usable
+    if (!connection->usable()) throw std::runtime_error("failed to open channel: connection is not active");
+    
+    // attach to the connection
+    if (_implementation->attach(connection)) return;
+    
+    // this failed, max number of channels has been reached
+    throw std::runtime_error("failed to open channel: max number of channels has been reached");
+}
+
+/**
+ *  End of namespace
+ */
+}
+
+
+