1 files changed, 65 insertions, 0 deletions
diff --git a/qpid/ruby/lib/qpid/invoker.rb b/qpid/ruby/lib/qpid/invoker.rb
new file mode 100644
index 0000000000..39716ac6c2
--- /dev/null
+++ b/qpid/ruby/lib/qpid/invoker.rb
@@ -0,0 +1,65 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+#
+
+class Qpid::Invoker
+
+  # Requires that client defines a invoke method and overrides
+  # resolve_method
+
+  # FIXME: Is it really worth defining methods in method_missing ? We
+  # could just dispatch there directly
+
+  def invc_method(name, resolved)
+    define_singleton_method(name) { |*args| invoke(resolved, args) }
+    # FIXME: the Python code also attaches docs from resolved.pydoc
+  end
+
+  def invc_value(name, resolved)
+    define_singleton_method(name) { | | resolved }
+  end
+
+  def invc_error(name, resolved)
+    msg = "%s instance has no attribute '%s'" % [self.class.name, name]
+    if resolved
+      msg += "\n%s" % resolved
+    end
+    raise NameError, msg
+  end
+
+  def resolve_method(name)
+    invocation(:error, nil)
+  end
+
+  def method_missing(name, *args)
+    disp, resolved = resolve_method(name)
+    disp.call(name, resolved)
+    send(name, *args)
+  end
+
+  def invocation(kind, name = nil)
+    [ method("invc_#{kind}"), name ]
+  end
+
+  private
+  def define_singleton_method(name, &body)
+    singleton_class = class << self; self; end
+    singleton_class.send(:define_method, name, &body)
+  end
+
+end