refactor: separate handler chain from dispatcher

Handler Chain is  of handlers that respond to call.
Invoking handle(*args) on the chain will call the handlers with the given args
until one of them returns a result that is truethy (i.e. not false or nil).

Extracted from the dispatcher so we can also handle exceptions there in the
future. (So that if one of the network connections to the request_handlers
fails we can continue while still tracking the failed exception.)

1 files changed, 26 insertions, 0 deletions

diff --git a/lib/nickserver/handler_chain.rb b/lib/nickserver/handler_chain.rb
new file mode 100644
index 0000000..a0eba4d
--- /dev/null
+++ b/lib/nickserver/handler_chain.rb
@@ -0,0 +1,26 @@
+#
+# Handler Chain
+#
+# A chain of handlers that respond to call. Invoking handle(*args) on the chain
+# will call the handlers with the given args until one of them returns a result
+# that is truethy (i.e. not false or nil).
+#
+# Extracted from the dispatcher so we can also handle exceptions here in the
+# future.
+#
+
+module Nickserver
+  class HandlerChain
+
+    def initialize(*handlers)
+      @handlers = handlers
+    end
+
+    def handle(*args)
+      result = nil
+      _handled_by = @handlers.find{|h| result = h.call(*args)}
+      result
+    end
+
+  end
+end