From a1c7d68b05f142322a190b450971d27c076310a9 Mon Sep 17 00:00:00 2001
From: Azul <azul@riseup.net>
Date: Mon, 19 Sep 2016 09:51:38 +0200
Subject: 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.)
---
 lib/nickserver/handler_chain.rb | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
 create mode 100644 lib/nickserver/handler_chain.rb

(limited to 'lib/nickserver/handler_chain.rb')

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
-- 
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