eventmachine: add app.deferred?(env) support as middleware

Merb (and possibly other) frameworks that support conditionally
deferred app dispatch can now use it just like Ebb and Thin.

http://brainspl.at/articles/2008/04/18/deferred-requests-with-merb-ebb-and-thin

1 files changed, 22 insertions, 0 deletions

diff --git a/t/app_deferred.ru b/t/app_deferred.ru
new file mode 100644
index 0000000..179ac95
--- /dev/null
+++ b/t/app_deferred.ru
@@ -0,0 +1,22 @@
+#\-E none
+# can't use non-compatible middleware that doesn't pass "deferered?" calls
+#
+# used for testing deferred actions for Merb and possibly other frameworks
+# ref: http://brainspl.at/articles/2008/04/18/deferred-requests-with-merb-ebb-and-thin
+
+class DeferredApp < Struct.new(:app)
+  def deferred?(env)
+    env["PATH_INFO"] == "/deferred"
+  end
+
+  def call(env)
+    body = "#{Thread.current.inspect}\n"
+    headers = {
+      "Content-Type" => "text/plain",
+      "Content-Length" => body.size.to_s,
+    }
+    [ 200, headers, [ body ] ]
+  end
+end
+
+run DeferredApp.new