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# 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.
# @private
module Qpid::Proton
module Handler
def self.handler_method?(method) /^on_/ =~ name; end
# Handler for an array of handlers of uniform type, with non-conflicting options
class ArrayHandler
def initialize(handlers)
raise "empty handler array" if handlers.empty?
adapters = (handlers.map { |h| Adapter.adapter(h) }).uniq
raise "handler array not uniform, adapters requested: #{adapters}" if adapters.size > 1
@proton_adapter_class = adapters[0]
@methods = Set.new
handlers.each do |h|
@methods.merge(h.methods.select { |m| handler_method? m }) # Collect handler methods
end
end
attr_reader :options, :proton_adapter_class
def method_missing(name, *args)
if respond_to_missing?(name)
@adapters.each { |a| a.__send__(name, *args) if a.respond_to? name}
else
super
end
end
def respond_to_missing?(name, private=false); @methods.include?(name); end
def respond_to?(name, all=false) super || respond_to_missing?(name); end # For ruby < 1.9.2
end
# Base adapter for raw proton events
class Adapter
def initialize(h) @handler = h; end
# Create and return an adapter for handler, or return h if it does not need adapting.
def self.adapt(handler)
return unless handler
a = Array(handler)
h = (a.size == 1) ? a[0] : ArrayHandler.new(a)
ac = adapter(h)
ac ? ac.new(h) : h
end
# Adapter class if requested by handler, else default to MessagingHandler
def self.adapter(handler)
handler.respond_to?(:proton_adapter_class) ? handler.proton_adapter_class : MessagingAdapter
end
def proton_adapter_class() nil; end # Adapters don't need adapting
def forward(method, *args)
(@handler.__send__(method, *args); true) if @handler.respond_to? method
end
end
end
end
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