Initial commit.

.gitignore

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+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
+*.bundle
+*.so
+*.o
+*.a
+mkmf.log

.ruby-gemset

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+lazy_object

.ruby-version

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+ruby-2.1

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in lazy_object.gemspec
+gemspec

LICENSE.txt

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+Copyright (c) 2014 Arthur Shagall
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# LazyObject
+
+It's an object wrapper that forwards all calls to the reference target object.
+This object is not created until the first method dispatch.
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+    gem 'lazy_object'
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install lazy_object
+
+## Usage
+
+Pass a block to the initializer, which returns an instance of the target
+object. Lazy object forwards all method calls to the target. The block only
+gets called the first time a method is forwarded.
+
+Example:
+
+```ruby
+lazy = LazyObject.new { VeryExpensiveObject.new }
+# At this point the VeryExpensiveObject hasn't been initialized yet.
+
+# Initializes VeryExpensiveObject and calls 'get_expensive_results' on it, passing in foo and bar
+lazy.get_expensive_results(foo, bar)
+
+# You can pass in blocks to the target.
+lazy.perform_operation do |foo, bar|
+  foo + bar
+end
+```
+
+## Contributing
+
+1. Fork it ( https://github.com/[my-github-username]/lazy_object/fork )
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create a new Pull Request
+6. Make sure all the test pass and your changes have test coverage!

Rakefile

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+require "bundler/gem_tasks"
+

lazy_object.gemspec

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+# coding: utf-8
+lib = File.expand_path('../lib', __FILE__)
+$LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
+require 'lazy_object'
+
+Gem::Specification.new do |spec|
+  spec.name          = "lazy_object"
+  spec.version       = LazyObject.version
+  spec.authors       = ["Arthur Shagall", "Sergey Potapov"]
+  spec.email         = ["[email protected]"]
+  spec.summary       = %q{Lazily initialized object wrapper.}
+  spec.description   = %q{It's an object wrapper that forwards all calls to the reference object. This object is not created until the first method dispatch.}
+  spec.homepage      = ""
+  spec.license       = "MIT"
+
+  spec.files         = `git ls-files -z`.split("\x0")
+  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
+  spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
+  spec.require_paths = ["lib"]
+
+  spec.add_development_dependency "bundler", "~> 1.6"
+  spec.add_development_dependency "rake"
+end

lib/lazy_object.rb

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+# Lazy object wrapper.
+#
+# Pass a block to the initializer, which returns an instance of the target
+# object. Lazy object forwards all method calls to the target. The block only
+# gets called the first time a method is forwarded.
+#
+# Example:
+#
+# lazy = LazyObject.new { VeryExpensiveObject.new } # At this point the VeryExpensiveObject hasn't been initialized yet.
+# lazy.get_expensive_results(foo, bar) # Initializes VeryExpensiveObject and calls 'get_expensive_results' on it, passing in foo and bar
+class LazyObject
+
+  def self.version
+    '0.0.1'
+  end
+
+  def initialize(&callable)
+    @__callable__ = callable
+  end
+
+  # Cached target object.
+  def __target_object__
+    @__target_object__ ||= @__callable__.call
+  end
+
+  # Forwards all method calls to the target object.
+  def method_missing(method_name, *args, &block)
+    __target_object__.send(method_name, *args, &block)
+  end
+end