NAME Dancer2::Plugin::Adapter - Wrap any simple class as a service for Dancer2 VERSION version 0.005 SYNOPSIS # in config.yml plugins: Adapter: ua: class: HTTP::Tiny scope: request options: max_redirect: 3 # in your app use Dancer2::Plugin::Adapter; get '/proxy/:url' => sub { my $res = service('ua')->get( params->{'url'} ); if ( $res->{success} ) { return $res->{content}; } else { template 'error' => { response => $res }; } }; DESCRIPTION The problem: you want to use some perl class in your Dancer2 app, but there's no plugin for it. The solution: as long as the class needs only static data to construct an object, then "Dancer2::Plugin::Adaptor" can do the wrapping for you. Think of it as a "just-in-time" plugin (or maybe a poor-man's Bread::Board). Here's another example: you want to send emails via Postmark using WWW::Postmark. In your config.yml, you put this: plugins: Adapter: postmark: class: WWW::Postmark scope: singleton options: POSTMARK_API_TEST In your production config.yml, you can replace 'POSTMARK_API_TEST' with your real Postmark API key. Then, in your application, here's how you use it: get '/' => sub { eval { service("postmark")->send( from => 'me@domain.tld', to => 'you@domain.tld, them@domain.tld', subject => 'an email message', body => "hi guys, what's up?" ); }; return $@ ? "Error: $@" : "Mail sent"; }; "Dancer2::Plugin::Adapter" takes care of constructing and caching the WWW::Postmark object based on the configuration data, and lets you access the object with the "service()" function. CONFIGURATION One or more objects are defined by "NAME => HASHREF" pairs. The hash reference for each NAME must contain a 'class' key, whose value is the class to wrap. The 'scope' key determines how long the generated object persists. The choice of scope will depend on whether the object holds onto any state that should not last across requests. The following scope values are allowed: * "request" -- (default) the object persists in the "vars" hash for the duration of the request * "singleton" -- the objects persists in a private, lexical hash for the duration of the process * "none" -- the object is not cached; a fresh object is created on each call If the hash reference contains an 'options' key, its value will be dereferenced (if it is a hash or array reference) and passed to "new()" when the object is created. Note that if the class requires a reference for the constructor, you have to wrap it in an extra array. E.g. # config.yml: plugins: Adapter: foo: class: Foo::Bar scope: request options: - wibble: wobble biff: boff # constructor called as: Foo::Bar->new( { wibble => wobble, biff => boff } ); If the class does not use 'new' as the name of its constructor, an alternate can be specified with the 'constructor' key. # config.yml: plugins: Adapter: tmpdir: class: File::Temp constructor: newdir # constructor called as: File::Temp->newdir() When caching under "request" scope, Dancer2::Plugin::Adaptor uses the key "_dpa" in the "vars". USAGE service $object = service($name); This function returns the object corresponding to the name defined in the configuration file. The object is created on demand and may be cached for future use based on its "scope" configuration option. SEE ALSO * Dancer2 * Dancer2::Plugin ACKNOWLEDGMENTS Thank you to Matt S. Trout for suggesting the 'scope' controls. SUPPORT Bugs / Feature Requests Please report any bugs or feature requests through the issue tracker at . You will be notified automatically of any progress on your issue. Source Code This is open source software. The code repository is available for public review and contribution under the terms of the license. git clone git://github.com/dagolden/dancer2-plugin-adapter.git AUTHOR David Golden CONTRIBUTOR Blabos de Blebe COPYRIGHT AND LICENSE This software is Copyright (c) 2012 by David Golden. This is free software, licensed under: The Apache License, Version 2.0, January 2004