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1 | =head1 NAME |
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2 | |
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3 | Catalyst::Delta - Overview of changes between versions of Catalyst |
4 | |
5 | =head1 DESCRIPTION |
6 | |
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7 | This is an overview of the user-visible changes to Catalyst between major |
8 | Catalyst releases. |
9 | |
10 | =head2 VERSION 5.90060+ |
11 | |
12 | We changed the way we return body content (from response) to whatever |
13 | Plack handler you are using (Starman, FastCGI, etc.) We no longer |
14 | always use the streaming interface for the cases when the body is a |
15 | simple scalar, object or filehandle like. In those cases we now just |
16 | pass the simple response on to the plack handler. This might lead to |
17 | some minor differences in how streaming is handled. For example, you |
18 | might notice that streaming starts using chunked encoding when running |
19 | on a server that supports that, or that previously missing headers |
20 | (possible content-length) might appear suddenly correct. Also, if you |
21 | are using middleware like L<Plack::Middleware::XSendfile> and are using |
22 | a filehandle that sets a readable path, your server might now correctly |
23 | handle the file (rather than as before where Catalyst would stream it |
24 | very likely very slowly). |
25 | |
26 | In other words, some things might be meaninglessly different and some |
27 | things that were broken codewise but worked because of Catalyst being |
28 | incorrect might suddenly be really broken. The behavior is now more |
29 | correct in that Catalyst plays better with features that Plack offers |
30 | but if you are making heavy use of the streaming interface there could |
31 | be some differences so you should test carefully (this is probably not |
32 | the vast majority of people). In particular if you are developing |
33 | using one server but deploying using a different one, differences in |
34 | what those server do with streaming should be noted. |
35 | |
36 | We also now more carefully distingush the different between a body set |
37 | to '' and a body that is undef. This might lead to situations where |
38 | again you'll get a content-length were you didn't get one before or |
39 | where a supporting server will start chunking output. If this is an |
40 | issue you can apply the middleware L<Plack::Middleware::BufferedStreaming> |
41 | or report specific problems to the dev team. |
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42 | |
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43 | Also, we have started migrating code in Catalyst to equivilent Plack |
44 | Middleware when such exists and is correct to do so. |
45 | |
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46 | =head2 VERSION 5.9XXXX 'cataplack' |
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47 | |
48 | The Catalyst::Engine sub-classes have all been removed and deprecated, |
49 | to be replaced with Plack handlers. |
50 | |
51 | Plack is an implementation of the L<PSGI> specification, which is |
52 | a standard interface between web servers and application frameworks. |
53 | |
54 | This should be no different for developers, and you should not have to |
55 | migrate your applications unless you are using a custom engine already. |
56 | |
57 | This change benefits Catalyst significantly by reducing the amount of |
58 | code inside the framework, and means that the framework gets upstream |
59 | bug fixes in L<Plack>, and automatically gains support for any web server |
60 | which a L<PSGI> compliant handler is written for. |
61 | |
62 | It also allows you more flexibility with your application, and allows |
63 | the use of cross web framework 'middleware'. |
64 | |
65 | Developers are recommended to read L<Catalyst::Upgrading> for notes about |
66 | upgrading, especially if you are using an unusual deployment method. |
67 | |
68 | Documentation for how to take advantage of L<PSGI> can be found in |
69 | L<Catalyst::PSGI>, and information about deploying your application |
70 | has been moved to L<Catalyst::Manual::Deployment>. |
71 | |
72 | =head3 Updated modules: |
73 | |
74 | A number of modules have been updated to pass their tests or not |
75 | produce deprecation warnings with the latest version of Catalyst. |
76 | It is recommended that you upgrade any of these that you are using |
77 | after installing this version of Catalyst. |
78 | |
79 | These extensions are: |
80 | |
81 | =over |
82 | |
83 | =item L<Catalyst::Engine::HTTP::Prefork> |
84 | |
85 | This is now deprecated, see L<Catalyst::Upgrading>. |
86 | |
87 | =item L<Test::WWW::Mechanize::Catalyst> |
88 | |
89 | Has been updated to not produce deprecation warnings, upgrade recommended. |
90 | |
91 | =item Catalyst::ActionRole::ACL |
92 | |
93 | Has been updated to fix failing tests (although older versions still |
94 | function perfectly with this version of Catalyst). |
95 | |
96 | =item Catalyst::Plugin::Session::Store::DBIC |
97 | |
98 | Has been updated to fix failing tests (although older versions still |
99 | function perfectly with this version of Catalyst). |
100 | |
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101 | =item Catalyst::Plugin::Authentication |
102 | |
103 | Has been updated to fix failing tests (although older versions still |
104 | function perfectly with this version of Catalyst). |
105 | |
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106 | =back |
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107 | |
108 | =head1 PREVIOUS VERSIONS |
109 | |
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110 | =head2 VERSION 5.8XXXX 'catamoose' |
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111 | |
112 | =head3 Deprecations |
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113 | |
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114 | Please see L<Catalyst::Upgrading> for a full description of how changes in the |
115 | framework may affect your application. |
116 | |
117 | Below is a brief list of features which have been deprecated in this release: |
118 | |
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119 | =over |
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120 | |
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121 | =item ::[MVC]:: style naming scheme has been deprecated and will warn |
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122 | |
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123 | =item NEXT is deprecated for all applications and components, use MRO::Compat |
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124 | |
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125 | =item Dispatcher methods which are an implementation detail made private, public versions now warn. |
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126 | |
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127 | =item MyApp->plugin method is deprecated, use L<Catalyst::Model::Adaptor> instead. |
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128 | |
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129 | =item __PACKAGE__->mk_accessors() is supported for backward compatibility only, use Moose attributes instead in new code. |
130 | |
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131 | =item Use of Catalyst::Base now warns |
132 | |
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133 | =back |
134 | |
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135 | =head3 New features |
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136 | |
137 | =head3 Dispatcher |
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138 | |
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139 | =over |
140 | |
141 | =item Fix forwarding to Catalyst::Action objects. |
142 | |
143 | =item Add the dispatch_type method |
144 | |
145 | =back |
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146 | |
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147 | =head3 Restarter |
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148 | |
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149 | The development server restarter has been improved to be compatible with |
150 | immutable Moose classes, and also to optionally use |
151 | L<B::Hooks::OP::Check::StashChange> to handle more complex application layouts |
152 | correctly. |
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153 | |
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154 | =head3 $c->uri_for_action method. |
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155 | |
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156 | Give a private path to the Catalyst action you want to create a URI for. |
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157 | |
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158 | =head3 Logging |
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159 | |
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160 | Log levels have been made additive. |
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161 | |
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162 | =head3 L<Catalyst::Test> |
163 | |
164 | =over |
165 | |
166 | =item Change to use L<Sub::Exporter>. |
167 | |
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168 | =item Support mocking multiple virtual hosts |
169 | |
170 | =item New methods like action_ok and action_redirect to write more compact tests |
171 | |
172 | =back |
173 | |
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174 | =head3 Catalyst::Response |
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175 | |
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176 | =over |
177 | |
178 | =item * |
179 | |
180 | New print method which prints @data to the output stream, separated by $,. |
181 | This lets you pass the response object to functions that want to write to an |
182 | L<IO::Handle>. |
183 | |
184 | =item * |
185 | |
186 | Added code method as an alias for C<< $res->status >> |
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187 | |
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188 | =back |
189 | |
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190 | =head3 Consequences of the Moose back end |
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191 | |
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192 | =over |
193 | |
194 | =item * |
195 | |
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196 | Components are fully compatible with Moose, and all Moose features, such as |
197 | method modifiers, attributes, roles, BUILD and BUILDARGS methods are fully |
198 | supported and may be used in components and applications. |
199 | |
200 | =item * |
201 | |
202 | Many reusable extensions which would previously have been plugins or base |
203 | classes are better implemented as Moose roles. |
204 | |
205 | =item * |
206 | |
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207 | L<MooseX::MethodAttributes::Role::AttrContainer::Inheritable> is used to contain action |
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208 | attributes. This means that attributes are represented in the MOP, and |
209 | decouples action creation from attributes. |
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210 | |
211 | =item * |
212 | |
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213 | There is a reasonable API in Catalyst::Controller for working with |
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214 | and registering actions, allowing a controller sub-class to replace |
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215 | subroutine attributes for action declarations with an alternate |
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216 | syntax. |
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217 | |
218 | =item * |
219 | |
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220 | Refactored capturing of $app from L<Catalyst::Controller> into |
221 | L<Catalyst::Component::ApplicationAttribute> for easier reuse in other |
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222 | components. |
223 | |
224 | =item * |
225 | |
226 | Your application class is forced to become immutable at the end of compilation. |
227 | |
228 | =back |
229 | |
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230 | =head3 Bug fixes |
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231 | |
232 | =over |
233 | |
234 | =item * |
235 | |
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236 | Don't ignore SIGCHLD while handling requests with the development server, so that |
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237 | system() and other ways of creating child processes work as expected. |
238 | |
239 | =item * |
240 | |
241 | Fixes for FastCGI when used with IIS 6.0 |
242 | |
243 | =item * |
244 | |
245 | Fix a bug in uri_for which could cause it to generate paths with multiple |
246 | slashes in them. |
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247 | |
248 | =item * |
249 | |
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250 | Fix a bug in Catalyst::Stats, stopping garbage being inserted into |
251 | the stats if a user calls begin => but no end |
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252 | |
253 | =back |
254 | |