Author: [email protected]
Date: Mon Apr 6 08:51:55 2009
New Revision: 5187
Modified:
wiki/ClientBundle.wiki
Log:
Edited wiki page through web user interface.
Modified: wiki/ClientBundle.wiki
==============================================================================
--- wiki/ClientBundle.wiki (original)
+++ wiki/ClientBundle.wiki Mon Apr 6 08:51:55 2009
@@ -1,13 +1,110 @@
#summary Compile-time resource optimizations
-TODO(bobv): Copy wiki articles from incubator to here; cross-link the pages
+<wiki:toc />
-= Migrating from ImmutableResourceBundle =
+= Introduction =
+
+ The resources in a deployed GWT application can be roughly categorized
into resources to never cache `.nocache.js`, to cache forever
`.cache.html`, and everything else `myapp.css`. The ClientBundle interface
moves entries in the everything-else category into the cache-forever
category.
+
+= Goals =
+
+ * No more uncertainty if your application is getting the right contents
for program resources.
+ * Decrease non-determinism caused by intermediate proxy servers.
+ * Enable more aggressive caching headers for program resources.
+ * Eliminate mismatches between physical filenames and constants in Java
code by performing consistency checks during the compile.
+ * Use 'data:' URLs, JSON bundles, or other means of embedding resources
in compiled JS when browser- and size-appropriate to decrease the number of
round-trips entirely.
+ * Provide an extensible design for adding new resource types.
+ * Ensure there is no penalty for having multiple ClientBundle resource
functions refer to the same content.
+
+= Non-Goals =
+
+ * To provide a file-system abstraction
+
+= Examples =
+
+To use the ClientBundle, add an inherits tag to your `gwt.xml` file:
+{{{
+<inherits name="com.google.gwt.resources.Resources" />
+}}}
+
+Interfaces:
+{{{
+public interface MyResources extends ClientBundle {
+ public static final MyResources INSTANCE =
GWT.create(MyResources.class);
+
+ @Source("my.css")
+ public CssResource css();
+
+ @Source("config.xml")
+ public TextResource initialConfiguration();
+
+ @Source("manual.pdf")
+ public DataResource ownersManual();
+}
+}}}
+
+You can then say:
+{{{
+ Window.alert(MyResources.INSTANCE.css().getText());
+ new Frame(MyResources.INSTANCE.ownersManual().getURL());
+}}}
+
+= I18N =
+
+ClientBundle is compatible with GWT's I18N module.
+
+Suppose you defined a resource:
+{{{
+...@source("default.txt")
+public TextResource defaultText();
+}}}
+
+For each possible value of the `locale` deferred-binding property, the
ClientBundle generator will look for variations of the specified filename
in a manner similar to that of Java's `ResourceBundle`.
+
+Suppose the `locale` were set to `fr_FR`. The generator would look for
files in the following order:
+ # default_fr_FR.txt
+ # default_fr.txt
+ # default.txt
+
+This will work equally well with all resource types, which can allow you
to provide localized versions of other resources, say `ownersManual_en.pdf`
versus `ownersManual_fr.pdf`.
+
+= Pluggable Resource Generation =
+
+Each subtype of `ResourcePrototype` must define a `...@resourcegenerator`
annotation whose value is a concrete Java class that extends
`ResourceGenerator`. The instance of the `ResourceGenerator` is
responsible for accumulation (or bundling) of incoming resource data as
well as a small degree of code generation to assemble the concrete
implementation of the ClientBundle class. Implementors of
`ResourceGenerator` subclasses can expect that only one `ResourceGenerator`
will be created for a given type of resource within an ClientBundle
interface.
+
+The methods on a `ResourceGenerator` are called in the following order
+ # `init` to provide the `ResourceGenerator` with a `ResourceContext`
+ # `prepare` is called for each `JMethod` the `ResourceGenerator` is
expected to handle
+ # `createFields` allows the `ResourceGenerator` to add code at the class
level
+ # `createAssignment` is called for each `JMethod`. The generated code
should be suitable for use as the right-hand side of an assignment
expression.
+ # `finish` is called after all assignments should have been written.
+
+`ResourceGenerators` are expected to make use of the
`ResourceGeneratorUtil` class.
+
+= Potential pitfalls =
+ * Changing the content of the resources will change the filenames (or
data: encoding), thus forcing a recompile of the GWT application. To avoid
this, the inlining and renaming features can be globally toggled off in
your gwt.xml file during the development phase.
+ * Inlining files into the compiled JS may not make sense if those files
are not always accessed by the program, thus inlining should be
configurable on a per-resource or per-ClientBundle basis.
+
+= Levers and knobs =
+
+ * `ClientBundle.enableInlining` is a deferred-binding property that can
be used to disable the use of `data:` URLs in browsers that would otherwise
support inlining resource data into the compiled JS.
+ * `ClientBundle.enableRenaming` is a configuration property that will
disable the use of strongly-named cache files.
+
+= Resource types =
+
+ * CssResource
+ * DataResource
+ * ExternalTextResource
+ * GwtCreateResource
+ * ImageResource
+ * TextResource
+
+= Migrating from !ImmutableResourceBundle =
== Plan ==
* Expected that incubator IRB system will initially co-exist with
ClientBundle in trunk while integration issues are worked out.
- * Will then change incubator code to be trivial wrappers around trunk
code and add deprecations.
+ * Will then change incubator code to add deprecations.
* No plans to remove types from incubator for _long period of time_.
* No additional features or bug-fixes will be added to incubator APIs.
@@ -23,4 +120,5 @@
* `CssResource.enableMerge` to `CssResource.mergeEnabled`
* `CssResource.forceStrict` to `CssResource.strictAccessors`
* `CssResource.globalPrefix` to `CssResource.obfuscationPrefix`
+ * `CssResource.style` has changed to a configuration property; switch
from `<set-property>` to `<set-configuration-property>` tags to configure
this.
* StyleInjector moved to `com.google.gwt.dom.client` package
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http://groups.google.com/group/Google-Web-Toolkit-Contributors
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