THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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Service Configurations
This is an area of Tapestry IoC that is often least well understood. Tapestry services often must have some configuration to fine tune exactly what they do. One of the interactions between modules is that these service configurations are shared: they may be contributed into by any module.
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One of Tapestry's features is the ability to package assets (images, style sheets, javascript JavaScript libraries, etc.) inside JAR files and expose those to the client. For example, an application URL /assets/org/example/mylib/mylib.js would refer to a file, myllib.js, stored on the classpath in the /org/example/mylib folder.
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public static void contributeResourceDigestGenerator(Configuration<String>Configuration<String> configuration) { configuration.add("class"); configuration.add("tml"); } |
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public class MyAppModule { public static void contributeResourceDigestGenerator(Configuration<String>Configuration<String> configuration) { configuration.add("pgp"); } } |
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public class ResourceDigestGeneratorImpl implements ResourceDigestGenerator { private final Set<String>Set<String> digestExtensions; public ResourceDigestGeneratorImpl(Collection<String>Collection<String> configuration) { digestExtensions = new HashSet<String>HashSet<String>(configuration); } . . . } |
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These kinds of unordered configurations are surprisingly rare in Tapestry (the only other notable one is for the TypeCoercer service). However, as you can see, setting up such a configuration is quite easy.
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public void contributeMasterDispatcher(OrderedConfiguration<Dispatcher>OrderedConfiguration<Dispatcher> configuration, . . .) { // Looks for the root path and renders the start page configuration.add("RootPath", new RootPathDispatcher(. . .), "before:Asset"); // This goes first because an asset to be streamed may have an file extension, such as // ".html", that will confuse the later dispatchers. configuration.add( "Asset", new AssetDispatcher(. . .), "before:PageRender"); configuration.add("PageRender", new PageRenderDispatcher(. . .)); configuration.add("ComponentAction", new ComponentActionDispatcher(. . .), "after:PageRender"); } |
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public static Dispatcher buildMasterDispatcher(List<Dispatcher>List<Dispatcher> configuration, ChainBuilder chainBuilder) { return chainBuilder.build(Dispatcher.class, configuration); } |
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Tapestry IoC's symbol mechanism allows configuration values to be defined and perhaps overridden, then provided to services via injection, using the @Value annotation.
The first step is to contribute values.
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public static void contributeFactoryDefaults(MappedConfiguration<StringMappedConfiguration<String, String>String> configuration) { configuration.add(SymbolConstants.FILE_CHECK_INTERVAL, "1000"); // 1 second configuration.add(SymbolConstants.FILE_CHECK_UPDATE_TIMEOUT, "50"); // 50 milliseconds configuration.add(SymbolConstants.SUPPORTED_LOCALES, "en"); configuration.add("tapestry.default-cookie-max-age", "604800"); // One week configuration.add("tapestry.start-page-name", "start"); configuration.add("tapestry.scriptaculous", "classpath:${tapestry.scriptaculous.path}"); configuration.add( "tapestry.scriptaculous.path", "org/apache/tapestry5/scriptaculous_1_7_1_beta_3"); configuration.add("tapestry.jscalendar.path", "org/apache/tapestry5/jscalendar-1.0"); configuration.add("tapestry.jscalendar", "classpath:${tapestry.jscalendar.path}"); } |
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Mapped configurations don't have to be keyed on Strings (enums or Class are other common key types). When a mapped configuration is keyed on String, then a case-insensitive map is used.
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