| // Copyright 2012, 2013 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry5.internal.services.javascript; |
| |
| import org.apache.tapestry5.SymbolConstants; |
| import org.apache.tapestry5.dom.Element; |
| import org.apache.tapestry5.internal.services.assets.ResourceChangeTracker; |
| import org.apache.tapestry5.ioc.Messages; |
| import org.apache.tapestry5.ioc.Resource; |
| import org.apache.tapestry5.ioc.annotations.PostInjection; |
| import org.apache.tapestry5.ioc.annotations.Symbol; |
| import org.apache.tapestry5.ioc.internal.util.CollectionFactory; |
| import org.apache.tapestry5.json.JSONArray; |
| import org.apache.tapestry5.json.JSONLiteral; |
| import org.apache.tapestry5.json.JSONObject; |
| import org.apache.tapestry5.services.AssetSource; |
| import org.apache.tapestry5.services.ResponseCompressionAnalyzer; |
| import org.apache.tapestry5.services.assets.AssetPathConstructor; |
| import org.apache.tapestry5.services.assets.StreamableResourceSource; |
| import org.apache.tapestry5.services.javascript.JavaScriptModuleConfiguration; |
| import org.apache.tapestry5.services.javascript.ModuleConfigurationCallback; |
| import org.apache.tapestry5.services.javascript.ModuleManager; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Set; |
| |
| public class ModuleManagerImpl implements ModuleManager |
| { |
| |
| private final ResponseCompressionAnalyzer compressionAnalyzer; |
| |
| private final Messages globalMessages; |
| |
| private final boolean compactJSON; |
| |
| private final Map<String, Resource> shimModuleNameToResource = CollectionFactory.newMap(); |
| |
| private final Resource classpathRoot; |
| |
| private final Set<String> extensions; |
| |
| // Note: ConcurrentHashMap does not support null as a value, alas. We use classpathRoot as a null. |
| private final Map<String, Resource> cache = CollectionFactory.newConcurrentMap(); |
| |
| private final JSONObject baseConfig; |
| |
| private final AssetPathConstructor assetPathConstructor; |
| |
| public ModuleManagerImpl(ResponseCompressionAnalyzer compressionAnalyzer, |
| AssetSource assetSource, |
| Map<String, JavaScriptModuleConfiguration> configuration, |
| Messages globalMessages, |
| StreamableResourceSource streamableResourceSource, |
| @Symbol(SymbolConstants.COMPACT_JSON) |
| boolean compactJSON, |
| @Symbol(SymbolConstants.PRODUCTION_MODE) |
| boolean productionMode, |
| AssetPathConstructor assetPathConstructor) |
| { |
| this.compressionAnalyzer = compressionAnalyzer; |
| this.globalMessages = globalMessages; |
| this.compactJSON = compactJSON; |
| this.assetPathConstructor = assetPathConstructor; |
| |
| classpathRoot = assetSource.resourceForPath(""); |
| extensions = CollectionFactory.newSet("js"); |
| |
| extensions.addAll(streamableResourceSource.fileExtensionsForContentType("text/javascript")); |
| |
| baseConfig = buildBaseConfig(configuration, !productionMode); |
| } |
| |
| private String buildRequireJSConfig(List<ModuleConfigurationCallback> callbacks) |
| { |
| // This is the part that can vary from one request to another, based on the capabilities of the client. |
| JSONObject config = baseConfig.copy().put("baseUrl", getBaseURL()); |
| |
| // TAP5-2196: allow changes to the configuration in a per-request basis. |
| for (ModuleConfigurationCallback callback : callbacks) |
| { |
| config = callback.configure(config); |
| assert config != null; |
| } |
| |
| // This part gets written out before any libraries are loaded (including RequireJS). |
| return String.format("var require = %s;\n", config.toString(compactJSON)); |
| } |
| |
| private JSONObject buildBaseConfig(Map<String, JavaScriptModuleConfiguration> configuration, boolean devMode) |
| { |
| JSONObject config = new JSONObject(); |
| |
| // In DevMode, wait up to five minutes for a script, as the developer may be using the debugger. |
| if (devMode) |
| { |
| config.put("waitSeconds", 300); |
| } |
| |
| for (String name : configuration.keySet()) |
| { |
| JavaScriptModuleConfiguration module = configuration.get(name); |
| |
| shimModuleNameToResource.put(name, module.resource); |
| |
| // Some modules (particularly overrides) just need an alternate location for their content |
| // on the server. |
| if (module.getNeedsConfiguration()) |
| { |
| // Others are libraries being shimmed as AMD modules, and need some configuration |
| // to ensure that everything hooks up properly on the client. |
| addModuleToConfig(config, name, module); |
| } |
| } |
| return config; |
| } |
| |
| private String getBaseURL() |
| { |
| return assetPathConstructor.constructAssetPath("module", compressionAnalyzer.isGZipSupported()); |
| } |
| |
| private void addModuleToConfig(JSONObject config, String name, JavaScriptModuleConfiguration module) |
| { |
| JSONObject shimConfig = config.in("shim"); |
| |
| boolean nestDependencies = false; |
| |
| String exports = module.getExports(); |
| |
| if (exports != null) |
| { |
| shimConfig.in(name).put("exports", exports); |
| nestDependencies = true; |
| } |
| |
| String initExpression = module.getInitExpression(); |
| |
| if (initExpression != null) |
| { |
| String function = String.format("function() { return %s; }", initExpression); |
| shimConfig.in(name).put("init", new JSONLiteral(function)); |
| nestDependencies = true; |
| } |
| |
| List<String> dependencies = module.getDependencies(); |
| |
| if (dependencies != null) |
| { |
| JSONObject container = nestDependencies ? shimConfig.in(name) : shimConfig; |
| String key = nestDependencies ? "deps" : name; |
| |
| for (String dep : dependencies) |
| { |
| container.append(key, dep); |
| } |
| } |
| } |
| |
| @PostInjection |
| public void setupInvalidation(ResourceChangeTracker tracker) |
| { |
| tracker.clearOnInvalidation(cache); |
| } |
| |
| public void writeConfiguration(Element body, |
| List<ModuleConfigurationCallback> callbacks) |
| { |
| Element element = body.element("script", "type", "text/javascript"); |
| |
| // Build it each time because we don't know if the client supports GZip or not, and |
| // (in development mode) URLs for some referenced assets could change (due to URLs |
| // containing a checksum on the resource content). |
| element.raw(buildRequireJSConfig(callbacks)); |
| } |
| |
| public void writeInitialization(Element body, List<String> libraryURLs, List<?> inits) |
| { |
| |
| Element element = body.element("script", "type", "text/javascript"); |
| |
| element.raw(globalMessages.format("core-page-initialization-template", |
| convert(libraryURLs), |
| convert(inits))); |
| } |
| |
| private String convert(List<?> input) |
| { |
| return new JSONArray().putAll(input).toString(compactJSON); |
| } |
| |
| public Resource findResourceForModule(String moduleName) |
| { |
| Resource resource = cache.get(moduleName); |
| |
| if (resource == null) |
| { |
| resource = resolveModuleNameToResource(moduleName); |
| cache.put(moduleName, resource); |
| } |
| |
| // We're treating classpathRoot as a placeholder for null. |
| |
| return resource == classpathRoot ? null : resource; |
| } |
| |
| private Resource resolveModuleNameToResource(String moduleName) |
| { |
| Resource resource = shimModuleNameToResource.get(moduleName); |
| |
| if (resource != null) |
| { |
| return resource; |
| } |
| |
| // Tack on a fake extension; otherwise modules whose name includes a '.' get mangled |
| // by Resource.withExtension(). |
| String baseName = String.format("/META-INF/modules/%s.EXT", moduleName); |
| |
| Resource baseResource = classpathRoot.forFile(baseName); |
| |
| for (String extension : extensions) |
| { |
| resource = baseResource.withExtension(extension); |
| |
| if (resource.exists()) |
| { |
| return resource; |
| } |
| } |
| |
| // Return placeholder for null: |
| return classpathRoot; |
| } |
| } |