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| 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "core/dom/ModuleMap.h" |
| 6 |
| 7 #include "core/dom/Modulator.h" |
| 8 #include "core/dom/ModuleScript.h" |
| 9 #include "core/dom/ScriptModuleResolver.h" |
| 10 #include "core/loader/modulescript/ModuleScriptFetchRequest.h" |
| 11 #include "core/loader/modulescript/ModuleScriptLoaderClient.h" |
| 12 #include "platform/WebTaskRunner.h" |
| 13 |
| 14 namespace blink { |
| 15 |
| 16 // Entry struct represents a value in "module map" spec object. |
| 17 class ModuleMap::Entry : public GarbageCollectedFinalized<Entry>, |
| 18 public ModuleScriptLoaderClient { |
| 19 USING_GARBAGE_COLLECTED_MIXIN(ModuleMap::Entry); |
| 20 |
| 21 public: |
| 22 static Entry* create(ModuleMap* map) { return new Entry(map); } |
| 23 virtual ~Entry() {} |
| 24 |
| 25 DECLARE_TRACE(); |
| 26 |
| 27 // Asynchronously notify the client fetched |m_moduleScript|, or register the |
| 28 // client to receive further callbacks if |m_isFetching|. |
| 29 void addClient(SingleModuleClient*); |
| 30 |
| 31 // This is only to be used from ScriptModuleResolver implementations. |
| 32 ModuleScript* retrieveModuleScriptSync() const; |
| 33 |
| 34 private: |
| 35 Entry(ModuleMap*); |
| 36 |
| 37 void dispatchFinishedNotificationAsync(SingleModuleClient*); |
| 38 |
| 39 // Implements ModuleScriptLoaderClient |
| 40 void notifyNewSingleModuleFinished(ModuleScript*) override; |
| 41 |
| 42 Member<ModuleScript> m_moduleScript; |
| 43 Member<ModuleMap> m_map; |
| 44 |
| 45 // Correspond to the HTML spec: "fetching" state. |
| 46 bool m_isFetching = true; |
| 47 |
| 48 HeapHashSet<Member<SingleModuleClient>> m_clients; |
| 49 }; |
| 50 |
| 51 ModuleMap::Entry::Entry(ModuleMap* map) : m_map(map) { |
| 52 DCHECK(m_map); |
| 53 } |
| 54 |
| 55 DEFINE_TRACE(ModuleMap::Entry) { |
| 56 visitor->trace(m_moduleScript); |
| 57 visitor->trace(m_map); |
| 58 visitor->trace(m_clients); |
| 59 } |
| 60 |
| 61 void ModuleMap::Entry::dispatchFinishedNotificationAsync( |
| 62 SingleModuleClient* client) { |
| 63 m_map->modulator()->taskRunner()->postTask( |
| 64 BLINK_FROM_HERE, |
| 65 WTF::bind(&SingleModuleClient::notifyModuleLoadFinished, |
| 66 wrapPersistent(client), wrapPersistent(m_moduleScript.get()))); |
| 67 } |
| 68 |
| 69 void ModuleMap::Entry::addClient(SingleModuleClient* newClient) { |
| 70 DCHECK(!m_clients.contains(newClient)); |
| 71 if (!m_isFetching) { |
| 72 DCHECK(m_clients.isEmpty()); |
| 73 dispatchFinishedNotificationAsync(newClient); |
| 74 return; |
| 75 } |
| 76 |
| 77 m_clients.insert(newClient); |
| 78 } |
| 79 |
| 80 void ModuleMap::Entry::notifyNewSingleModuleFinished( |
| 81 ModuleScript* moduleScript) { |
| 82 m_moduleScript = moduleScript; |
| 83 m_isFetching = false; |
| 84 |
| 85 if (m_moduleScript) { |
| 86 m_map->modulator()->scriptModuleResolver()->registerModuleScript( |
| 87 m_moduleScript); |
| 88 } |
| 89 |
| 90 for (const auto& client : m_clients) { |
| 91 dispatchFinishedNotificationAsync(client); |
| 92 } |
| 93 m_clients.clear(); |
| 94 } |
| 95 |
| 96 ModuleScript* ModuleMap::Entry::retrieveModuleScriptSync() const { |
| 97 DCHECK(!m_isFetching); |
| 98 return m_moduleScript.get(); |
| 99 } |
| 100 |
| 101 ModuleMap::ModuleMap(Modulator* modulator) : m_modulator(modulator) { |
| 102 DCHECK(modulator); |
| 103 } |
| 104 |
| 105 DEFINE_TRACE(ModuleMap) { |
| 106 visitor->trace(m_map); |
| 107 visitor->trace(m_modulator); |
| 108 } |
| 109 |
| 110 void ModuleMap::retrieveAndFetchIfNeeded( |
| 111 const ModuleScriptFetchRequest& request, |
| 112 ModuleGraphLevel level, |
| 113 SingleModuleClient* client) { |
| 114 // https://html.spec.whatwg.org/#fetch-a-single-module-script |
| 115 |
| 116 // Step 1. Let moduleMap be module map settings object's module map. |
| 117 // Note: This is the ModuleMap. |
| 118 |
| 119 // Step 2. If moduleMap[url] is "fetching", wait in parallel until that |
| 120 // entry's value changes, then queue a task on the networking task source to |
| 121 // proceed with running the following steps. |
| 122 MapImpl::AddResult result = m_map.insert(request.url(), nullptr); |
| 123 Member<Entry>& entry = result.storedValue->value; |
| 124 if (result.isNewEntry) { |
| 125 entry = Entry::create(this); |
| 126 |
| 127 // Steps 4-9 loads a new single module script. |
| 128 // Delegate to ModuleScriptLoader via Modulator. |
| 129 m_modulator->fetchNewSingleModule(request, level, entry); |
| 130 } |
| 131 DCHECK(entry); |
| 132 |
| 133 // Step 3. If moduleMap[url] exists, asynchronously complete this algorithm |
| 134 // with moduleMap[url], and abort these steps. |
| 135 // Step 10. Set moduleMap[url] to module script, and asynchronously complete |
| 136 // this algorithm with module script. |
| 137 entry->addClient(client); |
| 138 } |
| 139 |
| 140 ModuleScript* ModuleMap::retrieveFetchedModuleScript(const KURL& url) { |
| 141 MapImpl::iterator it = m_map.find(url); |
| 142 CHECK_NE(it, m_map.end()); |
| 143 return it->value->retrieveModuleScriptSync(); |
| 144 } |
| 145 |
| 146 } // namespace blink |
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