| // Copyright 2017 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "core/dom/ModuleMap.h" |
| |
| #include "core/dom/Modulator.h" |
| #include "core/dom/ModuleScript.h" |
| #include "core/loader/modulescript/ModuleScriptFetchRequest.h" |
| #include "core/loader/modulescript/ModuleScriptLoaderClient.h" |
| #include "platform/WebTaskRunner.h" |
| |
| namespace blink { |
| |
| // Entry struct represents a value in "module map" spec object. |
| // https://html.spec.whatwg.org/multipage/webappapis.html#module-map |
| class ModuleMap::Entry final : public GarbageCollectedFinalized<Entry>, |
| public TraceWrapperBase, |
| public ModuleScriptLoaderClient { |
| USING_GARBAGE_COLLECTED_MIXIN(ModuleMap::Entry); |
| |
| public: |
| static Entry* Create(ModuleMap* map) { return new Entry(map); } |
| ~Entry() override {} |
| |
| DECLARE_TRACE(); |
| DECLARE_TRACE_WRAPPERS(); |
| |
| // Notify fetched |m_moduleScript| to the client asynchronously. |
| void AddClient(SingleModuleClient*); |
| |
| // This is only to be used from ScriptModuleResolver implementations. |
| ModuleScript* GetModuleScript() const; |
| |
| private: |
| explicit Entry(ModuleMap*); |
| |
| void DispatchFinishedNotificationAsync(SingleModuleClient*); |
| |
| // Implements ModuleScriptLoaderClient |
| void NotifyNewSingleModuleFinished(ModuleScript*) override; |
| |
| TraceWrapperMember<ModuleScript> module_script_; |
| Member<ModuleMap> map_; |
| |
| // Correspond to the HTML spec: "fetching" state. |
| bool is_fetching_ = true; |
| |
| HeapHashSet<Member<SingleModuleClient>> clients_; |
| }; |
| |
| ModuleMap::Entry::Entry(ModuleMap* map) |
| : module_script_(this, nullptr), map_(map) { |
| DCHECK(map_); |
| } |
| |
| DEFINE_TRACE(ModuleMap::Entry) { |
| visitor->Trace(module_script_); |
| visitor->Trace(map_); |
| visitor->Trace(clients_); |
| } |
| |
| DEFINE_TRACE_WRAPPERS(ModuleMap::Entry) { |
| visitor->TraceWrappers(module_script_); |
| } |
| |
| void ModuleMap::Entry::DispatchFinishedNotificationAsync( |
| SingleModuleClient* client) { |
| map_->GetModulator()->TaskRunner()->PostTask( |
| BLINK_FROM_HERE, |
| WTF::Bind(&SingleModuleClient::NotifyModuleLoadFinished, |
| WrapPersistent(client), WrapPersistent(module_script_.Get()))); |
| } |
| |
| void ModuleMap::Entry::AddClient(SingleModuleClient* new_client) { |
| DCHECK(!clients_.Contains(new_client)); |
| if (!is_fetching_) { |
| DCHECK(clients_.IsEmpty()); |
| DispatchFinishedNotificationAsync(new_client); |
| return; |
| } |
| |
| clients_.insert(new_client); |
| } |
| |
| void ModuleMap::Entry::NotifyNewSingleModuleFinished( |
| ModuleScript* module_script) { |
| CHECK(is_fetching_); |
| module_script_ = module_script; |
| is_fetching_ = false; |
| |
| for (const auto& client : clients_) { |
| DispatchFinishedNotificationAsync(client); |
| } |
| clients_.clear(); |
| } |
| |
| ModuleScript* ModuleMap::Entry::GetModuleScript() const { |
| DCHECK(!is_fetching_); |
| return module_script_.Get(); |
| } |
| |
| ModuleMap::ModuleMap(Modulator* modulator) : modulator_(modulator) { |
| DCHECK(modulator); |
| } |
| |
| DEFINE_TRACE(ModuleMap) { |
| visitor->Trace(map_); |
| visitor->Trace(modulator_); |
| } |
| |
| DEFINE_TRACE_WRAPPERS(ModuleMap) { |
| for (const auto& it : map_) |
| visitor->TraceWrappers(it.value); |
| } |
| |
| void ModuleMap::FetchSingleModuleScript(const ModuleScriptFetchRequest& request, |
| ModuleGraphLevel level, |
| SingleModuleClient* client) { |
| // https://html.spec.whatwg.org/#fetch-a-single-module-script |
| |
| // Step 1. Let moduleMap be module map settings object's module map. |
| // Note: This is the ModuleMap. |
| |
| // Step 2. If moduleMap[url] is "fetching", wait in parallel until that |
| // entry's value changes, then queue a task on the networking task source to |
| // proceed with running the following steps. |
| MapImpl::AddResult result = |
| map_.insert(request.Url(), TraceWrapperMember<Entry>(this, nullptr)); |
| TraceWrapperMember<Entry>& entry = result.stored_value->value; |
| if (result.is_new_entry) { |
| entry = TraceWrapperMember<Entry>(this, Entry::Create(this)); |
| |
| // Steps 4-9 loads a new single module script. |
| // Delegates to ModuleScriptLoader via Modulator. |
| modulator_->FetchNewSingleModule(request, level, entry); |
| } |
| DCHECK(entry); |
| |
| // Step 3. If moduleMap[url] exists, asynchronously complete this algorithm |
| // with moduleMap[url], and abort these steps. |
| // Step 10. Set moduleMap[url] to module script, and asynchronously complete |
| // this algorithm with module script. |
| entry->AddClient(client); |
| } |
| |
| ModuleScript* ModuleMap::GetFetchedModuleScript(const KURL& url) const { |
| MapImpl::const_iterator it = map_.find(url); |
| CHECK_NE(it, map_.end()); |
| return it->value->GetModuleScript(); |
| } |
| |
| } // namespace blink |