Wholesale move sky/engine/tonic to tonic

tonic/dart_library_loader.h

+// Copyright 2015 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.
+
+#ifndef SKY_ENGINE_TONIC_DART_LIBRARY_LOADER_H_
+#define SKY_ENGINE_TONIC_DART_LIBRARY_LOADER_H_
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "base/callback_forward.h"
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "dart/runtime/include/dart_api.h"
+
+namespace blink {
+class DartDependency;
+class DartDependencyCatcher;
+class DartLibraryProvider;
+class DartState;
+
+// TODO(abarth): This class seems more complicated than it needs to be. Is
+// there some way of simplifying this system? For example, we have a bunch
+// of inner classes that could potentially be factored out in some other way.
+class DartLibraryLoader {
+ public:
+  explicit DartLibraryLoader(DartState* dart_state);
+  ~DartLibraryLoader();
+
+  // TODO(dart): This can be called both on the main thread from application
+  // solates or from the handle watcher isolate thread.
+  static Dart_Handle HandleLibraryTag(Dart_LibraryTag tag,
+                                      Dart_Handle library,
+                                      Dart_Handle url);
+
+  void LoadLibrary(const std::string& name);
+
+  void WaitForDependencies(
+      const std::unordered_set<DartDependency*>& dependencies,
+      const base::Closure& callback);
+
+  void set_dependency_catcher(DartDependencyCatcher* dependency_catcher) {
+    DCHECK(!dependency_catcher_ || !dependency_catcher);
+    dependency_catcher_ = dependency_catcher;
+  }
+
+  DartState* dart_state() const { return dart_state_; }
+
+  DartLibraryProvider* library_provider() const { return library_provider_; }
+
+  // The |DartLibraryProvider| must outlive the |DartLibraryLoader|.
+  void set_library_provider(DartLibraryProvider* library_provider) {
+    library_provider_ = library_provider;
+  }
+
+ private:
+  class Job;
+  class ImportJob;
+  class SourceJob;
+  class DependencyWatcher;
+  class WatcherSignaler;
+
+  Dart_Handle Import(Dart_Handle library, Dart_Handle url);
+  Dart_Handle Source(Dart_Handle library, Dart_Handle url);
+  Dart_Handle CanonicalizeURL(Dart_Handle library, Dart_Handle url);
+  void DidCompleteImportJob(ImportJob* job, const std::vector<uint8_t>& buffer);
+  void DidCompleteSourceJob(SourceJob* job, const std::vector<uint8_t>& buffer);
+  void DidFailJob(Job* job);
+
+  DartState* dart_state_;
+  DartLibraryProvider* library_provider_;
+  std::unordered_map<std::string, Job*> pending_libraries_;
+  std::unordered_set<std::unique_ptr<Job>> jobs_;
+  std::unordered_set<std::unique_ptr<DependencyWatcher>> dependency_watchers_;
+  DartDependencyCatcher* dependency_catcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(DartLibraryLoader);
+};
+
+}  // namespace blink
+
+#endif  // SKY_ENGINE_TONIC_DART_LIBRARY_LOADER_H_