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// Copyright 2014 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 CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
#define CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
#include <set>
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "gin/modules/module_registry_observer.h"
#include "mojo/public/cpp/system/core.h"
#include "v8/include/v8.h"
namespace blink {
class WebFrame;
class WebURLResponse;
}
namespace gin {
class ContextHolder;
struct PendingModule;
}
namespace content {
class ResourceFetcher;
class WebUIRunner;
// WebUIMojoContextState manages the modules needed for mojo bindings. It does
// this by way of gin. Non-builtin modules are downloaded by way of
// ResourceFetchers.
class WebUIMojoContextState : public gin::ModuleRegistryObserver {
public:
WebUIMojoContextState(blink::WebFrame* frame,
v8::Handle<v8::Context> context);
virtual ~WebUIMojoContextState();
// Called once the mojo::Handle is available.
void SetHandle(mojo::ScopedMessagePipeHandle handle);
// Returns true if at least one module was added.
bool module_added() const { return module_added_; }
private:
class Loader;
// Invokes FetchModule() for any modules that have not already been
// downloaded.
void FetchModules(const std::vector<std::string>& ids);
// Creates a ResourceFetcher to download |module|.
void FetchModule(const std::string& module);
// Callback once a module has finished downloading. Passes data to |runner_|.
void OnFetchModuleComplete(ResourceFetcher* fetcher,
const blink::WebURLResponse& response,
const std::string& data);
// gin::ModuleRegistryObserver overrides:
virtual void OnDidAddPendingModule(
const std::string& id,
const std::vector<std::string>& dependencies) OVERRIDE;
// Frame script is executed in. Also used to download resources.
blink::WebFrame* frame_;
// See description above getter.
bool module_added_;
// Executes the script from gin.
scoped_ptr<WebUIRunner> runner_;
// Set of fetchers we're waiting on to download script.
ScopedVector<ResourceFetcher> module_fetchers_;
// Set of modules we've fetched script from.
std::set<std::string> fetched_modules_;
DISALLOW_COPY_AND_ASSIGN(WebUIMojoContextState);
};
} // namespace content
#endif // CONTENT_RENDERER_WEB_UI_MOJO_CONTEXT_STATE_H_
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