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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 EXTENSIONS_RENDERER_SCRIPT_CONTEXT_SET_H_
#define EXTENSIONS_RENDERER_SCRIPT_CONTEXT_SET_H_
#include <set>
#include <string>
#include "base/basictypes.h"
#include "base/bind.h"
#include "v8/include/v8.h"
class GURL;
namespace base {
class ListValue;
}
namespace content {
class RenderView;
}
namespace v8 {
class Context;
}
namespace extensions {
class ScriptContext;
// A container of ExtensionBindingsContext. Since calling JavaScript within a
// context can cause any number of contexts to be created or destroyed, this
// has additional smarts to help with the set changing underneath callers.
class ScriptContextSet {
public:
ScriptContextSet();
~ScriptContextSet();
int size() const;
// Takes ownership of |context|.
void Add(ScriptContext* context);
// If the specified context is contained in this set, remove it, then delete
// it asynchronously. After this call returns the context object will still
// be valid, but its frame() pointer will be cleared.
void Remove(ScriptContext* context);
// Returns a copy to protect against changes.
typedef std::set<ScriptContext*> ContextSet;
ContextSet GetAll() const;
// Gets the ScriptContext corresponding to v8::Context::GetCurrent(), or
// NULL if no such context exists.
ScriptContext* GetCurrent() const;
// Gets the ScriptContext corresponding to v8::Context::GetCalling(), or
// NULL if no such context exists.
ScriptContext* GetCalling() const;
// Gets the ScriptContext corresponding to the specified
// v8::Context or NULL if no such context exists.
ScriptContext* GetByV8Context(v8::Handle<v8::Context> context) const;
// Synchronously runs |callback| with each ScriptContext that belongs to
// |extension_id| in |render_view|.
//
// An empty |extension_id| will match all extensions, and a NULL |render_view|
// will match all render views, but try to use the inline variants of these
// methods instead.
void ForEach(const std::string& extension_id,
content::RenderView* render_view,
const base::Callback<void(ScriptContext*)>& callback) const;
// ForEach which matches all extensions.
void ForEach(content::RenderView* render_view,
const base::Callback<void(ScriptContext*)>& callback) const {
ForEach("", render_view, callback);
}
// ForEach which matches all render views.
void ForEach(const std::string& extension_id,
const base::Callback<void(ScriptContext*)>& callback) const {
ForEach(extension_id, NULL, callback);
}
// Cleans up contexts belonging to an unloaded extension.
//
// Returns the set of ScriptContexts that were removed as a result. These
// are safe to interact with until the end of the current event loop, since
// they're deleted asynchronously.
ContextSet OnExtensionUnloaded(const std::string& extension_id);
private:
ContextSet contexts_;
DISALLOW_COPY_AND_ASSIGN(ScriptContextSet);
};
} // namespace extensions
#endif // EXTENSIONS_RENDERER_SCRIPT_CONTEXT_SET_H_
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