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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_BROWSER_EVENTS_LAZY_EVENT_DISPATCHER_H_
#define EXTENSIONS_BROWSER_EVENTS_LAZY_EVENT_DISPATCHER_H_
#include <set>
#include <utility>
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/values.h"
#include "extensions/browser/lazy_context_id.h"
#include "extensions/browser/lazy_context_task_queue.h"
#include "extensions/common/extension_id.h"
namespace content {
class BrowserContext;
}
namespace extensions {
class Extension;
struct Event;
// Helper class for EventRouter to dispatch lazy events to lazy contexts.
//
// Manages waking up lazy contexts if they are stopped.
class LazyEventDispatcher {
public:
using DispatchFunction = base::RepeatingCallback<void(
std::unique_ptr<Event>,
std::unique_ptr<LazyContextTaskQueue::ContextInfo>)>;
LazyEventDispatcher(content::BrowserContext* browser_context,
DispatchFunction dispatch_function);
LazyEventDispatcher(const LazyEventDispatcher&) = delete;
LazyEventDispatcher& operator=(const LazyEventDispatcher&) = delete;
~LazyEventDispatcher();
// Dispatches the lazy `event` to `dispatch_context`.
//
// If [dispatch_context| is for an event page, it ensures all of the pages
// interested in the event are loaded and queues the event if any pages are
// not ready yet.
//
// If [dispatch_context| is for a service worker, it ensures the worker is
// started before dispatching the event.
void Dispatch(Event& event,
const LazyContextId& dispatch_context,
const base::Value::Dict* listener_filter);
// Returns whether or not an event listener identical for `dispatch_context`
// is already queued for dispatch.
bool HasAlreadyDispatched(const LazyContextId& dispatch_context) const;
private:
// Possibly loads given extension's background page or extension Service
// Worker in preparation to dispatch an event. Returns true if the event was
// queued for subsequent dispatch, false otherwise.
bool QueueEventDispatch(Event& event,
const LazyContextId& dispatch_context,
const Extension* extension,
const base::Value::Dict* listener_filter);
void RecordAlreadyDispatched(const LazyContextId& dispatch_context);
const raw_ptr<content::BrowserContext> browser_context_;
DispatchFunction dispatch_function_;
std::set<LazyContextId> dispatched_ids_;
};
} // namespace extensions
#endif // EXTENSIONS_BROWSER_EVENTS_LAZY_EVENT_DISPATCHER_H_
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