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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_MOJO_HEAP_MOJO_REMOTE_SET_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MOJO_HEAP_MOJO_REMOTE_SET_H_
#include <utility>
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_refptr.h"
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/cpp/bindings/remote.h"
#include "mojo/public/cpp/bindings/remote_set.h"
#include "third_party/blink/renderer/platform/context_lifecycle_observer.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/mojo/heap_mojo_wrapper_mode.h"
#include "third_party/blink/renderer/platform/mojo/mojo_binding_context.h"
namespace blink {
// HeapMojoRemoteSet is a wrapper for mojo::RemoteSet to be owned by a
// garbage-collected object. Blink is expected to use HeapMojoRemoteSet by
// default. HeapMojoRemoteSet must be associated with context.
// HeapMojoRemoteSet's constructor takes context as a mandatory parameter.
// HeapMojoRemoteSet resets the mojo connection when the associated
// ExecutionContext is detached.
// TODO(crbug.com/1058076) HeapMojoWrapperMode should be removed once we ensure
// that the interface is not used after ContextDestroyed().
template <typename Interface,
HeapMojoWrapperMode Mode = HeapMojoWrapperMode::kWithContextObserver>
class HeapMojoRemoteSet {
DISALLOW_NEW();
public:
using DisconnectHandler =
typename mojo::RemoteSet<Interface>::DisconnectHandler;
using Iterator = typename mojo::RemoteSet<Interface>::Iterator;
explicit HeapMojoRemoteSet(ContextLifecycleNotifier* notifier)
: wrapper_(MakeGarbageCollected<Wrapper>(notifier)) {}
HeapMojoRemoteSet(const HeapMojoRemoteSet&) = delete;
HeapMojoRemoteSet& operator=(const HeapMojoRemoteSet&) = delete;
HeapMojoRemoteSet(HeapMojoRemoteSet&&) = default;
HeapMojoRemoteSet& operator=(HeapMojoRemoteSet&&) = default;
// Methods to redirect to mojo::RemoteSet:
void set_disconnect_handler(DisconnectHandler handler) {
wrapper_->remote_set().set_disconnect_handler(std::move(handler));
}
mojo::RemoteSetElementId Add(mojo::Remote<Interface> remote) {
return wrapper_->remote_set().Add(std::move(remote));
}
mojo::RemoteSetElementId Add(
mojo::PendingRemote<Interface> remote,
scoped_refptr<base::SequencedTaskRunner> task_runner) {
DCHECK(task_runner);
return wrapper_->remote_set().Add(std::move(remote), task_runner);
}
void Remove(mojo::RemoteSetElementId id) {
wrapper_->remote_set().Remove(id);
}
bool Contains(mojo::RemoteSetElementId id) {
return wrapper_->remote_set().Contains(id);
}
void Clear() { wrapper_->remote_set().Clear(); }
bool empty() const { return wrapper_->remote_set().empty(); }
size_t size() const { return wrapper_->remote_set().size(); }
Iterator begin() { return wrapper_->remote_set().begin(); }
Iterator begin() const { return wrapper_->remote_set().begin(); }
Iterator end() { return wrapper_->remote_set().end(); }
Iterator end() const { return wrapper_->remote_set().end(); }
void Trace(Visitor* visitor) const { visitor->Trace(wrapper_); }
private:
FRIEND_TEST_ALL_PREFIXES(HeapMojoRemoteSetGCWithContextObserverTest,
NoClearOnConservativeGC);
// Garbage collected wrapper class to add ContextLifecycleObserver.
class Wrapper final : public GarbageCollected<Wrapper>,
public ContextLifecycleObserver {
public:
explicit Wrapper(ContextLifecycleNotifier* notifier) {
SetContextLifecycleNotifier(notifier);
}
Wrapper(const Wrapper&) = delete;
Wrapper& operator=(const Wrapper&) = delete;
Wrapper(Wrapper&&) = default;
Wrapper& operator=(Wrapper&&) = default;
void Trace(Visitor* visitor) const override {
ContextLifecycleObserver::Trace(visitor);
}
mojo::RemoteSet<Interface>& remote_set() { return remote_set_; }
// ContextLifecycleObserver methods
void ContextDestroyed() override {
if (Mode == HeapMojoWrapperMode::kWithContextObserver)
remote_set_.Clear();
}
private:
mojo::RemoteSet<Interface> remote_set_;
};
Member<Wrapper> wrapper_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MOJO_HEAP_MOJO_REMOTE_SET_H_
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