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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_ASSOCIATED_RECEIVER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MOJO_HEAP_MOJO_ASSOCIATED_RECEIVER_H_
#include <utility>
#include "base/gtest_prod_util.h"
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/cpp/bindings/associated_receiver.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/heap/prefinalizer.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 {
// HeapMojoAssociatedReceiver is a wrapper for mojo::AssociatedReceiver to be
// owned by a garbage-collected object. Blink is expected to use
// HeapMojoAssociatedReceiver by default. HeapMojoAssociatedReceiver must be
// associated with context. HeapMojoAssociatedReceiver's constructor takes
// context as a mandatory parameter. HeapMojoAssociatedReceiver resets the mojo
// connection when 1) the owner object is garbage-collected and 2) 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,
typename Owner,
HeapMojoWrapperMode Mode = HeapMojoWrapperMode::kWithContextObserver>
class HeapMojoAssociatedReceiver {
DISALLOW_NEW();
public:
HeapMojoAssociatedReceiver(Owner* owner, ContextLifecycleNotifier* context)
: wrapper_(MakeGarbageCollected<Wrapper>(owner, context)) {
static_assert(std::is_base_of<Interface, Owner>::value,
"Owner should implement Interface");
static_assert(IsGarbageCollectedType<Owner>::value,
"Owner needs to be a garbage collected object");
}
HeapMojoAssociatedReceiver(const HeapMojoAssociatedReceiver&) = delete;
HeapMojoAssociatedReceiver& operator=(const HeapMojoAssociatedReceiver&) =
delete;
// Methods to redirect to mojo::AssociatedReceiver:
bool is_bound() const { return wrapper_->associated_receiver().is_bound(); }
void reset() { wrapper_->associated_receiver().reset(); }
void set_disconnect_handler(base::OnceClosure handler) {
wrapper_->associated_receiver().set_disconnect_handler(std::move(handler));
}
[[nodiscard]] mojo::PendingAssociatedRemote<Interface>
BindNewEndpointAndPassRemote(
scoped_refptr<base::SequencedTaskRunner> task_runner) {
DCHECK(task_runner);
return wrapper_->associated_receiver().BindNewEndpointAndPassRemote(
std::move(task_runner));
}
void Bind(
mojo::PendingAssociatedReceiver<Interface> pending_associated_receiver,
scoped_refptr<base::SequencedTaskRunner> task_runner) {
DCHECK(task_runner);
wrapper_->associated_receiver().Bind(std::move(pending_associated_receiver),
std::move(task_runner));
}
bool WaitForIncomingCall() {
return wrapper_->associated_receiver().WaitForIncomingCall();
}
void SetFilter(std::unique_ptr<mojo::MessageFilter> filter) {
wrapper_->associated_receiver().SetFilter(std::move(filter));
}
void Trace(Visitor* visitor) const { visitor->Trace(wrapper_); }
private:
FRIEND_TEST_ALL_PREFIXES(HeapMojoAssociatedReceiverGCWithContextObserverTest,
NoResetOnConservativeGC);
// Garbage collected wrapper class to add a prefinalizer.
class Wrapper final : public GarbageCollected<Wrapper>,
public ContextLifecycleObserver {
USING_PRE_FINALIZER(Wrapper, Dispose);
public:
Wrapper(Owner* owner, ContextLifecycleNotifier* notifier)
: owner_(owner), associated_receiver_(owner) {
SetContextLifecycleNotifier(notifier);
}
void Trace(Visitor* visitor) const override {
visitor->Trace(owner_);
ContextLifecycleObserver::Trace(visitor);
}
void Dispose() { associated_receiver_.reset(); }
mojo::AssociatedReceiver<Interface>& associated_receiver() {
return associated_receiver_;
}
// ContextLifecycleObserver methods
void ContextDestroyed() override {
if (Mode == HeapMojoWrapperMode::kWithContextObserver)
associated_receiver_.reset();
}
private:
Member<Owner> owner_;
mojo::AssociatedReceiver<Interface> associated_receiver_;
};
Member<Wrapper> wrapper_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MOJO_HEAP_MOJO_ASSOCIATED_RECEIVER_H_
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