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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_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_MOJO_HEAP_MOJO_REMOTE_H_
#include <utility>
#include "base/task/sequenced_task_runner.h"
#include "mojo/public/cpp/bindings/remote.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"
namespace blink {
// HeapMojoRemote is a wrapper for mojo::Remote to be owned by a
// garbage-collected object. Blink is expected to use HeapMojoRemote by
// default. HeapMojoRemote must be associated with context.
// HeapMojoRemote's constructor takes context as a mandatory parameter.
// HeapMojoRemote 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 HeapMojoRemote {
DISALLOW_NEW();
public:
explicit HeapMojoRemote(ContextLifecycleNotifier* notifier)
: wrapper_(MakeGarbageCollected<Wrapper>(notifier)) {}
HeapMojoRemote(const HeapMojoRemote&) = delete;
HeapMojoRemote& operator=(const HeapMojoRemote&) = delete;
HeapMojoRemote(HeapMojoRemote&&) = default;
HeapMojoRemote& operator=(HeapMojoRemote&&) = default;
// Methods to redirect to mojo::Remote.
using Proxy = typename Interface::Proxy_;
Proxy* operator->() const { return get(); }
Proxy* get() const { return wrapper_->remote().get(); }
bool is_bound() const { return wrapper_->remote().is_bound(); }
explicit operator bool() const { return is_bound(); }
bool is_connected() const { return wrapper_->remote().is_connected(); }
void reset() { wrapper_->remote().reset(); }
void ResetWithReason(uint32_t custom_reason, const std::string& description) {
wrapper_->remote().ResetWithReason(custom_reason, description);
}
void set_disconnect_handler(base::OnceClosure handler) {
wrapper_->remote().set_disconnect_handler(std::move(handler));
}
void set_disconnect_with_reason_handler(
mojo::ConnectionErrorWithReasonCallback handler) {
wrapper_->remote().set_disconnect_with_reason_handler(std::move(handler));
}
[[nodiscard]] mojo::PendingReceiver<Interface> BindNewPipeAndPassReceiver(
scoped_refptr<base::SequencedTaskRunner> task_runner) {
DCHECK(task_runner);
return wrapper_->remote().BindNewPipeAndPassReceiver(
std::move(task_runner));
}
void Bind(mojo::PendingRemote<Interface> pending_remote,
scoped_refptr<base::SequencedTaskRunner> task_runner) {
DCHECK(task_runner);
wrapper_->remote().Bind(std::move(pending_remote), std::move(task_runner));
}
void PauseReceiverUntilFlushCompletes(mojo::PendingFlush flush) {
wrapper_->remote().PauseReceiverUntilFlushCompletes(std::move(flush));
}
mojo::PendingFlush FlushAsync() { return wrapper_->remote().FlushAsync(); }
void FlushForTesting() { return wrapper_->remote().FlushForTesting(); }
void Trace(Visitor* visitor) const { visitor->Trace(wrapper_); }
private:
// 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::Remote<Interface>& remote() { return remote_; }
// ContextLifecycleObserver methods
void ContextDestroyed() override {
if (Mode == HeapMojoWrapperMode::kWithContextObserver)
remote_.reset();
}
private:
mojo::Remote<Interface> remote_;
};
Member<Wrapper> wrapper_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_MOJO_HEAP_MOJO_REMOTE_H_
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