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// Copyright 2018 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 COMPONENTS_ARC_SESSION_MOJO_CHANNEL_H_
#define COMPONENTS_ARC_SESSION_MOJO_CHANNEL_H_
#include <utility>
#include "base/bind.h"
#include "base/macros.h"
#include "components/arc/session/connection_holder.h"
#include "mojo/public/cpp/bindings/pending_remote.h"
#include "mojo/public/cpp/bindings/remote.h"
namespace arc {
// Thin interface to wrap Remote<T> with type erasure.
class MojoChannelBase {
public:
virtual ~MojoChannelBase() = default;
protected:
MojoChannelBase() = default;
private:
DISALLOW_COPY_AND_ASSIGN(MojoChannelBase);
};
// Thin wrapper for Remote<T>, where T is one of ARC mojo Instance class.
template <typename InstanceType, typename HostType>
class MojoChannel : public MojoChannelBase {
public:
MojoChannel(ConnectionHolder<InstanceType, HostType>* holder,
mojo::PendingRemote<InstanceType> remote)
: holder_(holder), remote_(std::move(remote)) {
// Delay registration to the ConnectionHolder until the version is ready.
}
~MojoChannel() override { holder_->CloseInstance(remote_.get()); }
void set_disconnect_handler(base::OnceClosure error_handler) {
remote_.set_disconnect_handler(std::move(error_handler));
}
void QueryVersion() {
// Note: the callback will not be called if |remote_| is destroyed.
remote_.QueryVersion(
base::BindOnce(&MojoChannel::OnVersionReady, base::Unretained(this)));
}
private:
void OnVersionReady(uint32_t unused_version) {
holder_->SetInstance(remote_.get(), remote_.version());
}
// Externally owned ConnectionHolder instance.
ConnectionHolder<InstanceType, HostType>* const holder_;
// Put as a last member to ensure that any callback tied to the |remote_|
// is not invoked.
mojo::Remote<InstanceType> remote_;
DISALLOW_COPY_AND_ASSIGN(MojoChannel);
};
} // namespace arc
#endif // COMPONENTS_ARC_SESSION_MOJO_CHANNEL_H_
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