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// Copyright 2014 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 MOJO_PUBLIC_BINDINGS_INTERFACE_H_
#define MOJO_PUBLIC_BINDINGS_INTERFACE_H_
#include <assert.h>
#include "mojo/public/bindings/message.h"
#include "mojo/public/system/core_cpp.h"
namespace mojo {
// NoInterface is for use in cases when a non-existent or empty interface is
// needed (e.g., when the Mojom "Peer" attribute is not present).
class NoInterface;
class NoInterfaceStub : public MessageReceiver {
public:
NoInterfaceStub(NoInterface* unused) {}
virtual bool Accept(Message* message) MOJO_OVERRIDE;
};
class NoInterface {
public:
typedef NoInterfaceStub _Stub;
typedef NoInterface _Peer;
};
// AnyInterface is for use in cases where any interface would do (e.g., see the
// Shell::Connect method).
typedef NoInterface AnyInterface;
// InterfaceHandle<S>
template <typename S>
class InterfaceHandle : public MessagePipeHandle {
public:
InterfaceHandle() {}
explicit InterfaceHandle(MojoHandle value) : MessagePipeHandle(value) {}
};
// Interface<S>
template <typename S>
struct Interface {
typedef InterfaceHandle<S> Handle;
typedef ScopedHandleBase<InterfaceHandle<S> > ScopedHandle;
};
template <>
struct Interface<mojo::NoInterface> {
typedef MessagePipeHandle Handle;
typedef ScopedMessagePipeHandle ScopedHandle;
};
// InterfacePipe<S,P> is used to construct a MessagePipe with typed interfaces
// on either end.
template <typename S, typename P = typename S::_Peer>
class InterfacePipe {
public:
InterfacePipe() {
typename Interface<S>::Handle h0;
typename Interface<P>::Handle h1;
MojoResult result MOJO_ALLOW_UNUSED =
MojoCreateMessagePipe(h0.mutable_value(), h1.mutable_value());
assert(result == MOJO_RESULT_OK);
handle_to_self.reset(h0);
handle_to_peer.reset(h1);
}
typename Interface<S>::ScopedHandle handle_to_self;
typename Interface<P>::ScopedHandle handle_to_peer;
};
// TODO(darin): Once we have the ability to use C++11 features, consider
// defining a template alias for ScopedInterfaceHandle<S>.
} // namespace mojo
#endif // MOJO_PUBLIC_BINDINGS_SCOPED_INTERFACE_H_
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