blob: 67d8ee94f92d40f02a646d2d263c72510c7fee91 [file] [log] [blame]
// Copyright 2017 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.
#include <stdint.h>
namespace mojo {
namespace edk {
// Selects the transport protocol to use when connecting to the remote
// process.
// New code should generally prefer to use |kAutomatic| to allow the protocol
// to be negotiated by the two processes involved in the connection. As noted
// below, this is not possible when either one of the two processes only
// supports the legacy protocol. In such cases both ends of the connection
// must be aware and explicitly use |kLegacy|, which is the default for now.
enum class TransportProtocol : int32_t {
// Legacy transport protocol. Should only be used when connecting to
// embedders which may not support at least |kVersion0|. Deprecated.
kLegacy = -2,
// Automatically negotiate the transport protocol. This will ultimately
// select the highest protocol version supported by all of the calling
// process, the broker process (if any), and the target process.
// This may only be used when connecting to embedders which support at least
// |kVersion0|. Otherwise the deprecated |kLegacy| protocol must be used.
kAutomatic = -1,
// Protocol version 0. This is NOT backwards compatible with the legacy
// protocol. If this is used to establish a connection, the remote embedder
// (and the broker, if applicable) must also support at least version 0.
kVersion0 = 0,
// The maximum version supported by the current process. This must be
// updated if a new version is added.
kMaxSupportedVersion = kVersion0,
} // namespace edk
} // namespace mojo