chromium/third_party/grpc/src/src/core/ext/filters/client_channel/subchannel.h

//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//

#ifndef GRPC_SRC_CORE_EXT_FILTERS_CLIENT_CHANNEL_SUBCHANNEL_H
#define GRPC_SRC_CORE_EXT_FILTERS_CLIENT_CHANNEL_SUBCHANNEL_H

#include <grpc/support/port_platform.h>

#include <stddef.h>

#include <functional>
#include <map>
#include <memory>
#include <string>

#include "absl/base/thread_annotations.h"
#include "absl/status/status.h"
#include "absl/types/optional.h"

#include <grpc/event_engine/event_engine.h>
#include <grpc/impl/connectivity_state.h>

#include "src/core/ext/filters/client_channel/client_channel_channelz.h"
#include "src/core/ext/filters/client_channel/connector.h"
#include "src/core/ext/filters/client_channel/subchannel_pool_interface.h"
#include "src/core/lib/backoff/backoff.h"
#include "src/core/lib/channel/channel_args.h"
#include "src/core/lib/channel/channel_fwd.h"
#include "src/core/lib/channel/context.h"
#include "src/core/lib/gpr/time_precise.h"
#include "src/core/lib/gprpp/debug_location.h"
#include "src/core/lib/gprpp/dual_ref_counted.h"
#include "src/core/lib/gprpp/orphanable.h"
#include "src/core/lib/gprpp/ref_counted.h"
#include "src/core/lib/gprpp/ref_counted_ptr.h"
#include "src/core/lib/gprpp/sync.h"
#include "src/core/lib/gprpp/time.h"
#include "src/core/lib/gprpp/unique_type_name.h"
#include "src/core/lib/gprpp/work_serializer.h"
#include "src/core/lib/iomgr/call_combiner.h"
#include "src/core/lib/iomgr/closure.h"
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/iomgr/iomgr_fwd.h"
#include "src/core/lib/iomgr/polling_entity.h"
#include "src/core/lib/iomgr/resolved_address.h"
#include "src/core/lib/resource_quota/arena.h"
#include "src/core/lib/slice/slice.h"
#include "src/core/lib/transport/connectivity_state.h"
#include "src/core/lib/transport/metadata_batch.h"
#include "src/core/lib/transport/transport.h"

namespace grpc_core {

class SubchannelCall;

class ConnectedSubchannel : public RefCounted<ConnectedSubchannel> { … };

// Implements the interface of RefCounted<>.
class SubchannelCall { … };

// A subchannel that knows how to connect to exactly one target address. It
// provides a target for load balancing.
//
// Note that this is the "real" subchannel implementation, whose API is
// different from the SubchannelInterface that is exposed to LB policy
// implementations.  The client channel provides an adaptor class
// (SubchannelWrapper) that "converts" between the two.
class Subchannel : public DualRefCounted<Subchannel> { … };

}  // namespace grpc_core

#endif  // GRPC_SRC_CORE_EXT_FILTERS_CLIENT_CHANNEL_SUBCHANNEL_H