3 * Copyright 2018 gRPC authors.
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
9 * http://www.apache.org/licenses/LICENSE-2.0
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
19 #ifndef GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H
20 #define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H
22 #include <grpc/support/port_platform.h>
24 #include "src/core/ext/filters/client_channel/subchannel_pool_interface.h"
28 // The local subchannel pool that is owned by a single channel. It doesn't
29 // support subchannel sharing with other channels by nature. Nor does it support
30 // subchannel retention when a subchannel is not used. The only real purpose of
31 // using this subchannel pool is to allow subchannel reuse within the channel
32 // when an incoming resolver update contains some addresses for which the
33 // channel has already created subchannels.
35 class LocalSubchannelPool final : public SubchannelPoolInterface {
37 LocalSubchannelPool();
38 ~LocalSubchannelPool() override;
40 // Implements interface methods.
41 // Thread-unsafe. Intended to be invoked within the client_channel combiner.
42 Subchannel* RegisterSubchannel(SubchannelKey* key,
43 Subchannel* constructed) override;
44 void UnregisterSubchannel(SubchannelKey* key) override;
45 Subchannel* FindSubchannel(SubchannelKey* key) override;
48 // The vtable for subchannel operations in an AVL tree.
49 static const grpc_avl_vtable subchannel_avl_vtable_;
50 // A map from subchannel key to subchannel.
51 grpc_avl subchannel_map_;
54 } // namespace grpc_core
56 #endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H */