Built motion from commit 6a09e18b.|2.6.11

[motion2.git] / legacy-libs / grpc-cloned / deps / grpc / src / core / ext / filters / client_channel / local_subchannel_pool.h

diff --git a/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/filters/client_channel/local_subchannel_pool.h b/legacy-libs/grpc-cloned/deps/grpc/src/core/ext/filters/client_channel/local_subchannel_pool.h
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+/*
+ *
+ * Copyright 2018 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_CORE_EXT_FILTERS_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H
+#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/ext/filters/client_channel/subchannel_pool_interface.h"
+
+namespace grpc_core {
+
+// The local subchannel pool that is owned by a single channel. It doesn't
+// support subchannel sharing with other channels by nature. Nor does it support
+// subchannel retention when a subchannel is not used. The only real purpose of
+// using this subchannel pool is to allow subchannel reuse within the channel
+// when an incoming resolver update contains some addresses for which the
+// channel has already created subchannels.
+// Thread-unsafe.
+class LocalSubchannelPool final : public SubchannelPoolInterface {
+ public:
+  LocalSubchannelPool();
+  ~LocalSubchannelPool() override;
+
+  // Implements interface methods.
+  // Thread-unsafe. Intended to be invoked within the client_channel combiner.
+  Subchannel* RegisterSubchannel(SubchannelKey* key,
+                                 Subchannel* constructed) override;
+  void UnregisterSubchannel(SubchannelKey* key) override;
+  Subchannel* FindSubchannel(SubchannelKey* key) override;
+
+ private:
+  // The vtable for subchannel operations in an AVL tree.
+  static const grpc_avl_vtable subchannel_avl_vtable_;
+  // A map from subchannel key to subchannel.
+  grpc_avl subchannel_map_;
+};
+
+}  // namespace grpc_core
+
+#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LOCAL_SUBCHANNEL_POOL_H */