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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.
//
//
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/subchannel_pool_interface.h"
#include "src/core/lib/gpr/useful.h"
// The subchannel pool to reuse subchannels.
#define GRPC_ARG_SUBCHANNEL_POOL "grpc.subchannel_pool"
// The subchannel key ID that is only used in test to make each key unique.
#define GRPC_ARG_SUBCHANNEL_KEY_TEST_ONLY_ID "grpc.subchannel_key_test_only_id"
namespace grpc_core {
TraceFlag grpc_subchannel_pool_trace(false, "subchannel_pool");
SubchannelKey::SubchannelKey(const grpc_channel_args* args) {
Init(args, grpc_channel_args_normalize);
}
SubchannelKey::~SubchannelKey() {
grpc_channel_args_destroy(const_cast<grpc_channel_args*>(args_));
}
SubchannelKey::SubchannelKey(const SubchannelKey& other) {
Init(other.args_, grpc_channel_args_copy);
}
SubchannelKey& SubchannelKey::operator=(const SubchannelKey& other) {
if (&other == this) {
return *this;
}
grpc_channel_args_destroy(const_cast<grpc_channel_args*>(args_));
Init(other.args_, grpc_channel_args_copy);
return *this;
}
SubchannelKey::SubchannelKey(SubchannelKey&& other) noexcept {
args_ = other.args_;
other.args_ = nullptr;
}
SubchannelKey& SubchannelKey::operator=(SubchannelKey&& other) noexcept {
args_ = other.args_;
other.args_ = nullptr;
return *this;
}
bool SubchannelKey::operator<(const SubchannelKey& other) const {
return grpc_channel_args_compare(args_, other.args_) < 0;
}
void SubchannelKey::Init(
const grpc_channel_args* args,
grpc_channel_args* (*copy_channel_args)(const grpc_channel_args* args)) {
args_ = copy_channel_args(args);
}
namespace {
void* arg_copy(void* p) {
auto* subchannel_pool = static_cast<SubchannelPoolInterface*>(p);
subchannel_pool->Ref().release();
return p;
}
void arg_destroy(void* p) {
auto* subchannel_pool = static_cast<SubchannelPoolInterface*>(p);
subchannel_pool->Unref();
}
int arg_cmp(void* a, void* b) { return GPR_ICMP(a, b); }
const grpc_arg_pointer_vtable subchannel_pool_arg_vtable = {
arg_copy, arg_destroy, arg_cmp};
} // namespace
grpc_arg SubchannelPoolInterface::CreateChannelArg(
SubchannelPoolInterface* subchannel_pool) {
return grpc_channel_arg_pointer_create(
const_cast<char*>(GRPC_ARG_SUBCHANNEL_POOL), subchannel_pool,
&subchannel_pool_arg_vtable);
}
SubchannelPoolInterface*
SubchannelPoolInterface::GetSubchannelPoolFromChannelArgs(
const grpc_channel_args* args) {
const grpc_arg* arg = grpc_channel_args_find(args, GRPC_ARG_SUBCHANNEL_POOL);
if (arg == nullptr || arg->type != GRPC_ARG_POINTER) return nullptr;
return static_cast<SubchannelPoolInterface*>(arg->value.pointer.p);
}
} // namespace grpc_core
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