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/*
*
* 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.
*
*/
#include <grpc/support/port_platform.h>
#include "src/core/ext/filters/client_channel/lb_policy_registry.h"
#include <string.h>
#include "src/core/lib/gpr/string.h"
#include "src/core/lib/gprpp/inlined_vector.h"
namespace grpc_core {
namespace {
class RegistryState {
public:
RegistryState() {}
void RegisterLoadBalancingPolicyFactory(
UniquePtr<LoadBalancingPolicyFactory> factory) {
for (size_t i = 0; i < factories_.size(); ++i) {
GPR_ASSERT(strcmp(factories_[i]->name(), factory->name()) != 0);
}
factories_.push_back(std::move(factory));
}
LoadBalancingPolicyFactory* GetLoadBalancingPolicyFactory(
const char* name) const {
for (size_t i = 0; i < factories_.size(); ++i) {
if (strcmp(name, factories_[i]->name()) == 0) {
return factories_[i].get();
}
}
return nullptr;
}
private:
InlinedVector<UniquePtr<LoadBalancingPolicyFactory>, 10> factories_;
};
RegistryState* g_state = nullptr;
} // namespace
//
// LoadBalancingPolicyRegistry::Builder
//
void LoadBalancingPolicyRegistry::Builder::InitRegistry() {
if (g_state == nullptr) g_state = New<RegistryState>();
}
void LoadBalancingPolicyRegistry::Builder::ShutdownRegistry() {
Delete(g_state);
g_state = nullptr;
}
void LoadBalancingPolicyRegistry::Builder::RegisterLoadBalancingPolicyFactory(
UniquePtr<LoadBalancingPolicyFactory> factory) {
InitRegistry();
g_state->RegisterLoadBalancingPolicyFactory(std::move(factory));
}
//
// LoadBalancingPolicyRegistry
//
OrphanablePtr<LoadBalancingPolicy>
LoadBalancingPolicyRegistry::CreateLoadBalancingPolicy(
const char* name, const LoadBalancingPolicy::Args& args) {
GPR_ASSERT(g_state != nullptr);
// Find factory.
LoadBalancingPolicyFactory* factory =
g_state->GetLoadBalancingPolicyFactory(name);
if (factory == nullptr) return nullptr; // Specified name not found.
// Create policy via factory.
return factory->CreateLoadBalancingPolicy(args);
}
bool LoadBalancingPolicyRegistry::LoadBalancingPolicyExists(const char* name) {
GPR_ASSERT(g_state != nullptr);
return g_state->GetLoadBalancingPolicyFactory(name) != nullptr;
}
} // namespace grpc_core
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