#include "source/common/singleton/manager_impl.h"

#include "envoy/registry/registry.h"

#include "source/common/common/assert.h"

#include "source/common/common/fmt.h"

namespace Envoy {

namespace Singleton {

InstanceSharedPtr ManagerImpl::get(const std::string& name, SingletonFactoryCb cb) {

  ASSERT(run_tid_ == thread_factory_.currentThreadId());

  ENVOY_BUG(Registry::FactoryRegistry<Registration>::getFactory(name) != nullptr,

            "invalid singleton name '" + name + "'. Make sure it is registered.");

  if (nullptr == singletons_[name].lock()) {

    InstanceSharedPtr singleton = cb();

    singletons_[name] = singleton;

    return singleton;

  } else {

    return singletons_[name].lock();

  }

}

} // namespace Singleton

} // namespace Envoy