presto-main/src/main/java/io/prestosql/execution/resourcegroups/ResourceGroupConfigurationManagerContextInstance.java/ResourceGroupConfigurationManagerContextInstance/ResourceGroupConfigurationManagerContextInstance
class ResourceGroupConfigurationManagerContextInstance:    public ResourceGroupConfigurationManagerContextInstance(ClusterMemoryPoolManager memoryPoolManager, String environment)
    {
        this.memoryPoolManager = requireNonNull(memoryPoolManager, "memoryPoolManager is null");
        this.environment = requireNonNull(environment, "environment is null");
    }