API Reference > imodeljs-backend > iModels > ConcurrencyControl > ConcurrencyControl.CodesManager ConcurrencyControl.CodesManager Class Beta Code manager. This class can be used to reserve Codes ahead of time and to query the status of Codes. See ConcurrencyControl.requestResources for how to reserve Codes as they are used. Methods Name Description areAvailable(requestContext: AuthorizedClientRequestContext, codes: CodeProps[]): Promise<boolean> Check to see if all of the specified codes are available to be reserved. Beta isReserved(code: CodeProps): boolean Returns true if the specified code has been reserved by this briefcase. Beta query(requestContext: AuthorizedClientRequestContext, specId: string, scopeId: string, value?: string): Promise<HubCode[]> Queries the state of the specified Codes in the code service. reserve(requestContext: AuthorizedClientRequestContext, codes?: CodeProps[]): Promise<void> Reserve Codes. Defined in core/backend/src/ConcurrencyControl.ts Line 1200 Last Updated: 29 November, 2022