ICodeSystemCache (IBM FHIR Server)

```
public interface ICodeSystemCache
```
Abstraction of the cache service managing code systems

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`int`	`readOrAddCodeSystem(String codeSystem)`	Reads the id associated with the name of the passed Parameter from the code_systems table.

- Method Detail
  - readOrAddCodeSystem
```
int readOrAddCodeSystem(String codeSystem)
                 throws FHIRPersistenceException
```
    Reads the id associated with the name of the passed Parameter from the code_systems table. If the id for the passed name is not present in the database, an id is generated, persisted, and returned. This is done in a thread-safe way
    
    Parameters:
    
    codeSystem - A valid FHIR search parameter name.
    
    Returns:
    
    the id associated with the name of the passed Parameter.
    
    Throws:
    
    FHIRPersistenceException