TxnBooleanCallable

```
public interface TxnBooleanCallable
```
A transactional callable contains the logic that needs to be executed transactionally and normally is executed by the TxnExecutor. This transactional callable is optimized for retuning a primitive type: boolean. Using this TxnBooleanCallable instead of the TxnCallable is that no object wrapper needs to be created and there is no reason to deal with a potential null value.

- Method Summary
  
  All Methods Instance Methods Abstract Methods
  Modifier and Type Method Description
  
  boolean call(Txn txn)
  Executes the callable.

- Method Detail
  - call
```
boolean call(Txn txn)
      throws java.lang.Exception
```
    Executes the callable.
    
    Parameters:
    
    txn - the Transaction. Depending on the txn PropagationLevel, this could be null.
    
    Returns:
    
    the result of the execution.
    
    Throws:
    
    java.lang.Exception