"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-07 07:59:00.874045
"""

```python
class FallbackExecutor:
    """
    A class for executing tasks with a fallback mechanism in case of errors.

    This class is designed to handle situations where a primary function may fail,
    and a secondary (fallback) function should be used as a recovery measure.
    The `execute` method attempts to execute the primary function, and if it raises
    an exception, the fallback function is executed instead. Both functions must return
    meaningful results.

    :param primary: A callable representing the primary task to attempt execution.
    :param fallback: A callable representing the secondary task to attempt execution
                     in case the primary fails.
    """

    def __init__(self, primary: callable, fallback: callable):
        self.primary = primary
        self.fallback = fallback

    def execute(self) -> object:
        """
        Execute the primary function or its fallback if an error occurs.

        :return: The result of the executed function. If an exception is caught during the execution of `primary`,
                 it returns the result of executing `fallback`.
        """
        try:
            return self.primary()
        except Exception as e:
            print(f"An error occurred while executing primary task: {e}")
            return self.fallback()


# Example usage
def multiply_by_two(num: int) -> int:
    """Multiply a number by two."""
    if num == 5:
        raise ValueError("Invalid input")
    return num * 2


def add_one(num: int) -> int:
    """Add one to the given number as a fallback."""
    return num + 1


# Create instances of the functions
primary_task = multiply_by_two
fallback_task = add_one

# Create an instance of FallbackExecutor with these functions
executor = FallbackExecutor(primary=primary_task, fallback=fallback_task)

# Execute and print the result
print(executor.execute())  # Input: 5; Output: Should return 6 due to fallback

```