"""Create fallback_executor
Generated by Phi-Octopus Eden
2025-11-08 12:11:54.307175
"""

```python
from typing import Callable, Any, Optional


class FallbackExecutor:
    """
    A class that provides a mechanism for executing functions with fallback behavior.
    
    This implementation allows setting up a primary function and one or more fallback functions,
    which will be attempted in sequence if the primary function fails. It also includes an
    optional custom error handler to process exceptions before attempting fallbacks.

    :param primary_function: The main function to execute, wrapped with potential fallbacks.
    :type primary_function: Callable[..., Any]
    :param fallback_functions: A list of functions that serve as fallbacks if the primary fails.
                               These functions should take the same arguments and return values
                               as the primary function.
    :type fallback_functions: Optional[List[Callable[..., Any]]]
    :param error_handler: An optional callback to handle exceptions before executing any fallback.
                          This is useful for logging, custom processing, etc.
    :type error_handler: Optional[Callable[[Exception], None]]
    """

    def __init__(self,
                 primary_function: Callable[..., Any],
                 fallback_functions: Optional[list[Callable[..., Any]]] = None,
                 error_handler: Optional[Callable[[Exception], None]] = None):
        self.primary_function = primary_function
        self.fallback_functions = [] if fallback_functions is None else fallback_functions
        self.error_handler = error_handler

    def execute(self, *args, **kwargs) -> Any:
        """
        Execute the primary function with potential fallbacks.
        
        :param args: Positional arguments to pass to the functions.
        :param kwargs: Keyword arguments to pass to the functions.
        :return: The return value of the first successful execution or the last executed function.
        """
        if self.error_handler:
            try:
                return self.primary_function(*args, **kwargs)
            except Exception as e:
                self.error_handler(e)
        else:
            try:
                return self.primary_function(*args, **kwargs)
            except Exception as e:
                for fallback in self.fallback_functions:
                    try:
                        return fallback(*args, **kwargs)
                    except Exception as e:
                        continue
        raise Exception("All functions failed to execute.")


# Example usage
def primary_function(a: int, b: int) -> int:
    """A simple function that adds two numbers."""
    return a + b


def fallback1(a: int, b: int) -> int:
    """Fallback function 1 that multiplies the numbers."""
    print("Falling back to multiplication.")
    return a * b


def fallback2(a: int, b: int) -> int:
    """Fallback function 2 that divides the first number by the second (assuming b != 0)."""
    if b == 0:
        raise ValueError("Division by zero is not allowed")
    print("Falling back to division.")
    return a / b


# Creating an instance of FallbackExecutor
executor = FallbackExecutor(primary_function, [fallback1, fallback2])

try:
    # Example execution where the primary function succeeds
    result = executor.execute(5, 3)
    print(f"Result: {result}")
except Exception as e:
    print(f"Primary and fallbacks failed with error: {e}")

# Another example where a fallback is used due to an exception in the primary function
try:
    # Example execution causing division by zero which triggers a fallback
    result = executor.execute(5, 0)
    print(f"Result: {result}")
except Exception as e:
    print(f"Primary and fallbacks failed with error: {e}")

# Custom error handler example
def custom_error_handler(e: Exception):
    print(f"Custom error handler caught an exception: {e}")


executor_with_error_handler = FallbackExecutor(primary_function, [fallback1, fallback2], custom_error_handler)
try:
    # Example execution causing division by zero which triggers a fallback and the error handler
    result = executor_with_error_handler.execute(5, 0)
    print(f"Result: {result}")
except Exception as e:
    print(f"Primary and fallbacks failed with error: {e}")

```