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class TimeoutException

Maturity: 34

A custom exception class that is raised when an operation exceeds its allocated time limit.

File:
/tf/active/vicechatdev/docchat/document_indexer.py
Lines:
82 - 84
Complexity:
simple

Purpose

TimeoutException is a specialized exception class that inherits from Python's built-in Exception class. It is designed to signal timeout conditions in operations that have time constraints, providing a clear and specific exception type for timeout-related errors. This allows calling code to distinguish timeout failures from other types of exceptions and handle them appropriately.

Source Code

class TimeoutException(Exception):
    """Exception raised when operation times out"""
    pass

Parameters

Name Type Default Kind
bases Exception -

Parameter Details

*args: Variable positional arguments passed to the base Exception class, typically a message string describing the timeout condition

**kwargs: Variable keyword arguments passed to the base Exception class for additional exception metadata

Return Value

Instantiation returns a TimeoutException instance that can be raised and caught like any standard Python exception. The exception object contains the message and any additional data passed during instantiation.

Class Interface

Methods

__init__(*args, **kwargs)

Purpose: Initializes a new TimeoutException instance by calling the parent Exception class constructor

Parameters:

  • *args: Variable positional arguments, typically a message string describing the timeout
  • **kwargs: Variable keyword arguments for additional exception metadata

Returns: None (constructor)

Attributes

Name Type Description Scope
args tuple Tuple containing the arguments passed to the exception (inherited from Exception base class) instance

Usage Example

# Raising the exception
try:
    # Simulate a timeout condition
    raise TimeoutException("Operation exceeded 30 second timeout")
except TimeoutException as e:
    print(f"Caught timeout: {e}")

# Using with a custom timeout handler
import time
import signal

def timeout_handler(signum, frame):
    raise TimeoutException("Function execution timed out")

# Set up signal-based timeout
signal.signal(signal.SIGALRM, timeout_handler)
signal.alarm(5)  # 5 second timeout

try:
    # Long-running operation
    time.sleep(10)
except TimeoutException:
    print("Operation was terminated due to timeout")
finally:
    signal.alarm(0)  # Cancel the alarm

Best Practices

  • Use TimeoutException to clearly distinguish timeout errors from other exception types in your error handling logic
  • Always provide a descriptive message when raising TimeoutException to help with debugging (e.g., include the timeout duration and operation name)
  • Catch TimeoutException specifically before catching more general exceptions to handle timeout scenarios differently
  • Consider using TimeoutException in conjunction with threading.Timer, signal.alarm, or asyncio.wait_for for implementing actual timeout mechanisms
  • Document the timeout behavior and conditions in functions that may raise TimeoutException
  • TimeoutException instances are immutable once created, like all standard Python exceptions

Tags

exception error-handling timeout custom-exception time-management control-flow

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