class documentation

This class (hopefully) generalizes the functionality of a pool of threads to which work can be dispatched.

callInThread and stop should only be called from a single thread.

Method __getstate__ Undocumented
Method __init__ Create a new threadpool.
Method __setstate__ Undocumented
Method adjustPoolsize Adjust the number of available threads by setting min and max to new values.
Method callInThread Call a callable object in a separate thread.
Method callInThreadWithCallback Call a callable object in a separate thread and call onResult with the return value, or a twisted.python.failure.Failure if the callable raises an exception.
Method dumpStats Dump some plain-text informational messages to the log about the state of this ThreadPool.
Method start Start the threadpool.
Method startAWorker Increase the number of available workers for the thread pool by 1, up to the maximum allowed by ThreadPool.max.
Method stop Shutdown the threads in the threadpool.
Method stopAWorker Decrease the number of available workers by 1, by quitting one as soon as it's idle.
Class Variable currentThread Undocumented
Instance Variable joined Undocumented
Instance Variable max Undocumented
Instance Variable min Undocumented
Instance Variable name Undocumented
Instance Variable started Whether or not the thread pool is currently running.
Instance Variable threads List of workers currently running in this thread pool.
Property waiters For legacy compatibility purposes, return the number of idle workers as expressed by a list the length of that number.
Property workers For legacy compatibility purposes, return a total number of workers.
Property working For legacy compatibility purposes, return the number of busy workers as expressed by a list the length of that number.
Method _generateName Generate a name for a new pool thread.
Instance Variable _pool A hook for testing.
Instance Variable _team Undocumented
Property _queue For legacy compatibility purposes, return an object with a qsize method that indicates the amount of work not yet allocated to a worker.
def __getstate__(self) -> _State: (source)

Undocumented

def __init__(self, minthreads: int = 5, maxthreads: int = 20, name: Optional[str] = None): (source)

Create a new threadpool.

Parameters
minthreads:intminimum number of threads in the pool
maxthreads:intmaximum number of threads in the pool
name:native strThe name to give this threadpool; visible in log messages.
def __setstate__(self, state: _State): (source)

Undocumented

def adjustPoolsize(self, minthreads: Optional[int] = None, maxthreads: Optional[int] = None): (source)

Adjust the number of available threads by setting min and max to new values.

Parameters
minthreads:Optional[int]The new value for ThreadPool.min.
maxthreads:Optional[int]The new value for ThreadPool.max.
def callInThread(self, func: Callable[_P, object], *args: _P.args, **kw: _P.kwargs): (source)

Call a callable object in a separate thread.

Parameters
func:Callable[_P, object]callable object to be called in separate thread
*args:_P.argspositional arguments to be passed to func
**kw:_P.kwargskeyword args to be passed to func
def callInThreadWithCallback(self, onResult: Optional[Callable[[bool, _R], object]], func: Callable[_P, _R], *args: _P.args, **kw: _P.kwargs): (source)

Call a callable object in a separate thread and call onResult with the return value, or a twisted.python.failure.Failure if the callable raises an exception.

The callable is allowed to block, but the onResult function must not block and should perform as little work as possible.

A typical action for onResult for a threadpool used with a Twisted reactor would be to schedule a twisted.internet.defer.Deferred to fire in the main reactor thread using .callFromThread. Note that onResult is called inside the separate thread, not inside the reactor thread.

Parameters
onResult:Optional[Callable[[bool, _R], object]]

a callable with the signature (success, result). If the callable returns normally, onResult is called with (True, result) where result is the return value of the callable. If the callable throws an exception, onResult is called with (False, failure).

Optionally, onResult may be None, in which case it is not called at all.

func:Callable[_P, _R]callable object to be called in separate thread
*args:_P.argspositional arguments to be passed to func
**kw:_P.kwargskeyword arguments to be passed to func
def dumpStats(self): (source)

Dump some plain-text informational messages to the log about the state of this ThreadPool.

def start(self): (source)

Start the threadpool.

def startAWorker(self): (source)

Increase the number of available workers for the thread pool by 1, up to the maximum allowed by ThreadPool.max.

def stop(self): (source)

Shutdown the threads in the threadpool.

def stopAWorker(self): (source)

Decrease the number of available workers by 1, by quitting one as soon as it's idle.

currentThread = (source)

Undocumented

Undocumented

Undocumented

Undocumented

Undocumented

Whether or not the thread pool is currently running.

List of workers currently running in this thread pool.

For legacy compatibility purposes, return the number of idle workers as expressed by a list the length of that number.

For legacy compatibility purposes, return a total number of workers.

For legacy compatibility purposes, return the number of busy workers as expressed by a list the length of that number.

def _generateName(self) -> str: (source)

Generate a name for a new pool thread.

Returns
native strA distinctive name for the thread.
_pool: callable compatible with _pool = (source)

A hook for testing.

Undocumented

For legacy compatibility purposes, return an object with a qsize method that indicates the amount of work not yet allocated to a worker.