scistag.webstag.server.flask_server.flask_hosting_thread.FlaskHostingThread¶

class FlaskHostingThread(server)[source]¶

Bases: ManagedThread

Executes a Flask server in a separate thread so that it can run in parallel to another main application.

Parameters: server (WebStagServer) – The server to run in this thread

Methods

`force_kill`	Throws an interrupt exception on the thread to request its termination.
`force_kill_thread`	Tries to kill a thread by raising an exception.
`getName`
`get_active_threads`	Returns a list of all running, managed threads
`isDaemon`
`is_alive`	Return whether the thread is alive.
`join`	Wait until the thread terminates.
`raise_exception_async`	Raises an exception in another thread, e.g.
`run`	Thread main execution function
`run_loop`	Override this method with your own task handling method.
`setDaemon`
`setName`
`start`	Starts the thread
`terminate`	Signals the termination flag.
`unregister_thread`	Removes this thread from the global registry

Attributes

`__annotations__`
`__dict__`
`__doc__`
`__module__`
`__weakref__`	list of weak references to the object (if defined)
`_initialized`
`_managed_threads`	List of all running threads
`_mt_access_lock`	Access lock to shared, global class variables
`daemon`	A boolean value indicating whether this thread is a daemon thread.
`ident`	Thread identifier of this thread or None if it has not been started.
`name`	A string used for identification purposes only.
`native_id`	Native integral thread ID of this thread, or None if it has not been started.

_delete()¶: Remove current thread from the dict of currently running threads.

_set_tstate_lock()¶: Set a lock object which will be released by the interpreter when the underlying thread state (see pystate.h) gets deleted.

force_kill()¶

Throws an interrupt exception on the thread to request its termination.

Warning: This should really be the absolute last solution to get rid of a thread, e.g. an infinite running Flask server. For all other threads use terminate() and join().

Return type: bool
Returns: True on success.

classmethod force_kill_thread(thread)¶

Tries to kill a thread by raising an exception.

Parameters: thread (Thread) – The thread which we try to kill.
Return type: bool
Returns: True on success

classmethod get_active_threads()¶

Returns a list of all running, managed threads

Return type: list[ManagedThread]
Returns: The list of active threads

is_alive()¶

Return whether the thread is alive.

This method returns True just before the run() method starts until just after the run() method terminates. See also the module function enumerate().

join(timeout=None)¶

Wait until the thread terminates.

This blocks the calling thread until the thread whose join() method is called terminates – either normally or through an unhandled exception or until the optional timeout occurs.

When the timeout argument is present and not None, it should be a floating point number specifying a timeout for the operation in seconds (or fractions thereof). As join() always returns None, you must call is_alive() after join() to decide whether a timeout happened – if the thread is still alive, the join() call timed out.

When the timeout argument is not present or None, the operation will block until the thread terminates.

A thread can be join()ed many times.

join() raises a RuntimeError if an attempt is made to join the current thread as that would cause a deadlock. It is also an error to join() a thread before it has been started and attempts to do so raises the same exception.

static raise_exception_async(ident, exception_class)¶

Raises an exception in another thread, e.g. to kill it such as interrupting a Flask server’s endless loop.

Parameters

ident – The thread’s ident (e.g. thread.ident)
exception_class – The type of the exception to raise, e.g. KeyboardException.

run()[source]¶

Thread main execution function

Return type: None

run_loop()¶: Override this method with your own task handling method.

start()¶

Starts the thread

Return type: None

terminate()¶

Signals the termination flag.

Signals the termination event. If you have other events, e.g for your task list, override this method and trigger them from here as well.

unregister_thread()¶: Removes this thread from the global registry

_access_lock¶: The lock to access the thread’s data

_managed_threads: list[scistag.common.mt.managed_thread.ManagedThread] = []¶: List of all running threads

_mt_access_lock = <scistag.common.mt.stag_lock.StagLock object>¶: Access lock to shared, global class variables

property daemon¶

A boolean value indicating whether this thread is a daemon thread.

This must be set before start() is called, otherwise RuntimeError is raised. Its initial value is inherited from the creating thread; the main thread is not a daemon thread and therefore all threads created in the main thread default to daemon = False.

The entire Python program exits when only daemon threads are left.

property ident¶

Thread identifier of this thread or None if it has not been started.

This is a nonzero integer. See the get_ident() function. Thread identifiers may be recycled when a thread exits and another thread is created. The identifier is available even after the thread has exited.

property name¶

A string used for identification purposes only.

It has no semantics. Multiple threads may be given the same name. The initial name is set by the constructor.

property native_id¶

Native integral thread ID of this thread, or None if it has not been started.

This is a non-negative integer. See the get_native_id() function. This represents the Thread ID as reported by the kernel.

terminate_event¶: Event to be flagged when the thread shall terminate

thread_name¶: The thread’s name (as visible in the debugger)