适用于所有任务的单个工作线程还是多个特定的工作线程? [英] Single worker thread for all tasks or multiple specific workers?

问题描述

我正在使用PyQt5创建一个简单的GUI应用程序，其中我从API请求一些数据，然后将这些数据用于填充UI的各种控件.

I'm creating a simple GUI application using PyQt5 where I request some data from an API which is then used to populate various controls of the UI.

我所关注的有关PyQt中的工作线程的示例似乎都是QThread的子类，然后在覆盖的run()方法中进行其业务逻辑.效果很好，但我想使用工作器在不同时间执行不同的API调用.

The examples I was following about worker threads in PyQt all seem to sub-class QThread and then do their business logic in the overridden run() method. This works fine but I want to execute different API calls at different times using a worker.

所以我的问题是:我是否需要为每个希望执行的操作创建一个特定的工作线程，或者是否可以使用一个线程类来在不同的时间执行不同的操作，从而避免创建不同的线程子类的开销?

So my question is: do I need to create a specific worker thread for every operation I wish to do or is there a way of having a single thread class that I can use to carry out different operations at different times and therefore avoid the overhead of creating different thread sub-classes?

推荐答案

您可以做的是设计一个对象来执行所有这些任务(为插槽/信号继承QObject).可以说，每个任务都定义为单独的功能-可以将这些功能指定为插槽.

What you can do is design an object to do all these tasks (inherit QObject for slots / signals). Lets say each task is defined as a separate function - lets designate these functions as slots.

然后(事件的一般顺序):

Then (a general order of events):

• 实例化QThread对象.
• 实例化您的课程.
• 使用YouClass->moveToThread(pThread)将对象移动到线程中.
• 现在为每个插槽定义一个信号，并将这些信号连接到对象中的相关插槽.
• 最后使用pThread->start()
运行线程

• instantiate a QThread object.
• instantiate your class.
• Move your object into the thread using YouClass->moveToThread(pThread).
• Now define a signal for each slot and connect these signals to the relevant slots in your object.
• Finally run the thread using pThread->start()

现在，您可以发出信号来执行线程中的特定任务.不需要使用QThread的子类，只需使用从QObject派生的普通类即可(因此您可以使用插槽/信号).

Now you can emit a signal to do a particular task in the thread. You do not need to sub-class QThread just use a normal class derived from QObject (so that you can use slots/signals).

您可以在一个线程中使用一个类来执行许多操作(请注意:它们将排队).或在多个线程中创建多个类(以并行"运行).

You can either use one class in one thread to do many operations (note: they will be queued). Or make many classes in many threads (to run "parallel").

我对python不太了解，无法在此处尝试示例，所以我不会:o

I don't know python well enough to attempt an example here so I won't :o

注意:子类化QThread的原因是，如果您想扩展QThread类的功能-即添加更多/特定于线程的功能. QThread是一个控制线程的类，并不打算用于运行任意/通用任务……即使您可以随意滥用它，也可以:)

Note: The reason to sub-class QThread would be if you wanted to extend the functionality of the QThread class - i.e. add more/specific thread-related functions. QThread is a class that controls a thread, and is not meant to be used to run arbitrary/generic tasks... even though you can abuse it to do so if you wish :)

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