Worker design pattern | 易学教程

问题

What is "worker" design pattern?

回答1:

It could be that you are after a worker thread pattern, where you use a queue to schedule tasks that you want to be processed "offline" by a worker thread. Some solutions will use a pool of worker threads instead of single thread to achieve performance gains by utilising paralelisation.

回答2:

The worker design pattern

Problem:

You have a small object which is data and large set of operations which could be performed to that object
You want to keep the object’s method list small
The operations can be done in different ways, including different implementations
Your small object only knows how to read and save itself from the data abstraction layer
You want to batch process a number of small objects

Solution:

You have a worker interface which defines the accessor API for the worker and how to add subjects
You can have multiple workers per subject
Your worker does the transformation, your subject is transformed
Your subject is kept light weight

Example:

Your ImageBinary object represents the image binary including height and width (metadata is decoupled). You perform various operations on this object like resizing, cropping, scaling.

$image1 = new ImageBinary(array(‘id’ => 1));
$image2 = new ImageBinary(array(‘id’ => 2));
$image3 = new ImageBinary(array(‘id’ => 3));

$worker = new ImageWorker;
$worker->add($image1);
$worker->add($image2);
$worker->add($image3);
$worker->rotate(90);

Related patterns

Manager
Adapter

回答3:

Something like MapReduce comes to mind. Where multiple tasks can be performed in parallel on worker nodes.

Edit: As @larsmans mentioned, this is known as the Master/Worker pattern.

来源：https://stackoverflow.com/questions/4945509/worker-design-pattern

标签

oop

design-patterns

worker