如何在多线程中重用现有的WebDriver实例

Question

My application is a multithreaded program. Each thread will execute a set of test cases. My idea is to create a new WebDriver instance for each thread and close instance when it finishes.

For example: I have 100 test cases which will be executed by 10 threads. Each thread takes ownership of 10 test cases.

As of now for each test case a browser instance is opened. Instead of that, for each thread a browser instance needs to be opened.

Answer 1

Create your WebDriver instances using a ThreadLocal . Quoting the JavaDoc on ThreadLocal :

This class provides thread-local variables. These variables differ from their normal counterparts in that each thread that accesses one (via its get or set method) has its own, independently initialized copy of the variable. ThreadLocal instances are typically private static fields in classes that wish to associate state with a thread (eg, a user ID or Transaction ID).

Example usage:

// for multiple separate test classes you need to share it among your project
public static final ThreadLocal<WebDriver> WEB_DRIVER_THREAD_LOCAL = 
    new ThreadLocal<WebDriver>() {
        @Override
        protected WebDriver initialValue() {
            // create a new instance for each thread
            return new ChromeDriver();
        }
    };

// get a WebDriver instance in your tests;
// when there is already an instance for the current Thread, it is returned;
// elsewise a new instance is created
WebDriver webDriver = WEB_DRIVER_THREAD_LOCAL.get();