Method and principle of JAVA encapsulation multi-threaded implementation

Preface

In Java, the principle of encapsulating multithreading mainly revolves around abstracting and hiding underlying details of operations and logic related to multithreading, providing a simpler, easier to use and safer interface for developers to use. The following is a detailed analysis from the aspects of packaging goals, common packaging methods and the core principles behind it.

1. The goal of packaging

Simplified use: Java native multi-threaded programming involves many complex operations, such as thread creation, startup, synchronization control, etc. Through encapsulation, it can provide a simple and easy-to-use interface, allowing developers to easily use multi-threading functions without having to understand the underlying details.

Improve security: There are thread safety problems in multi-threaded programming, such as data competition, deadlock, etc. Encapsulation can implement thread-safe mechanisms internally, avoid developers making mistakes during use, and improve program stability and security.

Enhanced maintainability and scalability: Encapsulate multi-threaded logic in independent modules, making the code structure clearer and easier to maintain and expand. When it is necessary to change the implementation of multithreading, you only need to modify the internal code of the encapsulation module without affecting other parts of the use of the encapsulation.

2. Common packaging methods and principles

Encapsulation based on Runnable interface or Callable interface

Principle: The Runnable interface and the Callable interface are the basic interfaces that define thread tasks in Java. By encapsulating thread tasks in a class that implements these two interfaces, the definition of tasks and thread management can be separated. The run() method in the Runnable interface has no return value, while the call() method in the Callable interface can have a return value, which is suitable for scenarios where thread execution results need to be obtained.

The code is as follows:

import .*;
// Task class that implements the Runnable interfaceclass MyRunnableTask implements Runnable {
    @Override
    public void run() {
        ("The Runnable task is executing, thread name: " + ().getName());
    }
}
// Task class that implements Callable interfaceclass MyCallableTask implements Callable<String> {
    @Override
    public String call() throws Exception {
        return "Callable task execution result, thread name: " + ().getName();
    }
}
public class ThreadTaskWrapper {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        // Use Runnable tasks        Thread runnableThread = new Thread(new MyRunnableTask());
        ();
        // Use Callable tasks        ExecutorService executor = ();
        Future<String> future = (new MyCallableTask());
        String result = ();
        (result);
        ();
    }
}

Thread pool encapsulation

Principle: Thread pool is a mechanism for managing and reusing threads, which can avoid the performance overhead caused by frequent creation and destruction of threads. Java provides the ExecutorService interface and related implementation classes (such as ThreadPoolExecutor, Executors tool classes) to create and manage thread pools. By encapsulating thread pools, a unified interface can be provided to submit tasks, while managing thread life cycles and resource allocation.

The code is as follows:

import ;
import ;
// Classes that encapsulate thread poolsclass ThreadPoolWrapper {
    private final ExecutorService executor;
    public ThreadPoolWrapper(int poolSize) {
         = (poolSize);
    }
    public void submitTask(Runnable task) {
        (task);
    }
    public void shutdown() {
        ();
    }
}
// Use encapsulated thread poolpublic class Main {
    public static void main(String[] args) {
        ThreadPoolWrapper threadPool = new ThreadPoolWrapper(3);
        for (int i = 0; i < 5; i++) {
            final int taskId = i;
            (() -> {
                ("Task " + taskId + "Execution, thread name: " + ().getName());
            });
        }
        ();
    }
}

Summarize

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