How to use the THERORE CONCURRENCY framework and best practice
Concurrent is an important concept in modern computer programming. It allows multiple tasks to perform simultaneously to improve the efficiency and performance of the program.A common problem of concurrent programming is the competition of resource, that is, multiple tasks access to shared resources at the same time.To solve this problem, developers can use concurrent frameworks to manage and coordinate tasks.
In the Java programming language, Java provides a wealth of concurrent programming functions. One of the important concurrent frameworks is the "java.util.concurrent" package in the concurrent library of Java.This package provides a powerful and easy -to -use concurrent framework, including thread pools, locks, condition variables, blocking queues, etc.The use and best practice of concurrent framework will be introduced below.
1. Use the thread pool management thread:
In concurrent programming, creating and destroying threads are very expensive operations.Using a thread pool can reuse threads in a shared thread pool to reduce the expenses of thread creation and destroy.The following is a simple example of using a thread pool:
ExecutorService executor = Executors.newFixedThreadPool(5);
for (int i = 0; i < 10; i++) {
Runnable worker = new MyRunnable();
executor.execute(worker);
}
executor.shutdown();
while (!executor.isTerminated()) {
}
2. Use lock protection sharing resources:
When multiple tasks access shared resources, the lock mechanism must be used to protect the consistency and visibility of the resources.Java provides the "RENTRANTLOCK" class as an implementation of a recurrence lock.The following is a simple example of using locks:
class Counter {
private int count = 0;
private Lock lock = new ReentrantLock();
public void increment() {
lock.lock();
try {
count++;
} finally {
lock.unlock();
}
}
public int getCount() {
return count;
}
}
3. Use condition variables to implement thread collaboration:
When one thread needs to wait for another thread to meet a certain condition, condition variables can be used to achieve thread collaboration.Java's "Condition" interface provides the function of condition variables.The following is an example of a simple condition variable:
class Queue {
private Queue<String> queue = new LinkedList<>();
private Lock lock = new ReentrantLock();
private Condition notEmpty = lock.newCondition();
public String take() throws InterruptedException {
lock.lock();
try {
while (queue.isEmpty()) {
notEmpty.await();
}
return queue.poll();
} finally {
lock.unlock();
}
}
public void put(String item) {
lock.lock();
try {
queue.offer(item);
notEmpty.signal();
} finally {
lock.unlock();
}
}
}
4. Use the blocking queue to implement the producer-consumer model:
In the producer-consumer model, one or more producers generate data, one or more consumer thread processing data.In order to achieve the producer-consumer model, the blocking queue can be used. Java's "BlockingQueue" provides such a function.The following is an example of a simple producer-consumer model:
class Producer implements Runnable {
private BlockingQueue<String> queue;
public Producer(BlockingQueue<String> queue) {
this.queue = queue;
}
public void run() {
try {
while (true) {
String item = produceItem();
queue.put(item);
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
private String produceItem() {
// The logic of production data
}
}
class Consumer implements Runnable {
private BlockingQueue<String> queue;
public Consumer(BlockingQueue<String> queue) {
this.queue = queue;
}
public void run() {
try {
while (true) {
String item = queue.take();
consumeItem(item);
}
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
}
}
private void consumeItem(String item) {
// Processing the logic of data
}
}
public class Main {
public static void main(String[] args) {
BlockingQueue<String> queue = new ArrayBlockingQueue<>(10);
ExecutorService executor = Executors.newFixedThreadPool(2);
Producer producer = new Producer(queue);
Consumer consumer = new Consumer(queue);
executor.execute(producer);
executor.execute(consumer);
executor.shutdown();
}
}
Through reasonable use of concurrent framework, developers can easily deal with problems in concurrent programming and improve the efficiency and performance of the program.The methods and examples mentioned above are just the tip of the iceberg of concurrent programming. Developers should choose the most suitable concurrency framework and practical method according to specific needs and scenarios.
