The implementation principle of low latency original complication in the Java library
The implementation principle of low latency original complication in the Java library
introduce
Low delayed original concurrent queue is a data structure that achieves high -performance data transmission in multi -threaded environment.It can directly pass the data generated by the producer thread directly to the consumer thread, and has a very low delay.In the Java class library, ConcurrentLinkedQueue is a common low -delayed primitive concurrent queue implementation.
Implementation principle
The implementation principle of low-delayed primitive concurrent queue is based on the Lock-free algorithm and CAS (Compare and Swap) operation.The following is the main implementation principle of ConcurrentLinKedqueue:
1. Internal nodes
The internal nodes of ConcurrentlinkedQueue are linking together by a atomic variable (AtomicReference) with a reference to the next node.Each internal node contains a data element and a reference to the next node.The structure of the internal node is shown below:
class Node<E> {
final E item;
volatile Node<E> next;
// ...
}
2. Non -blocking algorithm
ConcurrentlinkedQueue uses non -blocking algorithms to handle concurrent operations to avoid locking competition.Its core idea is to use CAS operations to ensure the consistency of the data structure and allow multiple threads to perform at the same time.
3. Entry operation
When a producer thread wants to add data to the queue, it will create a new node and use CAS operation to add the node to the NEXT reference of the end node.If the CAS operation fails, it means that there are other threads performing the team at the same time, and the producer thread will try the operation until it is successful.
4. Out operation
When a consumer thread needs to obtain data from the queue, it uses CAS operation to point the NEXT reference of the head node to the next node and return the data element of the node.If the CAS operation fails, it means that there are other threads performing the operation at the same time, and the consumer thread will retry the operation until successful.
For example code
Below is a simple example code that demonstrates how to use the ConcurrentlinkedQueue to achieve low delayed original concurrent queue:
import java.util.concurrent.ConcurrentLinkedQueue;
public class ConcurrentQueueExample {
public static void main(String[] args) {
ConcurrentLinkedQueue<String> queue = new ConcurrentLinkedQueue<>();
// Producer thread
Thread producerThread = new Thread(() -> {
for (int i = 0; i < 10; i++) {
String data = "Data " + i;
queue.offer (data); // Operation of the team
System.out.println("Produced: " + data);
}
});
// Consumer thread
Thread consumerThread = new Thread(() -> {
while (!queue.isEmpty()) {
String data = queue.poll (); //
System.out.println("Consumed: " + data);
}
});
producerThread.start();
consumerThread.start();
}
}
This sample code creates a ConcurrentlinkedQueue, and starts the producer thread and consumer thread respectively.The producer thread generates 10 data and adds them to the queue in turn, and the consumer threads get data from the queue for data consumption.Since the ConcurrentlinkedQueue is safe, producers and consumer threads can be operated in parallel.
