Principles of low delayed original concurrent queue based on the Java class library
Principles of low delayed original concurrent queue based on the Java class library
Summary:
In the application scenarios that are increasingly high and real -time requirements today, the original concurrent queue has become one of the important tools for achieving low latency.This article will introduce the principle of low delayed original concurrency queue based on the Java class library, and provide relevant Java code examples.
1 Overview
The original concurrent queue is an unbounded queue that can achieve efficient multi -producer and multi -consumer model.It is designed based on the "single producer-single consumer" model, that is, each queue has only one producer and one consumer.This design can reduce the competition of locks and improve concurrency efficiency.
2. Principles
The low latency in the Java class library mainly depends on the following key technical points:
2.1 No lock queue
In order to achieve low latency and high composite performance, the original concurrent queue uses the data structure of the lock -free queue.The lock -free queue implements the operation of the queue through the operation of the CAS (Compaare and Swap) to avoid the performance loss caused by the lock.
2.2 memory barrier
Memory barrier is a type of hardware instruction, which can ensure the execution order of the instruction sequence and refresh the cache at the same time.In the original concurrent queue, the use of memory barrier can ensure the visibility and order of data, and to avoid problems caused by the re -arrangement of instructions.
2.3 Caches Fill
The cache line is a memory read and write unit in a computer, usually 64 bytes.Due to the storage method of the cache line, the modification of a mito -deposit will affect other data in the same cache.The original concurrent queue uses cache -filling technology to distribute the data of the producer and consumers in different cache lines, avoiding the pseudo -sharing of the data and improving the concurrency performance.
3. Java code example
The following is a simple example of the low latency original concurrent queue based on the Java class library:
import java.util.concurrent.ConcurrentLinkedQueue;
public class LowLatencyQueueExample {
private static ConcurrentLinkedQueue<Integer> queue = new ConcurrentLinkedQueue<>();
public static void main(String[] args) throws InterruptedException {
Thread producerThread = new Thread(() -> {
for (int i = 0; i < 100; i++) {
queue.offer(i);
}
});
Thread consumerThread = new Thread(() -> {
for (int i = 0; i < 100; i++) {
Integer value = queue.poll();
System.out.println("Consumed: " + value);
}
});
producerThread.start();
consumerThread.start();
producerThread.join();
consumerThread.join();
}
}
In the above examples, we use the `ConcurrentlinkEdqueue` class as the implementation of the original concurrent queue. The` Offer () method is used to add the data to the queue, and the method is used to obtain data from the queue.
By running the above examples, consumers can obtain data in time after the production data is produced, achieving a low -delayed concurrent queue effect.
in conclusion:
The low -delayed original concurrent queue based on the Java class library is an important tool for achieving high -efficiency multi -producers and multi -consumer models.It uses key technologies such as lock -free queue, memory barrier, and cache filling to improve concurrent performance and reduce delay.Developers can choose the appropriate concurrency queue according to specific needs, such as `ConcurrentLinkedQueueme`,` Disrutor`, etc.
