Detailed explanation of the technical principles of the Java class library medium high -frequency transaction (HFT) collection framework
Detailed explanation of the technical principles of the Java class library medium high -frequency transaction (HFT) collection framework
High-Frequency Trading (HFT) is a trading strategy that uses high-speed computers and complex algorithms for fast transaction.The goal of HFT is to use small market changes to obtain profits, so the requirements for execution are very high.To meet this requirement, the Java class library provides some set frameworks specifically for HFT development. This article will introduce the principles of these technologies in detail.
The technical principles of the HFT collection framework in the Java class library mainly include the following aspects:
1. Quick data structure: In HFT, data storage and access speed are crucial.The HFT set framework in the Java class library usually uses an array -based structure to improve the access efficiency.For example, the CustomQueue built with several array can achieve fast enquisis and Dequeue operations.
Code example:
public class CustomQueue<T> {
private T[] queue;
private int front;
private int rear;
public CustomQueue(int capacity) {
queue = (T[]) new Object[capacity];
front = rear = -1;
}
public void enqueue(T item) {
if (rear == queue.length - 1) {
throw new IllegalStateException("Queue is full");
}
queue[++rear] = item;
}
public T dequeue() {
if (isEmpty()) {
throw new NoSuchElementException("Queue is empty");
}
return queue[++front];
}
public boolean isEmpty() {
return front == rear;
}
}
2. Non -blocking algorithm: In HFT, the trading system needs to reduce lock competition as much as possible to improve the efficiency of concurrent execution.To this end, the HFT set framework in the Java class library usually uses non -blocking algorithms, such as CAS (Compare and Swap) operation to achieve data competition control between multi -threaded.CAS operation is an operation based on hardware atom instructions that can ensure atomicity and avoid lock waiting.
Code example:
class NonBlockingCounter {
private volatile int value;
public int getValue() {
return value;
}
public void increment() {
int current;
do {
current = value;
} while (!unsafe.compareAndSwapInt(this, offset, current, current + 1));
}
}
3. Zero copy technology: In HFT, in order to increase the speed of data transmission and reduce the overhead of the CPU and memory, the HFT set framework in the Java class library usually uses zero copy technology to achieve data transmission.Zero copy technology reads the data directly from the network or disk through the method of direct memory access or memory mapping file without the need for the middle buffer.This can avoid data copying and replication and improve data transmission efficiency.
Code example:
try (FileChannel channel = FileChannel.open(Paths.get(path), StandardOpenOption.READ)) {
long fileSize = channel.size();
MappedByteBuffer buffer = channel.map(FileChannel.MapMode.READ_ONLY, 0, fileSize);
// Process the buffer directly without copying data
// ...
}
In summary, the HFT collection framework in the Java class library has achieved high -speed data access, low -delay transactions, and efficient data transmission through technical principles such as rapid data structure, non -blocking algorithm and zero copy technology.HFT has high requirements for execution speed.These technical principles are of great significance for developing and optimizing the high -frequency trading system.
