Use the DISRUPTOR framework to implement the lock -free data structure of the Java class library
Use the DISRUPTOR framework to implement the lock -free data structure of the Java class library
introduce:
In multi -threaded concurrent programming, locks are one of the commonly used synchronization mechanisms, but too much lock use can cause thread competition and dead locks, thereby reducing the efficiency of the program.To solve this problem, no locking data structure came into being.DISRUPTOR is a high -performance -free framework that implements concurrent programming through lock -free way to improve the performance of the program.This article will introduce how to use the DISRUPTOR framework to implement the lock -free data structure of the Java class library and provide relevant Java code examples.
1. Overview of DISRUPTOR framework
Disruptor is a high -performance non -lock queue framework developed by LMAX Exchange. It is widely used in the financial field to meet the needs of high throughput and low latency.Its core idea is to use the Ring Buffer and Event Processor to achieve efficient transmission and processing of messages.
Second, the implementation of the unlocking data structure
The ring buffer in DISRUPTOR is an important foundation for lock -free data structures.It can be regarded as an array of ring -shaped for transmission data between different producers and consumers.Each element is called an event (Event), which is identified by serial number.
The main steps of using DISRUPTOR to implement the lock -free data structure are as follows:
1. Define event (Event):
First of all, it is necessary to define an event class for packaging and processing data that needs to be passed and processed.The event class needs to implement the EVENT interface provided by the DISRUPTOR library.
Example code:
public class MyEvent {
private String data;
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
}
2. Write event processor:
Event processor is a core component for processing events.In Disruptor, the EventHandler interface needs to be implemented, and the Onevent method is required to handle events.
Example code:
public class MyEventHandler implements EventHandler<MyEvent> {
@Override
public void onEvent(MyEvent event, long sequence, boolean endOfBatch) {
// Treat the logic of the event
System.out.println ("Processing event:" + event.getdata ());
}
}
3. Create DISRUPTOR objects:
Create a DISRUPTOR object through the static method of the DISRUPTOR class, which needs to be introduced into the event class and event processor class.Set the event processor by calling the HandleEventswith method of the DISRUPTOR object.
Example code:
Disruptor<MyEvent> disruptor = new Disruptor<>(MyEvent::new, bufferSize, executor);
disruptor.handleEventsWith(new MyEventHandler());
4. Start DISRUPTOR:
Call the Start method of the DISRUPTOR object and start the Disruptor framework.
Example code:
disruptor.start();
5. Release event:
Publish an event through the Publishevent method of the DISRUPTOR object.
Example code:
RingBuffer<MyEvent> ringBuffer = disruptor.getRingBuffer();
long sequence = ringBuffer.next();
MyEvent event = ringBuffer.get(sequence);
event.setData("Hello Disruptor");
ringBuffer.publish(sequence);
3. Summary
This article introduces how to use the DISRUPTOR framework to implement the lock -free data structure of the Java class library.Through the DISRUPTOR framework, we can efficiently handle the complication of multi -threaded and improve the performance and response ability of the program.Using DISRUPTOR needs to pay attention to the definition of the event and the writing of the event processor, and the use of the functions provided by it can achieve a complex lock -free data structure.
Reference materials:
-Disruptor official document: https://lmax-exchange.github.io/disrutor/
-Disruptor github warehouse: https://github.com/lmax-sexchange/disruptor
