Tutorial on the Semaphore class, used to control allocation of limited resources such as database connections in Java 5
importjava.util.concurrent.Semaphore;publicclassBoundedBuffer<T>{privatefinalSemaphoreitems;privatefinalSemaphorespaces;privatefinalT[]buffer;privateintin,out;publicBoundedBuffer(intbufferSize){this.items=newSemaphore(0);this.spaces=newSemaphore(bufferSize);this.buffer=(T[])newObject[bufferSize];this.in=...
1. 完整可运行代码 import java.util.concurrent.*;import java.util.concurrent.locks.*;public class SemaphoreDemo {// 数据库连接池实现static class ConnectionPool {private final Semaphore semaphore;private final BlockingQueue<Connection> pool;public ConnectionPool(int poolSize) {this.semaphore = new Sema...
When used in this way, the binary semaphore has the property (unlike many java.util.concurrent.locks.Lock implementations), that the "lock" can be released by a thread other than the owner (as semaphores have no notion of ownership). This can be useful in some specialized ...
importjava.util.concurrent.Semaphore;publicclassSemaphoreExample{privatestaticSemaphoresemaphore=newSemaphore(2);// 创建信号量实例publicstaticvoidmain(String[]args){// 创建多个线程并启动for(inti=0;i<5;i++){newThread(newWorker(),"Thread "+i).start();}}staticclassWorkerimplementsRunnable{@Overridepub...
public class ResourcePool<T> { private final Semaphore sem = new Semaphore(MAX_RESOURCES, true); private final Queue<T> resources = new ConcurrentLinkedQueue<T>(); public T getResource(long maxWaitMillis) throws InterruptedException, ResourceCreationException { // First, get permission to take ...
代码语言:java AI代码解释 publicclassSemaphoreCase{publicstaticvoidmain(String[]args){Runnablecustomer=newRunnable(){SemaphoreavailableTable=newSemaphore(5,true);intcount=1;@Overridepublicvoidrun(){inttime=RandomUtil.randomInt(1,10);intnum=count++;try{availableTable.acquire();System.out.println("第【...
In this tutorial, we are going to see about Semaphore in java. Semaphore is a class in java.util.concurrent package introduced in JDK 5. Semaphore basically maintains a set of permits, so there are two methods which are mainly used for semaphore. acquire release acquire() method is used ...
Read More:How to Use Locks in Java 2. How to Use a Semaphore? To demonstrate the concept, we willuse a semaphore to control 3 printers that can print multiple documents simultaneously. 2.1. PrintingJob This class represents an independent printing job that could be submitted to the print...
importjava.util.concurrent.Semaphore;publicclassSemaphoreExample{publicstaticvoidmain(String[]args){intnumberOfResources=3;Semaphoresemaphore=newSemaphore(numberOfResources);for(inti=0;i<5;i++){newThread(newResourceUser(semaphore,i)).start();}}}classResourceUserimplementsRunnable{privatefinalSemaphoresemaph...