Data commit

Task/Metered-concurrency/Java/metered-concurrency.java

@@ -0,0 +1,59 @@
+public class CountingSemaphore{
+   private int lockCount = 0;
+   private int maxCount;
+
+   CountingSemaphore(int Max){
+      maxCount = Max;
+   }
+
+   public synchronized void acquire() throws InterruptedException{
+      while( lockCount >= maxCount){
+         wait();
+      }
+      lockCount++;
+   }
+   public synchronized void release(){
+      if (lockCount > 0)
+      {
+         lockCount--;
+         notifyAll();
+      }
+   }
+   public synchronized int getCount(){
+      return lockCount;
+   }
+}
+
+public class Worker extends Thread{
+   private CountingSemaphore lock;
+   private int id;
+
+   Worker(CountingSemaphore coordinator, int num){
+      lock = coordinator;
+      id = num;
+   }
+   Worker(){
+   }
+   public void run(){
+      try{
+         lock.acquire();
+         System.out.println("Worker " + id + " has acquired the lock.");
+         sleep(2000);
+      }
+      catch (InterruptedException e){
+      }
+      finally{
+         lock.release();
+      }
+   }
+   public static void main(String[] args){
+      CountingSemaphore lock = new CountingSemaphore(3);
+      Worker crew[];
+      crew = new Worker[5];
+      for (int i = 0; i < 5; i++){
+         crew[i] = new Worker(lock, i);
+         crew[i].start();
+      }
+
+   }
+}