JUnit tests

semaphore/src/main/java/com/iluwatar/semaphore/Semaphore.java

@@ -27,13 +27,29 @@ package com.iluwatar.semaphore;
  */
 public class Semaphore implements Lock {
 
+  private final int licenses;
   /**
    * The number of concurrent resource accesses which are allowed.
    */
   private int counter;
     
-  public Semaphore(int counter) {
-    this.counter = counter;    
+  public Semaphore(int licenses) {
+    this.licenses = licenses;
+    this.counter = licenses;    
+  }
+  
+  /**
+   * Returns the number of licenses managed by the Semaphore
+   */
+  public int getNumLicenses() {
+    return licenses;
+  }
+  
+  /**
+   * Returns the number of available licenses
+   */
+  public int getAvailableLicenses() {
+    return counter; 
   }
   
   /**
@@ -52,8 +68,10 @@ public class Semaphore implements Lock {
    * Method called by a thread to release the lock.
    */
   public synchronized void release() {
-    counter = counter + 1;
-    notify();
+    if (counter < licenses) {
+      counter = counter + 1;
+      notify();
+    }
   }
 
 }