semaphores (#2198)

* minor logging fix * spring security sso * use basic auth * use form login * cleanup * cleanup * final cleanup * second client app for sso * spring boot bootstrap * add logic * cleanup * add simple controller * add thymeleaf and security * minor fix * minor fix * add more boot properties * fix live test * fix live test * minor fix * semaphores
2017-07-03 17:34:41 +02:00
parent 7c6a08746e
commit 20669dc6a1
4 changed files with 219 additions and 0 deletions
@@ -0,0 +1,31 @@
+package com.baeldung.concurrent.semaphores;
+
+import java.util.concurrent.Semaphore;
+
+public class CounterUsingMutex {
+
+    private final Semaphore mutex;
+    private int count;
+
+    public CounterUsingMutex() {
+        mutex = new Semaphore(1);
+        count = 0;
+    }
+
+    public void increase() throws InterruptedException {
+        mutex.acquire();
+        this.count = this.count + 1;
+        Thread.sleep(1000);
+        mutex.release();
+
+    }
+
+    public int getCount() {
+        return this.count;
+    }
+
+    public boolean hasQueuedThreads() {
+        return mutex.hasQueuedThreads();
+    }
+
+}
@@ -0,0 +1,23 @@
+package com.baeldung.concurrent.semaphores;
+
+import java.util.concurrent.TimeUnit;
+
+import org.apache.commons.lang3.concurrent.TimedSemaphore;
+
+public class DelayQueueUsingTimedSemaphore {
+
+    private final TimedSemaphore semaphore;
+
+    public DelayQueueUsingTimedSemaphore(long period, int slotLimit) {
+        semaphore = new TimedSemaphore(period, TimeUnit.SECONDS, slotLimit);
+    }
+
+    public boolean tryAdd() {
+        return semaphore.tryAcquire();
+    }
+
+    public int availableSlots() {
+        return semaphore.getAvailablePermits();
+    }
+
+}
@@ -0,0 +1,25 @@
+package com.baeldung.concurrent.semaphores;
+
+import java.util.concurrent.Semaphore;
+
+public class LoginQueueUsingSemaphore {
+
+    private final Semaphore semaphore;
+
+    public LoginQueueUsingSemaphore(int slotLimit) {
+        semaphore = new Semaphore(slotLimit);
+    }
+
+    public boolean tryLogin() {
+        return semaphore.tryAcquire();
+    }
+
+    public void logout() {
+        semaphore.release();
+    }
+
+    public int availableSlots() {
+        return semaphore.availablePermits();
+    }
+
+}