BAEL-3139: Moved code to a new project core-java-concurrency-2 (#7778)

core-java-modules/core-java-concurrency-2/src/main/java/com/baeldung/concurrent/mutex/SequenceGenerator.java

@@ -0,0 +1,12 @@
+package com.baeldung.concurrent.mutex;
+
+public class SequenceGenerator {
+
+    private int currentValue = 0;
+
+    public int getNextSequence() {
+        currentValue = currentValue + 1;
+        return currentValue;
+    }
+
+}

core-java-modules/core-java-concurrency-2/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingMonitor.java

@@ -0,0 +1,19 @@
+package com.baeldung.concurrent.mutex;
+
+import com.google.common.util.concurrent.Monitor;
+
+public class SequenceGeneratorUsingMonitor extends SequenceGenerator {
+
+    private Monitor mutex = new Monitor();
+
+    @Override
+    public int getNextSequence() {
+        mutex.enter();
+        try {
+            return super.getNextSequence();
+        } finally {
+            mutex.leave();
+        }
+    }
+
+}

core-java-modules/core-java-concurrency-2/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingReentrantLock.java

@@ -0,0 +1,19 @@
+package com.baeldung.concurrent.mutex;
+
+import java.util.concurrent.locks.ReentrantLock;
+
+public class SequenceGeneratorUsingReentrantLock extends SequenceGenerator {
+
+    private ReentrantLock mutex = new ReentrantLock();
+
+    @Override
+    public int getNextSequence() {
+        try {
+            mutex.lock();
+            return super.getNextSequence();
+        } finally {
+            mutex.unlock();
+        }
+    }
+
+}

core-java-modules/core-java-concurrency-2/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingSemaphore.java

@@ -0,0 +1,21 @@
+package com.baeldung.concurrent.mutex;
+
+import java.util.concurrent.Semaphore;
+
+public class SequenceGeneratorUsingSemaphore extends SequenceGenerator {
+
+    private Semaphore mutex = new Semaphore(1);
+
+    @Override
+    public int getNextSequence() {
+        try {
+            mutex.acquire();
+            return super.getNextSequence();
+        } catch (InterruptedException e) {
+            throw new RuntimeException("Exception in critical section.", e);
+        } finally {
+            mutex.release();
+        }
+    }
+
+}

core-java-modules/core-java-concurrency-2/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingSynchronizedBlock.java

@@ -0,0 +1,14 @@
+package com.baeldung.concurrent.mutex;
+
+public class SequenceGeneratorUsingSynchronizedBlock extends SequenceGenerator {
+
+    private Object mutex = new Object();
+
+    @Override
+    public int getNextSequence() {
+        synchronized (mutex) {
+            return super.getNextSequence();
+        }
+    }
+
+}

core-java-modules/core-java-concurrency-2/src/main/java/com/baeldung/concurrent/mutex/SequenceGeneratorUsingSynchronizedMethod.java

@@ -0,0 +1,10 @@
+package com.baeldung.concurrent.mutex;
+
+public class SequenceGeneratorUsingSynchronizedMethod extends SequenceGenerator {
+
+    @Override
+    public synchronized int getNextSequence() {
+        return super.getNextSequence();
+    }
+
+}

core-java-modules/core-java-concurrency-2/src/main/resources/logback.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <logger name="org.springframework" level="WARN" />
+    <logger name="org.springframework.transaction" level="WARN" />
+
+    <!-- in order to debug some marshalling issues, this needs to be TRACE -->
+    <logger name="org.springframework.web.servlet.mvc" level="WARN" />
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>