BAEL-7022 (#14984)

* BAEL-6706 source code

* BAEL-7022 implemented

core-java-modules/core-java-concurrency-advanced-5/pom.xml

@@ -0,0 +1,36 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+
+    <modelVersion>4.0.0</modelVersion>
+    <artifactId>core-java-concurrency-advanced-5</artifactId>
+    <name>core-java-concurrency-advanced-5</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung.core-java-modules</groupId>
+        <artifactId>core-java-modules</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+    </parent>
+
+    <build>
+        <finalName>core-java-concurrency-advanced-5</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
+</project>

core-java-modules/core-java-concurrency-advanced-5/src/main/java/com/baeldung/wait_synchronization/ConditionChecker.java

@@ -0,0 +1,24 @@
+package com.baeldung.wait_synchronization;
+
+public class ConditionChecker {
+
+    private volatile Boolean jobIsDone;
+    private final Object lock = new Object();
+
+    public void ensureCondition() {
+        synchronized (lock) {
+            while (!jobIsDone) {
+                try {
+                    lock.wait();
+                } catch (InterruptedException e) { }
+            }
+        }
+    }
+
+    public void complete() {
+        synchronized (lock) {
+            jobIsDone = true;
+            lock.notify();
+        }
+    }
+}

core-java-modules/core-java-concurrency-advanced-5/src/test/java/com/baeldung/wait_synchronization/ConditionCheckerUnitTest.java

@@ -0,0 +1,22 @@
+package com.baeldung.wait_synchronization;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+
+import org.assertj.core.api.Assertions;
+import org.junit.jupiter.api.Test;
+
+class ConditionCheckerUnitTest {
+
+    @Test
+    public void givenBothMethodsAreSynchronized_whenBothMethodsAreCalled_thenNoExceptionsOrDeadlocks() {
+        ConditionChecker conditionChecker = new ConditionChecker();
+
+        ExecutorService executorService = Executors.newFixedThreadPool(2);
+
+        Assertions.assertThatCode(() -> {
+            executorService.submit(conditionChecker::ensureCondition);
+            executorService.submit(conditionChecker::complete);
+        }).doesNotThrowAnyException();
+    }
+}