<dependency>
<groupId>net.jcip</groupId>
<artifactId>jcip-annotations</artifactId>
<version>1.0</version>
</dependency>
import java.util.HashMap;
import java.util.Map;
import net.jcip.annotations.GuardedBy;
import net.jcip.annotations.ThreadSafe;
@ThreadSafe
public class ConcurrentCache<K, V> {
@GuardedBy("this")
private final Map<K, V> cache = new HashMap<>();
public synchronized V get(K key) {
return cache.get(key);
}
public synchronized void put(K key, V value) {
cache.put(key, value);
}
}
