package org.opendaylight.netvirt.vpnmanager.iplearn;
-import com.google.common.base.Optional;
import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import java.util.List;
import java.util.Objects;
+import java.util.Optional;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;
import org.apache.commons.lang3.tuple.ImmutablePair;