netty5/common/src/main/java/io/netty/util/AttributeKey.java

package io.netty.util;

import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public final class AttributeKey<T> extends UniqueName {

    private static final ConcurrentMap<String, Boolean> names = new ConcurrentHashMap<String, Boolean>();

    public AttributeKey(String name) {
        super(names, name);
    }
}