import io.netty.util.internal.chmv8.ConcurrentHashMapV8; //导入依赖的package包/类
/**
 * Creates a new fastest {@link ConcurrentMap} implementaion for the current platform.
 */
public static <K, V> ConcurrentMap<K, V> newConcurrentHashMap() {
	if (CAN_USE_CHM_V8) {
		return new ConcurrentHashMapV8<K, V>();
	} else {
		return new ConcurrentHashMap<K, V>();
	}
}
 

import io.netty.util.internal.chmv8.ConcurrentHashMapV8; //导入依赖的package包/类
/**
 * Creates a new fastest {@link ConcurrentMap} implementaion for the current platform.
 */
public static <K, V> ConcurrentMap<K, V> newConcurrentHashMap() {
    if (CAN_USE_CHM_V8) {
        return new ConcurrentHashMapV8<K, V>();
    } else {
        return new ConcurrentHashMap<K, V>();
    }
}
 

import io.netty.util.internal.chmv8.ConcurrentHashMapV8; //导入依赖的package包/类
/**
 * Creates a new MetricMeta
 * @param hashCode The meta's long hash code
 * @param name The name of the meta pair to initialize with
 * @param value The value of the meta pair to initialize with
 */
MetricMeta(final long hashCode, final String name, final String value) {
	this.hashCode = hashCode;
	pairs = new ConcurrentHashMapV8<String, String>(8);
	addPair(name, value);
	lastUpdate.set(System.currentTimeMillis());
}