Package com.alibaba.dcm.internal

Class InetAddressCacheUtilForJdk9Plus

java.lang.Object

com.alibaba.dcm.internal.InetAddressCacheUtilForJdk9Plus

public class InetAddressCacheUtilForJdk9Plus
extends Object

Util class to manipulate dns cache for JDK 9+.

dns cache is InetAddress.cache.

Since:

1.6.0

Author:

antfling (ding_zhengang at hithinksoft dot com), Jerry Lee (oldratlee at gmail dot com)

Method Summary

Modifier and Type	Method	Description
static void	clearInetAddressCache()
static DnsCacheEntry	getInetAddressCache(String host)
static DnsCache	listInetAddressCache()
static void	removeInetAddressCache(String host)
static void	setInetAddressCache(String host, String[] ips, long expireMillis)	InetAddress.CachedAddresses

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

setInetAddressCache

public static void setInetAddressCache(String host,
                                       String[] ips,
                                       long expireMillis)
                                throws UnknownHostException,
                                       IllegalAccessException,
                                       InstantiationException,
                                       InvocationTargetException,
                                       ClassNotFoundException,
                                       NoSuchFieldException

InetAddress.CachedAddresses

For jdk9+,

• need not convert host to lowercase.
  see InetAddress.CachedAddresses#CachedAddresses.
• final long expiryTime; // time of expiry (in terms of System.nanoTime())
  see InetAddress.CachedAddresses#expiryTime.

Throws:

UnknownHostException

IllegalAccessException

InstantiationException

InvocationTargetException

ClassNotFoundException

NoSuchFieldException

removeInetAddressCache

public static void removeInetAddressCache(String host)
                                   throws NoSuchFieldException,
                                          IllegalAccessException

Throws:

NoSuchFieldException

IllegalAccessException

getInetAddressCache

@Nullable
public static DnsCacheEntry getInetAddressCache(String host)
                                         throws NoSuchFieldException,
                                                IllegalAccessException,
                                                ClassNotFoundException

Throws:

NoSuchFieldException

IllegalAccessException

ClassNotFoundException

listInetAddressCache

public static DnsCache listInetAddressCache()
                                     throws NoSuchFieldException,
                                            IllegalAccessException,
                                            ClassNotFoundException

Throws:

NoSuchFieldException

IllegalAccessException

ClassNotFoundException

clearInetAddressCache

public static void clearInetAddressCache()
                                  throws NoSuchFieldException,
                                         IllegalAccessException

Throws:

NoSuchFieldException

IllegalAccessException