io.netty.resolver.dns

Class NoopDnsCache

java.lang.Object

io.netty.resolver.dns.NoopDnsCache

All Implemented Interfaces:

DnsCache

public final class NoopDnsCache
extends Object
implements DnsCache

A noop DNS cache that actually never caches anything.

Field Summary

Fields

Modifier and Type	Field and Description
static NoopDnsCache	INSTANCE

Method Summary

Modifier and Type	Method and Description
DnsCacheEntry	cache(String hostname, DnsRecord[] additional, InetAddress address, long originalTtl, EventLoop loop) Create a new DnsCacheEntry and cache a resolved address for a given hostname.
DnsCacheEntry	cache(String hostname, DnsRecord[] additional, Throwable cause, EventLoop loop) Cache the resolution failure for a given hostname.
void	clear() Clears all the resolved addresses cached by this resolver.
boolean	clear(String hostname) Clears the resolved addresses of the specified host name from the cache of this resolver.
List<? extends DnsCacheEntry>	get(String hostname, DnsRecord[] additionals) Return the cached entries for the given hostname.
String	toString()

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

INSTANCE

public static final NoopDnsCache INSTANCE

Method Detail

clear

public void clear()

Description copied from interface: DnsCache

Clears all the resolved addresses cached by this resolver.

Specified by:

clear in interface DnsCache

See Also:

DnsCache.clear(String)

clear

public boolean clear(String hostname)

Description copied from interface: DnsCache

Clears the resolved addresses of the specified host name from the cache of this resolver.

Specified by:

clear in interface DnsCache

Returns:

true if and only if there was an entry for the specified host name in the cache and it has been removed by this method

get

public List<? extends DnsCacheEntry> get(String hostname,
                                         DnsRecord[] additionals)

Description copied from interface: DnsCache

Return the cached entries for the given hostname.

Specified by:

get in interface DnsCache

Parameters:

hostname - the hostname

additionals - the additional records

Returns:

the cached entries

cache

public DnsCacheEntry cache(String hostname,
                           DnsRecord[] additional,
                           InetAddress address,
                           long originalTtl,
                           EventLoop loop)

Description copied from interface: DnsCache

Create a new DnsCacheEntry and cache a resolved address for a given hostname.

Specified by:

cache in interface DnsCache

Parameters:

hostname - the hostname

additional - the additional records

address - the resolved address

originalTtl - the TTL as returned by the DNS server

loop - the EventLoop used to register the TTL timeout

Returns:

The DnsCacheEntry corresponding to this cache entry.

cache

public DnsCacheEntry cache(String hostname,
                           DnsRecord[] additional,
                           Throwable cause,
                           EventLoop loop)

Description copied from interface: DnsCache

Cache the resolution failure for a given hostname. Be aware this won't be called with timeout / cancel / transport exceptions.

Specified by:

cache in interface DnsCache

Parameters:

hostname - the hostname

additional - the additional records

cause - the resolution failure

loop - the EventLoop used to register the TTL timeout

Returns:

The DnsCacheEntry corresponding to this cache entry, or null if this cache doesn't support caching failed responses.

toString

public String toString()

Overrides:

toString in class Object