All Known Implementing Classes:

DefaultDnsCache, NoopDnsCache
```
public interface DnsCache
```
A cache for DNS resolution entries.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`DnsCacheEntry`	`cache(String hostname, DnsRecord[] additionals, Throwable cause, EventLoop loop)`	Cache the resolution failure for a given hostname.
`DnsCacheEntry`	`cache(String hostname, DnsRecord[] additionals, InetAddress address, long originalTtl, EventLoop loop)`	Create a new `DnsCacheEntry` and cache a resolved address 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.

- Method Detail
  - clear
```
void clear()
```
    Clears all the resolved addresses cached by this resolver.
    
    See Also:
    
    clear(String)
  - clear
```
boolean clear(String hostname)
```
    Clears the resolved addresses of the specified host name from the cache of this resolver.
    
    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
```
List<? extends DnsCacheEntry> get(String hostname,
                                  DnsRecord[] additionals)
```
    Return the cached entries for the given hostname.
    
    Parameters:
    
    hostname - the hostname
    
    additionals - the additional records
    
    Returns:
    
    the cached entries
  - cache
```
DnsCacheEntry cache(String hostname,
                    DnsRecord[] additionals,
                    InetAddress address,
                    long originalTtl,
                    EventLoop loop)
```
    Create a new DnsCacheEntry and cache a resolved address for a given hostname.
    
    Parameters:
    
    hostname - the hostname
    
    additionals - the additional records
    
    address - the resolved address
    
    originalTtl - the TLL as returned by the DNS server
    
    loop - the EventLoop used to register the TTL timeout
    
    Returns:
    
    The DnsCacheEntry corresponding to this cache entry.
  - cache
```
DnsCacheEntry cache(String hostname,
                    DnsRecord[] additionals,
                    Throwable cause,
                    EventLoop loop)
```
    Cache the resolution failure for a given hostname. Be aware this won't be called with timeout / cancel / transport exceptions.
    
    Parameters:
    
    hostname - the hostname
    
    additionals - 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.

Interface DnsCache

Method Summary

Method Detail

clear

clear

get

cache

cache