DnsCnameCache (Netty API Reference (4.2.7.Final))

All Known Implementing Classes:

DefaultDnsCnameCache, NoopDnsCnameCache
```
public interface DnsCnameCache
```
A cache for CNAMEs.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`cache(java.lang.String hostname, java.lang.String cname, long originalTtl, EventLoop loop)`	Caches a cname entry that should be used for the given hostname.
`void`	`clear()`	Clears all cached nameservers.
`boolean`	`clear(java.lang.String hostname)`	Clears the cached nameservers for the specified hostname.
`java.lang.String`	`get(java.lang.String hostname)`	Returns the cached cname for the given hostname.

- Method Detail
  - get
```
java.lang.String get(java.lang.String hostname)
```
    Returns the cached cname for the given hostname.
    
    Parameters:
    
    hostname - the hostname
    
    Returns:
    
    the cached entries or an null if none.
  - cache
```
void cache(java.lang.String hostname,
           java.lang.String cname,
           long originalTtl,
           EventLoop loop)
```
    Caches a cname entry that should be used for the given hostname.
    
    Parameters:
    
    hostname - the hostname
    
    cname - the cname mapping.
    
    originalTtl - the TTL as returned by the DNS server
    
    loop - the EventLoop used to register the TTL timeout
  - clear
```
void clear()
```
    Clears all cached nameservers.
    
    See Also:
    
    clear(String)
  - clear
```
boolean clear(java.lang.String hostname)
```
    Clears the cached nameservers for the specified hostname.
    
    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