Package com.wavefront.agent.channel

Class CachingHostnameLookupResolver

java.lang.Object

com.wavefront.agent.channel.CachingHostnameLookupResolver

All Implemented Interfaces:

Function<InetAddress,String>

public class CachingHostnameLookupResolver
extends Object
implements Function<InetAddress,String>

Convert InetAddress to String, either by performing reverse DNS lookups (cached, as the name implies), or by converting IP addresses into their string representation.

Author:

[email protected]

Constructor Summary

Constructors

Constructor	Description
CachingHostnameLookupResolver()	Create a new instance with all default settings: - rDNS lookup enabled - no cache size metric - max 5000 elements in the cache - 5 minutes refresh TTL - 1 hour expiry TTL
CachingHostnameLookupResolver(boolean disableRdnsLookup, com.yammer.metrics.core.MetricName metricName)	Create a new instance with default cache settings: - max 5000 elements in the cache - 5 minutes refresh TTL - 1 hour expiry TTL
CachingHostnameLookupResolver(boolean disableRdnsLookup, com.yammer.metrics.core.MetricName metricName, int maxSize, Duration cacheRefreshTtl, Duration cacheExpiryTtl)	Create a new instance with specific cache settings:

Method Summary

Modifier and Type	Method	Description
String	apply(InetAddress addr)
static InetAddress	getRemoteAddress(io.netty.channel.ChannelHandlerContext ctx)

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.Function

andThen, compose

Constructor Detail

CachingHostnameLookupResolver

public CachingHostnameLookupResolver()

Create a new instance with all default settings: - rDNS lookup enabled - no cache size metric - max 5000 elements in the cache - 5 minutes refresh TTL - 1 hour expiry TTL

CachingHostnameLookupResolver

public CachingHostnameLookupResolver(boolean disableRdnsLookup,
                                     @Nullable
                                     com.yammer.metrics.core.MetricName metricName)

Create a new instance with default cache settings: - max 5000 elements in the cache - 5 minutes refresh TTL - 1 hour expiry TTL

Parameters:

disableRdnsLookup - if true, simply return a string representation of the IP address

metricName - if specified, use this metric for the cache size gauge.

CachingHostnameLookupResolver

public CachingHostnameLookupResolver(boolean disableRdnsLookup,
                                     @Nullable
                                     com.yammer.metrics.core.MetricName metricName,
                                     int maxSize,
                                     Duration cacheRefreshTtl,
                                     Duration cacheExpiryTtl)

Create a new instance with specific cache settings:

Parameters:

disableRdnsLookup - if true, simply return a string representation of the IP address.

metricName - if specified, use this metric for the cache size gauge.

maxSize - max cache size.

cacheRefreshTtl - trigger cache refresh after specified duration

cacheExpiryTtl - expire items after specified duration

Method Detail

apply

public String apply(InetAddress addr)

Specified by:

apply in interface Function<InetAddress,String>

getRemoteAddress

public static InetAddress getRemoteAddress(io.netty.channel.ChannelHandlerContext ctx)