tigase.util

Class DNSResolverDefault

java.lang.Object

tigase.util.DNSResolverDefault

All Implemented Interfaces:

DNSResolverIfc

public class DNSResolverDefault
extends Object
implements DNSResolverIfc

DNSResolver class for handling DNS names

Field Summary

Fields

Modifier and Type	Field and Description
static Map<String,DNSEntry>	ip_cache
static Map<String,DNSEntry[]>	srv_cache

Fields inherited from interface tigase.util.DNSResolverIfc

rand, TIGASE_PRIMARY_ADDRESS, TIGASE_SECONDARY_ADDRESS

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DNSResolverDefault()

Method Summary

Modifier and Type	Method and Description
String	getDefaultHost() Method provides default host information for the installation.
String[]	getDefaultHosts() Method provides an array of all local host informations, by default it contains defaultHost.
String[]	getHostIPs(String hostname) Resolve all IP addresses for the given hostname
DNSEntry[]	getHostSRV_Entries(String hostname, String service, int defPort) Retrieves list of DNS entries for given hostname.
String	getSecondaryHost() Method provides alternative host information for the current instance.
static void	main(String[] args) main method outputting various information about hostnames

Methods inherited from class java.lang.Object

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

Methods inherited from interface tigase.util.DNSResolverIfc

getHostIP, getHostSRV_Entries, getHostSRV_Entry, getHostSRV_Entry, getHostSRV_IP

Field Detail

srv_cache

public static Map<String,DNSEntry[]> srv_cache

ip_cache

public static Map<String,DNSEntry> ip_cache

Constructor Detail

DNSResolverDefault

protected DNSResolverDefault()

Method Detail

main

public static void main(String[] args)
                 throws Exception

main method outputting various information about hostnames

Parameters:

args - a String[] containing domains to query, if none provided default one will be used

Throws:

Exception

getDefaultHosts

public String[] getDefaultHosts()

Description copied from interface: DNSResolverIfc

Method provides an array of all local host informations, by default it contains defaultHost.

Specified by:

getDefaultHosts in interface DNSResolverIfc

Returns:

an array of all local hosts.

getDefaultHost

public String getDefaultHost()

Description copied from interface: DNSResolverIfc

Method provides default host information for the installation. It can be both hostname or IP address.

Specified by:

getDefaultHost in interface DNSResolverIfc

Returns:

a default host information.

getSecondaryHost

public String getSecondaryHost()

Description copied from interface: DNSResolverIfc

Method provides alternative host information for the current instance. By default falls back to the default host information.

Specified by:

getSecondaryHost in interface DNSResolverIfc

Returns:

alternative host information.

getHostIPs

public String[] getHostIPs(String hostname)
                    throws UnknownHostException

Resolve all IP addresses for the given hostname

Specified by:

getHostIPs in interface DNSResolverIfc

Parameters:

hostname - the domain name for which this record is valid

Returns:

Array of all IP addresses on which target host provide service.

Throws:

UnknownHostException

getHostSRV_Entries

public DNSEntry[] getHostSRV_Entries(String hostname,
                                     String service,
                                     int defPort)
                              throws UnknownHostException

Description copied from interface: DNSResolverIfc

Retrieves list of DNS entries for given hostname. Allow specifying particular type of SRV record.

Specified by:

getHostSRV_Entries in interface DNSResolverIfc

Parameters:

hostname - the domain name for which this record is valid

service - type of SRV records, for example _xmpp-server._tcp

defPort - default port number in case DNS records is missing one.

Returns:

Array of the DNSEntry records

Throws:

UnknownHostException