Package tigase.util.dns

Class DNSResolverDefault

java.lang.Object

tigase.util.dns.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	Description
static Map<String,DNSEntry>	ip_cache
static Map<String,DNSEntry[]>	srv_cache

Fields inherited from interface tigase.util.dns.DNSResolverIfc

rand, TIGASE_PRIMARY_ADDRESS, TIGASE_SECONDARY_ADDRESS

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	DNSResolverDefault()

Method Summary

Modifier and Type	Method	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	getPrimaryHost()
String	getSecondaryHost()	Method provides alternative host information for the current instance.
protected static boolean	isHostValid(String host)
static void	main(String[] args)	main method outputting various information about hostnames
void	setPrimaryHost(String tigasePrimaryHost)
void	setSecondaryHost(String tigaseSecondaryHost)

Methods inherited from class java.lang.Object

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

Methods inherited from interface tigase.util.dns.DNSResolverIfc

getHostIP, getHostSRV_Entries, getHostSRV_Entry, getHostSRV_Entry, getHostSRV_IP

Field Details

ip_cache

public static Map<String,DNSEntry> ip_cache

srv_cache

public static Map<String,DNSEntry[]> srv_cache

Constructor Details

DNSResolverDefault

protected DNSResolverDefault()

Method Details

isHostValid

protected static boolean isHostValid(String host)

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.

getPrimaryHost

public String getPrimaryHost()

setPrimaryHost

public void setPrimaryHost(String tigasePrimaryHost)

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.

setSecondaryHost

public void setSecondaryHost(String tigaseSecondaryHost)

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