org.masukomi.aspirin.core.dns

Class DnsResolver

java.lang.Object

org.masukomi.aspirin.core.dns.DnsResolver

public class DnsResolver
extends Object

This object checks all DNS contents and get MX records for emails. TODO Create DNS cache

Author:

Laszlo Solova

Field Summary

Fields

Modifier and Type	Field and Description
private static org.slf4j.Logger	log
static String	SMTP_PROTOCOL_PREFIX

Constructor Summary

Constructors

Constructor and Description
DnsResolver()

Method Summary

Methods

Modifier and Type	Method and Description
static Collection<javax.mail.URLName>	getMXRecordsForHost(String hostName) This method gives back the host name(s) where we can send the email.

Methods inherited from class java.lang.Object

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

Field Detail

log

private static final org.slf4j.Logger log

SMTP_PROTOCOL_PREFIX

public static final String SMTP_PROTOCOL_PREFIX

See Also:

Constant Field Values

Constructor Detail

DnsResolver

public DnsResolver()

Method Detail

getMXRecordsForHost

public static Collection<javax.mail.URLName> getMXRecordsForHost(String hostName)

This method gives back the host name(s) where we can send the email. It is copied from it's original place in RemoteDelivery object.

First time we ask DNS to find MX record(s) of a domain name. If no MX records are found, we check the upper level domains (if exists). At last we try to get the domain A record, because the MX server could be same as the normal domain handler server. If only upper level domain has MX record then we append the A record of original hostname (if exists) as first element of record collection. If none of these tries are successful, we give back an empty collection.

Special Thanks to Tim Motika (tmotika at ionami dot com) for his reworking of this method.

Parameters:

hostName - We search the associated MX server of this hostname.

Returns:

Collection of URLName objects. If no MX server found, then it gives back an empty collection.