org.xbill.DNS
Interface Resolver

All Known Implementing Classes:

ExtendedResolver, SimpleResolver

public interface Resolver

Interface describing a resolver.

Author:

Brian Wellington

Method Summary

Message	send(Message query) Sends a message and waits for a response.
Object	sendAsync(Message query, ResolverListener listener) Asynchronously sends a message registering a listener to receive a callback on success or exception.
void	setEDNS(int level) Sets the EDNS version used on outgoing messages.
void	setEDNS(int level, int payloadSize, int flags, List options) Sets the EDNS information on outgoing messages.
void	setIgnoreTruncation(boolean flag) Sets whether truncated responses will be ignored.
void	setPort(int port) Sets the port to communicate with on the server
void	setTCP(boolean flag) Sets whether TCP connections will be sent by default
void	setTimeout(int secs) Sets the amount of time to wait for a response before giving up.
void	setTimeout(int secs, int msecs) Sets the amount of time to wait for a response before giving up.
void	setTSIGKey(TSIG key) Specifies the TSIG key that messages will be signed with

Method Detail

setPort

void setPort(int port)

Sets the port to communicate with on the server

Parameters:

port - The port to send messages to

setTCP

void setTCP(boolean flag)

Sets whether TCP connections will be sent by default

Parameters:

flag - Indicates whether TCP connections are made

setIgnoreTruncation

void setIgnoreTruncation(boolean flag)

Sets whether truncated responses will be ignored. If not, a truncated response over UDP will cause a retransmission over TCP.

Parameters:

flag - Indicates whether truncated responses should be ignored.

setEDNS

void setEDNS(int level)

Sets the EDNS version used on outgoing messages.

Parameters:

level - The EDNS level to use. 0 indicates EDNS0 and -1 indicates no EDNS.

Throws:

IllegalArgumentException - An invalid level was indicated.

setEDNS

void setEDNS(int level,
             int payloadSize,
             int flags,
             List options)

Sets the EDNS information on outgoing messages.

Parameters:

level - The EDNS level to use. 0 indicates EDNS0 and -1 indicates no EDNS.

payloadSize - The maximum DNS packet size that this host is capable of receiving over UDP. If 0 is specified, the default (1280) is used.

flags - EDNS extended flags to be set in the OPT record.

options - EDNS options to be set in the OPT record, specified as a List of OPTRecord.Option elements.

Throws:

IllegalArgumentException - An invalid field was specified.

See Also:

OPTRecord

setTSIGKey

void setTSIGKey(TSIG key)

Specifies the TSIG key that messages will be signed with

Parameters:

key - The key

setTimeout

void setTimeout(int secs,
                int msecs)

Sets the amount of time to wait for a response before giving up.

Parameters:

secs - The number of seconds to wait.

msecs - The number of milliseconds to wait.

setTimeout

void setTimeout(int secs)

Sets the amount of time to wait for a response before giving up.

Parameters:

secs - The number of seconds to wait.

send

Message send(Message query)
             throws IOException

Sends a message and waits for a response.

Parameters:

query - The query to send.

Returns:

The response

Throws:

IOException - An error occurred while sending or receiving.

sendAsync

Object sendAsync(Message query,
                 ResolverListener listener)

Asynchronously sends a message registering a listener to receive a callback on success or exception. Multiple asynchronous lookups can be performed in parallel. Since the callback may be invoked before the function returns, external synchronization is necessary.

Parameters:

query - The query to send

listener - The object containing the callbacks.

Returns:

An identifier, which is also a parameter in the callback