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SRVResolver.h

/*

    File:       SRVResolver.h

    Contains:   Uses <dns_sd.h> APIs to resolve SRV records.

    Written by: DTS

    Copyright:  Copyright (c) 2010-2012 Apple Inc. All Rights Reserved.

    Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple Inc.

                ("Apple") in consideration of your agreement to the following

                terms, and your use, installation, modification or

                redistribution of this Apple software constitutes acceptance of

                these terms.  If you do not agree with these terms, please do

                not use, install, modify or redistribute this Apple software.

                In consideration of your agreement to abide by the following

                terms, and subject to these terms, Apple grants you a personal,

                non-exclusive license, under Apple's copyrights in this

                original Apple software (the "Apple Software"), to use,

                reproduce, modify and redistribute the Apple Software, with or

                without modifications, in source and/or binary forms; provided

                that if you redistribute the Apple Software in its entirety and

                without modifications, you must retain this notice and the

                following text and disclaimers in all such redistributions of

                the Apple Software. Neither the name, trademarks, service marks

                or logos of Apple Inc. may be used to endorse or promote

                products derived from the Apple Software without specific prior

                written permission from Apple.  Except as expressly stated in

                this notice, no other rights or licenses, express or implied,

                are granted by Apple herein, including but not limited to any

                patent rights that may be infringed by your derivative works or

                by other works in which the Apple Software may be incorporated.

                The Apple Software is provided by Apple on an "AS IS" basis.

                APPLE MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

                WITHOUT LIMITATION THE IMPLIED WARRANTIES OF NON-INFRINGEMENT,

                MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, REGARDING

                THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

                COMBINATION WITH YOUR PRODUCTS.

                IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT,

                INCIDENTAL OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED

                TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

                DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ARISING IN ANY WAY

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                OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY

                OF CONTRACT, TORT (INCLUDING NEGLIGENCE), STRICT LIABILITY OR

                OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF

                SUCH DAMAGE.

*/

#import <Foundation/Foundation.h>

#include <dns_sd.h>

@protocol SRVResolverDelegate;

@interface SRVResolver : NSObject

- (id)initWithSRVName:(NSString *)srvName;

// properties set up by the init method

@property (nonatomic, copy,   readonly ) NSString *                 srvName;

// properties you can change any time

@property (nonatomic, weak,   readwrite) id<SRVResolverDelegate>    delegate;

// properties that change as the result of running the query

@property (nonatomic, assign, readonly, getter=isFinished) BOOL     finished;   // observable

@property (nonatomic, copy,   readonly ) NSError *                  error;      // observable

@property (nonatomic, copy,   readonly ) NSArray *                  results;    // of NSDictionary, observable

// Note that there is no default timeout here.  See "Read Me About SRVResolver"

// for a discussion as to why not.

- (void)start;

- (void)stop;

@end

// Keys for the dictionaries in the results array:

extern NSString * kSRVResolverPriority;     // NSNumber, host byte order

extern NSString * kSRVResolverWeight;       // NSNumber, host byte order

extern NSString * kSRVResolverPort;         // NSNumber, host byte order

extern NSString * kSRVResolverTarget;       // NSString

extern NSString * kSRVResolverErrorDomain;

@protocol SRVResolverDelegate <NSObject>

@optional

// These delegates methods are called from the default run loop mode on the run loop of the

// thread that called -start.

- (void)srvResolver:(SRVResolver *)resolver didReceiveResult:(NSDictionary *)result;

    // Called when we've successfully receive an answer.  The result parameter is a copy

    // of the dictionary that we just added to the results array.  This callback can be

    // called multiple times if there are multiple results.  You learn that the last

    // result was delivered by way of the -srvResolver:didStopWithError: callback.

- (void)srvResolver:(SRVResolver *)resolver didStopWithError:(NSError *)error;

    // Called when the query stops (except when you stop it yourself by calling -stop),

    // either because it's received all the results (error is nil) or there's been an

    // error (error is not nil).

@end

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