/*

    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.

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                patent rights that may be infringed by your derivative works or

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                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,

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                THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

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*/

#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