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Deferred.m
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Deferred.m
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//
// Deferred.m
// ObjC-Deferred
//
// Created by Aaron Zinman on 1/12/12.
// Copyright (c) 2012 Empirical Design LLC. All rights reserved.
//
#import "Deferred.h"
@implementation Deferred
@synthesize state = _state;
@synthesize failList = _failList;
@synthesize doneList = _doneList;
@synthesize alwaysList = _alwaysList;
@synthesize obj = _obj;
+ (Deferred *) deferred {
return [[Deferred alloc] init];
}
- (id) init {
if (self = [super init]) {
self.state = PENDING;
}
return self;
}
- (Deferred *) done:(IdBlock)callback {
@synchronized(self) {
if (self.state == PENDING) {
if (self.doneList == nil) {
self.doneList = [NSMutableSet set];
}
[self.doneList addObject:[callback copy]];
} else if (self.state == RESOLVED) {
callback(self.obj);
} else {
// Do nothing; we have already been rejected
}
}
return self;
}
- (Deferred *) fail:(IdBlock)callback {
@synchronized(self) {
if (self.state == PENDING) {
if (self.failList == nil) {
self.failList = [NSMutableSet set];
}
[self.failList addObject:[callback copy]];
} else if (self.state == REJECTED) {
callback(self.obj);
} else {
// Do nothing; we have already been resolved
}
}
return self;
}
- (Deferred *) always:(IdBlock)callback {
@synchronized(self) {
if (self.state == PENDING) {
if (self.alwaysList == nil) {
self.alwaysList = [NSMutableSet set];
}
[self.alwaysList addObject:[callback copy]];
} else {
callback(self.obj);
}
}
return self;
}
- (void) resolve:(id)obj {
@synchronized(self) {
if (self.state != PENDING) {
[NSException raise:(self.state == RESOLVED ? @"Deferred already resolved" : @"Deferred already rejected")
format:@"Ignoring resolve with obj: %@", obj];
return;
}
self.obj = obj;
self.state = RESOLVED;
if (self.doneList) {
for (IdBlock callback in self.doneList) {
callback(obj);
}
}
if (self.alwaysList) {
for (IdBlock callback in self.alwaysList) {
callback(obj);
}
}
}
}
- (void) reject:(id)obj {
@synchronized(self) {
if (self.state != PENDING) {
[NSException raise:(self.state == RESOLVED ? @"Deferred already resolved" : @"Deferred already rejected")
format:@"Ignoring resolve with obj: %@", obj];
return;
}
self.obj = obj;
self.state = REJECTED;
if (self.failList) {
for (IdBlock callback in self.failList) {
callback(obj);
}
}
if (self.alwaysList) {
for (IdBlock callback in self.alwaysList) {
callback(obj);
}
}
}
}
+ (Deferred *) testDeferred {
return [[[[Deferred deferred] done:^(id obj) {
NSLog(@"done with obj: %@", obj);
}] fail:^(id obj) {
NSLog(@"fail with obj: %@", obj);
}] always:^(id obj) {
NSLog(@"always with obj: %@", obj);
}];
}
+ (void) stupidTest {
NSLog(@"-------- Doing resolved test");
Deferred *d = [Deferred testDeferred];
[d resolve:@"RESOLVED OBJ"];
[d done:^(id obj) {
NSLog(@"another done callback: %@", obj);
}];
[d fail:^(id obj) {
NSLog(@"this shouldn't be seen fail callback: %@", obj);
}];
[d always:^(id obj) {
NSLog(@"Another always callback: %@", obj);
}];
NSLog(@"-------- Doing rejected test");
d = [Deferred testDeferred];
[d reject:@"RJECTED OBJ"];
[d done:^(id obj) {
NSLog(@"This shouldnt be seen: %@", obj);
}];
[d fail:^(id obj) {
NSLog(@"another fail callback: %@", obj);
}];
[d always:^(id obj) {
NSLog(@"Another always callback: %@", obj);
}];
NSLog(@"-------- Doing nil test");
d = [Deferred testDeferred];
[d resolve:nil];
NSLog(@"-------- Doing explody test");
d = [Deferred testDeferred];
[d reject:@"RJECTED OBJ"];
[d resolve:@"EXPLODY OBJ"];
}
@end