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Chapter6: update code for requesting friends facebook profile picture…
…s. add facebook requests to a queue
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| // | ||
| // FacebookRequestController.h | ||
| // ApiFacebook | ||
| // | ||
| // Created by Christopher White on 5/12/11. | ||
| // Copyright 2011 __MyCompanyName__. All rights reserved. | ||
| // | ||
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| #import <Foundation/Foundation.h> | ||
| #import "Facebook.h" | ||
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| @interface FacebookRequestController : NSObject <FBRequestDelegate> { | ||
| NSDictionary *currentRequestDictionary; | ||
| NSMutableArray *requestQueue; | ||
| BOOL handlingRequest; | ||
| } | ||
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| @property(nonatomic, retain) NSDictionary *currentRequestDictionary; | ||
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| + (FacebookRequestController*)sharedRequestController; | ||
| - (void)enqueueRequestWithGraphPath:(NSString*)path; | ||
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| @end |
147 changes: 147 additions & 0 deletions
147
Chapter6/ApiFacebook/Classes/FacebookRequestController.m
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| // | ||
| // FacebookRequestController.m | ||
| // ApiFacebook | ||
| // | ||
| // Created by Christopher White on 5/12/11. | ||
| // Copyright 2011 __MyCompanyName__. All rights reserved. | ||
| // | ||
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| #import "FacebookRequestController.h" | ||
| #import "NSMutableArray+QueueAdditions.h" | ||
| #import "AppDelegate.h" | ||
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| static FacebookRequestController *sharedRequestController; | ||
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| @implementation FacebookRequestController | ||
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| @synthesize currentRequestDictionary; | ||
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| + (FacebookRequestController*)sharedRequestController | ||
| { | ||
| if (nil == sharedRequestController) { | ||
| sharedRequestController = [[FacebookRequestController alloc] init]; | ||
| } | ||
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| return sharedRequestController; | ||
| } | ||
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| - (void)dealloc | ||
| { | ||
| [currentRequestDictionary release]; | ||
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| [requestQueue release]; | ||
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| [super dealloc]; | ||
| } | ||
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| //do one request at a time...monitor the queue on a separate thread... | ||
| //check the queue on a separate thread and if the queue is not empty, then take the next one off of the queue and issue a request for it on the main thread | ||
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| - (void)issueRequest:(NSString*)path | ||
| { | ||
| [facebook requestWithGraphPath:path andDelegate:self]; | ||
| } | ||
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| - (void)dequeueNextRequest | ||
| { | ||
| //only want to dequeue the next request if we're not currently processing a request | ||
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| NSString *currentPath = nil; | ||
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| if (NO == handlingRequest) { | ||
| @synchronized(self) { | ||
| if (0 < [requestQueue count]) { | ||
| currentPath = [requestQueue dequeue]; | ||
| } | ||
| } | ||
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| if (currentPath) { | ||
| handlingRequest = YES; | ||
| NSMutableDictionary *dictionary = [NSMutableDictionary dictionary]; | ||
| [dictionary setObject:currentPath forKey:@"path"]; | ||
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| self.currentRequestDictionary = dictionary; | ||
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| [self performSelectorOnMainThread:@selector(issueRequest:) withObject:currentPath waitUntilDone:NO]; | ||
| } | ||
| } | ||
| } | ||
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| - (void)processQueue:(id)object | ||
| { | ||
| while (TRUE) { | ||
| [[FacebookRequestController sharedRequestController] dequeueNextRequest]; | ||
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| [NSThread sleepForTimeInterval:.01]; | ||
| } | ||
| } | ||
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| - (void)enqueueRequestWithGraphPath:(NSString*)path | ||
| { | ||
| if (nil == requestQueue) { | ||
| requestQueue = [[NSMutableArray array] retain]; | ||
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| [self performSelectorInBackground:@selector(processQueue:) withObject:nil]; | ||
| } | ||
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| @synchronized(self) { | ||
| [requestQueue enqueue:path]; | ||
| } | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark FBRequestDelegate | ||
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| - (void)requestLoading:(FBRequest *)request { | ||
| NSLog(@"requestLoading:"); | ||
| } | ||
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| /** | ||
| * Called when the server responds and begins to send back data. | ||
| */ | ||
| - (void)request:(FBRequest *)request didReceiveResponse:(NSURLResponse *)response { | ||
| NSLog(@"didReceiveResponse:"); | ||
| } | ||
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| /** | ||
| * Called when an error prevents the request from completing successfully. | ||
| */ | ||
| - (void)request:(FBRequest *)request didFailWithError:(NSError *)error { | ||
| NSLog(@"didFailWithError:"); | ||
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| handlingRequest = NO; | ||
| } | ||
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| /** | ||
| * Called when a request returns and its response has been parsed into an object. | ||
| * | ||
| * The resulting object may be a dictionary, an array, a string, or a number, depending | ||
| * on thee format of the API response. | ||
| */ | ||
| - (void)request:(FBRequest *)request didLoad:(id)result { | ||
| NSLog(@"didLoad:"); | ||
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| //post a notification with the current dictionary | ||
| //issue notification to whoever registered for the given path and include the result response | ||
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| handlingRequest = NO; | ||
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| NSDictionary *userInfoDictionary = [NSDictionary dictionaryWithObjects:[NSArray arrayWithObjects:result, nil] forKeys:[NSArray arrayWithObjects:@"result", nil]]; | ||
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| NSString *path = [self.currentRequestDictionary objectForKey:@"path"]; | ||
| [[NSNotificationCenter defaultCenter] postNotificationName:path | ||
| object:self | ||
| userInfo:userInfoDictionary]; | ||
| } | ||
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| /** | ||
| * Called when a request returns a response. | ||
| * | ||
| * The result object is the raw response from the server of type NSData | ||
| */ | ||
| - (void)request:(FBRequest *)request didLoadRawResponse:(NSData *)data { | ||
| NSLog(@"didLoadRawResponse:"); | ||
| } | ||
|
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|
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| @end |
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16 changes: 16 additions & 0 deletions
16
Chapter6/ApiFacebook/Classes/NSMutableArray+QueueAdditions.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| // | ||
| // NSMutableArray+QueueAdditions.h | ||
| // ApiFacebook | ||
| // | ||
| // Created by Christopher White on 5/12/11. | ||
| // Copyright 2011 __MyCompanyName__. All rights reserved. | ||
| // | ||
|
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| #import <Foundation/Foundation.h> | ||
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| @interface NSMutableArray (QueueAdditions) | ||
| - (id) dequeue; | ||
| - (void) enqueue:(id)obj; | ||
| @end | ||
|
|
32 changes: 32 additions & 0 deletions
32
Chapter6/ApiFacebook/Classes/NSMutableArray+QueueAdditions.m
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,32 @@ | ||
| // | ||
| // NSMutableArray+QueueAdditions.m | ||
| // ApiFacebook | ||
| // | ||
| // Created by Christopher White on 5/12/11. | ||
| // Copyright 2011 __MyCompanyName__. All rights reserved. | ||
| // | ||
|
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| #import "NSMutableArray+QueueAdditions.h" | ||
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| @implementation NSMutableArray (QueueAdditions) | ||
|
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| - (id)dequeue | ||
| { | ||
| if ([self count] == 0) { | ||
| return nil; | ||
| } | ||
| id queueObject = [[[self objectAtIndex:0] retain] autorelease]; | ||
| [self removeObjectAtIndex:0]; | ||
| return queueObject; | ||
| } | ||
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| // Add to the tail of the queue (no one likes it when people cut in line!) | ||
| - (void) enqueue:(id)anObject | ||
| { | ||
| [self addObject:anObject]; | ||
| //this method automatically adds to the end of the array | ||
| } | ||
| @end | ||
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