pburleson/MikeAsh.mdown

## MikeAsh.mdown

      
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              MikeAsh.mdown
            
          
    Samples of new usage for continuations in JBBAdditions.
The relevant source files are:

JBBTypes.h
JBB_C_Functions.h
JBB_C_Functions.m
Classes/JBBObjectProxy.h
Classes/JBBObjectProxy.h
Classes/Extensions/NSInvocation+JBBAdditions.h
Classes/Extensions/NSInvocation+JBBAdditions.m
Classes/Extensions/NSObject+JBBAdditions.h
Classes/Extensions/NSObject+JBBAdditions.m

The new code samples are:


Create an empty proxy, message it directly, it should pass things through (returns value)
//clang -arch i386 -arch x86_64 -Wl,-rpath,/Users/jordan/Build/JBBAdditions/Release -F/Users/jordan/Build/JBBAdditions/Release -o test_1 test_1.m -framework JBBAdditions -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBAdditions/JBBAdditions.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   NSError *anError = nil;
   NSString *aString = nil;
   NSString *anotherString = nil;

   aString = [NSString stringWithCString:"this is a test" encoding:NSUTF8StringEncoding];
   [aString jbb_puts];

   anotherString = [NSString stringWithCString:"this is another test" encoding:NSUTF8StringEncoding];
   [anotherString jbb_puts];

   if (![NSString stringWithContentsOfFile:@"/tmp/completely_fake_file.txt" encoding:NSUTF8StringEncoding error:&anError]) {
       if (anError) {
           [[NSString stringWithFormat:@"an error occured: %@", anError] jbb_puts];
       } else {
           [@"an error occurred" jbb_puts];
       }
   } else {
       [@"no error occurred" jbb_puts];
   }

   [localPool drain];
   return 0;

}


Create an empty proxy, message it directly, use +getStoredInvocation and then invoke it, there is a WRAP_MSG_SEND() macro to help
// clang -arch i386 -arch x86_64 -Wl,-rpath,/Users/jordan/Build/JBBAdditions/Release -F/Users/jordan/Build/JBBAdditions/Release -o test_2 test_2.m -framework JBBAdditions -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBAdditions/JBBAdditions.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   [WRAP_MSG_SEND(NSString, stringWithCString:"this is a test" encoding:NSUTF8StringEncoding) jbb_invokeWithContinuation:^(id anObject) {
       [anObject jbb_puts];
   }];

   __block NSString *anOutsideObject = nil;
   [WRAP_MSG_SEND(NSString, stringWithCString:"this is another test" encoding:NSUTF8StringEncoding) jbb_invokeWithContinuation:^(id anObject) {
       anOutsideObject = [anObject retain];
   }];
   [[anOutsideObject autorelease] jbb_puts];

   [WRAP_MSG_SEND(NSString, stringWithContentsOfFile:@"/tmp/completely_fake_file.txt" encoding:NSUTF8StringEncoding error:nil) jbb_invokeWithContinuation:^(id anObject) {
       [@"no error occurred" jbb_puts];
   } errorHandler:^(NSError *anError) {
       if (anError) {
           [[NSString stringWithFormat:@"an error occured: %@", anError] jbb_puts];
       } else {
           [@"an error occurred" jbb_puts];
       }
   }];

   [localPool drain];
   return 0;

}


Create an empty proxy, message it with continuations and error handlers attached (returns object)
// clang -arch i386 -arch x86_64 -Wl,-rpath,/Users/jordan/Build/JBBAdditions/Release -F/Users/jordan/Build/JBBAdditions/Release -o test_3 test_3.m -framework JBBAdditions -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBAdditions/JBBAdditions.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   [[NSString jbb_proxy] stringWithCString:"this is a test" encoding:NSUTF8StringEncoding continuation:^(id anObject) {
       [anObject jbb_puts];
   }];

   __block NSString *anOutsideObject = nil;
   [[NSString jbb_proxy] stringWithCString:"this is another test" encoding:NSUTF8StringEncoding continuation:^(id anObject) {
       anOutsideObject = [anObject retain];
   }];
   [[anOutsideObject autorelease] jbb_puts];

   [[NSString jbb_proxy] stringWithContentsOfFile:@"/tmp/completely_fake_file.txt" encoding:NSUTF8StringEncoding error:nil continuation:^(id anObject) {
       [@"no error occurred" jbb_puts];
   } errorHandler:^(NSError *anError) {
       if (anError) {
           [[NSString stringWithFormat:@"an error occured: %@", anError] jbb_puts];
       } else {
           [@"an error occurred" jbb_puts];
       }
   }];

   [localPool drain];
   return 0;

}


Create a proxy with an associated continuation and error handler, message it directly (returns value)
// clang -arch i386 -arch x86_64 -Wl,-rpath,/Users/jordan/Build/JBBAdditions/Release -F/Users/jordan/Build/JBBAdditions/Release -o test_4 test_4.m -framework JBBAdditions -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBAdditions/JBBAdditions.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   [[NSString jbb_proxyWithContinuation:^(id anObject) {
       [anObject jbb_puts];
   }] stringWithCString:"this is a test" encoding:NSUTF8StringEncoding];

   __block NSString *anOutsideObject = nil;
   [[NSString jbb_proxyWithContinuation:^(id anObject) {
       anOutsideObject = [anObject retain];
   }] stringWithCString:"this is another test" encoding:NSUTF8StringEncoding];
   [[anOutsideObject autorelease] jbb_puts];

   [[NSString jbb_proxyWithContinuation:^(id anObject) {
       [@"no error occurred" jbb_puts];
   } errorHandler:^(NSError *anError) {
       if (anError) {
           [[NSString stringWithFormat:@"an error occured: %@", anError] jbb_puts];
       } else {
           [@"an error occurred" jbb_puts];
       }
   }] stringWithContentsOfFile:@"/tmp/completely_fake_file.txt" encoding:NSUTF8StringEncoding error:nil];

   [localPool drain];
   return 0;

}


Create a proxy with an associated continuation and error handler, message it with continuations and error handlers attached (returns object)
// clang -arch i386 -arch x86_64 -Wl,-rpath,/Users/jordan/Build/JBBAdditions/Release -F/Users/jordan/Build/JBBAdditions/Release -o test_5 test_5.m -framework JBBAdditions -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBAdditions/JBBAdditions.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   id baseProxy = [NSString jbb_proxyWithContinuation:^(id anObject) {
       [@"base continuation" jbb_puts];
   } errorHandler:^(NSError *anError) {
       [@"base errorHandler" jbb_puts];
   }];

   [baseProxy stringWithCString:"this is a test" encoding:NSUTF8StringEncoding];

   [baseProxy stringWithContentsOfFile:@"/tmp/completely_fake_file.txt" encoding:NSUTF8StringEncoding error:nil];

   [baseProxy stringWithCString:"this is a test" encoding:NSUTF8StringEncoding continuation:^(id anObject) {
       [anObject jbb_puts];
   }];

   __block NSString *anOutsideObject = nil;
   [baseProxy stringWithCString:"this is another test" encoding:NSUTF8StringEncoding continuation:^(id anObject) {
       anOutsideObject = [anObject retain];
   }];
   [[anOutsideObject autorelease] jbb_puts];

   [baseProxy stringWithContentsOfFile:@"/tmp/completely_fake_file.txt" encoding:NSUTF8StringEncoding error:nil continuation:^(id anObject) {
       [@"no error occurred" jbb_puts];
   } errorHandler:^(NSError *anError) {
       if (anError) {
           [[NSString stringWithFormat:@"an error occured: %@", anError] jbb_puts];
       } else {
           [@"an error occurred" jbb_puts];
       }
   }];

   [localPool drain];
   return 0;

}