jorbsd/MikeAsh.mdown

## MikeAsh.mdown

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

JBBTypes.h
JBB_C_Functions.h
JBB_C_Functions.m
Classes/JBBObjectProxy.h
Classes/JBBObjectProxy.m
Classes/Extensions/NSInvocation+JBBContinuations.h
Classes/Extensions/NSInvocation+JBBContinuations.m
Classes/Extensions/NSObject+JBBContinuations.h
Classes/Extensions/NSObject+JBBContinuations.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/JBBContinuations/Release -F/Users/jordan/Build/JBBContinuations/Release -o test_1 test_1.m -framework JBBContinuations -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBContinuations/JBBContinuations.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];
   NSLog(@"%@", aString);

   anotherString = [NSString stringWithCString:"this is another test" encoding:NSUTF8StringEncoding];
   NSLog(@"%@", anotherString);

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

   [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/JBBContinuations/Release -F/Users/jordan/Build/JBBContinuations/Release -o test_2 test_2.m -framework JBBContinuations -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBContinuations/JBBContinuations.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) {
       NSLog(@"%@", anObject);
   }];

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

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

   [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/JBBContinuations/Release -F/Users/jordan/Build/JBBContinuations/Release -o test_3 test_3.m -framework JBBContinuations -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBContinuations/JBBContinuations.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) {
       NSLog(@"%@", anObject);
   }];

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

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

   [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/JBBContinuations/Release -F/Users/jordan/Build/JBBContinuations/Release -o test_4 test_4.m -framework JBBContinuations -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBContinuations/JBBContinuations.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   [[NSString jbb_proxyWithContinuation:^(id anObject) {
       NSLog(@"%@", anObject);
   }] 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];
   NSLog(@"%@", [anOutsideObject autorelease]);

   [[NSString jbb_proxyWithContinuation:^(id anObject) {
       NSLog(@"no error occurred");
   } errorHandler:^(NSError *anError) {
       if (anError) {
           NSLog(@"an error occurred: %@", anError);
       } else {
           NSLog(@"an error occurred");
       }
   }] 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/JBBContinuations/Release -F/Users/jordan/Build/JBBContinuations/Release -o test_5 test_5.m -framework JBBContinuations -framework Cocoa
#import <Cocoa/Cocoa.h>
#import <JBBContinuations/JBBContinuations.h>
int main(int argc, char *argv[]) {
NSAutoreleasePool *localPool = [[NSAutoreleasePool alloc] init];
   id baseProxy = [NSString jbb_proxyWithContinuation:^(id anObject) {
       NSLog(@"base continuations");
   } errorHandler:^(NSError *anError) {
       NSLog(@"base errorHandler");
   }];

   [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) {
       NSLog(@"%@", anObject);
   }];

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

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

   [localPool drain];
   return 0;

}