Data commit

Task/Distributed-programming/Objective-C/distributed-programming-1.m

@@ -0,0 +1,6 @@
+#import <Foundation/Foundation.h>
+// our protocol allows "sending" "strings", but we can implement
+// everything we could for a "local" object
+@protocol ActionObjectProtocol
+- (NSString *)sendMessage: (NSString *)msg;
+@end

Task/Distributed-programming/Objective-C/distributed-programming-2.m

@@ -0,0 +1,6 @@
+#import <Foundation/Foundation.h>
+#import "ActionObjectProtocol.h"
+
+@interface ActionObject : NSObject <ActionObjectProtocol>
+  // we do not have much for this example!
+@end

Task/Distributed-programming/Objective-C/distributed-programming-3.m

@@ -0,0 +1,10 @@
+#import <Foundation/Foundation.h>
+#import "ActionObject.h"
+
+@implementation ActionObject
+-(NSString *)sendMessage: (NSString *)msg
+{
+  NSLog(@"client sending message %@", msg);
+  return @"server answers ...";
+}
+@end

Task/Distributed-programming/Objective-C/distributed-programming-4.m

@@ -0,0 +1,35 @@
+#import <Foundation/Foundation.h>
+#import "ActionObject.h"
+
+int main (void)
+{
+  @autoreleasepool {
+
+    ActionObject *action = [[ActionObject alloc] init];
+
+    NSSocketPort *port = (NSSocketPort *)[NSSocketPort port];
+    // initWithTCPPort: 1234 and other methods are not supported yet
+    // by GNUstep
+    NSConnection *connect = [NSConnection
+  	      connectionWithReceivePort: port
+  	      sendPort: port]; // or sendPort: nil
+
+    [connect setRootObject: action];
+
+    /* "vend" the object ActionObject as DistributedAction; on GNUstep
+       the Name Server that allows the resolution of the registered name
+       is bound to port 538 */
+    if (![connect registerName:@"DistributedAction"
+  	       withNameServer: [NSSocketPortNameServer sharedInstance] ])
+    {
+      NSLog(@"can't register the server DistributedAction");
+      exit(EXIT_FAILURE);
+    }
+
+    NSLog(@"waiting for messages...");
+
+    [[NSRunLoop currentRunLoop] run];
+
+  }
+  return 0;
+}

Task/Distributed-programming/Objective-C/distributed-programming-5.m

@@ -0,0 +1,38 @@
+#import <Foundation/Foundation.h>
+#import "ActionObjectProtocol.h"
+
+int main(void)
+{
+  @autoreleasepool {
+
+    id <ActionObjectProtocol> action = (id <ActionObjectProtocol>)
+      [NSConnection
+        rootProxyForConnectionWithRegisteredName: @"DistributedAction"
+        host: @"localhost"
+        usingNameServer: [NSSocketPortNameServer sharedInstance] ];
+
+    if (action == nil)
+    {
+      NSLog(@"can't connect to the server");
+      exit(EXIT_FAILURE);
+    }
+
+    NSArray *args = [[NSProcessInfo processInfo] arguments];
+
+    if ([args count] == 1)
+    {
+      NSLog(@"specify a message");
+      exit(EXIT_FAILURE);
+    }
+
+    NSString *msg = args[1];
+
+    // "send" (call the selector "sendMessage:" of the (remote) object
+    // action) the first argument's text as msg, store the message "sent
+    // back" and then show it in the log
+    NSString *backmsg = [action sendMessage: msg];
+    NSLog("%@", backmsg);
+
+  }
+  return 0;
+}