langs a-z

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 +1,40 @@
+#import <Foundation/Foundation.h>
+#import "ActionObject.h"
+
+int main (void)
+{
+  NSAutoreleasePool *pool;
+  ActionObject *action;
+  NSConnection *connect;
+  NSSocketPort *port;
+
+  pool = [[NSAutoreleasePool alloc] init];
+
+  action = [[ActionObject alloc] init];
+
+  port = (NSSocketPort *)[NSSocketPort port];
+  // initWithTCPPort: 1234 and other methods are not supported yet
+  // by GNUstep
+  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] ] == NO)
+  {
+    NSLog(@"can't register the server DistributedAction");
+    exit(EXIT_FAILURE);
+  }
+
+  NSLog(@"waiting for messages...");
+
+  [[NSRunLoop currentRunLoop] run];
+
+  [pool release];
+  return 0;
+}

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

@@ -0,0 +1,43 @@
+#import <Foundation/Foundation.h>
+#import "ActionObjectProtocol.h"
+
+int main(void)
+{
+  NSAutoreleasePool *pool;
+  NSArray *args;
+  id <ActionObjectProtocol> action;
+  NSString *msg, *backmsg;
+
+  pool = [[NSAutoreleasePool alloc] init];
+
+  action = (id <ActionObjectProtocol>)
+    [NSConnection
+      rootProxyForConnectionWithRegisteredName: @"DistributedAction"
+      host: @"localhost"
+      usingNameServer: [NSSocketPortNameServer sharedInstance] ];
+
+  if (action == nil)
+  {
+    NSLog(@"can't connect to the server");
+    exit(EXIT_FAILURE);
+  }
+
+  args = [[NSProcessInfo processInfo] arguments];
+
+  if ([args count] == 1)
+  {
+    NSLog(@"specify a message");
+    exit(EXIT_FAILURE);
+  }
+
+  msg = [args objectAtIndex: 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
+  backmsg = [action sendMessage: msg];
+  NSLog("%@", backmsg);
+
+  [pool release];
+  return 0;
+}