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<p><strong><a href="TrivialThreads.zip">Download Sample</a></strong> (“TrivialThreads.zip”, 55.3K)<BR>
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<pre class="sourcecodebox">/* File: Controller.m Contains: Central control object for sample. Written by: Quinn "The Eskimo!" Created: Tue 10-Jun-1997 Copyright: (c)1997 by Apple Computer, Inc., all rights reserved. Change History (most recent first): You may incorporate this sample code into your applications without restriction, though the sample code has been provided "AS IS" and the responsibility for its operation is 100% yours. However, what you are not permitted to do is to redistribute the source as "DSC Sample Code" after having made changes. If you're going to re-distribute the source, we require that you make it clear in the source that the code was descended from Apple Sample Code, but that you've made changes.*/#import "Controller.h"#import "TransferServer.h"// IMPORTANT: See the documentation ("ReadMe.rtf" under Supporting Files) for// big picture information about this project.@implementation Controller- (id)init // See comments in interface part.{ NSPort *port1; NSPort *port2; NSArray *portArray; self = [super init]; if (self != nil) { // First create two new ports and a new NSConnection for sending // and receiving Distributed Object messages through those ports. We do // this (rather than use attempting to reuse the default NSConnection // that all applications have) because we want the ports to remain // anonymous. These ports are for talking between our application's // threads only; we don't want them published by name on the network. port1 = [NSPort port]; port2 = [NSPort port]; connectionToTransferServer = [[NSConnection alloc] initWithReceivePort:port1 sendPort:port2]; // Now set this object as the root object for the connection that we're about // to connect to the server. We do this so that the server can call us // back to a) give us a reference to the transferServer object by calling // our setServer method, and b) get more information from us by calling // our methods (which it can do, but doesn't in this sample). [connectionToTransferServer setRootObject:self]; // Initialise the transfer server to nil. Note that there's a concurrency // hole in this implementation. transferServer is nil when we leave this method, // and stays nil until TransferServer's connectWithPorts: runs in its thread // and sends us a setServer: message to set it. But we leave this routine without // waiting for that return message. If the new thread is unexpectedly // slowed down, it might be possible for someone to call our action methods // (eg doSomethingSlow:) before transferServer has been set up. Of course, // this is *extremely* unlikely (because our action methods are only invoked // as a result of user action) but it's worth noting. transferServer = nil; // Now put the two ports in an array and start a new thread, executing // TransferServer's connectWithPorts: method, with that array as its // argument. Notice how the ports are reversed here, so TransferServer's // connectWithPorts connects its send port to our receive port and vice versa. // // The target and data parameters are retained before the new thread is // detached, so there is no race condition between the new thread and the // auto release pool for the current event. (TIMC 3/17/98) portArray = [NSArray arrayWithObjects:port2, port1, nil]; [NSThread detachNewThreadSelector:@selector(connectWithPorts:) toTarget:[TransferServer class] withObject:portArray]; } return (self);}- (void)awakeFromNib{ [mainWindow makeKeyAndOrderFront:self];}- (void)setServer:(id)serverObject // See comments in interface part.{ // The following line is an interesting optimisation. We tell our proxy // to the transferServer object to about the methods that we're going to // send to the proxy. This optimises Distributed Object's delivery of // messages. [Normally when DO encounters a new method, it must first // conduct a transaction with the remote end to find the types for the // arguments of that message. It then bundles up the method and its // parameters and sends it. It also caches the response so that following // invokations of that method only take one transaction. By setting // a protocol for the proxy, you let DO know about the messages in // advance, and avoid it ever having to do two transactions.] [serverObject setProtocolForProxy:@protocol(TransferServerInterface)]; // We now retain the server object. TransferServer's connectWithPorts: // method is about to release it, so we must make sure that someone // has a reference! This also means that we're the *only* person with // a reference. [serverObject retain]; // Now record the remote server object (actually its proxy) in our instance // variable. Note that "(id <TransferServerInterface>)" is a form // of type casting. It says that serverObject conforms to the // TransferServerInterface protocol. transferServer = (id <TransferServerInterface>)serverObject; return;}- (oneway void)outputString:(NSString *)theString // See comments in interface part. Note that textField is // an instance variable declared in our header file that was wired // to the real text field in the window via Interface Builder.{ [textField replaceCharactersInRange:NSMakeRange( [ [textField string] length ], 0) withString:theString];}- (void)doSomethingSlow:(id)sender // See comments in interface part.{ [self outputString:@"doSomethingSlow:\n"]; [transferServer slowTransfer:self];}- (void)doSomethingSlower:(id)sender // See comment in interface part.{ [self outputString:@"doSomethingSlower:\n"]; [transferServer slowerTransfer:self];}- (void)showAboutPanel: (id) sender{// Method to load the .nib file for the info panel. if (!infoPanel) { if (![NSBundle loadNibNamed:@"InfoPanel" owner:self]) { NSLog(@"Failed to load InfoPanel.nib"); NSBeep(); return; } [infoPanel center]; } [infoPanel makeKeyAndOrderFront:nil];}@end</pre>
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