libs-gui/Tools/speech_recognizer/GSSpeechRecognitionServer.m

/* Implementation of class GSSpeechRecognitionServer
   Copyright (C) 2019 Free Software Foundation, Inc.
   
   By: Gregory John Casamento
   Date: Fri Dec  6 04:55:59 EST 2019

   This file is part of the GNUstep Library.
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.
   
   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
   
   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
   Boston, MA 02110 USA.
*/

#import "GSSpeechRecognitionServer.h"
#import "GSSpeechRecognitionEngine.h"
#import <Foundation/Foundation.h>

static GSSpeechRecognitionServer *_sharedInstance;
static int _clients = 0;

@implementation GSSpeechRecognitionServer

/**
 * Monitor connection...
 */
+ (void)connectionDied: (NSNotification*)aNotification
{
  NSArray *objs = [[aNotification object] localObjects];
  NSEnumerator *en = [objs objectEnumerator];
  id o = nil;

  if(_clients > 0)
    {
      _clients--;
    }
  
  if(_clients <= 0)
    {
      NSLog(@"Client count is zero, exiting");
      exit(0);
    }
  
  NSLog(@"NSSpeechRecognizer server connection count = %d after disconnection", _clients);
  while((o = [en nextObject]) != nil)
    {
      if ([o isKindOfClass: self])
        {
          RELEASE(o);
        }
    }
}

+ (void)initialize
{
  _sharedInstance = [[self alloc] init];
  _clients = 0;
  [[NSNotificationCenter defaultCenter]
		addObserver: self
		   selector: @selector(connectionDied:)
                       name: NSConnectionDidDieNotification
                     object: nil];
}

+ (void)start
{
  NSConnection *connection = [NSConnection defaultConnection];
  [connection setRootObject: _sharedInstance];
  RETAIN(connection);
  if (NO == [connection registerName: @"GSSpeechRecognitionServer"])
    {
      NSLog(@"Could not register name, make sure another server is not running.");
      return;
    }
  [[NSRunLoop currentRunLoop] run];
}

+ (id)sharedServer
{
  _clients++;
  NSLog(@"NSSpeechRecognizer server connection count = %d after connection", _clients);
  return _sharedInstance;
}

- (id)init
{
  if (nil == (self = [super init]))
    {
      return nil;
    }
  
  _engine = [GSSpeechRecognitionEngine defaultSpeechRecognitionEngine];

  if (nil == _engine)
    {
      [self release];
      return nil;
    }
  else
    {
      NSLog(@"Got engine %@", _engine);
    }
  
  return self;
}

- (void) startListening
{
  [_engine startListening];
}

- (void) stopListening
{
  [_engine stopListening];
}

@end