summaryrefslogtreecommitdiffstats
path: root/src/k3bmediacache.cpp
blob: 52195d07fcbd727cee3a59f6a38e7baa92ea744b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
/* 
 *
 * $Id: sourceheader 380067 2005-01-19 13:03:46Z trueg $
 * Copyright (C) 2005 Sebastian Trueg <trueg@k3b.org>
 *
 * This file is part of the K3b project.
 * Copyright (C) 1998-2007 Sebastian Trueg <trueg@k3b.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * See the file "COPYING" for the exact licensing terms.
 */

#include "k3bmediacache.h"
#include "k3bmedium.h"

#include <k3bdevicemanager.h>
#include <k3bdeviceglobals.h>
#include <k3bscsicommand.h>
#include <k3bcore.h>

#include <kdebug.h>
#include <kapplication.h>
#include <klocale.h>

#include <tqthread.h>
#include <tqmutex.h>
#include <tqevent.h>


// ////////////////////////////////////////////////////////////////////////////////
// MEDIA CACHE SUPPORT CLASSES
// ////////////////////////////////////////////////////////////////////////////////

class K3bMediaCache::MediaChangeEvent : public TQCustomEvent
{
public:
  static const int EventCode;

  MediaChangeEvent( K3bDevice::Device* dev )
    : TQCustomEvent( EventCode ),
      m_device( dev ) {}

  K3bDevice::Device* device() const { return m_device; }

private:
  K3bDevice::Device* m_device;
};

const int K3bMediaCache::MediaChangeEvent::EventCode = TQEvent::User + 22;


class K3bMediaCache::DeviceEntry
{
public:
  DeviceEntry( K3bMediaCache* cache, K3bDevice::Device* dev );
  ~DeviceEntry();

  K3bMedium medium;

  int blockedId;
  
  TQMutex mutex;

  K3bMediaCache::PollThread* thread;

  K3bMediaCache* cache;
  
  void clear() {
    medium.reset();
  }
};


class K3bMediaCache::PollThread : public TQThread
{
public:
  PollThread( K3bMediaCache::DeviceEntry* de )
    : m_deviceEntry( de ) {}

protected:
  void run();

private:
  K3bMediaCache::DeviceEntry* m_deviceEntry;
};




// ////////////////////////////////////////////////////////////////////////////////
// MEDIA CACHE SUPPORT CLASSES IMPL
// ////////////////////////////////////////////////////////////////////////////////


K3bMediaCache::DeviceEntry::DeviceEntry( K3bMediaCache* c, K3bDevice::Device* dev )
  : medium(dev),
    blockedId(0),
    cache(c)
{
  thread = new K3bMediaCache::PollThread( this );
}


K3bMediaCache::DeviceEntry::~DeviceEntry()
{
  delete thread;
}


void K3bMediaCache::PollThread::run()
{
  while( m_deviceEntry->blockedId == 0 ) {
    bool unitReady = m_deviceEntry->medium.device()->testUnitReady();
    bool mediumCached = ( m_deviceEntry->medium.diskInfo().diskState() != K3bDevice::STATE_NO_MEDIA );
    
    //
    // we only get the other information in case the disk state changed or if we have
    // no info at all (FIXME: there are drives around that are not able to provide a proper
    // disk state)
    //
    if( m_deviceEntry->medium.diskInfo().diskState() == K3bDevice::STATE_UNKNOWN || 
	unitReady != mediumCached ) {
      
      //
      // The medium has changed. We need to update the information.
      //
      K3bMedium m( m_deviceEntry->medium.device() );
      m.update();
      
      // block the info since it is not valid anymore
      m_deviceEntry->mutex.lock();
      
      //      m_deviceEntry->medium.update();
      m_deviceEntry->medium = m;
      	
      //
      // inform the media cache about the media change
      //
      if( m_deviceEntry->blockedId == 0 )
	TQApplication::postEvent( m_deviceEntry->cache,
				 new K3bMediaCache::MediaChangeEvent( m_deviceEntry->medium.device() ) );
      
      // the information is valid. let the info go.
      m_deviceEntry->mutex.unlock();
    }
      
    if( m_deviceEntry->blockedId == 0 )
      TQThread::sleep( 2 );
  }
}





// ////////////////////////////////////////////////////////////////////////////////
// MEDIA CACHE IMPL
// ////////////////////////////////////////////////////////////////////////////////


K3bMediaCache::K3bMediaCache( TQObject* parent )
  : TQObject( parent )
{
}


K3bMediaCache::~K3bMediaCache()
{
  clearDeviceList();
}


int K3bMediaCache::blockDevice( K3bDevice::Device* dev )
{
  DeviceEntry* e = findDeviceEntry( dev );
  if( e ) {
    if( e->blockedId )
      return -1;
    else {
      // block the information
      e->mutex.lock();

      // create (hopefully) unique id
      e->blockedId = KApplication::random();

      // let the info go
      e->mutex.unlock();

      // wait for the thread to stop
      e->thread->wait();

      return e->blockedId;
    }
  }
  else
    return -1;
}


bool K3bMediaCache::unblockDevice( K3bDevice::Device* dev, int id )
{
  DeviceEntry* e = findDeviceEntry( dev );
  if( e && e->blockedId && e->blockedId == id ) {
    e->blockedId = 0;

    // for security reasons we emit no medium signal at this point
    // otherwise a job might resuse the old medium information
    e->medium = K3bMedium( dev );
    emit mediumChanged( dev );

    // restart the poll thread
    e->thread->start();

    return true;
  }
  else
    return false;
}


bool K3bMediaCache::isBlocked( K3bDevice::Device* dev )
{
  if( DeviceEntry* e = findDeviceEntry( dev ) )
    return ( e->blockedId != 0 );
  else
    return false;
}


K3bMedium K3bMediaCache::medium( K3bDevice::Device* dev )
{
  if( DeviceEntry* e = findDeviceEntry( dev ) ) {
    e->mutex.lock();
    K3bMedium m = e->medium;
    e->mutex.unlock();
    return m;
  }
  else
    return K3bMedium();
}


K3bDevice::DiskInfo K3bMediaCache::diskInfo( K3bDevice::Device* dev )
{
  if( DeviceEntry* e = findDeviceEntry( dev ) ) {
    e->mutex.lock();
    K3bDevice::DiskInfo di = e->medium.diskInfo();
    e->mutex.unlock();
    return di;
  }
  else
    return K3bDevice::DiskInfo();
}


K3bDevice::Toc K3bMediaCache::toc( K3bDevice::Device* dev )
{
  if( DeviceEntry* e = findDeviceEntry( dev ) ) {
    e->mutex.lock();
    K3bDevice::Toc toc = e->medium.toc();
    e->mutex.unlock();
    return toc;
  }
  else
    return K3bDevice::Toc();
}


K3bDevice::CdText K3bMediaCache::cdText( K3bDevice::Device* dev )
{
  if( DeviceEntry* e = findDeviceEntry( dev ) ) {
    e->mutex.lock();
    K3bDevice::CdText cdt = e->medium.cdText();
    e->mutex.unlock();
    return cdt;
  }
  else
    return K3bDevice::CdText();
}


TQValueList<int> K3bMediaCache::writingSpeeds( K3bDevice::Device* dev )
{
  if( DeviceEntry* e = findDeviceEntry( dev ) ) {
    e->mutex.lock();
    TQValueList<int> ws = e->medium.writingSpeeds();
    e->mutex.unlock();
    return ws;
  }
  else
    return TQValueList<int>();
}


TQString K3bMediaCache::mediumString( K3bDevice::Device* device, bool useContent )
{
  if( DeviceEntry* e = findDeviceEntry( device ) ) {
    return e->medium.shortString( useContent );
  }
  else
    return TQString();
}


void K3bMediaCache::clearDeviceList()
{
  kdDebug() << k_funcinfo << endl;

  // make all the threads stop
  for( TQMap<K3bDevice::Device*, DeviceEntry*>::iterator it = m_deviceMap.begin(); 
       it != m_deviceMap.end(); ++it ) {
    it.data()->blockedId = 1;
  }

  // and remove them
  for( TQMap<K3bDevice::Device*, DeviceEntry*>::iterator it = m_deviceMap.begin(); 
       it != m_deviceMap.end(); ++it ) {
    kdDebug() << k_funcinfo << " waiting for info thread " << it.key()->blockDeviceName() << " to finish" << endl;
    it.data()->thread->wait();
    delete it.data();
  }

  m_deviceMap.clear();
}


void K3bMediaCache::buildDeviceList( K3bDevice::DeviceManager* dm )
{
  // remember blocked ids
  TQMap<K3bDevice::Device*, int> blockedIds;
  for( TQMap<K3bDevice::Device*, DeviceEntry*>::iterator it = m_deviceMap.begin(); 
       it != m_deviceMap.end(); ++it )
    blockedIds.insert( it.key(), it.data()->blockedId );

  clearDeviceList();

  const TQPtrList<K3bDevice::Device>& devices = dm->allDevices();
  for( TQPtrListIterator<K3bDevice::Device> it( devices ); *it; ++it ) {
    m_deviceMap.insert( *it, new DeviceEntry( this, *it ) );
    TQMap<K3bDevice::Device*, int>::const_iterator bi_it = blockedIds.find( *it );
    if( bi_it != blockedIds.end() )
      m_deviceMap[*it]->blockedId = bi_it.data();
  }

  // start all the polling threads
  for( TQMap<K3bDevice::Device*, DeviceEntry*>::iterator it = m_deviceMap.begin(); 
       it != m_deviceMap.end(); ++it ) {
    if( !it.data()->blockedId )
      it.data()->thread->start();
  }
}


K3bMediaCache::DeviceEntry* K3bMediaCache::findDeviceEntry( K3bDevice::Device* dev )
{
  TQMap<K3bDevice::Device*, DeviceEntry*>::iterator it = m_deviceMap.find( dev );
  if( it != m_deviceMap.end() )
    return it.data();
  else
    return 0;
}


void K3bMediaCache::customEvent( TQCustomEvent* e )
{
  if( e->type() == MediaChangeEvent::EventCode )
    emit mediumChanged( static_cast<MediaChangeEvent*>( e )->device() );
}

#include "k3bmediacache.moc"