Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2013 The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package android.print; |
| 18 | |
| 19 | import android.content.Context; |
Svetoslav | 2fbd2a7 | 2013-09-16 17:53:51 -0700 | [diff] [blame] | 20 | import android.content.pm.ParceledListSlice; |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 21 | import android.os.Handler; |
| 22 | import android.os.Looper; |
| 23 | import android.os.Message; |
| 24 | import android.os.RemoteException; |
| 25 | import android.util.ArrayMap; |
| 26 | import android.util.Log; |
| 27 | |
| 28 | import java.lang.ref.WeakReference; |
| 29 | import java.util.ArrayList; |
| 30 | import java.util.Collections; |
Svetoslav Ganov | cfab245 | 2013-09-28 12:09:23 -0700 | [diff] [blame] | 31 | import java.util.LinkedHashMap; |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 32 | import java.util.List; |
| 33 | |
| 34 | /** |
| 35 | * @hide |
| 36 | */ |
| 37 | public final class PrinterDiscoverySession { |
| 38 | |
| 39 | private static final String LOG_TAG ="PrinterDiscoverySession"; |
| 40 | |
| 41 | private static final int MSG_PRINTERS_ADDED = 1; |
| 42 | private static final int MSG_PRINTERS_REMOVED = 2; |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 43 | |
Svetoslav Ganov | cfab245 | 2013-09-28 12:09:23 -0700 | [diff] [blame] | 44 | private final LinkedHashMap<PrinterId, PrinterInfo> mPrinters = |
| 45 | new LinkedHashMap<PrinterId, PrinterInfo>(); |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 46 | |
| 47 | private final IPrintManager mPrintManager; |
| 48 | |
| 49 | private final int mUserId; |
| 50 | |
| 51 | private final Handler mHandler; |
| 52 | |
| 53 | private IPrinterDiscoveryObserver mObserver; |
| 54 | |
| 55 | private OnPrintersChangeListener mListener; |
| 56 | |
| 57 | private boolean mIsPrinterDiscoveryStarted; |
| 58 | |
| 59 | public static interface OnPrintersChangeListener { |
| 60 | public void onPrintersChanged(); |
| 61 | } |
| 62 | |
| 63 | PrinterDiscoverySession(IPrintManager printManager, Context context, int userId) { |
| 64 | mPrintManager = printManager; |
| 65 | mUserId = userId; |
| 66 | mHandler = new SessionHandler(context.getMainLooper()); |
| 67 | mObserver = new PrinterDiscoveryObserver(this); |
| 68 | try { |
| 69 | mPrintManager.createPrinterDiscoverySession(mObserver, mUserId); |
| 70 | } catch (RemoteException re) { |
| 71 | Log.e(LOG_TAG, "Error creating printer discovery session", re); |
| 72 | } |
| 73 | } |
| 74 | |
Svetoslav | a798c0a | 2014-05-15 10:47:19 -0700 | [diff] [blame] | 75 | public final void startPrinterDiscovery(List<PrinterId> priorityList) { |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 76 | if (isDestroyed()) { |
Svetoslav | a798c0a | 2014-05-15 10:47:19 -0700 | [diff] [blame] | 77 | Log.w(LOG_TAG, "Ignoring start printers discovery - session destroyed"); |
Svetoslav Ganov | d26d489 | 2013-08-28 14:37:54 -0700 | [diff] [blame] | 78 | return; |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 79 | } |
| 80 | if (!mIsPrinterDiscoveryStarted) { |
| 81 | mIsPrinterDiscoveryStarted = true; |
| 82 | try { |
| 83 | mPrintManager.startPrinterDiscovery(mObserver, priorityList, mUserId); |
| 84 | } catch (RemoteException re) { |
| 85 | Log.e(LOG_TAG, "Error starting printer discovery", re); |
| 86 | } |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | public final void stopPrinterDiscovery() { |
| 91 | if (isDestroyed()) { |
| 92 | Log.w(LOG_TAG, "Ignoring stop printers discovery - session destroyed"); |
Svetoslav Ganov | d26d489 | 2013-08-28 14:37:54 -0700 | [diff] [blame] | 93 | return; |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 94 | } |
| 95 | if (mIsPrinterDiscoveryStarted) { |
| 96 | mIsPrinterDiscoveryStarted = false; |
| 97 | try { |
| 98 | mPrintManager.stopPrinterDiscovery(mObserver, mUserId); |
| 99 | } catch (RemoteException re) { |
| 100 | Log.e(LOG_TAG, "Error stopping printer discovery", re); |
| 101 | } |
| 102 | } |
| 103 | } |
| 104 | |
Svetoslav Ganov | d26d489 | 2013-08-28 14:37:54 -0700 | [diff] [blame] | 105 | public final void startPrinterStateTracking(PrinterId printerId) { |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 106 | if (isDestroyed()) { |
Svetoslav Ganov | d26d489 | 2013-08-28 14:37:54 -0700 | [diff] [blame] | 107 | Log.w(LOG_TAG, "Ignoring start printer state tracking - session destroyed"); |
| 108 | return; |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 109 | } |
| 110 | try { |
Svetoslav Ganov | d26d489 | 2013-08-28 14:37:54 -0700 | [diff] [blame] | 111 | mPrintManager.startPrinterStateTracking(printerId, mUserId); |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 112 | } catch (RemoteException re) { |
Svetoslav Ganov | d26d489 | 2013-08-28 14:37:54 -0700 | [diff] [blame] | 113 | Log.e(LOG_TAG, "Error starting printer state tracking", re); |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | public final void stopPrinterStateTracking(PrinterId printerId) { |
| 118 | if (isDestroyed()) { |
| 119 | Log.w(LOG_TAG, "Ignoring stop printer state tracking - session destroyed"); |
| 120 | return; |
| 121 | } |
| 122 | try { |
| 123 | mPrintManager.stopPrinterStateTracking(printerId, mUserId); |
| 124 | } catch (RemoteException re) { |
Svetoslav | a798c0a | 2014-05-15 10:47:19 -0700 | [diff] [blame] | 125 | Log.e(LOG_TAG, "Error stopping printer state tracking", re); |
Svetoslav Ganov | d26d489 | 2013-08-28 14:37:54 -0700 | [diff] [blame] | 126 | } |
| 127 | } |
| 128 | |
| 129 | public final void validatePrinters(List<PrinterId> printerIds) { |
| 130 | if (isDestroyed()) { |
| 131 | Log.w(LOG_TAG, "Ignoring validate printers - session destroyed"); |
| 132 | return; |
| 133 | } |
| 134 | try { |
| 135 | mPrintManager.validatePrinters(printerIds, mUserId); |
| 136 | } catch (RemoteException re) { |
| 137 | Log.e(LOG_TAG, "Error validating printers", re); |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 138 | } |
| 139 | } |
| 140 | |
| 141 | public final void destroy() { |
| 142 | if (isDestroyed()) { |
| 143 | Log.w(LOG_TAG, "Ignoring destroy - session destroyed"); |
| 144 | } |
| 145 | destroyNoCheck(); |
| 146 | } |
| 147 | |
| 148 | public final List<PrinterInfo> getPrinters() { |
| 149 | if (isDestroyed()) { |
| 150 | Log.w(LOG_TAG, "Ignoring get printers - session destroyed"); |
| 151 | return Collections.emptyList(); |
| 152 | } |
| 153 | return new ArrayList<PrinterInfo>(mPrinters.values()); |
| 154 | } |
| 155 | |
| 156 | public final boolean isDestroyed() { |
| 157 | throwIfNotCalledOnMainThread(); |
| 158 | return isDestroyedNoCheck(); |
| 159 | } |
| 160 | |
| 161 | public final boolean isPrinterDiscoveryStarted() { |
| 162 | throwIfNotCalledOnMainThread(); |
| 163 | return mIsPrinterDiscoveryStarted; |
| 164 | } |
| 165 | |
| 166 | public final void setOnPrintersChangeListener(OnPrintersChangeListener listener) { |
| 167 | throwIfNotCalledOnMainThread(); |
| 168 | mListener = listener; |
| 169 | } |
| 170 | |
| 171 | @Override |
| 172 | protected final void finalize() throws Throwable { |
| 173 | if (!isDestroyedNoCheck()) { |
| 174 | Log.e(LOG_TAG, "Destroying leaked printer discovery session"); |
| 175 | destroyNoCheck(); |
| 176 | } |
| 177 | super.finalize(); |
| 178 | } |
| 179 | |
| 180 | private boolean isDestroyedNoCheck() { |
| 181 | return (mObserver == null); |
| 182 | } |
| 183 | |
| 184 | private void destroyNoCheck() { |
| 185 | stopPrinterDiscovery(); |
| 186 | try { |
| 187 | mPrintManager.destroyPrinterDiscoverySession(mObserver, mUserId); |
| 188 | } catch (RemoteException re) { |
| 189 | Log.e(LOG_TAG, "Error destroying printer discovery session", re); |
| 190 | } finally { |
| 191 | mObserver = null; |
| 192 | mPrinters.clear(); |
| 193 | } |
| 194 | } |
| 195 | |
Svetoslav | c335eb4 | 2013-09-26 15:55:47 -0700 | [diff] [blame] | 196 | private void handlePrintersAdded(List<PrinterInfo> addedPrinters) { |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 197 | if (isDestroyed()) { |
| 198 | return; |
| 199 | } |
Svetoslav | c335eb4 | 2013-09-26 15:55:47 -0700 | [diff] [blame] | 200 | |
| 201 | // No old printers - do not bother keeping their position. |
| 202 | if (mPrinters.isEmpty()) { |
| 203 | final int printerCount = addedPrinters.size(); |
| 204 | for (int i = 0; i < printerCount; i++) { |
| 205 | PrinterInfo printer = addedPrinters.get(i); |
| 206 | mPrinters.put(printer.getId(), printer); |
| 207 | } |
| 208 | notifyOnPrintersChanged(); |
| 209 | return; |
| 210 | } |
| 211 | |
| 212 | // Add the printers to a map. |
| 213 | ArrayMap<PrinterId, PrinterInfo> addedPrintersMap = |
| 214 | new ArrayMap<PrinterId, PrinterInfo>(); |
| 215 | final int printerCount = addedPrinters.size(); |
| 216 | for (int i = 0; i < printerCount; i++) { |
| 217 | PrinterInfo printer = addedPrinters.get(i); |
| 218 | addedPrintersMap.put(printer.getId(), printer); |
| 219 | } |
| 220 | |
| 221 | // Update printers we already have. |
Svetoslav Ganov | cfab245 | 2013-09-28 12:09:23 -0700 | [diff] [blame] | 222 | for (PrinterId oldPrinterId : mPrinters.keySet()) { |
Svetoslav | c335eb4 | 2013-09-26 15:55:47 -0700 | [diff] [blame] | 223 | PrinterInfo updatedPrinter = addedPrintersMap.remove(oldPrinterId); |
| 224 | if (updatedPrinter != null) { |
| 225 | mPrinters.put(oldPrinterId, updatedPrinter); |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 226 | } |
| 227 | } |
Svetoslav | c335eb4 | 2013-09-26 15:55:47 -0700 | [diff] [blame] | 228 | |
| 229 | // Add the new printers, i.e. what is left. |
| 230 | mPrinters.putAll(addedPrintersMap); |
| 231 | |
| 232 | // Announce the change. |
| 233 | notifyOnPrintersChanged(); |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 234 | } |
| 235 | |
| 236 | private void handlePrintersRemoved(List<PrinterId> printerIds) { |
| 237 | if (isDestroyed()) { |
| 238 | return; |
| 239 | } |
| 240 | boolean printersChanged = false; |
| 241 | final int removedPrinterIdCount = printerIds.size(); |
| 242 | for (int i = 0; i < removedPrinterIdCount; i++) { |
| 243 | PrinterId removedPrinterId = printerIds.get(i); |
| 244 | if (mPrinters.remove(removedPrinterId) != null) { |
| 245 | printersChanged = true; |
| 246 | } |
| 247 | } |
| 248 | if (printersChanged) { |
| 249 | notifyOnPrintersChanged(); |
| 250 | } |
| 251 | } |
| 252 | |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 253 | private void notifyOnPrintersChanged() { |
| 254 | if (mListener != null) { |
| 255 | mListener.onPrintersChanged(); |
| 256 | } |
| 257 | } |
| 258 | |
| 259 | private static void throwIfNotCalledOnMainThread() { |
| 260 | if (!Looper.getMainLooper().isCurrentThread()) { |
| 261 | throw new IllegalAccessError("must be called from the main thread"); |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | private final class SessionHandler extends Handler { |
| 266 | |
| 267 | public SessionHandler(Looper looper) { |
| 268 | super(looper, null, false); |
| 269 | } |
| 270 | |
| 271 | @Override |
| 272 | @SuppressWarnings("unchecked") |
| 273 | public void handleMessage(Message message) { |
| 274 | switch (message.what) { |
| 275 | case MSG_PRINTERS_ADDED: { |
| 276 | List<PrinterInfo> printers = (List<PrinterInfo>) message.obj; |
| 277 | handlePrintersAdded(printers); |
| 278 | } break; |
| 279 | |
| 280 | case MSG_PRINTERS_REMOVED: { |
| 281 | List<PrinterId> printerIds = (List<PrinterId>) message.obj; |
| 282 | handlePrintersRemoved(printerIds); |
| 283 | } break; |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 284 | } |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | private static final class PrinterDiscoveryObserver extends IPrinterDiscoveryObserver.Stub { |
| 289 | |
| 290 | private final WeakReference<PrinterDiscoverySession> mWeakSession; |
| 291 | |
| 292 | public PrinterDiscoveryObserver(PrinterDiscoverySession session) { |
| 293 | mWeakSession = new WeakReference<PrinterDiscoverySession>(session); |
| 294 | } |
| 295 | |
| 296 | @Override |
Svetoslav | 2fbd2a7 | 2013-09-16 17:53:51 -0700 | [diff] [blame] | 297 | @SuppressWarnings("rawtypes") |
| 298 | public void onPrintersAdded(ParceledListSlice printers) { |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 299 | PrinterDiscoverySession session = mWeakSession.get(); |
| 300 | if (session != null) { |
| 301 | session.mHandler.obtainMessage(MSG_PRINTERS_ADDED, |
Svetoslav | 2fbd2a7 | 2013-09-16 17:53:51 -0700 | [diff] [blame] | 302 | printers.getList()).sendToTarget(); |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 303 | } |
| 304 | } |
| 305 | |
| 306 | @Override |
Svetoslav | 2fbd2a7 | 2013-09-16 17:53:51 -0700 | [diff] [blame] | 307 | @SuppressWarnings("rawtypes") |
| 308 | public void onPrintersRemoved(ParceledListSlice printerIds) { |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 309 | PrinterDiscoverySession session = mWeakSession.get(); |
| 310 | if (session != null) { |
| 311 | session.mHandler.obtainMessage(MSG_PRINTERS_REMOVED, |
Svetoslav | 2fbd2a7 | 2013-09-16 17:53:51 -0700 | [diff] [blame] | 312 | printerIds.getList()).sendToTarget(); |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 313 | } |
| 314 | } |
Svetoslav Ganov | 44720af | 2013-08-20 16:32:53 -0700 | [diff] [blame] | 315 | } |
| 316 | } |