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      1 /*
      2  * Copyright (C) 2016 The Android Open Source Project
      3  * Copyright (C) 2016 Mopria Alliance, Inc.
      4  *
      5  * Licensed under the Apache License, Version 2.0 (the "License");
      6  * you may not use this file except in compliance with the License.
      7  * You may obtain a copy of the License at
      8  *
      9  *      http://www.apache.org/licenses/LICENSE-2.0
     10  *
     11  * Unless required by applicable law or agreed to in writing, software
     12  * distributed under the License is distributed on an "AS IS" BASIS,
     13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     14  * See the License for the specific language governing permissions and
     15  * limitations under the License.
     16  */
     17 
     18 package com.android.bips;
     19 
     20 import android.content.Context;
     21 import android.content.pm.PackageInfo;
     22 import android.content.pm.PackageManager;
     23 import android.net.wifi.WifiManager;
     24 import android.os.Handler;
     25 import android.printservice.PrintJob;
     26 import android.printservice.PrintService;
     27 import android.printservice.PrinterDiscoverySession;
     28 import android.util.Log;
     29 
     30 import com.android.bips.discovery.Discovery;
     31 import com.android.bips.discovery.ManualDiscovery;
     32 import com.android.bips.discovery.MdnsDiscovery;
     33 import com.android.bips.discovery.MultiDiscovery;
     34 import com.android.bips.ipp.Backend;
     35 import com.android.bips.ipp.CapabilitiesCache;
     36 import com.android.bips.util.WifiMonitor;
     37 
     38 import java.lang.ref.WeakReference;
     39 
     40 public class BuiltInPrintService extends PrintService {
     41     private static final String TAG = BuiltInPrintService.class.getSimpleName();
     42     private static final boolean DEBUG = false;
     43 
     44     // Present because local activities can bind, but cannot access this object directly
     45     private static WeakReference<BuiltInPrintService> sInstance;
     46 
     47     private Discovery mDiscovery;
     48     private ManualDiscovery mManualDiscovery;
     49     private CapabilitiesCache mCapabilitiesCache;
     50     private JobQueue mJobQueue;
     51     private Handler mMainHandler;
     52     private Backend mBackend;
     53     private WifiManager.WifiLock mWifiLock;
     54 
     55     /**
     56      * Return the current print service instance, if running
     57      */
     58     public static BuiltInPrintService getInstance() {
     59         return sInstance == null ? null : sInstance.get();
     60     }
     61 
     62     @Override
     63     public void onCreate() {
     64         if (DEBUG) {
     65             try {
     66                 PackageInfo pInfo = getPackageManager().getPackageInfo(getPackageName(), 0);
     67                 String version = pInfo.versionName;
     68                 Log.d(TAG, "onCreate() " + version);
     69             } catch (PackageManager.NameNotFoundException ignored) {
     70             }
     71         }
     72         super.onCreate();
     73 
     74         sInstance = new WeakReference<>(this);
     75         mBackend = new Backend(this);
     76         mCapabilitiesCache = new CapabilitiesCache(this, mBackend,
     77                 CapabilitiesCache.DEFAULT_MAX_CONCURRENT);
     78         mManualDiscovery = new ManualDiscovery(this);
     79         mDiscovery = new MultiDiscovery(this, new WifiMonitor.Factory(), new MdnsDiscovery(this),
     80                 mManualDiscovery);
     81         mJobQueue = new JobQueue();
     82         mMainHandler = new Handler(getMainLooper());
     83         WifiManager wifiManager = (WifiManager)getSystemService(Context.WIFI_SERVICE);
     84         mWifiLock = wifiManager.createWifiLock(WifiManager.WIFI_MODE_FULL, TAG);
     85     }
     86 
     87     @Override
     88     public void onDestroy() {
     89         if (DEBUG) Log.d(TAG, "onDestroy()");
     90         mCapabilitiesCache.close();
     91         mManualDiscovery.close();
     92         mBackend.close();
     93         unlockWifi();
     94         sInstance = null;
     95         mMainHandler.removeCallbacksAndMessages(null);
     96         super.onDestroy();
     97     }
     98 
     99     @Override
    100     protected PrinterDiscoverySession onCreatePrinterDiscoverySession() {
    101         if (DEBUG) Log.d(TAG, "onCreatePrinterDiscoverySession");
    102         return new LocalDiscoverySession(this);
    103     }
    104 
    105     @Override
    106     protected void onPrintJobQueued(PrintJob printJob) {
    107         if (DEBUG) Log.d(TAG, "onPrintJobQueued");
    108         if (WifiMonitor.isConnected(this)) {
    109             mJobQueue.print(new LocalPrintJob(this, mBackend, printJob));
    110         } else {
    111             printJob.fail(getString(R.string.wifi_not_connected));
    112         }
    113     }
    114 
    115     @Override
    116     protected void onRequestCancelPrintJob(PrintJob printJob) {
    117         if (DEBUG) Log.d(TAG, "onRequestCancelPrintJob");
    118         mJobQueue.cancel(printJob.getId());
    119     }
    120 
    121     /**
    122      * Return the global discovery object
    123      */
    124     Discovery getDiscovery() {
    125         return mDiscovery;
    126     }
    127 
    128     public ManualDiscovery getManualDiscovery() {
    129         return mManualDiscovery;
    130     }
    131 
    132     /**
    133      * Return the global Printer Capabilities cache
    134      */
    135     public CapabilitiesCache getCapabilitiesCache() {
    136         return mCapabilitiesCache;
    137     }
    138 
    139     /** Return the main handler for running on main UI */
    140     public Handler getMainHandler() {
    141         return mMainHandler;
    142     }
    143 
    144     /** Prevent Wi-Fi from going to sleep until {@link #unlockWifi} is called */
    145     public void lockWifi() {
    146         if (!mWifiLock.isHeld()) {
    147             mWifiLock.acquire();
    148         }
    149     }
    150 
    151     /** Allow Wi-Fi to be disabled during sleep modes. */
    152     public void unlockWifi() {
    153         if (mWifiLock.isHeld()) {
    154             mWifiLock.release();
    155         }
    156     }
    157 }