Philip P. Moltmann | 63498af | 2016-05-27 14:10:54 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | package com.android.printservice.recommendation.plugin.xerox; |
| 17 | |
| 18 | import android.content.Context; |
| 19 | import android.net.nsd.NsdManager; |
| 20 | import android.net.nsd.NsdServiceInfo; |
| 21 | import android.text.TextUtils; |
| 22 | import com.android.printservice.recommendation.util.DiscoveryListenerMultiplexer; |
| 23 | import com.android.printservice.recommendation.util.NsdResolveQueue; |
| 24 | |
| 25 | import java.util.ArrayList; |
| 26 | import java.util.LinkedList; |
| 27 | import java.util.List; |
| 28 | |
| 29 | class ServiceResolver { |
| 30 | |
| 31 | private final NsdManager mNSDManager; |
| 32 | private final String[] mServiceType; |
| 33 | private final Observer mObserver; |
| 34 | private final VendorInfo mVendorInfo; |
| 35 | private final String[] mPDLs; |
| 36 | private final PrinterHashMap mPrinterHashMap = new PrinterHashMap(); |
| 37 | private final List<NsdManager.DiscoveryListener> mListeners = new ArrayList<>(); |
| 38 | private final NsdResolveQueue mNsdResolveQueue; |
| 39 | |
| 40 | public interface Observer { |
| 41 | void dataSetChanged(); |
| 42 | } |
| 43 | |
| 44 | public ServiceResolver(Context context, Observer observer, VendorInfo vendorInfo, String[] serviceTypes, String[] pdls) { |
| 45 | mNsdResolveQueue = NsdResolveQueue.getInstance(); |
| 46 | mObserver = observer; |
| 47 | mServiceType = serviceTypes; |
| 48 | mNSDManager = (NsdManager) context.getSystemService(Context.NSD_SERVICE); |
| 49 | mVendorInfo = vendorInfo; |
| 50 | mPDLs = pdls; |
| 51 | } |
| 52 | |
| 53 | public void start() { |
| 54 | stop(); |
| 55 | for (final String service : mServiceType) { |
| 56 | NsdManager.DiscoveryListener listener = new NsdManager.DiscoveryListener() { |
| 57 | @Override |
| 58 | public void onStartDiscoveryFailed(String s, int i) { |
| 59 | |
| 60 | } |
| 61 | |
| 62 | @Override |
| 63 | public void onStopDiscoveryFailed(String s, int i) { |
| 64 | |
| 65 | } |
| 66 | |
| 67 | @Override |
| 68 | public void onDiscoveryStarted(String s) { |
| 69 | |
| 70 | } |
| 71 | |
| 72 | @Override |
| 73 | public void onDiscoveryStopped(String s) { |
| 74 | |
| 75 | } |
| 76 | |
| 77 | @Override |
| 78 | public void onServiceFound(NsdServiceInfo nsdServiceInfo) { |
| 79 | queueRequest(nsdServiceInfo); |
| 80 | } |
| 81 | |
| 82 | @Override |
| 83 | public void onServiceLost(NsdServiceInfo nsdServiceInfo) { |
| 84 | removeRequest(nsdServiceInfo); |
| 85 | printerRemoved(nsdServiceInfo); |
| 86 | } |
| 87 | }; |
| 88 | DiscoveryListenerMultiplexer.addListener(mNSDManager, service, listener); |
| 89 | mListeners.add(listener); |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | public void stop() { |
| 94 | for (NsdManager.DiscoveryListener listener : mListeners) { |
| 95 | DiscoveryListenerMultiplexer.removeListener(mNSDManager, listener); |
| 96 | } |
| 97 | mListeners.clear(); |
| 98 | clearRequests(); |
| 99 | } |
| 100 | |
| 101 | //Resolving nsd services |
| 102 | private final LinkedList<NsdServiceInfo> mQueue = new LinkedList<>(); |
| 103 | private final Object mLock = new Object(); |
| 104 | private NsdServiceInfo mCurrentRequest = null; |
| 105 | |
| 106 | private void queueRequest(NsdServiceInfo serviceInfo) { |
| 107 | synchronized (mLock) { |
| 108 | if (mQueue.contains(serviceInfo)) return; |
| 109 | mQueue.add(serviceInfo); |
| 110 | makeNextRequest(); |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | private void removeRequest(NsdServiceInfo serviceInfo) { |
| 115 | synchronized (mLock) { |
| 116 | mQueue.remove(serviceInfo); |
| 117 | if ((mCurrentRequest != null) && serviceInfo.equals(mCurrentRequest)) |
| 118 | mCurrentRequest = null; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | private void clearRequests() { |
| 123 | synchronized (mLock) { |
| 124 | mQueue.clear(); |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | private void makeNextRequest() { |
| 129 | synchronized (mLock) { |
| 130 | if (mCurrentRequest != null) return; |
| 131 | if (mQueue.isEmpty()) return; |
| 132 | mCurrentRequest = mQueue.removeFirst(); |
| 133 | mNsdResolveQueue.resolve(mNSDManager, mCurrentRequest, new NsdManager.ResolveListener() { |
| 134 | @Override |
| 135 | public void onResolveFailed(NsdServiceInfo nsdServiceInfo, int i) { |
| 136 | synchronized (mLock) { |
| 137 | if (mCurrentRequest != null) mQueue.add(mCurrentRequest); |
| 138 | makeNextRequest(); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | @Override |
| 143 | public void onServiceResolved(NsdServiceInfo nsdServiceInfo) { |
| 144 | synchronized (mLock) { |
| 145 | if (mCurrentRequest != null) { |
| 146 | printerFound(nsdServiceInfo); |
| 147 | mCurrentRequest = null; |
| 148 | } |
| 149 | makeNextRequest(); |
| 150 | } |
| 151 | } |
| 152 | }); |
| 153 | |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | private void printerFound(NsdServiceInfo nsdServiceInfo) { |
| 158 | if (nsdServiceInfo == null) return; |
| 159 | if (TextUtils.isEmpty(PrinterHashMap.getKey(nsdServiceInfo))) return; |
| 160 | String vendor = MDnsUtils.getVendor(nsdServiceInfo); |
| 161 | if (vendor == null) vendor = ""; |
| 162 | |
| 163 | for (String vendorValues : mVendorInfo.mDNSValues) { |
| 164 | if (vendor.equalsIgnoreCase(vendorValues)) { |
| 165 | vendor = mVendorInfo.mVendorID; |
| 166 | break; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | if ((vendor != mVendorInfo.mVendorID) && |
| 171 | MDnsUtils.isVendorPrinter(nsdServiceInfo, mVendorInfo.mDNSValues)) { |
| 172 | vendor = mVendorInfo.mVendorID; |
| 173 | } |
| 174 | |
| 175 | if (!(vendor == mVendorInfo.mVendorID)) { |
| 176 | return; |
| 177 | } |
| 178 | |
| 179 | if (!MDnsUtils.checkPDLSupport(nsdServiceInfo, mPDLs)) { |
| 180 | return; |
| 181 | } |
| 182 | |
| 183 | if ((mPrinterHashMap.addPrinter(nsdServiceInfo) == null)) { |
| 184 | mObserver.dataSetChanged(); |
| 185 | } |
| 186 | |
| 187 | } |
| 188 | |
| 189 | private void printerRemoved(NsdServiceInfo nsdServiceInfo) { |
| 190 | if ((mPrinterHashMap.removePrinter(nsdServiceInfo) != null)) { |
| 191 | mObserver.dataSetChanged(); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | public int getCount() { |
| 196 | return mPrinterHashMap.size(); |
| 197 | } |
| 198 | |
| 199 | } |