Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2014 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.net; |
| 18 | |
| 19 | import android.content.Context; |
| 20 | import android.os.Handler; |
| 21 | import android.os.Looper; |
| 22 | import android.os.Message; |
| 23 | import android.os.Messenger; |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 24 | import android.util.Log; |
| 25 | import android.util.SparseArray; |
| 26 | |
Robert Greenwalt | 348e98d | 2015-06-05 17:55:36 -0700 | [diff] [blame] | 27 | import com.android.internal.annotations.VisibleForTesting; |
Robert Greenwalt | 3d68dee | 2015-06-10 20:25:14 -0700 | [diff] [blame] | 28 | import com.android.internal.util.IndentingPrintWriter; |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 29 | import com.android.internal.util.Protocol; |
| 30 | |
Robert Greenwalt | 3d68dee | 2015-06-10 20:25:14 -0700 | [diff] [blame] | 31 | import java.io.FileDescriptor; |
| 32 | import java.io.PrintWriter; |
| 33 | |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 34 | /** |
| 35 | * A NetworkFactory is an entity that creates NetworkAgent objects. |
| 36 | * The bearers register with ConnectivityService using {@link #register} and |
| 37 | * their factory will start receiving scored NetworkRequests. NetworkRequests |
| 38 | * can be filtered 3 ways: by NetworkCapabilities, by score and more complexly by |
| 39 | * overridden function. All of these can be dynamic - changing NetworkCapabilities |
| 40 | * or score forces re-evaluation of all current requests. |
| 41 | * |
| 42 | * If any requests pass the filter some overrideable functions will be called. |
| 43 | * If the bearer only cares about very simple start/stopNetwork callbacks, those |
| 44 | * functions can be overridden. If the bearer needs more interaction, it can |
| 45 | * override addNetworkRequest and removeNetworkRequest which will give it each |
| 46 | * request that passes their current filters. |
| 47 | * @hide |
| 48 | **/ |
| 49 | public class NetworkFactory extends Handler { |
| 50 | private static final boolean DBG = true; |
Robert Greenwalt | fc0c689 | 2014-08-27 14:34:02 -0700 | [diff] [blame] | 51 | private static final boolean VDBG = false; |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 52 | |
| 53 | private static final int BASE = Protocol.BASE_NETWORK_FACTORY; |
| 54 | /** |
| 55 | * Pass a network request to the bearer. If the bearer believes it can |
| 56 | * satisfy the request it should connect to the network and create a |
| 57 | * NetworkAgent. Once the NetworkAgent is fully functional it will |
| 58 | * register itself with ConnectivityService using registerNetworkAgent. |
| 59 | * If the bearer cannot immediately satisfy the request (no network, |
| 60 | * user disabled the radio, lower-scored network) it should remember |
| 61 | * any NetworkRequests it may be able to satisfy in the future. It may |
| 62 | * disregard any that it will never be able to service, for example |
| 63 | * those requiring a different bearer. |
| 64 | * msg.obj = NetworkRequest |
| 65 | * msg.arg1 = score - the score of the any network currently satisfying this |
| 66 | * request. If this bearer knows in advance it cannot |
| 67 | * exceed this score it should not try to connect, holding the request |
| 68 | * for the future. |
| 69 | * Note that subsequent events may give a different (lower |
| 70 | * or higher) score for this request, transmitted to each |
| 71 | * NetworkFactory through additional CMD_REQUEST_NETWORK msgs |
| 72 | * with the same NetworkRequest but an updated score. |
| 73 | * Also, network conditions may change for this bearer |
| 74 | * allowing for a better score in the future. |
| 75 | */ |
| 76 | public static final int CMD_REQUEST_NETWORK = BASE; |
| 77 | |
| 78 | /** |
| 79 | * Cancel a network request |
| 80 | * msg.obj = NetworkRequest |
| 81 | */ |
| 82 | public static final int CMD_CANCEL_REQUEST = BASE + 1; |
| 83 | |
| 84 | /** |
| 85 | * Internally used to set our best-guess score. |
| 86 | * msg.arg1 = new score |
| 87 | */ |
| 88 | private static final int CMD_SET_SCORE = BASE + 2; |
| 89 | |
| 90 | /** |
| 91 | * Internally used to set our current filter for coarse bandwidth changes with |
| 92 | * technology changes. |
| 93 | * msg.obj = new filter |
| 94 | */ |
| 95 | private static final int CMD_SET_FILTER = BASE + 3; |
| 96 | |
| 97 | private final Context mContext; |
| 98 | private final String LOG_TAG; |
| 99 | |
| 100 | private final SparseArray<NetworkRequestInfo> mNetworkRequests = |
| 101 | new SparseArray<NetworkRequestInfo>(); |
| 102 | |
| 103 | private int mScore; |
| 104 | private NetworkCapabilities mCapabilityFilter; |
| 105 | |
| 106 | private int mRefCount = 0; |
| 107 | private Messenger mMessenger = null; |
| 108 | |
| 109 | public NetworkFactory(Looper looper, Context context, String logTag, |
| 110 | NetworkCapabilities filter) { |
| 111 | super(looper); |
| 112 | LOG_TAG = logTag; |
| 113 | mContext = context; |
| 114 | mCapabilityFilter = filter; |
| 115 | } |
| 116 | |
| 117 | public void register() { |
| 118 | if (DBG) log("Registering NetworkFactory"); |
| 119 | if (mMessenger == null) { |
| 120 | mMessenger = new Messenger(this); |
| 121 | ConnectivityManager.from(mContext).registerNetworkFactory(mMessenger, LOG_TAG); |
| 122 | } |
| 123 | } |
| 124 | |
| 125 | public void unregister() { |
| 126 | if (DBG) log("Unregistering NetworkFactory"); |
| 127 | if (mMessenger != null) { |
| 128 | ConnectivityManager.from(mContext).unregisterNetworkFactory(mMessenger); |
| 129 | mMessenger = null; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | @Override |
| 134 | public void handleMessage(Message msg) { |
| 135 | switch (msg.what) { |
| 136 | case CMD_REQUEST_NETWORK: { |
| 137 | handleAddRequest((NetworkRequest)msg.obj, msg.arg1); |
| 138 | break; |
| 139 | } |
| 140 | case CMD_CANCEL_REQUEST: { |
| 141 | handleRemoveRequest((NetworkRequest) msg.obj); |
| 142 | break; |
| 143 | } |
| 144 | case CMD_SET_SCORE: { |
| 145 | handleSetScore(msg.arg1); |
| 146 | break; |
| 147 | } |
| 148 | case CMD_SET_FILTER: { |
| 149 | handleSetFilter((NetworkCapabilities) msg.obj); |
| 150 | break; |
| 151 | } |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | private class NetworkRequestInfo { |
| 156 | public final NetworkRequest request; |
| 157 | public int score; |
| 158 | public boolean requested; // do we have a request outstanding, limited by score |
| 159 | |
| 160 | public NetworkRequestInfo(NetworkRequest request, int score) { |
| 161 | this.request = request; |
| 162 | this.score = score; |
| 163 | this.requested = false; |
| 164 | } |
Robert Greenwalt | 3d68dee | 2015-06-10 20:25:14 -0700 | [diff] [blame] | 165 | |
| 166 | @Override |
| 167 | public String toString() { |
| 168 | return "{" + request + ", score=" + score + ", requested=" + requested + "}"; |
| 169 | } |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 170 | } |
| 171 | |
Lorenzo Colitti | ffa390b | 2015-08-08 01:55:44 +0900 | [diff] [blame] | 172 | @VisibleForTesting |
| 173 | protected void handleAddRequest(NetworkRequest request, int score) { |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 174 | NetworkRequestInfo n = mNetworkRequests.get(request.requestId); |
| 175 | if (n == null) { |
Robert Greenwalt | fc0c689 | 2014-08-27 14:34:02 -0700 | [diff] [blame] | 176 | if (DBG) log("got request " + request + " with score " + score); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 177 | n = new NetworkRequestInfo(request, score); |
| 178 | mNetworkRequests.put(n.request.requestId, n); |
| 179 | } else { |
Robert Greenwalt | fc0c689 | 2014-08-27 14:34:02 -0700 | [diff] [blame] | 180 | if (VDBG) log("new score " + score + " for exisiting request " + request); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 181 | n.score = score; |
| 182 | } |
Robert Greenwalt | fc0c689 | 2014-08-27 14:34:02 -0700 | [diff] [blame] | 183 | if (VDBG) log(" my score=" + mScore + ", my filter=" + mCapabilityFilter); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 184 | |
| 185 | evalRequest(n); |
| 186 | } |
| 187 | |
Lorenzo Colitti | ffa390b | 2015-08-08 01:55:44 +0900 | [diff] [blame] | 188 | @VisibleForTesting |
| 189 | protected void handleRemoveRequest(NetworkRequest request) { |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 190 | NetworkRequestInfo n = mNetworkRequests.get(request.requestId); |
Robert Greenwalt | 348e98d | 2015-06-05 17:55:36 -0700 | [diff] [blame] | 191 | if (n != null) { |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 192 | mNetworkRequests.remove(request.requestId); |
Robert Greenwalt | 348e98d | 2015-06-05 17:55:36 -0700 | [diff] [blame] | 193 | if (n.requested) releaseNetworkFor(n.request); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 194 | } |
| 195 | } |
| 196 | |
| 197 | private void handleSetScore(int score) { |
| 198 | mScore = score; |
| 199 | evalRequests(); |
| 200 | } |
| 201 | |
| 202 | private void handleSetFilter(NetworkCapabilities netCap) { |
| 203 | mCapabilityFilter = netCap; |
| 204 | evalRequests(); |
| 205 | } |
| 206 | |
| 207 | /** |
| 208 | * Overridable function to provide complex filtering. |
| 209 | * Called for every request every time a new NetworkRequest is seen |
| 210 | * and whenever the filterScore or filterNetworkCapabilities change. |
| 211 | * |
| 212 | * acceptRequest can be overriden to provide complex filter behavior |
| 213 | * for the incoming requests |
| 214 | * |
| 215 | * For output, this class will call {@link #needNetworkFor} and |
| 216 | * {@link #releaseNetworkFor} for every request that passes the filters. |
| 217 | * If you don't need to see every request, you can leave the base |
| 218 | * implementations of those two functions and instead override |
| 219 | * {@link #startNetwork} and {@link #stopNetwork}. |
| 220 | * |
| 221 | * If you want to see every score fluctuation on every request, set |
| 222 | * your score filter to a very high number and watch {@link #needNetworkFor}. |
| 223 | * |
| 224 | * @return {@code true} to accept the request. |
| 225 | */ |
| 226 | public boolean acceptRequest(NetworkRequest request, int score) { |
| 227 | return true; |
| 228 | } |
| 229 | |
| 230 | private void evalRequest(NetworkRequestInfo n) { |
Robert Greenwalt | 2ffe412 | 2014-12-12 12:22:31 -0800 | [diff] [blame] | 231 | if (VDBG) log("evalRequest"); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 232 | if (n.requested == false && n.score < mScore && |
| 233 | n.request.networkCapabilities.satisfiedByNetworkCapabilities( |
| 234 | mCapabilityFilter) && acceptRequest(n.request, n.score)) { |
Robert Greenwalt | 2ffe412 | 2014-12-12 12:22:31 -0800 | [diff] [blame] | 235 | if (VDBG) log(" needNetworkFor"); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 236 | needNetworkFor(n.request, n.score); |
| 237 | n.requested = true; |
| 238 | } else if (n.requested == true && |
| 239 | (n.score > mScore || n.request.networkCapabilities.satisfiedByNetworkCapabilities( |
| 240 | mCapabilityFilter) == false || acceptRequest(n.request, n.score) == false)) { |
Robert Greenwalt | 2ffe412 | 2014-12-12 12:22:31 -0800 | [diff] [blame] | 241 | if (VDBG) log(" releaseNetworkFor"); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 242 | releaseNetworkFor(n.request); |
| 243 | n.requested = false; |
Robert Greenwalt | 2ffe412 | 2014-12-12 12:22:31 -0800 | [diff] [blame] | 244 | } else { |
| 245 | if (VDBG) log(" done"); |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 246 | } |
| 247 | } |
| 248 | |
| 249 | private void evalRequests() { |
| 250 | for (int i = 0; i < mNetworkRequests.size(); i++) { |
| 251 | NetworkRequestInfo n = mNetworkRequests.valueAt(i); |
| 252 | |
| 253 | evalRequest(n); |
| 254 | } |
| 255 | } |
| 256 | |
| 257 | // override to do simple mode (request independent) |
| 258 | protected void startNetwork() { } |
| 259 | protected void stopNetwork() { } |
| 260 | |
| 261 | // override to do fancier stuff |
| 262 | protected void needNetworkFor(NetworkRequest networkRequest, int score) { |
| 263 | if (++mRefCount == 1) startNetwork(); |
| 264 | } |
| 265 | |
| 266 | protected void releaseNetworkFor(NetworkRequest networkRequest) { |
| 267 | if (--mRefCount == 0) stopNetwork(); |
| 268 | } |
| 269 | |
| 270 | |
| 271 | public void addNetworkRequest(NetworkRequest networkRequest, int score) { |
| 272 | sendMessage(obtainMessage(CMD_REQUEST_NETWORK, |
| 273 | new NetworkRequestInfo(networkRequest, score))); |
| 274 | } |
| 275 | |
| 276 | public void removeNetworkRequest(NetworkRequest networkRequest) { |
| 277 | sendMessage(obtainMessage(CMD_CANCEL_REQUEST, networkRequest)); |
| 278 | } |
| 279 | |
| 280 | public void setScoreFilter(int score) { |
| 281 | sendMessage(obtainMessage(CMD_SET_SCORE, score, 0)); |
| 282 | } |
| 283 | |
| 284 | public void setCapabilityFilter(NetworkCapabilities netCap) { |
| 285 | sendMessage(obtainMessage(CMD_SET_FILTER, new NetworkCapabilities(netCap))); |
| 286 | } |
| 287 | |
Robert Greenwalt | 348e98d | 2015-06-05 17:55:36 -0700 | [diff] [blame] | 288 | @VisibleForTesting |
| 289 | protected int getRequestCount() { |
| 290 | return mNetworkRequests.size(); |
| 291 | } |
| 292 | |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 293 | protected void log(String s) { |
| 294 | Log.d(LOG_TAG, s); |
| 295 | } |
Robert Greenwalt | 6b746b5 | 2014-12-10 14:17:47 -0800 | [diff] [blame] | 296 | |
Robert Greenwalt | 3d68dee | 2015-06-10 20:25:14 -0700 | [diff] [blame] | 297 | public void dump(FileDescriptor fd, PrintWriter writer, String[] args) { |
| 298 | final IndentingPrintWriter pw = new IndentingPrintWriter(writer, " "); |
| 299 | pw.println(toString()); |
| 300 | pw.increaseIndent(); |
| 301 | for (int i = 0; i < mNetworkRequests.size(); i++) { |
| 302 | pw.println(mNetworkRequests.valueAt(i)); |
| 303 | } |
| 304 | pw.decreaseIndent(); |
| 305 | } |
| 306 | |
Robert Greenwalt | 6b746b5 | 2014-12-10 14:17:47 -0800 | [diff] [blame] | 307 | @Override |
| 308 | public String toString() { |
| 309 | StringBuilder sb = new StringBuilder("{").append(LOG_TAG).append(" - ScoreFilter="). |
| 310 | append(mScore).append(", Filter=").append(mCapabilityFilter).append(", requests="). |
Robert Greenwalt | 3d68dee | 2015-06-10 20:25:14 -0700 | [diff] [blame] | 311 | append(mNetworkRequests.size()).append(", refCount=").append(mRefCount). |
| 312 | append("}"); |
Robert Greenwalt | 6b746b5 | 2014-12-10 14:17:47 -0800 | [diff] [blame] | 313 | return sb.toString(); |
| 314 | } |
Robert Greenwalt | 3192dec | 2014-05-27 13:20:24 -0700 | [diff] [blame] | 315 | } |