The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2006 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.os; |
| 18 | |
Dianne Hackborn | 1ebccf5 | 2010-08-15 13:04:34 -0700 | [diff] [blame] | 19 | import android.util.TimeUtils; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 20 | |
| 21 | /** |
| 22 | * |
| 23 | * Defines a message containing a description and arbitrary data object that can be |
| 24 | * sent to a {@link Handler}. This object contains two extra int fields and an |
| 25 | * extra object field that allow you to not do allocations in many cases. |
| 26 | * |
| 27 | * <p class="note">While the constructor of Message is public, the best way to get |
| 28 | * one of these is to call {@link #obtain Message.obtain()} or one of the |
| 29 | * {@link Handler#obtainMessage Handler.obtainMessage()} methods, which will pull |
| 30 | * them from a pool of recycled objects.</p> |
| 31 | */ |
| 32 | public final class Message implements Parcelable { |
| 33 | /** |
| 34 | * User-defined message code so that the recipient can identify |
| 35 | * what this message is about. Each {@link Handler} has its own name-space |
| 36 | * for message codes, so you do not need to worry about yours conflicting |
| 37 | * with other handlers. |
| 38 | */ |
| 39 | public int what; |
| 40 | |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 41 | /** |
| 42 | * arg1 and arg2 are lower-cost alternatives to using |
| 43 | * {@link #setData(Bundle) setData()} if you only need to store a |
| 44 | * few integer values. |
| 45 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 46 | public int arg1; |
| 47 | |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 48 | /** |
| 49 | * arg1 and arg2 are lower-cost alternatives to using |
| 50 | * {@link #setData(Bundle) setData()} if you only need to store a |
| 51 | * few integer values. |
| 52 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 53 | public int arg2; |
| 54 | |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 55 | /** |
| 56 | * An arbitrary object to send to the recipient. When using |
| 57 | * {@link Messenger} to send the message across processes this can only |
| 58 | * be non-null if it contains a Parcelable of a framework class (not one |
| 59 | * implemented by the application). For other data transfer use |
| 60 | * {@link #setData}. |
| 61 | * |
| 62 | * <p>Note that Parcelable objects here are not supported prior to |
| 63 | * the {@link android.os.Build.VERSION_CODES#FROYO} release. |
| 64 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 65 | public Object obj; |
| 66 | |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 67 | /** |
| 68 | * Optional Messenger where replies to this message can be sent. The |
| 69 | * semantics of exactly how this is used are up to the sender and |
| 70 | * receiver. |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 71 | */ |
| 72 | public Messenger replyTo; |
Wink Saville | a334e7c | 2010-08-24 10:56:30 -0700 | [diff] [blame] | 73 | |
Dianne Hackborn | cb3ed1d | 2014-06-27 18:37:06 -0700 | [diff] [blame] | 74 | /** |
| 75 | * Optional field indicating the uid that sent the message. This is |
| 76 | * only valid for messages posted by a {@link Messenger}; otherwise, |
| 77 | * it will be -1. |
| 78 | */ |
| 79 | public int sendingUid = -1; |
| 80 | |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 81 | /** If set message is in use. |
| 82 | * This flag is set when the message is enqueued and remains set while it |
| 83 | * is delivered and afterwards when it is recycled. The flag is only cleared |
| 84 | * when a new message is created or obtained since that is the only time that |
| 85 | * applications are allowed to modify the contents of the message. |
| 86 | * |
| 87 | * It is an error to attempt to enqueue or recycle a message that is already in use. |
| 88 | */ |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 89 | /*package*/ static final int FLAG_IN_USE = 1 << 0; |
Wink Saville | a334e7c | 2010-08-24 10:56:30 -0700 | [diff] [blame] | 90 | |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 91 | /** If set message is asynchronous */ |
| 92 | /*package*/ static final int FLAG_ASYNCHRONOUS = 1 << 1; |
Wink Saville | a334e7c | 2010-08-24 10:56:30 -0700 | [diff] [blame] | 93 | |
| 94 | /** Flags to clear in the copyFrom method */ |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 95 | /*package*/ static final int FLAGS_TO_CLEAR_ON_COPY_FROM = FLAG_IN_USE; |
Wink Saville | a334e7c | 2010-08-24 10:56:30 -0700 | [diff] [blame] | 96 | |
| 97 | /*package*/ int flags; |
| 98 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 99 | /*package*/ long when; |
| 100 | |
| 101 | /*package*/ Bundle data; |
| 102 | |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 103 | /*package*/ Handler target; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 104 | |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 105 | /*package*/ Runnable callback; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 106 | |
| 107 | // sometimes we store linked lists of these things |
| 108 | /*package*/ Message next; |
| 109 | |
Brad Fitzpatrick | 2405c278 | 2011-01-25 14:48:21 -0800 | [diff] [blame] | 110 | private static final Object sPoolSync = new Object(); |
| 111 | private static Message sPool; |
| 112 | private static int sPoolSize = 0; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 113 | |
Romain Guy | a2ad656 | 2012-05-06 16:10:34 -0700 | [diff] [blame] | 114 | private static final int MAX_POOL_SIZE = 50; |
| 115 | |
Dianne Hackborn | 7895bc2 | 2014-09-05 15:09:03 -0700 | [diff] [blame] | 116 | private static boolean gCheckRecycle = true; |
| 117 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 118 | /** |
| 119 | * Return a new Message instance from the global pool. Allows us to |
| 120 | * avoid allocating new objects in many cases. |
| 121 | */ |
| 122 | public static Message obtain() { |
Brad Fitzpatrick | 2405c278 | 2011-01-25 14:48:21 -0800 | [diff] [blame] | 123 | synchronized (sPoolSync) { |
| 124 | if (sPool != null) { |
| 125 | Message m = sPool; |
| 126 | sPool = m.next; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 127 | m.next = null; |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 128 | m.flags = 0; // clear in-use flag |
Brad Fitzpatrick | 2405c278 | 2011-01-25 14:48:21 -0800 | [diff] [blame] | 129 | sPoolSize--; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 130 | return m; |
| 131 | } |
| 132 | } |
| 133 | return new Message(); |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Same as {@link #obtain()}, but copies the values of an existing |
| 138 | * message (including its target) into the new one. |
| 139 | * @param orig Original message to copy. |
| 140 | * @return A Message object from the global pool. |
| 141 | */ |
| 142 | public static Message obtain(Message orig) { |
| 143 | Message m = obtain(); |
| 144 | m.what = orig.what; |
| 145 | m.arg1 = orig.arg1; |
| 146 | m.arg2 = orig.arg2; |
| 147 | m.obj = orig.obj; |
| 148 | m.replyTo = orig.replyTo; |
Dianne Hackborn | cb3ed1d | 2014-06-27 18:37:06 -0700 | [diff] [blame] | 149 | m.sendingUid = orig.sendingUid; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 150 | if (orig.data != null) { |
| 151 | m.data = new Bundle(orig.data); |
| 152 | } |
| 153 | m.target = orig.target; |
| 154 | m.callback = orig.callback; |
| 155 | |
| 156 | return m; |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Same as {@link #obtain()}, but sets the value for the <em>target</em> member on the Message returned. |
| 161 | * @param h Handler to assign to the returned Message object's <em>target</em> member. |
| 162 | * @return A Message object from the global pool. |
| 163 | */ |
| 164 | public static Message obtain(Handler h) { |
| 165 | Message m = obtain(); |
| 166 | m.target = h; |
| 167 | |
| 168 | return m; |
| 169 | } |
| 170 | |
| 171 | /** |
| 172 | * Same as {@link #obtain(Handler)}, but assigns a callback Runnable on |
| 173 | * the Message that is returned. |
| 174 | * @param h Handler to assign to the returned Message object's <em>target</em> member. |
| 175 | * @param callback Runnable that will execute when the message is handled. |
| 176 | * @return A Message object from the global pool. |
| 177 | */ |
| 178 | public static Message obtain(Handler h, Runnable callback) { |
| 179 | Message m = obtain(); |
| 180 | m.target = h; |
| 181 | m.callback = callback; |
| 182 | |
| 183 | return m; |
| 184 | } |
| 185 | |
| 186 | /** |
| 187 | * Same as {@link #obtain()}, but sets the values for both <em>target</em> and |
| 188 | * <em>what</em> members on the Message. |
| 189 | * @param h Value to assign to the <em>target</em> member. |
| 190 | * @param what Value to assign to the <em>what</em> member. |
| 191 | * @return A Message object from the global pool. |
| 192 | */ |
| 193 | public static Message obtain(Handler h, int what) { |
| 194 | Message m = obtain(); |
| 195 | m.target = h; |
| 196 | m.what = what; |
| 197 | |
| 198 | return m; |
| 199 | } |
| 200 | |
| 201 | /** |
| 202 | * Same as {@link #obtain()}, but sets the values of the <em>target</em>, <em>what</em>, and <em>obj</em> |
| 203 | * members. |
| 204 | * @param h The <em>target</em> value to set. |
| 205 | * @param what The <em>what</em> value to set. |
| 206 | * @param obj The <em>object</em> method to set. |
| 207 | * @return A Message object from the global pool. |
| 208 | */ |
| 209 | public static Message obtain(Handler h, int what, Object obj) { |
| 210 | Message m = obtain(); |
| 211 | m.target = h; |
| 212 | m.what = what; |
| 213 | m.obj = obj; |
| 214 | |
| 215 | return m; |
| 216 | } |
| 217 | |
| 218 | /** |
| 219 | * Same as {@link #obtain()}, but sets the values of the <em>target</em>, <em>what</em>, |
| 220 | * <em>arg1</em>, and <em>arg2</em> members. |
| 221 | * |
| 222 | * @param h The <em>target</em> value to set. |
| 223 | * @param what The <em>what</em> value to set. |
| 224 | * @param arg1 The <em>arg1</em> value to set. |
| 225 | * @param arg2 The <em>arg2</em> value to set. |
| 226 | * @return A Message object from the global pool. |
| 227 | */ |
| 228 | public static Message obtain(Handler h, int what, int arg1, int arg2) { |
| 229 | Message m = obtain(); |
| 230 | m.target = h; |
| 231 | m.what = what; |
| 232 | m.arg1 = arg1; |
| 233 | m.arg2 = arg2; |
| 234 | |
| 235 | return m; |
| 236 | } |
| 237 | |
| 238 | /** |
| 239 | * Same as {@link #obtain()}, but sets the values of the <em>target</em>, <em>what</em>, |
| 240 | * <em>arg1</em>, <em>arg2</em>, and <em>obj</em> members. |
| 241 | * |
| 242 | * @param h The <em>target</em> value to set. |
| 243 | * @param what The <em>what</em> value to set. |
| 244 | * @param arg1 The <em>arg1</em> value to set. |
| 245 | * @param arg2 The <em>arg2</em> value to set. |
| 246 | * @param obj The <em>obj</em> value to set. |
| 247 | * @return A Message object from the global pool. |
| 248 | */ |
| 249 | public static Message obtain(Handler h, int what, |
| 250 | int arg1, int arg2, Object obj) { |
| 251 | Message m = obtain(); |
| 252 | m.target = h; |
| 253 | m.what = what; |
| 254 | m.arg1 = arg1; |
| 255 | m.arg2 = arg2; |
| 256 | m.obj = obj; |
| 257 | |
| 258 | return m; |
| 259 | } |
| 260 | |
Dianne Hackborn | 7895bc2 | 2014-09-05 15:09:03 -0700 | [diff] [blame] | 261 | /** @hide */ |
| 262 | public static void updateCheckRecycle(int targetSdkVersion) { |
Dianne Hackborn | 955d8d6 | 2014-10-07 20:17:19 -0700 | [diff] [blame] | 263 | if (targetSdkVersion < Build.VERSION_CODES.LOLLIPOP) { |
Dianne Hackborn | 7895bc2 | 2014-09-05 15:09:03 -0700 | [diff] [blame] | 264 | gCheckRecycle = false; |
| 265 | } |
| 266 | } |
| 267 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 268 | /** |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 269 | * Return a Message instance to the global pool. |
| 270 | * <p> |
| 271 | * You MUST NOT touch the Message after calling this function because it has |
| 272 | * effectively been freed. It is an error to recycle a message that is currently |
| 273 | * enqueued or that is in the process of being delivered to a Handler. |
| 274 | * </p> |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 275 | */ |
| 276 | public void recycle() { |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 277 | if (isInUse()) { |
Dianne Hackborn | 7895bc2 | 2014-09-05 15:09:03 -0700 | [diff] [blame] | 278 | if (gCheckRecycle) { |
| 279 | throw new IllegalStateException("This message cannot be recycled because it " |
| 280 | + "is still in use."); |
| 281 | } |
| 282 | return; |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 283 | } |
| 284 | recycleUnchecked(); |
| 285 | } |
| 286 | |
| 287 | /** |
| 288 | * Recycles a Message that may be in-use. |
| 289 | * Used internally by the MessageQueue and Looper when disposing of queued Messages. |
| 290 | */ |
| 291 | void recycleUnchecked() { |
| 292 | // Mark the message as in use while it remains in the recycled object pool. |
| 293 | // Clear out all other details. |
| 294 | flags = FLAG_IN_USE; |
| 295 | what = 0; |
| 296 | arg1 = 0; |
| 297 | arg2 = 0; |
| 298 | obj = null; |
| 299 | replyTo = null; |
Dianne Hackborn | cb3ed1d | 2014-06-27 18:37:06 -0700 | [diff] [blame] | 300 | sendingUid = -1; |
Jeff Brown | 9867ed7 | 2014-02-28 14:00:57 -0800 | [diff] [blame] | 301 | when = 0; |
| 302 | target = null; |
| 303 | callback = null; |
| 304 | data = null; |
Jeff Brown | fc9ff4c | 2011-06-10 17:56:08 -0700 | [diff] [blame] | 305 | |
Brad Fitzpatrick | 2405c278 | 2011-01-25 14:48:21 -0800 | [diff] [blame] | 306 | synchronized (sPoolSync) { |
| 307 | if (sPoolSize < MAX_POOL_SIZE) { |
Brad Fitzpatrick | 2405c278 | 2011-01-25 14:48:21 -0800 | [diff] [blame] | 308 | next = sPool; |
| 309 | sPool = this; |
| 310 | sPoolSize++; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 311 | } |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | /** |
| 316 | * Make this message like o. Performs a shallow copy of the data field. |
| 317 | * Does not copy the linked list fields, nor the timestamp or |
| 318 | * target/callback of the original message. |
| 319 | */ |
| 320 | public void copyFrom(Message o) { |
Wink Saville | a334e7c | 2010-08-24 10:56:30 -0700 | [diff] [blame] | 321 | this.flags = o.flags & ~FLAGS_TO_CLEAR_ON_COPY_FROM; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 322 | this.what = o.what; |
| 323 | this.arg1 = o.arg1; |
| 324 | this.arg2 = o.arg2; |
| 325 | this.obj = o.obj; |
| 326 | this.replyTo = o.replyTo; |
Dianne Hackborn | cb3ed1d | 2014-06-27 18:37:06 -0700 | [diff] [blame] | 327 | this.sendingUid = o.sendingUid; |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 328 | |
| 329 | if (o.data != null) { |
| 330 | this.data = (Bundle) o.data.clone(); |
| 331 | } else { |
| 332 | this.data = null; |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | /** |
| 337 | * Return the targeted delivery time of this message, in milliseconds. |
| 338 | */ |
| 339 | public long getWhen() { |
| 340 | return when; |
| 341 | } |
| 342 | |
| 343 | public void setTarget(Handler target) { |
| 344 | this.target = target; |
| 345 | } |
| 346 | |
| 347 | /** |
| 348 | * Retrieve the a {@link android.os.Handler Handler} implementation that |
| 349 | * will receive this message. The object must implement |
| 350 | * {@link android.os.Handler#handleMessage(android.os.Message) |
| 351 | * Handler.handleMessage()}. Each Handler has its own name-space for |
| 352 | * message codes, so you do not need to |
| 353 | * worry about yours conflicting with other handlers. |
| 354 | */ |
| 355 | public Handler getTarget() { |
| 356 | return target; |
| 357 | } |
| 358 | |
| 359 | /** |
| 360 | * Retrieve callback object that will execute when this message is handled. |
| 361 | * This object must implement Runnable. This is called by |
| 362 | * the <em>target</em> {@link Handler} that is receiving this Message to |
| 363 | * dispatch it. If |
| 364 | * not set, the message will be dispatched to the receiving Handler's |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 365 | * {@link Handler#handleMessage(Message Handler.handleMessage())}. |
| 366 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 367 | public Runnable getCallback() { |
| 368 | return callback; |
| 369 | } |
| 370 | |
| 371 | /** |
| 372 | * Obtains a Bundle of arbitrary data associated with this |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 373 | * event, lazily creating it if necessary. Set this value by calling |
| 374 | * {@link #setData(Bundle)}. Note that when transferring data across |
| 375 | * processes via {@link Messenger}, you will need to set your ClassLoader |
| 376 | * on the Bundle via {@link Bundle#setClassLoader(ClassLoader) |
| 377 | * Bundle.setClassLoader()} so that it can instantiate your objects when |
| 378 | * you retrieve them. |
| 379 | * @see #peekData() |
| 380 | * @see #setData(Bundle) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 381 | */ |
| 382 | public Bundle getData() { |
| 383 | if (data == null) { |
| 384 | data = new Bundle(); |
| 385 | } |
| 386 | |
| 387 | return data; |
| 388 | } |
| 389 | |
| 390 | /** |
| 391 | * Like getData(), but does not lazily create the Bundle. A null |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 392 | * is returned if the Bundle does not already exist. See |
| 393 | * {@link #getData} for further information on this. |
| 394 | * @see #getData() |
| 395 | * @see #setData(Bundle) |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 396 | */ |
| 397 | public Bundle peekData() { |
| 398 | return data; |
| 399 | } |
| 400 | |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 401 | /** |
Denver Coneybeare | d0eb553 | 2014-06-18 15:45:14 -0400 | [diff] [blame] | 402 | * Sets a Bundle of arbitrary data values. Use arg1 and arg2 members |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 403 | * as a lower cost way to send a few simple integer values, if you can. |
| 404 | * @see #getData() |
| 405 | * @see #peekData() |
| 406 | */ |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 407 | public void setData(Bundle data) { |
| 408 | this.data = data; |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * Sends this Message to the Handler specified by {@link #getTarget}. |
| 413 | * Throws a null pointer exception if this field has not been set. |
| 414 | */ |
| 415 | public void sendToTarget() { |
| 416 | target.sendMessage(this); |
| 417 | } |
| 418 | |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 419 | /** |
Jeff Brown | 9840c07 | 2014-11-11 20:21:21 -0800 | [diff] [blame] | 420 | * Returns true if the message is asynchronous, meaning that it is not |
| 421 | * subject to {@link Looper} synchronization barriers. |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 422 | * |
| 423 | * @return True if the message is asynchronous. |
| 424 | * |
| 425 | * @see #setAsynchronous(boolean) |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 426 | */ |
| 427 | public boolean isAsynchronous() { |
| 428 | return (flags & FLAG_ASYNCHRONOUS) != 0; |
| 429 | } |
| 430 | |
| 431 | /** |
Jeff Brown | 9840c07 | 2014-11-11 20:21:21 -0800 | [diff] [blame] | 432 | * Sets whether the message is asynchronous, meaning that it is not |
| 433 | * subject to {@link Looper} synchronization barriers. |
| 434 | * <p> |
| 435 | * Certain operations, such as view invalidation, may introduce synchronization |
| 436 | * barriers into the {@link Looper}'s message queue to prevent subsequent messages |
| 437 | * from being delivered until some condition is met. In the case of view invalidation, |
| 438 | * messages which are posted after a call to {@link android.view.View#invalidate} |
| 439 | * are suspended by means of a synchronization barrier until the next frame is |
| 440 | * ready to be drawn. The synchronization barrier ensures that the invalidation |
| 441 | * request is completely handled before resuming. |
| 442 | * </p><p> |
| 443 | * Asynchronous messages are exempt from synchronization barriers. They typically |
| 444 | * represent interrupts, input events, and other signals that must be handled independently |
| 445 | * even while other work has been suspended. |
| 446 | * </p><p> |
| 447 | * Note that asynchronous messages may be delivered out of order with respect to |
| 448 | * synchronous messages although they are always delivered in order among themselves. |
| 449 | * If the relative order of these messages matters then they probably should not be |
| 450 | * asynchronous in the first place. Use with caution. |
| 451 | * </p> |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 452 | * |
| 453 | * @param async True if the message is asynchronous. |
| 454 | * |
| 455 | * @see #isAsynchronous() |
Jeff Brown | e799cb7 | 2012-02-14 11:53:33 -0800 | [diff] [blame] | 456 | */ |
| 457 | public void setAsynchronous(boolean async) { |
| 458 | if (async) { |
| 459 | flags |= FLAG_ASYNCHRONOUS; |
| 460 | } else { |
| 461 | flags &= ~FLAG_ASYNCHRONOUS; |
| 462 | } |
| 463 | } |
| 464 | |
Wink Saville | a334e7c | 2010-08-24 10:56:30 -0700 | [diff] [blame] | 465 | /*package*/ boolean isInUse() { |
| 466 | return ((flags & FLAG_IN_USE) == FLAG_IN_USE); |
| 467 | } |
| 468 | |
| 469 | /*package*/ void markInUse() { |
| 470 | flags |= FLAG_IN_USE; |
| 471 | } |
| 472 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 473 | /** Constructor (but the preferred way to get a Message is to call {@link #obtain() Message.obtain()}). |
| 474 | */ |
| 475 | public Message() { |
| 476 | } |
| 477 | |
Jeff Brown | 5182c78 | 2013-10-15 20:31:52 -0700 | [diff] [blame] | 478 | @Override |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 479 | public String toString() { |
Dianne Hackborn | 1ebccf5 | 2010-08-15 13:04:34 -0700 | [diff] [blame] | 480 | return toString(SystemClock.uptimeMillis()); |
| 481 | } |
| 482 | |
| 483 | String toString(long now) { |
Jeff Brown | 5182c78 | 2013-10-15 20:31:52 -0700 | [diff] [blame] | 484 | StringBuilder b = new StringBuilder(); |
| 485 | b.append("{ when="); |
| 486 | TimeUtils.formatDuration(when - now, b); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 487 | |
Jeff Brown | 5182c78 | 2013-10-15 20:31:52 -0700 | [diff] [blame] | 488 | if (target != null) { |
| 489 | if (callback != null) { |
| 490 | b.append(" callback="); |
| 491 | b.append(callback.getClass().getName()); |
| 492 | } else { |
| 493 | b.append(" what="); |
| 494 | b.append(what); |
| 495 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 496 | |
Jeff Brown | 5182c78 | 2013-10-15 20:31:52 -0700 | [diff] [blame] | 497 | if (arg1 != 0) { |
| 498 | b.append(" arg1="); |
| 499 | b.append(arg1); |
| 500 | } |
| 501 | |
| 502 | if (arg2 != 0) { |
| 503 | b.append(" arg2="); |
| 504 | b.append(arg2); |
| 505 | } |
| 506 | |
| 507 | if (obj != null) { |
| 508 | b.append(" obj="); |
| 509 | b.append(obj); |
| 510 | } |
| 511 | |
| 512 | b.append(" target="); |
| 513 | b.append(target.getClass().getName()); |
| 514 | } else { |
| 515 | b.append(" barrier="); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 516 | b.append(arg1); |
| 517 | } |
| 518 | |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 519 | b.append(" }"); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 520 | return b.toString(); |
| 521 | } |
| 522 | |
| 523 | public static final Parcelable.Creator<Message> CREATOR |
| 524 | = new Parcelable.Creator<Message>() { |
| 525 | public Message createFromParcel(Parcel source) { |
| 526 | Message msg = Message.obtain(); |
| 527 | msg.readFromParcel(source); |
| 528 | return msg; |
| 529 | } |
| 530 | |
| 531 | public Message[] newArray(int size) { |
| 532 | return new Message[size]; |
| 533 | } |
| 534 | }; |
| 535 | |
| 536 | public int describeContents() { |
| 537 | return 0; |
| 538 | } |
| 539 | |
| 540 | public void writeToParcel(Parcel dest, int flags) { |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 541 | if (callback != null) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 542 | throw new RuntimeException( |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 543 | "Can't marshal callbacks across processes."); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 544 | } |
| 545 | dest.writeInt(what); |
| 546 | dest.writeInt(arg1); |
| 547 | dest.writeInt(arg2); |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 548 | if (obj != null) { |
| 549 | try { |
| 550 | Parcelable p = (Parcelable)obj; |
| 551 | dest.writeInt(1); |
| 552 | dest.writeParcelable(p, flags); |
| 553 | } catch (ClassCastException e) { |
| 554 | throw new RuntimeException( |
| 555 | "Can't marshal non-Parcelable objects across processes."); |
| 556 | } |
| 557 | } else { |
| 558 | dest.writeInt(0); |
| 559 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 560 | dest.writeLong(when); |
| 561 | dest.writeBundle(data); |
| 562 | Messenger.writeMessengerOrNullToParcel(replyTo, dest); |
Dianne Hackborn | cb3ed1d | 2014-06-27 18:37:06 -0700 | [diff] [blame] | 563 | dest.writeInt(sendingUid); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 564 | } |
| 565 | |
Romain Guy | 8f3b8e3 | 2012-03-27 16:33:45 -0700 | [diff] [blame] | 566 | private void readFromParcel(Parcel source) { |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 567 | what = source.readInt(); |
| 568 | arg1 = source.readInt(); |
| 569 | arg2 = source.readInt(); |
Dianne Hackborn | 75288fa | 2010-02-16 18:01:18 -0800 | [diff] [blame] | 570 | if (source.readInt() != 0) { |
| 571 | obj = source.readParcelable(getClass().getClassLoader()); |
| 572 | } |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 573 | when = source.readLong(); |
| 574 | data = source.readBundle(); |
| 575 | replyTo = Messenger.readMessengerOrNullFromParcel(source); |
Dianne Hackborn | cb3ed1d | 2014-06-27 18:37:06 -0700 | [diff] [blame] | 576 | sendingUid = source.readInt(); |
The Android Open Source Project | 9066cfe | 2009-03-03 19:31:44 -0800 | [diff] [blame] | 577 | } |
| 578 | } |