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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 package org.chromium.chrome.browser.util; |
| 6 |
| 7 import org.chromium.base.VisibleForTesting; |
| 8 import org.chromium.base.annotations.SuppressFBWarnings; |
| 9 |
| 10 /** |
| 11 * NonThreadSafe is a helper class used to help verify that methods of a |
| 12 * class are called from the same thread. |
| 13 */ |
| 14 public class NonThreadSafe { |
| 15 private Long mThreadId = null; |
| 16 |
| 17 public NonThreadSafe() { |
| 18 ensureThreadIdAssigned(); |
| 19 } |
| 20 |
| 21 /** |
| 22 * Changes the thread that is checked for in CalledOnValidThread. This may |
| 23 * be useful when an object may be created on one thread and then used |
| 24 * exclusively on another thread. |
| 25 */ |
| 26 @SuppressFBWarnings("CHROMIUM_SYNCHRONIZED_METHOD") |
| 27 @VisibleForTesting |
| 28 public synchronized void detachFromThread() { |
| 29 mThreadId = null; |
| 30 } |
| 31 |
| 32 /** |
| 33 * Checks if the method is called on the valid thread. |
| 34 * Assigns the current thread if no thread was assigned. |
| 35 */ |
| 36 @SuppressFBWarnings("CHROMIUM_SYNCHRONIZED_METHOD") |
| 37 public synchronized boolean calledOnValidThread() { |
| 38 ensureThreadIdAssigned(); |
| 39 return mThreadId.equals(Thread.currentThread().getId()); |
| 40 } |
| 41 |
| 42 private void ensureThreadIdAssigned() { |
| 43 if (mThreadId == null) mThreadId = Thread.currentThread().getId(); |
| 44 } |
| 45 } |
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