Brad Ebinger | 4fb372f | 2016-10-05 15:47:28 -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 | |
| 17 | package android.telecom.Logging; |
| 18 | |
| 19 | import android.telecom.Log; |
| 20 | |
| 21 | /** |
| 22 | * Encapsulates session logging in a Runnable to reduce code duplication when continuing subsessions |
| 23 | * in a handler/thread. |
| 24 | * @hide |
| 25 | */ |
| 26 | public abstract class Runnable { |
| 27 | |
| 28 | private Session mSubsession; |
| 29 | private final String mSubsessionName; |
| 30 | private final Object mLock = new Object(); |
| 31 | private final java.lang.Runnable mRunnable = new java.lang.Runnable() { |
| 32 | @Override |
| 33 | public void run() { |
| 34 | synchronized (mLock) { |
| 35 | try { |
| 36 | Log.continueSession(mSubsession, mSubsessionName); |
| 37 | loggedRun(); |
| 38 | } finally { |
| 39 | if (mSubsession != null) { |
| 40 | Log.endSession(); |
| 41 | mSubsession = null; |
| 42 | } |
| 43 | } |
| 44 | } |
| 45 | } |
| 46 | }; |
| 47 | |
| 48 | public Runnable(String subsessionName) { |
| 49 | mSubsessionName = subsessionName; |
| 50 | } |
| 51 | |
| 52 | /** |
| 53 | * Return the runnable that will be canceled in the handler queue. |
| 54 | * @return Runnable object to cancel. |
| 55 | */ |
| 56 | public final java.lang.Runnable getRunnableToCancel() { |
| 57 | return mRunnable; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Creates a Runnable and a logging subsession that can be used in a handler/thread. Be sure to |
| 62 | * call cancel() if this session is never going to be run (removed from a handler queue, for |
| 63 | * for example). |
| 64 | * @return A Java Runnable that can be used in a handler queue or thread. |
| 65 | */ |
| 66 | public java.lang.Runnable prepare() { |
| 67 | cancel(); |
| 68 | mSubsession = Log.createSubsession(); |
| 69 | return mRunnable; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * This method is used to clean up the active session if the Runnable gets removed from a |
| 74 | * handler and is never run. |
| 75 | */ |
| 76 | public void cancel() { |
| 77 | synchronized (mLock) { |
| 78 | Log.cancelSubsession(mSubsession); |
| 79 | mSubsession = null; |
| 80 | } |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * The method that will be run in the handler/thread. |
| 85 | */ |
| 86 | abstract public void loggedRun(); |
| 87 | |
| 88 | } |