Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -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.util; |
| 18 | |
Mathew Inwood | 4eb56ab | 2018-08-14 17:24:32 +0100 | [diff] [blame] | 19 | import android.annotation.UnsupportedAppUsage; |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 20 | import java.io.FileDescriptor; |
| 21 | import java.io.PrintWriter; |
Narayan Kamath | 6229d99 | 2017-06-09 13:35:48 +0100 | [diff] [blame] | 22 | import java.time.LocalDateTime; |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 23 | import java.util.ArrayDeque; |
Narayan Kamath | 6229d99 | 2017-06-09 13:35:48 +0100 | [diff] [blame] | 24 | import java.util.Deque; |
| 25 | import java.util.Iterator; |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 26 | |
| 27 | /** |
| 28 | * @hide |
| 29 | */ |
| 30 | public final class LocalLog { |
| 31 | |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 32 | private final Deque<String> mLog; |
| 33 | private final int mMaxLines; |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 34 | |
Mathew Inwood | 4eb56ab | 2018-08-14 17:24:32 +0100 | [diff] [blame] | 35 | @UnsupportedAppUsage |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 36 | public LocalLog(int maxLines) { |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 37 | mMaxLines = Math.max(0, maxLines); |
| 38 | mLog = new ArrayDeque<>(mMaxLines); |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 39 | } |
| 40 | |
Mathew Inwood | 4eb56ab | 2018-08-14 17:24:32 +0100 | [diff] [blame] | 41 | @UnsupportedAppUsage |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 42 | public void log(String msg) { |
| 43 | if (mMaxLines <= 0) { |
| 44 | return; |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 45 | } |
Narayan Kamath | 6229d99 | 2017-06-09 13:35:48 +0100 | [diff] [blame] | 46 | append(String.format("%s - %s", LocalDateTime.now(), msg)); |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 47 | } |
| 48 | |
| 49 | private synchronized void append(String logLine) { |
| 50 | while (mLog.size() >= mMaxLines) { |
| 51 | mLog.remove(); |
| 52 | } |
| 53 | mLog.add(logLine); |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 54 | } |
| 55 | |
Mathew Inwood | 4eb56ab | 2018-08-14 17:24:32 +0100 | [diff] [blame] | 56 | @UnsupportedAppUsage |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 57 | public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 58 | Iterator<String> itr = mLog.iterator(); |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 59 | while (itr.hasNext()) { |
| 60 | pw.println(itr.next()); |
| 61 | } |
| 62 | } |
Robert Greenwalt | 22b4c6a | 2015-06-23 15:03:33 -0700 | [diff] [blame] | 63 | |
Erik Kline | 7523eb3 | 2015-07-09 18:24:03 +0900 | [diff] [blame] | 64 | public synchronized void reverseDump(FileDescriptor fd, PrintWriter pw, String[] args) { |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 65 | Iterator<String> itr = mLog.descendingIterator(); |
| 66 | while (itr.hasNext()) { |
| 67 | pw.println(itr.next()); |
Erik Kline | 7523eb3 | 2015-07-09 18:24:03 +0900 | [diff] [blame] | 68 | } |
| 69 | } |
| 70 | |
Robert Greenwalt | 22b4c6a | 2015-06-23 15:03:33 -0700 | [diff] [blame] | 71 | public static class ReadOnlyLocalLog { |
| 72 | private final LocalLog mLog; |
| 73 | ReadOnlyLocalLog(LocalLog log) { |
| 74 | mLog = log; |
| 75 | } |
Mathew Inwood | 4eb56ab | 2018-08-14 17:24:32 +0100 | [diff] [blame] | 76 | @UnsupportedAppUsage |
Robert Greenwalt | 22b4c6a | 2015-06-23 15:03:33 -0700 | [diff] [blame] | 77 | public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 78 | mLog.dump(fd, pw, args); |
| 79 | } |
Hugo Benichi | de310db | 2016-10-04 11:36:11 +0900 | [diff] [blame] | 80 | public void reverseDump(FileDescriptor fd, PrintWriter pw, String[] args) { |
| 81 | mLog.reverseDump(fd, pw, args); |
| 82 | } |
Robert Greenwalt | 22b4c6a | 2015-06-23 15:03:33 -0700 | [diff] [blame] | 83 | } |
| 84 | |
Mathew Inwood | 4eb56ab | 2018-08-14 17:24:32 +0100 | [diff] [blame] | 85 | @UnsupportedAppUsage |
Robert Greenwalt | 22b4c6a | 2015-06-23 15:03:33 -0700 | [diff] [blame] | 86 | public ReadOnlyLocalLog readOnlyLocalLog() { |
| 87 | return new ReadOnlyLocalLog(this); |
| 88 | } |
Robert Greenwalt | 470fd72 | 2012-01-18 12:51:15 -0800 | [diff] [blame] | 89 | } |