83 lines
2.4 KiB
Java
83 lines
2.4 KiB
Java
/*
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* Copyright (C) 2012 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.internal.util;
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import android.util.IndentingPrintWriter;
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import android.util.Slog;
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import android.util.proto.ProtoOutputStream;
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import java.util.ArrayList;
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/**
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* Helper class for logging serious issues, which also keeps a small
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* snapshot of the logged events that can be printed later, such as part
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* of a system service's dumpsys output.
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* @hide
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*/
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// Exported to Mainline modules; cannot use annotations
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// @android.ravenwood.annotation.RavenwoodKeepWholeClass
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public class LocalLog {
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private final String mTag;
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private final int mMaxLines = 20;
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private final ArrayList<String> mLines = new ArrayList<String>(mMaxLines);
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public LocalLog(String tag) {
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mTag = tag;
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}
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public void w(String msg) {
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synchronized (mLines) {
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Slog.w(mTag, msg);
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if (mLines.size() >= mMaxLines) {
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mLines.remove(0);
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}
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mLines.add(msg);
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}
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}
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public boolean dump(IndentingPrintWriter pw, String header) {
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synchronized (mLines) {
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if (mLines.size() <= 0) {
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return false;
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}
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if (header != null) {
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pw.println(header);
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pw.increaseIndent();
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}
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for (int i=0; i<mLines.size(); i++) {
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pw.println(mLines.get(i));
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}
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if (header != null) {
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pw.decreaseIndent();
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}
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return true;
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}
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}
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public void dumpDebug(ProtoOutputStream proto, long fieldId) {
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final long token = proto.start(fieldId);
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synchronized (mLines) {
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for (int i = 0; i < mLines.size(); ++i) {
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proto.write(LocalLogProto.LINES, mLines.get(i));
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}
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}
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proto.end(token);
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}
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}
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