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/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.chromium.latency.walt;
import android.content.Context;
import android.os.Environment;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.text.DecimalFormat;
import java.util.ArrayList;
/**
* Used to log events for Android systrace
*/
class TraceLogger {
private static final Object LOCK = new Object();
private static TraceLogger instance;
private ArrayList<TraceEvent> traceEvents;
public static TraceLogger getInstance() {
synchronized (LOCK) {
if (instance == null) {
instance = new TraceLogger();
}
return instance;
}
}
private TraceLogger() {
traceEvents = new ArrayList<>();
}
public synchronized void log(long startTimeMicros, long finishTimeMicros, String title, String description) {
traceEvents.add(new TraceEvent(startTimeMicros, finishTimeMicros, title, description));
}
public String getLogText() {
DecimalFormat df = new DecimalFormat(".000000");
StringBuilder sb = new StringBuilder();
int pid = android.os.Process.myPid();
for (TraceEvent e : traceEvents) {
sb.append(String.format(
"WALTThread-1234 (%d) [000] ...1 %s: tracing_mark_write: B|%d|%s|description=%s|WALT\n",
pid, df.format(e.startTimeMicros / 1e6), pid, e.title, e.description));
sb.append(String.format(
"WALTThread-1234 (%d) [000] ...1 %s: tracing_mark_write: E|%d|%s||WALT\n",
pid, df.format(e.finishTimeMicros / 1e6), pid, e.title));
}
return sb.toString();
}
void flush(Context context) {
SimpleLogger logger = SimpleLogger.getInstance(context);
if (!isExternalStorageWritable()) {
logger.log("ERROR: could not write systrace logs to file");
return;
}
writeSystraceLogs(context);
traceEvents.clear();
}
private void writeSystraceLogs(Context context) {
File file = new File(context.getExternalFilesDir(null), "trace.txt");
SimpleLogger logger = SimpleLogger.getInstance(context);
try {
OutputStreamWriter writer = new OutputStreamWriter(new FileOutputStream(file, true));
writer.write(getLogText());
writer.close();
logger.log(String.format("TraceLogger wrote %d events to %s",
traceEvents.size(), file.getAbsolutePath()));
} catch (IOException e) {
logger.log("ERROR: IOException writing to trace.txt");
e.printStackTrace();
}
}
private boolean isExternalStorageWritable() {
String state = Environment.getExternalStorageState();
return Environment.MEDIA_MOUNTED.equals(state);
}
private class TraceEvent {
long startTimeMicros;
long finishTimeMicros;
String title;
String description;
TraceEvent(long startTimeMicros, long finishTimeMicros, String title, String description) {
this.startTimeMicros = startTimeMicros;
this.finishTimeMicros = finishTimeMicros;
this.title = title;
this.description = description;
}
}
}
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