arcanechat-android/MessengerProj/src/main/java/com/b44t/messenger/FileLog.java

/*******************************************************************************
 *
 *                              Delta Chat Android
 *                        (C) 2013-2016 Nikolai Kudashov
 *                           (C) 2017 Björn Petersen
 *                    Contact: r10s@b44t.com, http://b44t.com
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation, either version 3 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see http://www.gnu.org/licenses/ .
 *
 ******************************************************************************/


package com.b44t.messenger;

import com.b44t.messenger.time.FastDateFormat;

import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.util.Locale;

public class FileLog {
    private OutputStreamWriter streamWriter = null;
    private FastDateFormat dateFormat = null;
    private DispatchQueue logQueue = null;
    private File currentFile = null;

    private static volatile FileLog Instance = null;
    public static FileLog getInstance() {
        FileLog localInstance = Instance;
        if (localInstance == null) {
            synchronized (FileLog.class) {
                localInstance = Instance;
                if (localInstance == null) {
                    Instance = localInstance = new FileLog();
                }
            }
        }
        return localInstance;
    }

    public FileLog() {
        dateFormat = FastDateFormat.getInstance("yyyyMMdd_HHmmss", Locale.US);
        try {
            File sdCard = ApplicationLoader.applicationContext.getExternalFilesDir(null);
            if (sdCard == null) {
                return;
            }
            File dir = new File(sdCard.getAbsolutePath() + "/logs");
            dir.mkdirs();
            currentFile = new File(dir, dateFormat.format(System.currentTimeMillis()) + ".txt");
        } catch (Exception e) {
            e.printStackTrace();
        }
        try {
            logQueue = new DispatchQueue("logQueue");
            currentFile.createNewFile();
            FileOutputStream stream = new FileOutputStream(currentFile);
            streamWriter = new OutputStreamWriter(stream);
            streamWriter.write("-----start log " + dateFormat.format(System.currentTimeMillis()) + "-----\n");
            streamWriter.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static void log(final String what, final String tag, final String message)
    {
        if (getInstance().streamWriter != null) {
            getInstance().logQueue.postRunnable(new Runnable() {
                @Override
                public void run() {
                    try {
                        getInstance().streamWriter.write(getInstance().dateFormat.format(System.currentTimeMillis()) + " " + what + "/" + tag + ": " + message + "\n");
                        getInstance().streamWriter.flush();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            });
        }
    }

    public static void e(final String tag, final String message) {
        log("E", tag, message);
    }

    public static void w(final String tag, final String message) {
        log("W", tag, message);
    }

    public static void i(final String tag, final String message) {
        log("I", tag, message);
    }
}