Android Open Source - AGOGCyberStat Rolling File Appender

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License

The source code is released under:
MIT License
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Java Source Code

package me.allenz.androidapplog;
//  w w  w  .  j a  v  a2s. c om
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class RollingFileAppender extends AsyncAppender {

    private File logDir;

    private String packageName;

    private int rolling;

    private long rollSize;

    private File logFile;

    private FileOutputStream out;

    public RollingFileAppender(final File logDir, final long rollSize){
        this.logDir = logDir;
        this.rollSize = rollSize;
        packageName = LoggerFactory.getPackageName();
    }

    @Override
    protected boolean doStart() {
        final boolean created = createLogDir();
        if (!created) {
            LoggerFactory.getInternalLogger().verbose("can not create folder %s", logDir.getPath());
            return false;
        }
        rolling = getRollingNumber();
        logFile = getLogFile(rolling);
        try {
            out = createOrOpenLogFile(logFile);
        } catch (final IOException e) {
            e.printStackTrace();
        }
        return super.doStart();
    }

    @Override
    protected boolean doStop() {
        try {
            out.close();
        } catch (final IOException e) {
        }
        return super.doStop();
    }

    private boolean createLogDir() {
        if (!logDir.exists()) {
            return logDir.mkdirs();
        }
        return true;
    }

    private int getRollingNumber() {
        final Pattern fileNamePattern = Pattern.compile("^" +
                                                        packageName.replace(".", "\\.").replace("$", "\\$") +
                                                        "\\.(\\d+)\\.log(\\.gz)+$");
        int number = 0;
        final File[] logFiles = logDir.listFiles();
        for (int i = 0; i < logFiles.length; i++) {
            final String logFileName = logFiles[i].getName();
            final Matcher matcher = fileNamePattern.matcher(logFileName);
            if (matcher.find()) {
                try {
                    final Integer currentNumber = Integer.valueOf(matcher.group(1));
                    if (number < currentNumber) {
                        number = currentNumber;
                    }
                } catch (final NumberFormatException e) {
                }
            }
        }
        return number;
    }

    private File getLogFile(final int rolling) {
        String logFilename = packageName;
        if (rolling > 0) {
            logFilename += "." +
                           rolling;
        }
        logFilename += ".log";
        return new File(logDir, logFilename);
    }

    private FileOutputStream createOrOpenLogFile(final File logFile) throws IOException {
        if (!logFile.exists()) {
            logFile.createNewFile();
            return new FileOutputStream(logFile);
        } else {
            return new FileOutputStream(logFile, true);
        }
    }

    @Override
    protected void handleEventQueue() throws InterruptedException {
        try {
            final LogEvent event = logEventQueue.take();
            final byte[] logBytes = event.toString().getBytes();
            if (!logFile.exists()) {
                out.close();
                out = createOrOpenLogFile(logFile);
            }
            final long logFileSize = out.getChannel().size();
            if (logFileSize +
                logBytes.length > rollSize) {
                out.close();
                Runtime.getRuntime().exec("gzip " +
                                          logFile.getPath());
                rolling++;
                logFile = getLogFile(rolling);
                out = createOrOpenLogFile(logFile);
            }
            out.write(logBytes);
            out.flush();
            out.getFD().sync();
        } catch (final IOException e) {
            e.printStackTrace();
        }
    }
}
Java Source Code List
