How to use

getChannel

method

in

ch.qos.logback.core.recovery.ResilientFileOutputStream

private void safeWrite(E event) throws IOException {
 ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
 FileChannel fileChannel = resilientFOS.getChannel();
 if (fileChannel == null) {
  return;
 }
 FileLock fileLock = null;
 try {
  fileLock = fileChannel.lock();
  long position = fileChannel.position();
  long size = fileChannel.size();
  if (size != position) {
   fileChannel.position(size);
  }
  super.writeOut(event);
 } finally {
  if (fileLock != null) {
   fileLock.release();
  }
 }
}

 public class MyFileAppender<E> extends FileAppender<E> {
  protected void writeOut(E event) throws IOException {
    super.writeOut(event);
    ResilientFileOutputStream resilientFos = (ResilientFileOutputStream) super.getOutputStream();
    resilientFos.flush();
    resilientFos.getChannel().force(true);
  }
}

private void safeWrite(E event) throws IOException {
 ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
 FileChannel fileChannel = resilientFOS.getChannel();
 if (fileChannel == null) {
  return;
 }
 FileLock fileLock = null;
 try {
  fileLock = fileChannel.lock();
  long position = fileChannel.position();
  long size = fileChannel.size();
  if (size != position) {
   fileChannel.position(size);
  }
  super.writeOut(event);
 } finally {
  if (fileLock != null) {
   fileLock.release();
  }
 }
}

private void safeWrite(E event) throws IOException {
 ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
 FileChannel fileChannel = resilientFOS.getChannel();
 if (fileChannel == null) {
  return;
 }
 FileLock fileLock = null;
 try {
  fileLock = fileChannel.lock();
  long position = fileChannel.position();
  long size = fileChannel.size();
  if (size != position) {
   fileChannel.position(size);
  }
  super.writeOut(event);
 } finally {
  if (fileLock != null) {
   fileLock.release();
  }
 }
}

private void safeWrite(E event) throws IOException {
 ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
 FileChannel fileChannel = resilientFOS.getChannel();
 if (fileChannel == null) {
  return;
 }
 // Clear any current interrupt (see LOGBACK-875)
 boolean interrupted = Thread.interrupted();
 FileLock fileLock = null;
 try {
  fileLock = fileChannel.lock();
  long position = fileChannel.position();
  long size = fileChannel.size();
  if (size != position) {
   fileChannel.position(size);
  }
  super.writeOut(event);
 } catch (IOException e) {
  // Mainly to catch FileLockInterruptionExceptions (see LOGBACK-875)
  resilientFOS.postIOFailure(e);
 } finally {
  if (fileLock != null && fileLock.isValid()) {
   fileLock.release();
  }
  // Re-interrupt if we started in an interrupted state (see LOGBACK-875)
  if (interrupted) {
   Thread.currentThread().interrupt();
  }
 }
}

private void safeWrite(E event) throws IOException {
  ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
  FileChannel fileChannel = resilientFOS.getChannel();
  if (fileChannel == null) {
    return;
  }
  // Clear any current interrupt (see LOGBACK-875)
  boolean interrupted = Thread.interrupted();
  FileLock fileLock = null;
  try {
    fileLock = fileChannel.lock();
    long position = fileChannel.position();
    long size = fileChannel.size();
    if (size != position) {
      fileChannel.position(size);
    }
    super.writeOut(event);
  } catch (IOException e) {
    // Mainly to catch FileLockInterruptionExceptions (see LOGBACK-875)
    resilientFOS.postIOFailure(e);
  } finally {
    if (fileLock != null && fileLock.isValid()) {
      fileLock.release();
    }
    // Re-interrupt if we started in an interrupted state (see LOGBACK-875)
    if (interrupted) {
      Thread.currentThread().interrupt();
    }
  }
}

private void safeWrite(E event) throws IOException {
  ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
  FileChannel fileChannel = resilientFOS.getChannel();
  if (fileChannel == null) {
    return;
  }
  // Clear any current interrupt (see LOGBACK-875)
  boolean interrupted = Thread.interrupted();
  FileLock fileLock = null;
  try {
    fileLock = fileChannel.lock();
    long position = fileChannel.position();
    long size = fileChannel.size();
    if (size != position) {
      fileChannel.position(size);
    }
    super.writeOut(event);
  } catch (IOException e) {
    // Mainly to catch FileLockInterruptionExceptions (see LOGBACK-875)
    resilientFOS.postIOFailure(e);
  } finally {
    if (fileLock != null && fileLock.isValid()) {
      fileLock.release();
    }
    // Re-interrupt if we started in an interrupted state (see LOGBACK-875)
    if (interrupted) {
      Thread.currentThread().interrupt();
    }
  }
}

private void safeWrite(E event) throws IOException {
 ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
 FileChannel fileChannel = resilientFOS.getChannel();
 if (fileChannel == null) {
  return;

private void safeWrite(E event) throws IOException {
  ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) getOutputStream();
  FileChannel fileChannel = resilientFOS.getChannel();
  if (fileChannel == null) {
    return;
  }
  // Clear any current interrupt (see LOGBACK-875)
  boolean interrupted = Thread.interrupted();
  FileLock fileLock = null;
  try {
    fileLock = fileChannel.lock();
    long position = fileChannel.position();
    long size = fileChannel.size();
    if (size != position) {
      fileChannel.position(size);
    }
    super.writeOut(event);
  } catch (IOException e) {
    // Mainly to catch FileLockInterruptionExceptions (see LOGBACK-875)
    resilientFOS.postIOFailure(e);
  } finally {
    if (fileLock != null && fileLock.isValid()) {
      fileLock.release();
    }
    // Re-interrupt if we started in an interrupted state (see LOGBACK-875)
    if (interrupted) {
      Thread.currentThread().interrupt();
    }
  }
}

 private void closeLogFileOnPurpose() throws IOException {
  ResilientFileOutputStream resilientFOS = (ResilientFileOutputStream) fa
   .getOutputStream();
  FileChannel fileChannel = resilientFOS.getChannel();
  fileChannel.close();
 }
}

@Test
public void verifyRecuperationAfterFailure() throws Exception {
 File file = new File(CoreTestConstants.OUTPUT_DIR_PREFIX+"resilient"+diff+".log");
 ResilientFileOutputStream rfos = new ResilientFileOutputStream(file, true, FileAppender.DEFAULT_BUFFER_SIZE);
 rfos.setContext(context);
 ResilientFileOutputStream spy = spy(rfos);
 spy.write("a".getBytes());
 spy.flush();
 spy.getChannel().close();
 spy.write("b".getBytes());
 spy.flush();
 Thread.sleep(RecoveryCoordinator.BACKOFF_COEFFICIENT_MIN+10);
 spy.write("c".getBytes());
 spy.flush();
 verify(spy).openNewOutputStream();
}