code: // Licensed to the Software Freedom Conservancy (SFC) under one
  // or more contributor license agreements.  See the NOTICE file
  // distributed with this work for additional information
  // regarding copyright ownership.  The SFC licenses this file
  // to you 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.openqa.selenium.grid.log;
  
  import java.io.OutputStream;
  import java.util.Objects;
  import java.util.logging.LogRecord;
  import java.util.logging.StreamHandler;
  
  class FlushingHandler extends StreamHandler {
  
    private OutputStream out;
  
    FlushingHandler(OutputStream out) {
      setOutputStream(out);
    }
  
    @Override
    protected synchronized void setOutputStream(OutputStream out) throws SecurityException {
      super.setOutputStream(out);
      this.out = out;
    }
  
    @Override
    public synchronized void publish(LogRecord record) {
      super.publish(record);
      flush();
    }
  
    @Override
    public synchronized void close() throws SecurityException {
      // Avoid closing sysout or syserr
      if (Objects.equals(System.out, out) || Objects.equals(System.err, out)) {
        flush();
      } else {
        super.close();
      }
    }
  }
  