+//
+// ========================================================================
+// Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
+// ------------------------------------------------------------------------
+// All rights reserved. This program and the accompanying materials
+// are made available under the terms of the Eclipse Public License v1.0
+// and Apache License v2.0 which accompanies this distribution.
+//
+// The Eclipse Public License is available at
+// http://www.eclipse.org/legal/epl-v10.html
+//
+// The Apache License v2.0 is available at
+// http://www.opensource.org/licenses/apache2.0.php
+//
+// You may elect to redistribute this code under either of these licenses.
+// ========================================================================
+//
+
+package org.eclipse.jetty.server;
+
+import java.io.IOException;
+import java.util.concurrent.BlockingQueue;
+import java.util.concurrent.TimeUnit;
+
+import org.eclipse.jetty.util.BlockingArrayQueue;
+import org.eclipse.jetty.util.log.Log;
+import org.eclipse.jetty.util.log.Logger;
+
+
+/* ------------------------------------------------------------ */
+/**
+ * An asynchronously writing NCSA Request Log
+ */
+public class AsyncNCSARequestLog extends NCSARequestLog
+{
+ private static final Logger LOG = Log.getLogger(AsyncNCSARequestLog.class);
+ private final BlockingQueue<String> _queue;
+ private transient WriterThread _thread;
+ private boolean _warnedFull;
+
+ public AsyncNCSARequestLog()
+ {
+ this(null,null);
+ }
+
+ public AsyncNCSARequestLog(BlockingQueue<String> queue)
+ {
+ this(null,queue);
+ }
+
+ public AsyncNCSARequestLog(String filename)
+ {
+ this(filename,null);
+ }
+
+ public AsyncNCSARequestLog(String filename,BlockingQueue<String> queue)
+ {
+ super(filename);
+ if (queue==null)
+ queue=new BlockingArrayQueue<>(1024);
+ _queue=queue;
+ }
+
+ private class WriterThread extends Thread
+ {
+ WriterThread()
+ {
+ setName("AsyncNCSARequestLog@"+Integer.toString(AsyncNCSARequestLog.this.hashCode(),16));
+ }
+
+ @Override
+ public void run()
+ {
+ while (isRunning())
+ {
+ try
+ {
+ String log = _queue.poll(10,TimeUnit.SECONDS);
+ if (log!=null)
+ AsyncNCSARequestLog.super.write(log);
+
+ while(!_queue.isEmpty())
+ {
+ log=_queue.poll();
+ if (log!=null)
+ AsyncNCSARequestLog.super.write(log);
+ }
+ }
+ catch (IOException e)
+ {
+ LOG.warn(e);
+ }
+ catch (InterruptedException e)
+ {
+ LOG.ignore(e);
+ }
+ }
+ }
+ }
+
+ @Override
+ protected synchronized void doStart() throws Exception
+ {
+ super.doStart();
+ _thread = new WriterThread();
+ _thread.start();
+ }
+
+ @Override
+ protected void doStop() throws Exception
+ {
+ _thread.interrupt();
+ _thread.join();
+ super.doStop();
+ _thread=null;
+ }
+
+ @Override
+ public void write(String log) throws IOException
+ {
+ if (!_queue.offer(log))
+ {
+ if (_warnedFull)
+ LOG.warn("Log Queue overflow");
+ _warnedFull=true;
+ }
+ }
+
+}