| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF 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.apache.knox.gateway.audit.log4j.appender; |
| |
| import java.io.File; |
| import java.io.IOException; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| |
| import org.apache.log4j.AppenderSkeleton; |
| import org.apache.log4j.Logger; |
| import org.apache.log4j.spi.LoggingEvent; |
| |
| public class JdbmStoreAndForwardAppender extends AppenderSkeleton { |
| |
| private File file; |
| private Thread forwarder; //NOPMD - Expected use of threading |
| private JdbmQueue<LoggingEvent> queue; |
| private Logger forward; |
| private boolean fetchLocationInfo = true; |
| |
| @Override |
| public boolean requiresLayout() { |
| return false; |
| } |
| |
| public void setFile( String file ) { |
| this.file = new File( file ); |
| } |
| |
| public void setFetchLocationInfo( boolean fetchLocationInfo ) { |
| this.fetchLocationInfo = fetchLocationInfo; |
| } |
| |
| public boolean isFetchLocationInfo() { |
| return fetchLocationInfo; |
| } |
| |
| @Override |
| public void activateOptions() { |
| try { |
| queue = new JdbmQueue<>( file ); |
| } catch ( IOException e ) { |
| throw new IllegalStateException( e ); |
| } |
| forward = Logger.getLogger( "audit.forward" ); |
| forward.setAdditivity( false ); |
| forwarder = new Forwarder(); |
| forwarder.setDaemon( true ); |
| forwarder.start(); |
| } |
| |
| @Override |
| protected void append( LoggingEvent event ) { |
| try { |
| if( fetchLocationInfo ) { |
| event.getLocationInformation(); |
| } |
| queue.enqueue( event ); |
| } catch ( IOException e ) { |
| throw new RuntimeException( e ); |
| } |
| } |
| |
| @Override |
| public void close() { |
| try { |
| queue.stop(); |
| forwarder.join(); |
| queue.close(); |
| } catch(InterruptedException e) { |
| Thread.currentThread().interrupt(); |
| throw new RuntimeException(e); |
| } catch(IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| @SuppressWarnings("PMD.DoNotUseThreads") |
| private class Forwarder extends Thread { |
| @Override |
| public void run() { |
| final AtomicBoolean done = new AtomicBoolean( false ); |
| while( !done.get() ) { |
| try { |
| queue.process( new JdbmQueue.Consumer<LoggingEvent>() { |
| @Override |
| public boolean consume( LoggingEvent event ) { |
| try { |
| if( event == null ) { |
| done.set( true ); |
| } else { |
| forward.callAppenders( event ); |
| } |
| return true; |
| } catch ( Exception e ) { |
| e.printStackTrace(); |
| return false; |
| } |
| } |
| } ); |
| } catch ( ThreadDeath e ) { |
| throw e; |
| } catch ( Throwable t ) { |
| t.printStackTrace(); |
| } |
| } |
| } |
| } |
| } |