| /* |
| * 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.logging.log4j.core.net; |
| |
| import org.apache.logging.log4j.Logger; |
| import org.apache.logging.log4j.core.appender.AppenderRuntimeException; |
| import org.apache.logging.log4j.status.StatusLogger; |
| |
| import java.io.IOException; |
| import java.io.OutputStream; |
| import java.net.DatagramPacket; |
| import java.net.DatagramSocket; |
| import java.net.InetAddress; |
| import java.net.SocketException; |
| import java.net.UnknownHostException; |
| |
| /** |
| * OutputStream for UDP connections. |
| */ |
| public class DatagramOutputStream extends OutputStream { |
| |
| /** |
| * Allow subclasses access to the status logger without creating another instance. |
| */ |
| protected static final Logger LOGGER = StatusLogger.getLogger(); |
| |
| private static final int SHIFT_1 = 8; |
| private static final int SHIFT_2 = 16; |
| private static final int SHIFT_3 = 24; |
| |
| private DatagramSocket ds; |
| private InetAddress address; |
| private int port; |
| |
| private byte[] data; |
| |
| /** |
| * The Constructor. |
| * @param host The host to connect to. |
| * @param port The port on the host. |
| */ |
| public DatagramOutputStream(String host, int port) { |
| this.port = port; |
| try { |
| address = InetAddress.getByName(host); |
| } catch (UnknownHostException ex) { |
| String msg = "Could not find host " + host; |
| LOGGER.error(msg, ex); |
| throw new AppenderRuntimeException(msg, ex); |
| } |
| |
| try { |
| ds = new DatagramSocket(); |
| } catch (SocketException ex) { |
| String msg = "Could not instantiate DatagramSocket to " + host; |
| LOGGER.error(msg, ex); |
| throw new AppenderRuntimeException(msg, ex); |
| } |
| } |
| |
| @Override |
| public synchronized void write(byte[] bytes, int offset, int length) throws IOException { |
| copy(bytes, offset, length); |
| } |
| |
| @Override |
| public synchronized void write(int i) throws IOException { |
| copy(new byte[] {(byte) (i >>> SHIFT_3), (byte) (i >>> SHIFT_2), (byte) (i >>> SHIFT_1), (byte) i}, 0, 4); |
| } |
| |
| @Override |
| public synchronized void write(byte[] bytes) throws IOException { |
| copy(bytes, 0, bytes.length); |
| } |
| |
| @Override |
| public synchronized void flush() throws IOException { |
| if (this.ds != null && this.address != null) { |
| DatagramPacket packet = new DatagramPacket(data, data.length, address, port); |
| ds.send(packet); |
| } |
| data = null; |
| } |
| |
| @Override |
| public synchronized void close() throws IOException { |
| if (ds != null) { |
| if (data != null) { |
| flush(); |
| } |
| ds.close(); |
| ds = null; |
| } |
| } |
| |
| private void copy(byte[] bytes, int offset, int length) { |
| int index = data == null ? 0 : data.length; |
| byte[] copy = new byte[length + index]; |
| if (data != null) { |
| System.arraycopy(data, 0, copy, 0, index); |
| } |
| System.arraycopy(bytes, offset, copy, index, length); |
| data = copy; |
| } |
| } |