| /* |
| * 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.catalina.tribes.group.interceptors; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.util.zip.GZIPInputStream; |
| import java.util.zip.GZIPOutputStream; |
| |
| import org.apache.catalina.tribes.ChannelException; |
| import org.apache.catalina.tribes.ChannelMessage; |
| import org.apache.catalina.tribes.Member; |
| import org.apache.catalina.tribes.group.ChannelInterceptorBase; |
| import org.apache.catalina.tribes.group.InterceptorPayload; |
| import org.apache.juli.logging.Log; |
| import org.apache.juli.logging.LogFactory; |
| |
| |
| /** |
| * @author Filip Hanik |
| * @version 1.0 |
| */ |
| public class GzipInterceptor extends ChannelInterceptorBase { |
| |
| private static final Log log = LogFactory.getLog(GzipInterceptor.class); |
| |
| public static final int DEFAULT_BUFFER_SIZE = 2048; |
| |
| @Override |
| public void sendMessage(Member[] destination, ChannelMessage msg, InterceptorPayload payload) throws ChannelException { |
| try { |
| byte[] data = compress(msg.getMessage().getBytes()); |
| msg.getMessage().trim(msg.getMessage().getLength()); |
| msg.getMessage().append(data,0,data.length); |
| super.sendMessage(destination, msg, payload); |
| } catch ( IOException x ) { |
| log.error("Unable to compress byte contents"); |
| throw new ChannelException(x); |
| } |
| } |
| |
| @Override |
| public void messageReceived(ChannelMessage msg) { |
| try { |
| byte[] data = decompress(msg.getMessage().getBytes()); |
| msg.getMessage().trim(msg.getMessage().getLength()); |
| msg.getMessage().append(data,0,data.length); |
| super.messageReceived(msg); |
| } catch ( IOException x ) { |
| log.error("Unable to decompress byte contents",x); |
| } |
| } |
| |
| public static byte[] compress(byte[] data) throws IOException { |
| ByteArrayOutputStream bout = new ByteArrayOutputStream(); |
| GZIPOutputStream gout = new GZIPOutputStream(bout); |
| gout.write(data); |
| gout.flush(); |
| gout.close(); |
| return bout.toByteArray(); |
| } |
| |
| /** |
| * @param data Data to decompress |
| * @return Decompressed data |
| * @throws IOException |
| */ |
| public static byte[] decompress(byte[] data) throws IOException { |
| ByteArrayOutputStream bout = |
| new ByteArrayOutputStream(DEFAULT_BUFFER_SIZE); |
| ByteArrayInputStream bin = new ByteArrayInputStream(data); |
| GZIPInputStream gin = new GZIPInputStream(bin); |
| byte[] tmp = new byte[DEFAULT_BUFFER_SIZE]; |
| int length = gin.read(tmp); |
| while (length > -1) { |
| bout.write(tmp, 0, length); |
| length = gin.read(tmp); |
| } |
| return bout.toByteArray(); |
| } |
| } |