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/* |
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* i-scream central monitoring system |
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* http://www.i-scream.org |
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* Copyright (C) 2000-2002 i-scream |
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* |
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* This program is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License |
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* as published by the Free Software Foundation; either version 2 |
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* of the License, or (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
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*/ |
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|
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//---PACKAGE DECLARATION--- |
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package uk.org.iscream.cms.server.filtermanager; |
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|
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//---IMPORTS--- |
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import uk.org.iscream.cms.server.core.*; |
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import uk.org.iscream.cms.server.filter.*; |
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import uk.org.iscream.cms.util.*; |
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import uk.org.iscream.cms.server.componentmanager.*; |
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import java.net.*; |
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import java.io.*; |
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import java.util.*; |
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|
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/** |
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* Handles setting up a host. |
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* This class provides a host with appropriate configuration |
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* and a reference to a Filter to which it should pass data. |
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* |
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* @author $Author: tdb $ |
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* @version $Id: HostInit.java,v 1.40 2004/08/01 10:41:05 tdb Exp $ |
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*/ |
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class HostInit extends Thread { |
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|
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//---FINAL ATTRIBUTES--- |
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|
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/** |
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* The current CVS revision of this class |
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*/ |
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public final String REVISION = "$Revision: 1.40 $"; |
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|
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//---STATIC METHODS--- |
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|
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//---CONSTRUCTORS--- |
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|
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/** |
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* Construct a new HostInit. |
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* |
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* @param socket The socket to which the host is connected |
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*/ |
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public HostInit(Socket socket) throws IOException { |
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// set the Thread name |
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setName("filtermanager.HostInit"); |
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|
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_socket = socket; |
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// setup reader & writer |
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_socketIn = new BufferedReader(new InputStreamReader(_socket.getInputStream())); |
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_socketOut = new PrintWriter(_socket.getOutputStream(), true); |
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_logger.write(toString(), Logger.SYSINIT, "created"); |
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} |
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|
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//---PUBLIC METHODS--- |
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|
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/** |
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* Main method in this class, which handles communicating with |
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* the host to determine it's setup. |
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*/ |
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public void run() { |
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// get a hook on the config proxy |
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ConfigurationProxy cp = ConfigurationProxy.getInstance(); |
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// this is our config name |
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String configName = "Host." + _socket.getInetAddress().getHostName().toLowerCase(); |
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try { |
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// look for a command: |
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// STARTCONFIG - to get a configuration |
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// CHECKCONFIG - to check a configuration |
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// END - to finish |
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String cmd = getInBound(); |
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while(!cmd.equals("END")) { |
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if(cmd.equals("STARTCONFIG")) { |
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// respond to STARTCONFIG |
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send("OK"); |
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|
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// try for LASTMODIFIED |
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getInBound("LASTMODIFIED"); |
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send("" + cp.getLastModified(configName)); |
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|
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// try for FILELIST |
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getInBound("FILELIST"); |
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send(cp.getFileList(configName)); |
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|
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// try for FQDN |
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getInBound("FQDN"); |
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send(_socket.getInetAddress().getHostName().toLowerCase()); |
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|
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// try for IP |
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getInBound("IP"); |
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send(_socket.getInetAddress().getHostAddress()); |
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|
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// get properties |
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String reqProperty = getInBound(); |
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while(!reqProperty.equals("ENDCONFIG")) { |
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// get the property |
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try { |
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String returnedProperty = cp.getProperty(configName, "Host."+reqProperty); |
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send(returnedProperty); |
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} catch (PropertyNotFoundException e) { |
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send("ERROR"); |
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} |
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// get the next request |
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reqProperty = _socketIn.readLine(); |
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} |
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_logger.write(toString(), Logger.SYSMSG, "configured host"); |
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send("OK"); |
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|
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// get filter reference |
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getInBound("FILTER"); |
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// send info |
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String filterList = cp.getProperty(configName, "Host.filter"); |
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FilterInfo filterInfoRef = null; |
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String filter = null; |
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StringTokenizer st = new StringTokenizer(filterList, ";"); |
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while (filterInfoRef==null && st.hasMoreTokens()) { |
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filter = st.nextToken(); |
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_logger.write(toString(), Logger.DEBUG, " looking for filter- " + filter); |
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try { |
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filterInfoRef = FilterInfoHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.FilterInfo\\." + filter)); |
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} catch (ComponentCORBAException e) { |
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_logger.write(toString(), Logger.DEBUG, " unable to find filter- " + filter); |
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} |
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} |
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|
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// hopefully we found a filter |
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if(filterInfoRef != null) { |
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_logger.write(toString(), Logger.DEBUG, " found filter- " + filter); |
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try { |
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// tell the host about it... |
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send(filterInfoRef.getHostName() + ";" |
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+ filterInfoRef.getUDPPort()); |
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} |
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catch(org.omg.CORBA.COMM_FAILURE e) { |
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// failed to talk to filter, lets signal an error |
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send("ERROR"); |
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throw new IOException("error communicating with filter - " + e); |
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} |
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} |
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else { |
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// ...or throw a wobbly (and tell the host!) |
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send("ERROR"); |
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throw new IOException("unable to find filter for host"); |
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} |
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|
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} |
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else if(cmd.equals("CHECKCONFIG")) { |
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// respond to CHECKCONFIG |
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send("OK"); |
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|
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// try for {filelist} |
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String filelist = getInBound(); |
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send("OK"); |
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|
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// try for {lastModified} |
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String lastModified = getInBound(); |
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long lastmod; |
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try { |
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lastmod = Long.parseLong(lastModified); |
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} |
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catch(NumberFormatException e) { |
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send("ERROR"); |
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throw new IOException("Last Modified invalid: " + e); |
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} |
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|
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// check to see if a config update has happen |
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boolean newConfig = _configManager.isModified(filelist, lastmod); |
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if(newConfig) { |
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// new config ! |
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send("EXPIRED"); |
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} |
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else { |
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// nothing has changed |
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send("OK"); |
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} |
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} |
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else { |
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send("ERROR"); |
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} |
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// get the next command |
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cmd = getInBound(); |
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} |
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// respond to END |
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send("OK"); |
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|
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} catch (Exception e) { |
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_logger.write(toString(), Logger.ERROR, "ERROR - " + e); |
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} |
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|
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// Disconnect streams & socket |
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try { |
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_socketIn.close(); |
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_socketOut.close(); |
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_socket.close(); |
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} catch (IOException e) { |
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_logger.write(toString(), Logger.ERROR, "exception on socket close"); |
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} |
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_logger.write(toString(), Logger.SYSMSG, "finished"); |
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} |
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|
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/** |
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* Overrides the {@link java.lang.Object#toString() Object.toString()} |
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* method to provide clean logging (every class should have this). |
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* |
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* This uses the uk.org.iscream.cms.util.NameFormat class |
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* to format the toString() |
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* |
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* @return the name of this class and its CVS revision |
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*/ |
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public String toString() { |
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return FormatName.getName( |
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_name, |
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getClass().getName(), |
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REVISION); |
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} |
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|
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//---PRIVATE METHODS--- |
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|
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private String getInBound(String expected) throws IOException { |
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// grab the input |
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String inBound = getInBound(); |
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// check if it's what we're expecting |
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if(!inBound.equals(expected)) { |
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send("ERROR"); |
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throw new IOException("protocol error - expected:"+expected+" got:" + inBound); |
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} |
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// it should be ok then |
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return inBound; |
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} |
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|
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private String getInBound() throws IOException { |
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// grab the input |
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String inBound = _socketIn.readLine(); |
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// check for null's, likely disconnection |
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if(inBound == null) { |
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throw new IOException("got null from host, maybe it died"); |
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} |
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// it's a valid message it seems |
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return inBound; |
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} |
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|
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/* Use this instead of println. println under windows terminates the lines |
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* in \c\n which is not the expected result for the ihost client. |
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*/ |
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private void send(String data) { |
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_socketOut.print(data + "\n"); |
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_socketOut.flush(); |
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} |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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|
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//---ATTRIBUTES--- |
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|
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/** |
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* This holds a reference to the |
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* system logger that is being used. |
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*/ |
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private Logger _logger = ReferenceManager.getInstance().getLogger(); |
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|
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/** |
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* A reference to the Configuration Manager the system is using |
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*/ |
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private ConfigurationManager _configManager = ReferenceManager.getInstance().getCM(); |
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|
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/** |
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* This is the friendly identifier of the |
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* component this class is running in. |
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* eg, a Filter may be called "filter1", |
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* If this class does not have an owning |
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* component, a name from the configuration |
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* can be placed here. This name could also |
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* be changed to null for utility classes. |
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*/ |
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private String _name = FilterManager.NAME; |
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|
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/** |
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* The socket this class uses |
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*/ |
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private Socket _socket; |
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|
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/** |
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* Used for the input stream of this socket |
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*/ |
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private BufferedReader _socketIn; |
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|
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/** |
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* Used for the output stream of this socket |
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*/ |
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private PrintWriter _socketOut; |
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|
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//---STATIC ATTRIBUTES--- |
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|
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} |