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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.filtermanager; |
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|
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//---IMPORTS--- |
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import uk.ac.ukc.iscream.core.*; |
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import uk.ac.ukc.iscream.filter.*; |
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import uk.ac.ukc.iscream.util.*; |
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import uk.ac.ukc.iscream.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: tdb1 $ |
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* @version $Id: HostInit.java,v 1.23 2001/03/05 09:50:58 tdb1 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: 1.23 $"; |
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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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_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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try { |
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String inBound = _socketIn.readLine(); |
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if (!inBound.equals("STARTCONFIG")) { |
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_socketOut.println("ERROR"); |
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throw new IOException("protocol error - expected:STARTCONFIG got:" + inBound); |
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} |
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|
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Configuration myConfig = _configManager.getConfiguration("Host." + _socket.getInetAddress().getHostName().toLowerCase()); |
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if (myConfig == null) { |
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_socketOut.println("ERROR"); |
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throw new IOException("error in host configuration"); |
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} else { |
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_socketOut.println("OK"); |
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|
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// get lastmodified |
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inBound = _socketIn.readLine(); |
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if(!inBound.equals("LASTMODIFIED")) { |
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// protocol error |
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_socketOut.println("ERROR"); |
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throw new IOException("protocol error - expected:LASTMODIFIED got:" + inBound); |
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} |
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else { |
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// send info |
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_socketOut.println(myConfig.getLastModified()); |
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} |
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|
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// get config fileList |
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inBound = _socketIn.readLine(); |
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if(!inBound.equals("FILELIST")) { |
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// protocol error |
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_socketOut.println("ERROR"); |
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throw new IOException("protocol error - expected:FILELIST got:" + inBound); |
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} |
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else { |
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// send info |
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_socketOut.println(myConfig.getFileList()); |
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} |
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|
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// send the FQDN to the host |
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inBound = _socketIn.readLine(); |
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if(!inBound.equals("FQDN")) { |
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// protocol error |
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_socketOut.println("ERROR"); |
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throw new IOException("protocol error - expected:FQDN got:" + inBound); |
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} |
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else { |
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// send the fqdn (of the host) to the host |
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_socketOut.println(_socket.getInetAddress().getHostName().toLowerCase()); |
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} |
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|
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// get properties |
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inBound = _socketIn.readLine(); |
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while(!inBound.equals("ENDCONFIG")) { |
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|
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// get the property |
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try { |
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String returnedProperty = myConfig.getProperty("Host."+inBound); |
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|
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_socketOut.println(returnedProperty); |
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|
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} catch (org.omg.CORBA.MARSHAL e) { |
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_socketOut.println("ERROR"); |
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} |
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inBound = _socketIn.readLine(); |
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} |
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_logger.write(toString(), Logger.SYSMSG, "configured host"); |
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_socketOut.println("OK"); |
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|
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// get filter reference |
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inBound = _socketIn.readLine(); |
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if(!inBound.equals("FILTER")) { |
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// protocol error |
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_socketOut.println("ERROR"); |
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throw new IOException("protocol error - expected:FILTER got:" + inBound); |
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} |
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else { |
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// send info |
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String filterList = myConfig.getProperty("Host.filter"); |
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Filter filterRef = null; |
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String filter = null; |
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StringTokenizer st = new StringTokenizer(filterList, ";"); |
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while (filterRef==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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filterRef = FilterHelper.narrow(ReferenceManager.getInstance().getCORBARef("iscream.Filter." + 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(filterRef != null) { |
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_logger.write(toString(), Logger.DEBUG, " found filter- " + filter); |
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// tell the host about it... |
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_socketOut.println(filterRef.getHostName() + ";" |
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+ filterRef.getUDPPort() + ";" |
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+ filterRef.getTCPPort()); |
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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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_socketOut.println("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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// confirm that all is ok |
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inBound = _socketIn.readLine(); |
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if(!inBound.equals("END")) { |
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// protocol error |
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_socketOut.println("ERROR"); |
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throw new IOException("protocol error - expected:END got:" + inBound); |
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} |
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else { |
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// send ok |
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_socketOut.println("OK"); |
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} |
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|
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} |
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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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_socketOut.flush(); |
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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.ac.ukc.iscream.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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//---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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} |
