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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.filter; |
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package uk.org.iscream.cms.server.filter; |
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//---IMPORTS--- |
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import java.io.*; |
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import java.net.*; |
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import java.util.*; |
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import uk.ac.ukc.iscream.core.*; |
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import uk.ac.ukc.iscream.componentmanager.*; |
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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.org.iscream.cms.server.core.*; |
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import uk.org.iscream.cms.server.componentmanager.*; |
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import uk.org.iscream.cms.server.filter.*; |
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import uk.org.iscream.cms.server.util.*; |
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/** |
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* This class contains the main method to be run by |
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* the filter children. It harvests UDP traffic. |
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* the filterd. It harvests UDP traffic, and queues it. |
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* |
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* @author $Author$ |
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* @version $Id$ |
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* The current CVS revision of this class |
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*/ |
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public final String REVISION = "$Revision$"; |
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/** |
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* The maximum size of a packet |
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*/ |
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//---CONSTRUCTORS--- |
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/** |
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* It is normal to use this constructor in preference |
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* to any other in this class. |
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* Constructs a new UDPReader. |
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* |
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* @param port The port on which we listen for UDP data |
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* @param queue The queue which we are using |
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*/ |
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public UDPReader(int port, Queue queue){ |
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// set the Thread name |
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setName("filter.UDPReader"); |
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_port = port; |
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_queue = queue; |
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_logger.write(toString(), Logger.SYSINIT, "started"); |
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} |
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//---PUBLIC METHODS--- |
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/** |
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* The main method in the class. Reads and queues XML sent |
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* over UDP. |
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*/ |
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public void run() { |
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// setup an empty ACL defaulting to ALLOW |
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ACL acl = new ACL(ACL.ALLOW); |
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// setup a Datagram socket |
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DatagramSocket socket = null; |
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try { |
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socket = new DatagramSocket(_port); |
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socket = new ACLDatagramSocket(acl, _port); |
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} |
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catch (BindException e){ |
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_logger.write(this.toString(), Logger.FATAL, "Could not start the UDPReader thread on port "+_port+" as this port was already in use."); |
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} |
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_logger.write(this.toString(), Logger.SYSMSG, "UDPReader thread ready and listening for UDP packets on port "+_port); |
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byte[] buf; |
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ConfigurationProxy cp = ConfigurationProxy.getInstance(); |
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String stringACL = ""; |
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String newStringACL = ""; |
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// read UDP packets and queue them |
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boolean running = true; |
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while (running){ |
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// get hold of the ACL in the configuration |
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try { |
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// receive request and put it in the Queue |
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newStringACL = cp.getProperty("Filter." + FilterMain.NAME, "Filter.UDPACL"); |
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} |
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catch(PropertyNotFoundException e) { |
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// if we can't find it, we'll just use a null ACL |
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newStringACL = ""; |
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_logger.write(toString(), Logger.WARNING, "No ACL found for UDPReader, using empty ACL instead: " + e); |
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} |
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// check to see if the ACL has changed |
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if(!newStringACL.equals(stringACL)) { |
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_logger.write(toString(), Logger.SYSMSG, "Reloading Access Control List"); |
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// clear the ACL |
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acl.clear(); |
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// set the default to something sane |
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acl.setDefaultMode(ACL.ALLOW); |
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// add the new ACL (this may change the default) |
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acl.add(newStringACL); |
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stringACL = newStringACL; |
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} |
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try { |
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// receive request and put it in the Queue |
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buf = new byte[packetSizeLimit]; |
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DatagramPacket packet = new DatagramPacket(buf, buf.length); |
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socket.receive(packet); |
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} |
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catch (IOException e) { |
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_logger.write(this.toString(), Logger.WARNING, "This UDPReader thread has been shut down as an exception occured: "+e); |
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return; |
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running = false; |
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} |
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} |
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socket.close(); |
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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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* This uses the uk.org.iscream.cms.server.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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* be changed to null for utility classes. |
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*/ |
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private String _name = FilterMain.NAME; |
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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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* The Queue object |
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*/ |
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Queue _queue; |
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Queue _queue; |
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//---STATIC ATTRIBUTES--- |
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