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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.filter; |
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|
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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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|
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/** |
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* Handle an incoming packet as a separate thread. |
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* Passes the data through various plugins, then |
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* passes it on to the parent filter. |
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* |
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* Now grabs data from a single queue, rather than |
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* waiting to be contacted. |
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* |
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* @author $Author: tdb1 $ |
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* @version $Id: FilterThread.java,v 1.21 2001/02/12 00:36:20 tdb1 Exp $ |
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*/ |
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public class FilterThread 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: 1.21 $"; |
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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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* Constructs an instance of a FilterThread |
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* |
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* @param queue the Queue this filter is using |
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* @param parent a CORBA reference to our parent filter |
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*/ |
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public FilterThread(Queue queue, Filter parent){ |
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_parent = parent; |
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_queue = queue; |
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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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* Runs the thread, getting data from the Queue and |
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* sending it on to the parent filter. |
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*/ |
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public void run(){ |
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// get a queue for ourselves |
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int n = _queue.getQueue(); |
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// keep these out here, saves recreating the object |
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String xml = null; |
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while(true) { |
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// get a String of xml |
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try { |
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xml = (String) _queue.get(n); |
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} |
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catch (InvalidQueueException e) { |
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_logger.write(toString(), Logger.ERROR, "Queue error: "+e); |
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} |
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|
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// Get a string without any null characters in it. |
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// -- maybe String.trim() would be better here ? |
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if (xml.indexOf(0) != -1) { |
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xml = xml.substring(0, xml.indexOf(0)); |
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} |
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else { |
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xml = xml.substring(0, xml.length()); |
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} |
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|
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// Bundle the XML all on one line (saves space and simplifies |
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// the protocol between clientinterface and client). |
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StringTokenizer tokenizer = new StringTokenizer(new String(xml), "\n"); |
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xml = ""; |
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while (tokenizer.hasMoreTokens()) { |
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xml += tokenizer.nextToken(); |
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} |
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|
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// Use XMLPacketMaker to make an XMLPacket object. |
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XMLPacketMaker xmlPacketMaker = new XMLPacketMaker(xml); |
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XMLPacket packet = xmlPacketMaker.createXMLPacket(); |
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|
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if(packet != null) { |
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// packet is not null |
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// packet was not dropped by a plugin |
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// ... best pass it on ! |
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if(PluginFilterManager.getInstance().runFilters(packet)) { |
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_parent.receiveXML(xml); |
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} |
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else { |
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// we filtered it |
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_logger.write(toString(), Logger.DEBUG, "An XML packet was sucessfully filtered from the system."); |
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} |
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} |
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else { |
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// we had a null |
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_logger.write(toString(), Logger.DEBUG, "An XML packet containing ill-parsing XML was rejected."); |
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} |
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} |
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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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* Our parent filter |
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*/ |
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Filter _parent; |
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|
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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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|
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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 = FilterMain.NAME; |
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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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//---STATIC ATTRIBUTES--- |
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|
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} |
