server/filtermanager/HostListener.java

/* 
 * i-scream central monitoring system
 * http://www.i-scream.org
 * Copyright (C) 2000-2002 i-scream
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

//---PACKAGE DECLARATION---
package uk.org.iscream.cms.server.filtermanager;

//---IMPORTS---
import uk.org.iscream.cms.server.core.*;
import uk.org.iscream.cms.server.componentmanager.*;
import uk.org.iscream.cms.server.filter.*;
import uk.org.iscream.cms.util.*;
import java.net.*;
import java.io.*;

/**
 * A socket listener to listen for new hosts registering with the system.
 * When a host makes a connection, the connecton is past to an instance
 * of the HostInit class, which handles further communication.
 *
 * @author  $Author: tdb $
 * @version $Id: HostListener.java,v 1.15 2003/02/05 16:43:47 tdb Exp $
 */
class HostListener extends Thread {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public final String REVISION = "$Revision: 1.15 $";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

        /**
     * Constructs a new listener
     *
         * @param listenPort The port that the server will listen on.
         */
    public HostListener() {
        // set the Thread name
        setName("filtermanager.HostListener");
        
        _logger.write(toString(), Logger.SYSINIT, "started");
    }

//---PUBLIC METHODS---

        /**
         * The run() method is the main loop for this thread, and we
         * will remain in here until such a point as something goes
         * wrong with the listening. After initially setting up the
         * ServerSocket we go round a while loop receiving connections
         * and then passing them off to other processes to deal with.
         */
    public void run(){
        // setup an empty ACL defaulting to ALLOW
        ACL acl = new ACL(ACL.ALLOW);
        
        ServerSocket listenSocket=null;
                // We use this boolean so we can break out of the while loop if we want
        boolean run = true;
        try{
            // Work out the port we want
            int listenPort = Integer.parseInt(ConfigurationProxy.getInstance().getProperty("FilterManager." + FilterManager.NAME, "FilterManager.listenPort"));
                        // Setup the ServerSocket so that clients can connect
                        listenSocket = new ACLServerSocket(acl, listenPort);
            _logger.write(toString(), Logger.SYSMSG, "Server listening on "
                                                                                +InetAddress.getLocalHost().getHostName()
                                                                                +"/"+InetAddress.getLocalHost().getHostAddress()
                                                                                +" port "+listenSocket.getLocalPort());
            
        }
        catch(UnknownHostException e){
                        _logger.write(toString(), Logger.SYSMSG, "Server listening on UnknownHost "
                                                                                +"port "+listenSocket.getLocalPort());
                }
        catch(IOException e){
            _logger.write(toString(), Logger.FATAL, "IO Error, can't start FilterManager :"+e);
            run = false;
        }
        catch(PropertyNotFoundException e){
            _logger.write(toString(), Logger.FATAL, "Fatal Error, can't find config :"+e);
            run = false;
        }
        catch(NumberFormatException e){
            _logger.write(toString(), Logger.FATAL, "Invalid port configuration found :"+e);
            run = false;
        }

                // Loop round constantly until we decide to stop
                ConfigurationProxy cp = ConfigurationProxy.getInstance();
        String stringACL = "";
        String newStringACL = "";
        while(run){
            // get hold of the ACL in the configuration
            try {
                newStringACL = cp.getProperty("FilterManager." + FilterManager.NAME, "FilterManager.ACL");
            }
            catch(PropertyNotFoundException e) {
                // if we can't find it, we'll just use a null ACL
                newStringACL = "";
                _logger.write(toString(), Logger.WARNING, "No ACL found for FilterManager, using empty ACL instead: " + e);
            }
            // check to see if the ACL has changed
            if(!newStringACL.equals(stringACL)) {
                _logger.write(toString(), Logger.SYSMSG, "Reloading Access Control List");
                // clear the ACL
                acl.clear();
                // set the default to something sane
                acl.setDefaultMode(ACL.ALLOW);
                // add the new ACL (this may change the default)
                acl.add(newStringACL);
                stringACL = newStringACL;
            }
            Socket hostSocket=null;
            try{
                _logger.write(toString(), Logger.SYSMSG, "Waiting for Connection");
                                // This will block until a host connects - at which point we get a Socket
                hostSocket = listenSocket.accept();
                _logger.write(toString(), Logger.SYSMSG, "Connection accepted from: " + hostSocket.toString());
            }
            catch(IOException e){
                                // Something went wrong with the ServerSocket, so we'll stop listening
                run=false;
            }
                        // If we've stopped on the line above we won't want to try this !
            if(run){
                                try {
                                    // Setup the HostInit so it can carry on communications with the host
                    HostInit init = new HostInit(hostSocket);
                                    // and start it
                    init.start();
                } catch (IOException e) {
                    _logger.write(toString(), Logger.ERROR, e.toString());
                }
            }
        }
                // Best log the fact that we're stopping
        _logger.write(toString(), Logger.FATAL, "Fatal error, shutdown pending");
    }

    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.org.iscream.cms.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            this.getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

//---ACCESSOR/MUTATOR METHODS---

//---ATTRIBUTES---
    
    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger = ReferenceManager.getInstance().getLogger();
    
    /**
     * This is the friendly identifier of the
     * component this class is running in.
     * eg, a Filter may be called "filter1",
     * If this class does not have an owning
     * component,  a name from the configuration
     * can be placed here.  This name could also
     * be changed to null for utility classes.
     */
    private String _name = FilterManager.NAME;
    
//---STATIC ATTRIBUTES---

}
Revision:	1.16
Committed:	Sun Aug 1 10:41:05 2004 UTC (19 years, 9 months ago) by tdb
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.15:	+3 -3 lines
Log Message:	Catch a lot of old URL's and update them. Also remove a couple of old files that aren't used.
#	User	Rev	Content
1	tdb	1.13	/*
2			* i-scream central monitoring system
3	tdb	1.16	* http://www.i-scream.org
4	tdb	1.13	* Copyright (C) 2000-2002 i-scream
5			*
6			* This program is free software; you can redistribute it and/or
7			* modify it under the terms of the GNU General Public License
8			* as published by the Free Software Foundation; either version 2
9			* of the License, or (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19			*/
20
21	tdb	1.1	//---PACKAGE DECLARATION---
22	tdb	1.9	package uk.org.iscream.cms.server.filtermanager;
23	tdb	1.1
24			//---IMPORTS---
25	tdb	1.9	import uk.org.iscream.cms.server.core.*;
26			import uk.org.iscream.cms.server.componentmanager.*;
27			import uk.org.iscream.cms.server.filter.*;
28	tdb	1.15	import uk.org.iscream.cms.util.*;
29	tdb	1.3	import java.net.*;
30			import java.io.*;
31	tdb	1.1
32			/**
33			* A socket listener to listen for new hosts registering with the system.
34			* When a host makes a connection, the connecton is past to an instance
35			* of the HostInit class, which handles further communication.
36			*
37	tdb	1.10	* @author $Author: tdb $
38	tdb	1.16	* @version $Id: HostListener.java,v 1.15 2003/02/05 16:43:47 tdb Exp $
39	tdb	1.1	*/
40			class HostListener extends Thread {
41
42			//---FINAL ATTRIBUTES---
43
44			/**
45			* The current CVS revision of this class
46			*/
47	tdb	1.16	public final String REVISION = "$Revision: 1.15 $";
48	tdb	1.1
49			//---STATIC METHODS---
50
51			//---CONSTRUCTORS---
52
53			/**
54			* Constructs a new listener
55			*
56	tdb	1.3	* @param listenPort The port that the server will listen on.
57	tdb	1.1	*/
58	tdb	1.7	public HostListener() {
59	tdb	1.6	// set the Thread name
60			setName("filtermanager.HostListener");
61
62	tdb	1.1	_logger.write(toString(), Logger.SYSINIT, "started");
63			}
64
65			//---PUBLIC METHODS---
66
67			/**
68			* The run() method is the main loop for this thread, and we
69			* will remain in here until such a point as something goes
70			* wrong with the listening. After initially setting up the
71			* ServerSocket we go round a while loop receiving connections
72			* and then passing them off to other processes to deal with.
73			*/
74			public void run(){
75	tdb	1.12	// setup an empty ACL defaulting to ALLOW
76			ACL acl = new ACL(ACL.ALLOW);
77	tdb	1.10
78	tdb	1.3	ServerSocket listenSocket=null;
79	tdb	1.1	// We use this boolean so we can break out of the while loop if we want
80			boolean run = true;
81			try{
82	tdb	1.7	// Work out the port we want
83	tdb	1.11	int listenPort = Integer.parseInt(ConfigurationProxy.getInstance().getProperty("FilterManager." + FilterManager.NAME, "FilterManager.listenPort"));
84	tdb	1.1	// Setup the ServerSocket so that clients can connect
85	tdb	1.12	listenSocket = new ACLServerSocket(acl, listenPort);
86	tdb	1.7	_logger.write(toString(), Logger.SYSMSG, "Server listening on "
87	tdb	1.1	+InetAddress.getLocalHost().getHostName()
88			+"/"+InetAddress.getLocalHost().getHostAddress()
89	tdb	1.3	+" port "+listenSocket.getLocalPort());
90	tdb	1.7
91			}
92			catch(UnknownHostException e){
93	tdb	1.1	_logger.write(toString(), Logger.SYSMSG, "Server listening on UnknownHost "
94	tdb	1.3	+"port "+listenSocket.getLocalPort());
95	tdb	1.1	}
96	tdb	1.7	catch(IOException e){
97			_logger.write(toString(), Logger.FATAL, "IO Error, can't start FilterManager :"+e);
98			run = false;
99			}
100			catch(PropertyNotFoundException e){
101			_logger.write(toString(), Logger.FATAL, "Fatal Error, can't find config :"+e);
102			run = false;
103			}
104			catch(NumberFormatException e){
105			_logger.write(toString(), Logger.FATAL, "Invalid port configuration found :"+e);
106			run = false;
107			}
108
109	tdb	1.1	// Loop round constantly until we decide to stop
110	tdb	1.12	ConfigurationProxy cp = ConfigurationProxy.getInstance();
111			String stringACL = "";
112			String newStringACL = "";
113	tdb	1.1	while(run){
114	tdb	1.12	// get hold of the ACL in the configuration
115			try {
116			newStringACL = cp.getProperty("FilterManager." + FilterManager.NAME, "FilterManager.ACL");
117			}
118			catch(PropertyNotFoundException e) {
119			// if we can't find it, we'll just use a null ACL
120			newStringACL = "";
121			_logger.write(toString(), Logger.WARNING, "No ACL found for FilterManager, using empty ACL instead: " + e);
122			}
123			// check to see if the ACL has changed
124			if(!newStringACL.equals(stringACL)) {
125			_logger.write(toString(), Logger.SYSMSG, "Reloading Access Control List");
126			// clear the ACL
127			acl.clear();
128			// set the default to something sane
129			acl.setDefaultMode(ACL.ALLOW);
130			// add the new ACL (this may change the default)
131			acl.add(newStringACL);
132			stringACL = newStringACL;
133			}
134	tdb	1.1	Socket hostSocket=null;
135			try{
136			_logger.write(toString(), Logger.SYSMSG, "Waiting for Connection");
137			// This will block until a host connects - at which point we get a Socket
138	tdb	1.3	hostSocket = listenSocket.accept();
139	tdb	1.1	_logger.write(toString(), Logger.SYSMSG, "Connection accepted from: " + hostSocket.toString());
140			}
141			catch(IOException e){
142			// Something went wrong with the ServerSocket, so we'll stop listening
143			run=false;
144			}
145			// If we've stopped on the line above we won't want to try this !
146			if(run){
147			try {
148			// Setup the HostInit so it can carry on communications with the host
149	tdb	1.3	HostInit init = new HostInit(hostSocket);
150	tdb	1.1	// and start it
151			init.start();
152			} catch (IOException e) {
153			_logger.write(toString(), Logger.ERROR, e.toString());
154			}
155			}
156			}
157			// Best log the fact that we're stopping
158			_logger.write(toString(), Logger.FATAL, "Fatal error, shutdown pending");
159			}
160
161			/**
162			* Overrides the {@link java.lang.Object#toString() Object.toString()}
163			* method to provide clean logging (every class should have this).
164			*
165	tdb	1.15	* This uses the uk.org.iscream.cms.util.NameFormat class
166	ajm	1.4	* to format the toString()
167			*
168	tdb	1.1	* @return the name of this class and its CVS revision
169			*/
170			public String toString() {
171	ajm	1.4	return FormatName.getName(
172			_name,
173			this.getClass().getName(),
174			REVISION);
175	tdb	1.1	}
176
177			//---PRIVATE METHODS---
178
179			//---ACCESSOR/MUTATOR METHODS---
180
181			//---ATTRIBUTES---
182
183			/**
184	ajm	1.4	* This holds a reference to the
185			* system logger that is being used.
186			*/
187			private Logger _logger = ReferenceManager.getInstance().getLogger();
188
189			/**
190			* This is the friendly identifier of the
191			* component this class is running in.
192			* eg, a Filter may be called "filter1",
193			* If this class does not have an owning
194			* component, a name from the configuration
195			* can be placed here. This name could also
196			* be changed to null for utility classes.
197	tdb	1.1	*/
198	ajm	1.4	private String _name = FilterManager.NAME;
199	tdb	1.1
200			//---STATIC ATTRIBUTES---
201
202			}