server/filtermanager/FilterManager.java

//---PACKAGE DECLARATION---
package uk.ac.ukc.iscream.filtermanager;

//---IMPORTS---
import uk.ac.ukc.iscream.util.*;
import uk.ac.ukc.iscream.core.*;
import uk.ac.ukc.iscream.componentmanager.*;

/**
 * The FilterManager handles initialisation
 * of hosts with the system, allowing hosts to
 * gain their configuration and a hook to a Filter 
 * to talk to.
 *
 * @author  $Author: tdb1 $
 * @version $Id: FilterManager.java,v 1.20 2001/03/14 01:43:53 tdb1 Exp $
 */
public class FilterManager implements Component {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.20 $";
    
    /**
     * The friendly name for this component, used by
     * all related classes.
     */
    public static final String NAME = "FilterManager";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

//---PUBLIC METHODS---

    /**
     * This method starts the FilterManager
     */
     public void start() throws ComponentStartException {
        // get references to key objects
        _logger = _refman.getLogger();
        
        _logger.write(toString(), Logger.SYSINIT, "coming up");
        
        // startup a thread to listen for hosts
        HostListener hostListener = new HostListener();
        hostListener.start();
        
        _logger.write(toString(), Logger.SYSINIT, "started");
    }
    
    /**
     * Does a dependency check. Used mainly at startup to
     * see if the required dependencies (components) are up
     * and running.
     *
     * @return a boolean value, true if the depdencies are satisfied
     */
    public boolean depCheck() {
        // This also depends on Filters.. but only when requested.
        // I believe the code is in place to handle that elsewhere.
        try {
            org.omg.CORBA.Object obj;
            obj = _refman.getCORBARef("iscream.Logger");
            obj = _refman.getCORBARef("iscream.ConfigurationManager");
        } catch(ComponentCORBAException e) {
            System.err.println(toString() + ": Dependency Failure: "+e);
            return false;
        }
        // dependency check suceeded
        return true;
    }
    
    /**
     * Overrides the {@link java.lang.Object#toString() Object.toString()}
     * method to provide clean logging (every class should have this).
     *
     * This uses the uk.ac.ukc.iscream.util.NameFormat class
     * to format the toString()
     *
     * @return the name of this class and its CVS revision
     */
    public String toString() {
        return FormatName.getName(
            _name,
            getClass().getName(),
            REVISION);
    }

//---PRIVATE METHODS---

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

//---ATTRIBUTES---

    /**
     * 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;

    /**
     * This holds a reference to the
     * system logger that is being used.
     */
    private Logger _logger;
    
    /**
     * A reference to the reference manager in use
     */
    private ReferenceManager _refman = ReferenceManager.getInstance();

//---STATIC ATTRIBUTES---

}            
Revision:	1.21
Committed:	Wed Mar 14 02:01:19 2001 UTC (23 years, 2 months ago) by tdb
Branch:	MAIN
Changes since 1.20:	+13 -5 lines
Log Message:	Of course, this class doesn't depend on any Filters at startup... so there is no transitive dependency to the Core.
#	User	Rev	Content
1	tdb	1.1	//---PACKAGE DECLARATION---
2	tdb	1.9	package uk.ac.ukc.iscream.filtermanager;
3	tdb	1.1
4			//---IMPORTS---
5	ajm	1.12	import uk.ac.ukc.iscream.util.*;
6	tdb	1.1	import uk.ac.ukc.iscream.core.*;
7	tdb	1.14	import uk.ac.ukc.iscream.componentmanager.*;
8	tdb	1.1
9			/**
10	ajm	1.12	* The FilterManager handles initialisation
11			* of hosts with the system, allowing hosts to
12			* gain their configuration and a hook to a Filter
13			* to talk to.
14	tdb	1.1	*
15	tdb	1.19	* @author $Author: tdb1 $
16	tdb	1.21	* @version $Id: FilterManager.java,v 1.20 2001/03/14 01:43:53 tdb1 Exp $
17	tdb	1.1	*/
18	tdb	1.14	public class FilterManager implements Component {
19	tdb	1.1
20			//---FINAL ATTRIBUTES---
21
22			/**
23			* The current CVS revision of this class
24			*/
25	tdb	1.21	public static final String REVISION = "$Revision: 1.20 $";
26	ajm	1.12
27			/**
28	ajm	1.13	* The friendly name for this component, used by
29	ajm	1.12	* all related classes.
30			*/
31			public static final String NAME = "FilterManager";
32	tdb	1.1
33			//---STATIC METHODS---
34
35	ajm	1.12	//---CONSTRUCTORS---
36
37			//---PUBLIC METHODS---
38
39			/**
40			* This method starts the FilterManager
41			*/
42			public void start() throws ComponentStartException {
43	ajm	1.17	// get references to key objects
44	tdb	1.20	_logger = _refman.getLogger();
45	ajm	1.17
46	ajm	1.12	_logger.write(toString(), Logger.SYSINIT, "coming up");
47	tdb	1.10
48	tdb	1.15	// startup a thread to listen for hosts
49	tdb	1.18	HostListener hostListener = new HostListener();
50	tdb	1.10	hostListener.start();
51
52	ajm	1.12	_logger.write(toString(), Logger.SYSINIT, "started");
53	tdb	1.1	}
54	tdb	1.19
55			/**
56			* Does a dependency check. Used mainly at startup to
57			* see if the required dependencies (components) are up
58			* and running.
59			*
60			* @return a boolean value, true if the depdencies are satisfied
61			*/
62			public boolean depCheck() {
63	tdb	1.21	// This also depends on Filters.. but only when requested.
64			// I believe the code is in place to handle that elsewhere.
65			try {
66			org.omg.CORBA.Object obj;
67			obj = _refman.getCORBARef("iscream.Logger");
68			obj = _refman.getCORBARef("iscream.ConfigurationManager");
69			} catch(ComponentCORBAException e) {
70			System.err.println(toString() + ": Dependency Failure: "+e);
71			return false;
72			}
73			// dependency check suceeded
74	tdb	1.19	return true;
75			}
76
77	ajm	1.12	/**
78			* Overrides the {@link java.lang.Object#toString() Object.toString()}
79			* method to provide clean logging (every class should have this).
80			*
81			* This uses the uk.ac.ukc.iscream.util.NameFormat class
82			* to format the toString()
83			*
84			* @return the name of this class and its CVS revision
85			*/
86			public String toString() {
87			return FormatName.getName(
88			_name,
89	ajm	1.13	getClass().getName(),
90	ajm	1.12	REVISION);
91			}
92	tdb	1.1
93			//---PRIVATE METHODS---
94
95			//---ACCESSOR/MUTATOR METHODS---
96
97			//---ATTRIBUTES---
98	ajm	1.12
99			/**
100			* This is the friendly identifier of the
101			* component this class is running in.
102			* eg, a Filter may be called "filter1",
103			* If this class does not have an owning
104			* component, a name from the configuration
105			* can be placed here. This name could also
106			* be changed to null for utility classes.
107			*/
108			private String _name = FilterManager.NAME;
109
110			/**
111			* This holds a reference to the
112			* system logger that is being used.
113			*/
114	ajm	1.17	private Logger _logger;
115	tdb	1.20
116			/**
117			* A reference to the reference manager in use
118			*/
119			private ReferenceManager _refman = ReferenceManager.getInstance();
120	tdb	1.1
121			//---STATIC ATTRIBUTES---
122
123			}