server/core/Core.java

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

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

/**
 * The main class for the CORE of the I-Scream system.
 * This class is the component for CORE I-Scream services
 * namely the Logger and the ConfigurationManager.
 * It registers and starts them, at which point it essentially
 * finishs its role and the started services continue to
 * serve requests from the I-Scream system.
 *
 * @author  $Author: ajm4 $
 * @version $Id: Core.java,v 1.20 2000/12/12 19:56:08 ajm4 Exp $
 */
public class Core implements uk.ac.ukc.iscream.util.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 = "Core";
    
//---STATIC METHODS---

//---CONSTRUCTORS---

//---PUBLIC METHODS---

    /**
     * This method starts the CORE
     * Currently the args are passed direct to the ORB,
     * so any ORB paramaters could go there.
     *
     */
    public void start() throws ComponentStartException {
        // start and bind each server in turn
        
        // work out which logger to use
        String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass");
        String loggerPackage = System.getProperty("uk.ac.ukc.iscream.LoggerPackage");
       
        // construct the relevant LoggerImpl
        LoggerImpl loggerImplRef = null;
        try {
            loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
        } catch (Exception e) {
            // if anything goes wrong we throw a failed start exception
            throw new ComponentStartException("unable to load logging class");
        }

        // setup and bind the LoggerServant
        LoggerServant loggerRef = new LoggerServant(loggerImplRef);
        _refman.bindToOrb(loggerRef, "iscream.Logger");

        // get a reference to the servant as a Logger
        _logger = _refman.getLogger();          
    
        // create the Configurator
        ConfigurationManagerServant configManRef = new ConfigurationManagerServant();
        
        // and advertise it to the naming context
        _refman.bindToOrb(configManRef, "iscream.ConfigurationManager");

        _logger.write(toString(), Logger.SYSINIT, "started");
    }
    
    /**
     * 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 = Core.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:	Thu Jan 18 23:09:56 2001 UTC (23 years, 4 months ago) by tdb
Branch:	MAIN
Changes since 1.20:	+3 -2 lines
Log Message:	Changes to reflect move of Component, ComponentStartException, and the ReferenceManager from util to componentmanager.
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.ac.ukc.iscream.core;
3
4	//---IMPORTS---
5	import uk.ac.ukc.iscream.util.*;
6	import uk.ac.ukc.iscream.componentmanager.*;
7
8	/**
9	* The main class for the CORE of the I-Scream system.
10	* This class is the component for CORE I-Scream services
11	* namely the Logger and the ConfigurationManager.
12	* It registers and starts them, at which point it essentially
13	* finishs its role and the started services continue to
14	* serve requests from the I-Scream system.
15	*
16	* @author $Author: ajm4 $
17	* @version $Id: Core.java,v 1.20 2000/12/12 19:56:08 ajm4 Exp $
18	*/
19	public class Core implements uk.ac.ukc.iscream.util.Component {
20
21	//---FINAL ATTRIBUTES---
22
23	/**
24	* The current CVS revision of this class
25	*/
26	public static final String REVISION = "$Revision: 1.20 $";
27
28	/**
29	* The friendly name for this component, used by
30	* all related classes.
31	*/
32	public static final String NAME = "Core";
33
34	//---STATIC METHODS---
35
36	//---CONSTRUCTORS---
37
38	//---PUBLIC METHODS---
39
40	/**
41	* This method starts the CORE
42	* Currently the args are passed direct to the ORB,
43	* so any ORB paramaters could go there.
44	*
45	*/
46	public void start() throws ComponentStartException {
47	// start and bind each server in turn
48
49	// work out which logger to use
50	String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass");
51	String loggerPackage = System.getProperty("uk.ac.ukc.iscream.LoggerPackage");
52
53	// construct the relevant LoggerImpl
54	LoggerImpl loggerImplRef = null;
55	try {
56	loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(loggerPackage + "." + whichLogger).newInstance();
57	} catch (Exception e) {
58	// if anything goes wrong we throw a failed start exception
59	throw new ComponentStartException("unable to load logging class");
60	}
61
62	// setup and bind the LoggerServant
63	LoggerServant loggerRef = new LoggerServant(loggerImplRef);
64	_refman.bindToOrb(loggerRef, "iscream.Logger");
65
66	// get a reference to the servant as a Logger
67	_logger = _refman.getLogger();
68
69	// create the Configurator
70	ConfigurationManagerServant configManRef = new ConfigurationManagerServant();
71
72	// and advertise it to the naming context
73	_refman.bindToOrb(configManRef, "iscream.ConfigurationManager");
74
75	_logger.write(toString(), Logger.SYSINIT, "started");
76	}
77
78	/**
79	* Overrides the {@link java.lang.Object#toString() Object.toString()}
80	* method to provide clean logging (every class should have this).
81	*
82	* This uses the uk.ac.ukc.iscream.util.NameFormat class
83	* to format the toString()
84	*
85	* @return the name of this class and its CVS revision
86	*/
87	public String toString() {
88	return FormatName.getName(
89	_name,
90	getClass().getName(),
91	REVISION);
92	}
93
94	//---PRIVATE METHODS---
95
96	//---ACCESSOR/MUTATOR METHODS---
97
98	//---ATTRIBUTES---
99
100	/**
101	* This is the friendly identifier of the
102	* component this class is running in.
103	* eg, a Filter may be called "filter1",
104	* If this class does not have an owning
105	* component, a name from the configuration
106	* can be placed here. This name could also
107	* be changed to null for utility classes.
108	*/
109	private String _name = Core.NAME;
110
111	/**
112	* This holds a reference to the
113	* system logger that is being used.
114	*/
115	private Logger _logger;
116
117	/**
118	* A reference to the reference manager in use
119	*/
120	private ReferenceManager _refman = ReferenceManager.getInstance();
121
122	//---STATIC ATTRIBUTES---
123
124	}