server/componentmanager/ComponentManager.java

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

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

/**
 * The component manager is the starting point for all
 * server side components of the iscream system.
 * It loads its initial system configuration from the
 * default properties file, it then starts all the iscream
 * components as specified in the default.properties under
 * uk.ac.ukc.iscream.ComponentList
 *
 * @author  $Author: ajm4 $
 * @version $Id: ComponentManager.java,v 1.5 2000/12/12 20:45:56 ajm4 Exp $
 */
public class ComponentManager {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.5 $";
    
    /**
     * The toString() of this class
     * As it won't be instatiated, this is needed.
     * Not also that we pass a null as the class name (as we are static)
     */
    public static final String toString = FormatName.getName("ComponentManager", null, REVISION);
    
    /**
     * The default location of the properties file for the system
     */
    public static final String DEFAULTPROPERTIES = "./etc/default.properties";
    
//---STATIC METHODS---

    /**
     * The main method which starts the components as
     * listed in the default.properties file.
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        System.out.println("--- I-Scream System Component Manager ---");
        System.out.println("---          Starting System          ---");        
        
        // get the command line args
        // this is a bit messy and should be looked at
        String defaultProperties = DEFAULTPROPERTIES;
        String filterName = null;
        if (args.length > 0) {
            if (args[0].equals("-l")) {
                defaultProperties = args[1];
            } else if (args[0].equals("-f")) {
                filterName = args[1];
            } else if (args[2].equals("-l")) {
                filterName = args[3];
            } else if (args[2].equals("-f")) {
                filterName = args[3];
            } else {
                usage();
            }            
        }

        // load the default properties file into the system properties
        System.out.println(toString + ": initialising - using " + defaultProperties);
        try {
            Properties initProperties = new Properties(System.getProperties());
            initProperties.load(new FileInputStream(new File(defaultProperties)));
            System.setProperties(initProperties);
        } catch (Exception e) {
            System.err.println(toString + ": ERROR " + e.getMessage());
            usage();
        }

        // continue to bring the system up
        System.out.println(toString + ": coming up");
        
        // start the ORB by initialising the ReferenceManager
        ReferenceManager refman = ReferenceManager.getInstance();
        
        // now the ORB is running, we need to activate our RootPOA
        // so that we can start serving requests once servants start up
        refman.activatePOA();
        
        // get the list of components
        String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList");
        StringTokenizer st = new StringTokenizer(componentList, ";");
        
        // this could be done using reflection
        // but..well..we don't ;-p
        while (st.hasMoreTokens()){
            String componentName = st.nextToken();
            Component component = null;
            System.out.println(toString + ": starting component - " + componentName);
            
            // ### This is where the list of supported components is checked! ###
            if (componentName.equalsIgnoreCase("core")) {
                component = new uk.ac.ukc.iscream.core.Core();
            } else if (componentName.equalsIgnoreCase("filtermanager")) {
                component = new uk.ac.ukc.iscream.filtermanager.FilterManager();
            } else if (componentName.equalsIgnoreCase("rootfilter")) {
                component = new uk.ac.ukc.iscream.rootfilter.RootFilter();
            } else if (componentName.equalsIgnoreCase("dbinterface")) {
                component = new uk.ac.ukc.iscream.dbinterface.DBInterface();
            } else if (componentName.equalsIgnoreCase("clientinterface")) {
                component = new uk.ac.ukc.iscream.clientinterface.ClientInterfaceMain();
            }
            // ###  Add new component constructors in the above section! ###
            
            if (component != null) {
                try {
                    component.start();
                } catch (ComponentStartException e) {
                    System.err.println(toString + ": ERROR starting component - " + componentName);
                    System.err.println(toString + ": component reports - " + e.getMessage());
                    System.exit(1);
                }
            } else {
                System.err.println(toString + ": WARNING unsupported component not started");
            }
        }
            System.out.println(toString + ": running");
            
            // block on the ORB...in time, management functionality can be placed here.
        refman.getORB().run();
    }

    /**
     * A simple method to print the usage of this class.
     * It never returns, but instead exits to the system
     * with a value 1, to indicate the system did not start
     * properly.
     */
    public static void usage() {
        System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>");
        System.out.println("WHERE <option>:");
        System.out.println("      -l <filename> - the location of initial system properties");
        System.out.println("                      the default is ./etc/default.properties");
        System.out.println("      -f <name>     - the name of the filter (if there is one configured");
        System.out.println("      -h            - this help screen");
        System.exit(1);
    }

//---CONSTRUCTORS---

//---PUBLIC METHODS---

//---PRIVATE METHODS---

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

//---ATTRIBUTES---
    
//---STATIC ATTRIBUTES---

}
Revision:	1.6
Committed:	Wed Dec 13 12:58:03 2000 UTC (23 years, 5 months ago) by ajm
Branch:	MAIN
Changes since 1.5:	+4 -2 lines
Log Message:	now supports the clientinterface component
#	User	Rev	Content
1	ajm	1.1	//---PACKAGE DECLARATION---
2			package uk.ac.ukc.iscream.componentmanager;
3
4			//---IMPORTS---
5	ajm	1.2	import uk.ac.ukc.iscream.util.*;
6	ajm	1.1	import java.util.*;
7			import java.io.*;
8
9			/**
10	ajm	1.2	* The component manager is the starting point for all
11			* server side components of the iscream system.
12			* It loads its initial system configuration from the
13			* default properties file, it then starts all the iscream
14			* components as specified in the default.properties under
15			* uk.ac.ukc.iscream.ComponentList
16	ajm	1.1	*
17			* @author $Author: ajm4 $
18	ajm	1.6	* @version $Id: ComponentManager.java,v 1.5 2000/12/12 20:45:56 ajm4 Exp $
19	ajm	1.1	*/
20			public class ComponentManager {
21
22			//---FINAL ATTRIBUTES---
23
24			/**
25			* The current CVS revision of this class
26			*/
27	ajm	1.6	public static final String REVISION = "$Revision: 1.5 $";
28	ajm	1.1
29			/**
30			* The toString() of this class
31			* As it won't be instatiated, this is needed.
32	ajm	1.2	* Not also that we pass a null as the class name (as we are static)
33	ajm	1.1	*/
34	ajm	1.2	public static final String toString = FormatName.getName("ComponentManager", null, REVISION);
35	ajm	1.1
36			/**
37			* The default location of the properties file for the system
38			*/
39	ajm	1.2	public static final String DEFAULTPROPERTIES = "./etc/default.properties";
40	ajm	1.1
41			//---STATIC METHODS---
42
43			/**
44	ajm	1.2	* The main method which starts the components as
45			* listed in the default.properties file.
46	ajm	1.1	*
47			* @param args the command line arguments
48			*/
49			public static void main(String[] args) {
50			System.out.println("--- I-Scream System Component Manager ---");
51	ajm	1.2	System.out.println("--- Starting System ---");
52
53	ajm	1.1	// get the command line args
54			// this is a bit messy and should be looked at
55			String defaultProperties = DEFAULTPROPERTIES;
56			String filterName = null;
57			if (args.length > 0) {
58			if (args[0].equals("-l")) {
59			defaultProperties = args[1];
60			} else if (args[0].equals("-f")) {
61			filterName = args[1];
62			} else if (args[2].equals("-l")) {
63			filterName = args[3];
64			} else if (args[2].equals("-f")) {
65			filterName = args[3];
66			} else {
67			usage();
68			}
69			}
70
71			// load the default properties file into the system properties
72			System.out.println(toString + ": initialising - using " + defaultProperties);
73			try {
74			Properties initProperties = new Properties(System.getProperties());
75			initProperties.load(new FileInputStream(new File(defaultProperties)));
76			System.setProperties(initProperties);
77			} catch (Exception e) {
78			System.err.println(toString + ": ERROR " + e.getMessage());
79			usage();
80			}
81
82			// continue to bring the system up
83			System.out.println(toString + ": coming up");
84
85			// start the ORB by initialising the ReferenceManager
86	ajm	1.2	ReferenceManager refman = ReferenceManager.getInstance();
87	ajm	1.1
88	ajm	1.2	// now the ORB is running, we need to activate our RootPOA
89			// so that we can start serving requests once servants start up
90	ajm	1.1	refman.activatePOA();
91
92	ajm	1.2	// get the list of components
93	ajm	1.1	String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList");
94			StringTokenizer st = new StringTokenizer(componentList, ";");
95
96			// this could be done using reflection
97			// but..well..we don't ;-p
98			while (st.hasMoreTokens()){
99			String componentName = st.nextToken();
100			Component component = null;
101			System.out.println(toString + ": starting component - " + componentName);
102	ajm	1.2
103			// ### This is where the list of supported components is checked! ###
104			if (componentName.equalsIgnoreCase("core")) {
105	ajm	1.1	component = new uk.ac.ukc.iscream.core.Core();
106	ajm	1.3	} else if (componentName.equalsIgnoreCase("filtermanager")) {
107			component = new uk.ac.ukc.iscream.filtermanager.FilterManager();
108	ajm	1.4	} else if (componentName.equalsIgnoreCase("rootfilter")) {
109			component = new uk.ac.ukc.iscream.rootfilter.RootFilter();
110	ajm	1.5	} else if (componentName.equalsIgnoreCase("dbinterface")) {
111			component = new uk.ac.ukc.iscream.dbinterface.DBInterface();
112	ajm	1.6	} else if (componentName.equalsIgnoreCase("clientinterface")) {
113			component = new uk.ac.ukc.iscream.clientinterface.ClientInterfaceMain();
114	ajm	1.1	}
115	ajm	1.2	// ### Add new component constructors in the above section! ###
116	ajm	1.3
117	ajm	1.1	if (component != null) {
118	ajm	1.2	try {
119			component.start();
120			} catch (ComponentStartException e) {
121	ajm	1.1	System.err.println(toString + ": ERROR starting component - " + componentName);
122	ajm	1.2	System.err.println(toString + ": component reports - " + e.getMessage());
123	ajm	1.1	System.exit(1);
124			}
125			} else {
126			System.err.println(toString + ": WARNING unsupported component not started");
127			}
128			}
129	ajm	1.3	System.out.println(toString + ": running");
130	ajm	1.2
131			// block on the ORB...in time, management functionality can be placed here.
132	ajm	1.1	refman.getORB().run();
133			}
134	ajm	1.3
135			/**
136	ajm	1.1	* A simple method to print the usage of this class.
137			* It never returns, but instead exits to the system
138			* with a value 1, to indicate the system did not start
139			* properly.
140			*/
141			public static void usage() {
142			System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>");
143			System.out.println("WHERE <option>:");
144			System.out.println(" -l <filename> - the location of initial system properties");
145	ajm	1.2	System.out.println(" the default is ./etc/default.properties");
146	ajm	1.1	System.out.println(" -f <name> - the name of the filter (if there is one configured");
147			System.out.println(" -h - this help screen");
148			System.exit(1);
149			}
150
151			//---CONSTRUCTORS---
152
153			//---PUBLIC METHODS---
154
155			//---PRIVATE METHODS---
156
157			//---ACCESSOR/MUTATOR METHODS---
158
159			//---ATTRIBUTES---
160
161			//---STATIC ATTRIBUTES---
162
163			}