server/componentmanager/ComponentManager.java

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

//---IMPORTS---
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: tdb1 $
 * @version $Id: ComponentManager.java,v 1.8 2001/01/08 13:07:48 tdb1 Exp $
 */
public class ComponentManager {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.8 $";
    
    /**
     * 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();
            // note the passing of the Filter's name in its constructor
            } else if (componentName.equalsIgnoreCase("filter")) {
                component = new uk.ac.ukc.iscream.filter.FilterMain(filterName);
            }
            // ###  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("   or: java -jar iscream.jar <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:	1.9
Committed:	Thu Jan 18 23:01:50 2001 UTC (23 years, 4 months ago) by tdb
Branch:	MAIN
Changes since 1.8:	+3 -4 lines
Log Message:	Changes to reflect move of Component, ComponentStartException, and the ReferenceManager from util to componentmanager.
#	User	Rev	Content
1	ajm	1.1	//---PACKAGE DECLARATION---
2			package uk.ac.ukc.iscream.componentmanager;
3
4			//---IMPORTS---
5			import java.util.*;
6			import java.io.*;
7
8			/**
9	ajm	1.2	* The component manager is the starting point for all
10			* server side components of the iscream system.
11			* It loads its initial system configuration from the
12			* default properties file, it then starts all the iscream
13			* components as specified in the default.properties under
14			* uk.ac.ukc.iscream.ComponentList
15	ajm	1.1	*
16	tdb	1.9	* @author $Author: tdb1 $
17			* @version $Id: ComponentManager.java,v 1.8 2001/01/08 13:07:48 tdb1 Exp $
18	ajm	1.1	*/
19			public class ComponentManager {
20
21			//---FINAL ATTRIBUTES---
22
23			/**
24			* The current CVS revision of this class
25			*/
26	tdb	1.9	public static final String REVISION = "$Revision: 1.8 $";
27	ajm	1.1
28			/**
29			* The toString() of this class
30			* As it won't be instatiated, this is needed.
31	ajm	1.2	* Not also that we pass a null as the class name (as we are static)
32	ajm	1.1	*/
33	ajm	1.2	public static final String toString = FormatName.getName("ComponentManager", null, REVISION);
34	ajm	1.1
35			/**
36			* The default location of the properties file for the system
37			*/
38	ajm	1.2	public static final String DEFAULTPROPERTIES = "./etc/default.properties";
39	ajm	1.1
40			//---STATIC METHODS---
41
42			/**
43	ajm	1.2	* The main method which starts the components as
44			* listed in the default.properties file.
45	ajm	1.1	*
46			* @param args the command line arguments
47			*/
48			public static void main(String[] args) {
49			System.out.println("--- I-Scream System Component Manager ---");
50	ajm	1.2	System.out.println("--- Starting System ---");
51
52	ajm	1.1	// get the command line args
53			// this is a bit messy and should be looked at
54			String defaultProperties = DEFAULTPROPERTIES;
55			String filterName = null;
56			if (args.length > 0) {
57			if (args[0].equals("-l")) {
58			defaultProperties = args[1];
59			} else if (args[0].equals("-f")) {
60			filterName = args[1];
61			} else if (args[2].equals("-l")) {
62			filterName = args[3];
63			} else if (args[2].equals("-f")) {
64			filterName = args[3];
65			} else {
66			usage();
67			}
68			}
69
70			// load the default properties file into the system properties
71			System.out.println(toString + ": initialising - using " + defaultProperties);
72			try {
73			Properties initProperties = new Properties(System.getProperties());
74			initProperties.load(new FileInputStream(new File(defaultProperties)));
75			System.setProperties(initProperties);
76			} catch (Exception e) {
77			System.err.println(toString + ": ERROR " + e.getMessage());
78			usage();
79			}
80
81			// continue to bring the system up
82			System.out.println(toString + ": coming up");
83
84			// start the ORB by initialising the ReferenceManager
85	ajm	1.2	ReferenceManager refman = ReferenceManager.getInstance();
86	ajm	1.1
87	ajm	1.2	// now the ORB is running, we need to activate our RootPOA
88			// so that we can start serving requests once servants start up
89	ajm	1.1	refman.activatePOA();
90
91	ajm	1.2	// get the list of components
92	ajm	1.1	String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList");
93			StringTokenizer st = new StringTokenizer(componentList, ";");
94
95			// this could be done using reflection
96			// but..well..we don't ;-p
97			while (st.hasMoreTokens()){
98			String componentName = st.nextToken();
99			Component component = null;
100			System.out.println(toString + ": starting component - " + componentName);
101	ajm	1.2
102			// ### This is where the list of supported components is checked! ###
103			if (componentName.equalsIgnoreCase("core")) {
104	ajm	1.1	component = new uk.ac.ukc.iscream.core.Core();
105	ajm	1.3	} else if (componentName.equalsIgnoreCase("filtermanager")) {
106			component = new uk.ac.ukc.iscream.filtermanager.FilterManager();
107	ajm	1.4	} else if (componentName.equalsIgnoreCase("rootfilter")) {
108			component = new uk.ac.ukc.iscream.rootfilter.RootFilter();
109	ajm	1.5	} else if (componentName.equalsIgnoreCase("dbinterface")) {
110			component = new uk.ac.ukc.iscream.dbinterface.DBInterface();
111	ajm	1.6	} else if (componentName.equalsIgnoreCase("clientinterface")) {
112			component = new uk.ac.ukc.iscream.clientinterface.ClientInterfaceMain();
113	ajm	1.7	// note the passing of the Filter's name in its constructor
114			} else if (componentName.equalsIgnoreCase("filter")) {
115			component = new uk.ac.ukc.iscream.filter.FilterMain(filterName);
116	ajm	1.1	}
117	ajm	1.2	// ### Add new component constructors in the above section! ###
118	ajm	1.3
119	ajm	1.1	if (component != null) {
120	ajm	1.2	try {
121			component.start();
122			} catch (ComponentStartException e) {
123	ajm	1.1	System.err.println(toString + ": ERROR starting component - " + componentName);
124	ajm	1.2	System.err.println(toString + ": component reports - " + e.getMessage());
125	ajm	1.1	System.exit(1);
126			}
127			} else {
128			System.err.println(toString + ": WARNING unsupported component not started");
129			}
130			}
131	ajm	1.3	System.out.println(toString + ": running");
132	ajm	1.2
133			// block on the ORB...in time, management functionality can be placed here.
134	ajm	1.1	refman.getORB().run();
135			}
136	ajm	1.3
137			/**
138	ajm	1.1	* A simple method to print the usage of this class.
139			* It never returns, but instead exits to the system
140			* with a value 1, to indicate the system did not start
141			* properly.
142			*/
143			public static void usage() {
144			System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>");
145	tdb	1.8	System.out.println(" or: java -jar iscream.jar <option>");
146	ajm	1.1	System.out.println("WHERE <option>:");
147			System.out.println(" -l <filename> - the location of initial system properties");
148	ajm	1.2	System.out.println(" the default is ./etc/default.properties");
149	ajm	1.1	System.out.println(" -f <name> - the name of the filter (if there is one configured");
150			System.out.println(" -h - this help screen");
151			System.exit(1);
152			}
153
154			//---CONSTRUCTORS---
155
156			//---PUBLIC METHODS---
157
158			//---PRIVATE METHODS---
159
160			//---ACCESSOR/MUTATOR METHODS---
161
162			//---ATTRIBUTES---
163
164			//---STATIC ATTRIBUTES---
165
166			}