server/componentmanager/ComponentManager.java

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

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

/**
 * 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 1.17 2001/02/23 16:36:38 ajm4 Exp $
 */
public class ComponentManager {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.17 $";
    
    /**
     * 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 Server Component Manager ---");
        System.out.println("---          Starting System          ---");        
        
        // get the command line args
        String defaultProperties = DEFAULTPROPERTIES;
        String filterName = null;
        for(int i=0; i < args.length; i++) {
            if(args[i].equals("-h")) {
                usage();
            }
            else if(args[i].equals("-f")) {
                i++; filterName = args[i];
            }
            else if(args[i].equals("-l")) {
                i++; defaultProperties = args[i];
            }
            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, ";");
        

        ArrayList componentsToStart = new ArrayList();
        
        // this could be done using reflection
        // but..well..we don't ;-p
        while (st.hasMoreTokens()){
            String componentName = st.nextToken();
            Component component = null;
            
            
            // ### 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) {
                componentsToStart.add(component);    
            } else {
                System.err.println(toString + ": WARNING unsupported component not started");
            }
        }
        
        boolean tryAgain = true;
        Component component = null;
        while(tryAgain) {
            Iterator i = componentsToStart.iterator();
            while(i.hasNext()) {
                try {
                    component = (Component) i.next();
                    System.out.println(toString + ": starting component - " + component.toString());
                    component.start();
                    componentsToStart.remove(componentsToStart.indexOf(component));
                } catch (ComponentStartException e) {
                    System.err.println(toString + ": ERROR starting component - " + component.toString());
                    System.err.println(toString + ": component reports - " + e.getMessage());
                    System.exit(1);
                } catch(ComponentCORBAException e2) {
                    System.err.println(toString + ": WARNING Component reported CORBA communications failure");
                    System.err.println(toString + ": This could be because it can't communicate with components it needs.");
                    System.err.println(toString + ": component reports - " + e2.getMessage());
                }
            }
            if (componentsToStart.size() > 0) {
                System.err.println(toString + ": WARNING One or more components failed to start correctly.");
                System.err.println(toString + ": Will try again in 5 seconds");
                try {    
                    Thread.sleep(5000);
                } catch (InterruptedException e) {
                    // we're not bothered
                }
            } else {
                tryAgain = false;
            }
        }
                
            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:	1.18
Committed:	Fri Feb 23 16:38:03 2001 UTC (23 years, 2 months ago) by ajm
Branch:	MAIN
Changes since 1.17:	+6 -6 lines
Log Message:	bug fixes
#	Content
1	//---PACKAGE DECLARATION---
2	package uk.ac.ukc.iscream.componentmanager;
3
4	//---IMPORTS---
5	import java.util.*;
6	import java.io.*;
7	import uk.ac.ukc.iscream.util.*;
8
9	/**
10	* 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	*
17	* @author $Author: ajm4 $
18	* @version $Id: ComponentManager.java,v 1.17 2001/02/23 16:36:38 ajm4 Exp $
19	*/
20	public class ComponentManager {
21
22	//---FINAL ATTRIBUTES---
23
24	/**
25	* The current CVS revision of this class
26	*/
27	public static final String REVISION = "$Revision: 1.17 $";
28
29	/**
30	* The toString() of this class
31	* As it won't be instatiated, this is needed.
32	* Not also that we pass a null as the class name (as we are static)
33	*/
34	public static final String toString = FormatName.getName("ComponentManager", null, REVISION);
35
36	/**
37	* The default location of the properties file for the system
38	*/
39	public static final String DEFAULTPROPERTIES = "./etc/default.properties";
40
41	//---STATIC METHODS---
42
43	/**
44	* The main method which starts the components as
45	* listed in the default.properties file.
46	*
47	* @param args the command line arguments
48	*/
49	public static void main(String[] args) {
50	System.out.println("--- i-scream Server Component Manager ---");
51	System.out.println("--- Starting System ---");
52
53	// get the command line args
54	String defaultProperties = DEFAULTPROPERTIES;
55	String filterName = null;
56	for(int i=0; i < args.length; i++) {
57	if(args[i].equals("-h")) {
58	usage();
59	}
60	else if(args[i].equals("-f")) {
61	i++; filterName = args[i];
62	}
63	else if(args[i].equals("-l")) {
64	i++; defaultProperties = args[i];
65	}
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	ReferenceManager refman = ReferenceManager.getInstance();
87
88	// now the ORB is running, we need to activate our RootPOA
89	// so that we can start serving requests once servants start up
90	refman.activatePOA();
91
92	// get the list of components
93	String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList");
94	StringTokenizer st = new StringTokenizer(componentList, ";");
95
96
97	ArrayList componentsToStart = new ArrayList();
98
99	// this could be done using reflection
100	// but..well..we don't ;-p
101	while (st.hasMoreTokens()){
102	String componentName = st.nextToken();
103	Component component = null;
104
105
106	// ### This is where the list of supported components is checked! ###
107	if (componentName.equalsIgnoreCase("core")) {
108	component = new uk.ac.ukc.iscream.core.Core();
109	} else if (componentName.equalsIgnoreCase("filtermanager")) {
110	component = new uk.ac.ukc.iscream.filtermanager.FilterManager();
111	} else if (componentName.equalsIgnoreCase("rootfilter")) {
112	component = new uk.ac.ukc.iscream.rootfilter.RootFilter();
113	} else if (componentName.equalsIgnoreCase("dbinterface")) {
114	component = new uk.ac.ukc.iscream.dbinterface.DBInterface();
115	} else if (componentName.equalsIgnoreCase("clientinterface")) {
116	component = new uk.ac.ukc.iscream.clientinterface.ClientInterfaceMain();
117	// note the passing of the Filter's name in its constructor
118	} else if (componentName.equalsIgnoreCase("filter")) {
119	component = new uk.ac.ukc.iscream.filter.FilterMain(filterName);
120	}
121	// ### Add new component constructors in the above section! ###
122
123	if (component != null) {
124	componentsToStart.add(component);
125	} else {
126	System.err.println(toString + ": WARNING unsupported component not started");
127	}
128	}
129
130	boolean tryAgain = true;
131	Component component = null;
132	while(tryAgain) {
133	Iterator i = componentsToStart.iterator();
134	while(i.hasNext()) {
135	try {
136	component = (Component) i.next();
137	System.out.println(toString + ": starting component - " + component.toString());
138	component.start();
139	componentsToStart.remove(componentsToStart.indexOf(component));
140	} catch (ComponentStartException e) {
141	System.err.println(toString + ": ERROR starting component - " + component.toString());
142	System.err.println(toString + ": component reports - " + e.getMessage());
143	System.exit(1);
144	} catch(ComponentCORBAException e2) {
145	System.err.println(toString + ": WARNING Component reported CORBA communications failure");
146	System.err.println(toString + ": This could be because it can't communicate with components it needs.");
147	System.err.println(toString + ": component reports - " + e2.getMessage());
148	}
149	}
150	if (componentsToStart.size() > 0) {
151	System.err.println(toString + ": WARNING One or more components failed to start correctly.");
152	System.err.println(toString + ": Will try again in 5 seconds");
153	try {
154	Thread.sleep(5000);
155	} catch (InterruptedException e) {
156	// we're not bothered
157	}
158	} else {
159	tryAgain = false;
160	}
161	}
162
163	System.out.println(toString + ": running");
164
165	// block on the ORB...in time, management functionality can be placed here.
166	refman.getORB().run();
167	}
168
169	/**
170	* A simple method to print the usage of this class.
171	* It never returns, but instead exits to the system
172	* with a value 1, to indicate the system did not start
173	* properly.
174	*/
175	public static void usage() {
176	System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>");
177	System.out.println(" or: java -jar iscream.jar <option>");
178	System.out.println("WHERE <option>:");
179	System.out.println(" -l <filename> - the location of initial system properties");
180	System.out.println(" the default is ./etc/default.properties");
181	System.out.println(" -f <name> - the name of the filter (if there is one configured");
182	System.out.println(" -h - this help screen");
183	System.exit(1);
184	}
185
186	//---CONSTRUCTORS---
187
188	//---PUBLIC METHODS---
189
190	//---PRIVATE METHODS---
191
192	//---ACCESSOR/MUTATOR METHODS---
193
194	//---ATTRIBUTES---
195
196	//---STATIC ATTRIBUTES---
197
198	}