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: tdb1 $
 * @version $Id: ComponentManager.java,v 1.12 2001/01/28 05:49:18 tdb1 Exp $
 */
public class ComponentManager {

//---FINAL ATTRIBUTES---

    /**
     * The current CVS revision of this class
     */
    public static final String REVISION = "$Revision: 1.12 $";
    
    /**
     * 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;
        
        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 - " + componentName);
                    System.err.println(toString + ": component reports - " + e.getMessage());
                    System.exit(1);
                } catch(ComponentCORBAExcetpion 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");
                Thread.sleep(5000);
            } 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:	1.13
Committed:	Fri Feb 23 16:26:14 2001 UTC (23 years, 3 months ago) by ajm
Branch:	MAIN
Changes since 1.12:	+33 -6 lines
Log Message:	initial support for CORBA retries
#	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	tdb	1.10	import uk.ac.ukc.iscream.util.*;
8	ajm	1.1
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	tdb	1.9	* @author $Author: tdb1 $
18	ajm	1.13	* @version $Id: ComponentManager.java,v 1.12 2001/01/28 05:49:18 tdb1 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	1.13	public static final String REVISION = "$Revision: 1.12 $";
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	tdb	1.11	System.out.println("--- i-scream Server Component Manager ---");
51	ajm	1.2	System.out.println("--- Starting System ---");
52
53	ajm	1.1	// get the command line args
54			String defaultProperties = DEFAULTPROPERTIES;
55			String filterName = null;
56	tdb	1.11	for(int i=0; i < args.length; i++) {
57	tdb	1.12	if(args[i].equals("-h")) {
58	ajm	1.1	usage();
59	tdb	1.11	}
60	tdb	1.12	else if(args[i].equals("-f")) {
61	tdb	1.11	i++; filterName = args[i];
62			}
63	tdb	1.12	else if(args[i].equals("-l")) {
64	tdb	1.11	i++; defaultProperties = args[i];
65			}
66			else {
67			usage();
68			}
69	ajm	1.1	}
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	ajm	1.13
97			ArrayList componentsToStart = new ArrayList();
98
99	ajm	1.1	// 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	ajm	1.13
105	ajm	1.2
106			// ### This is where the list of supported components is checked! ###
107			if (componentName.equalsIgnoreCase("core")) {
108	ajm	1.1	component = new uk.ac.ukc.iscream.core.Core();
109	ajm	1.3	} else if (componentName.equalsIgnoreCase("filtermanager")) {
110			component = new uk.ac.ukc.iscream.filtermanager.FilterManager();
111	ajm	1.4	} else if (componentName.equalsIgnoreCase("rootfilter")) {
112			component = new uk.ac.ukc.iscream.rootfilter.RootFilter();
113	ajm	1.5	} else if (componentName.equalsIgnoreCase("dbinterface")) {
114			component = new uk.ac.ukc.iscream.dbinterface.DBInterface();
115	ajm	1.6	} else if (componentName.equalsIgnoreCase("clientinterface")) {
116			component = new uk.ac.ukc.iscream.clientinterface.ClientInterfaceMain();
117	ajm	1.7	// 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	ajm	1.1	}
121	ajm	1.2	// ### Add new component constructors in the above section! ###
122	ajm	1.3
123	ajm	1.1	if (component != null) {
124	ajm	1.13	componentsToStart.add(component);
125			} else {
126			System.err.println(toString + ": WARNING unsupported component not started");
127			}
128			}
129
130			boolean tryAgain = true;
131
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	ajm	1.2	component.start();
139	ajm	1.13	componentsToStart.remove(componentsToStart.indexOf(component));
140	ajm	1.2	} catch (ComponentStartException e) {
141	ajm	1.1	System.err.println(toString + ": ERROR starting component - " + componentName);
142	ajm	1.2	System.err.println(toString + ": component reports - " + e.getMessage());
143	ajm	1.1	System.exit(1);
144	ajm	1.13	} catch(ComponentCORBAExcetpion 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	ajm	1.1	}
149	ajm	1.13	}
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			Thread.sleep(5000);
154	ajm	1.1	} else {
155	ajm	1.13	tryAgain = false;
156	ajm	1.1	}
157			}
158	ajm	1.13
159	ajm	1.3	System.out.println(toString + ": running");
160	ajm	1.13
161	ajm	1.2	// block on the ORB...in time, management functionality can be placed here.
162	ajm	1.1	refman.getORB().run();
163			}
164	ajm	1.3
165			/**
166	ajm	1.1	* A simple method to print the usage of this class.
167			* It never returns, but instead exits to the system
168			* with a value 1, to indicate the system did not start
169			* properly.
170			*/
171			public static void usage() {
172			System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>");
173	tdb	1.8	System.out.println(" or: java -jar iscream.jar <option>");
174	ajm	1.1	System.out.println("WHERE <option>:");
175			System.out.println(" -l <filename> - the location of initial system properties");
176	ajm	1.2	System.out.println(" the default is ./etc/default.properties");
177	ajm	1.1	System.out.println(" -f <name> - the name of the filter (if there is one configured");
178			System.out.println(" -h - this help screen");
179			System.exit(1);
180			}
181
182			//---CONSTRUCTORS---
183
184			//---PUBLIC METHODS---
185
186			//---PRIVATE METHODS---
187
188			//---ACCESSOR/MUTATOR METHODS---
189
190			//---ATTRIBUTES---
191
192			//---STATIC ATTRIBUTES---
193
194			}