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//---PACKAGE DECLARATION--- |
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package uk.ac.ukc.iscream.componentmanager; |
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|
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//---IMPORTS--- |
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import uk.ac.ukc.iscream.util.*; |
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import java.util.*; |
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import java.io.*; |
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|
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/** |
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* The component manager is the starting point for all |
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* server side components of the iscream system. |
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* It loads its initial system configuration from the |
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* default properties file, it then starts all the iscream |
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* components as specified in the default.properties under |
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* uk.ac.ukc.iscream.ComponentList |
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* |
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* @author $Author: ajm4 $ |
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* @version $Id: ComponentManager.java,v 1.7 2000/12/13 13:37:45 ajm4 Exp $ |
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*/ |
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public class ComponentManager { |
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|
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//---FINAL ATTRIBUTES--- |
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|
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/** |
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* The current CVS revision of this class |
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*/ |
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public static final String REVISION = "$Revision: 1.7 $"; |
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|
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/** |
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* The toString() of this class |
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* As it won't be instatiated, this is needed. |
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* Not also that we pass a null as the class name (as we are static) |
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*/ |
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public static final String toString = FormatName.getName("ComponentManager", null, REVISION); |
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|
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/** |
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* The default location of the properties file for the system |
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*/ |
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public static final String DEFAULTPROPERTIES = "./etc/default.properties"; |
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|
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//---STATIC METHODS--- |
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|
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/** |
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* The main method which starts the components as |
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* listed in the default.properties file. |
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* |
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* @param args the command line arguments |
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*/ |
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public static void main(String[] args) { |
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System.out.println("--- I-Scream System Component Manager ---"); |
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System.out.println("--- Starting System ---"); |
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|
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// get the command line args |
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// this is a bit messy and should be looked at |
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String defaultProperties = DEFAULTPROPERTIES; |
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String filterName = null; |
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if (args.length > 0) { |
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if (args[0].equals("-l")) { |
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defaultProperties = args[1]; |
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} else if (args[0].equals("-f")) { |
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filterName = args[1]; |
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} else if (args[2].equals("-l")) { |
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filterName = args[3]; |
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} else if (args[2].equals("-f")) { |
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filterName = args[3]; |
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} else { |
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usage(); |
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} |
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} |
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|
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// load the default properties file into the system properties |
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System.out.println(toString + ": initialising - using " + defaultProperties); |
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try { |
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Properties initProperties = new Properties(System.getProperties()); |
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initProperties.load(new FileInputStream(new File(defaultProperties))); |
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System.setProperties(initProperties); |
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} catch (Exception e) { |
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System.err.println(toString + ": ERROR " + e.getMessage()); |
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usage(); |
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} |
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|
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// continue to bring the system up |
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System.out.println(toString + ": coming up"); |
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|
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// start the ORB by initialising the ReferenceManager |
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ReferenceManager refman = ReferenceManager.getInstance(); |
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|
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// now the ORB is running, we need to activate our RootPOA |
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// so that we can start serving requests once servants start up |
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refman.activatePOA(); |
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|
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// get the list of components |
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String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList"); |
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StringTokenizer st = new StringTokenizer(componentList, ";"); |
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|
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// this could be done using reflection |
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// but..well..we don't ;-p |
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while (st.hasMoreTokens()){ |
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String componentName = st.nextToken(); |
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Component component = null; |
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System.out.println(toString + ": starting component - " + componentName); |
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|
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// ### This is where the list of supported components is checked! ### |
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if (componentName.equalsIgnoreCase("core")) { |
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component = new uk.ac.ukc.iscream.core.Core(); |
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} else if (componentName.equalsIgnoreCase("filtermanager")) { |
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component = new uk.ac.ukc.iscream.filtermanager.FilterManager(); |
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} else if (componentName.equalsIgnoreCase("rootfilter")) { |
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component = new uk.ac.ukc.iscream.rootfilter.RootFilter(); |
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} else if (componentName.equalsIgnoreCase("dbinterface")) { |
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component = new uk.ac.ukc.iscream.dbinterface.DBInterface(); |
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} else if (componentName.equalsIgnoreCase("clientinterface")) { |
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component = new uk.ac.ukc.iscream.clientinterface.ClientInterfaceMain(); |
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// note the passing of the Filter's name in its constructor |
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} else if (componentName.equalsIgnoreCase("filter")) { |
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component = new uk.ac.ukc.iscream.filter.FilterMain(filterName); |
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} |
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// ### Add new component constructors in the above section! ### |
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|
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if (component != null) { |
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try { |
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component.start(); |
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} catch (ComponentStartException e) { |
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System.err.println(toString + ": ERROR starting component - " + componentName); |
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System.err.println(toString + ": component reports - " + e.getMessage()); |
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System.exit(1); |
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} |
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} else { |
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System.err.println(toString + ": WARNING unsupported component not started"); |
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} |
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} |
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System.out.println(toString + ": running"); |
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|
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// block on the ORB...in time, management functionality can be placed here. |
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refman.getORB().run(); |
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} |
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|
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/** |
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* A simple method to print the usage of this class. |
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* It never returns, but instead exits to the system |
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* with a value 1, to indicate the system did not start |
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* properly. |
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*/ |
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public static void usage() { |
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System.out.println("USAGE: java uk.ac.ukc.iscream.componentmanager.ComponentManager <option>"); |
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System.out.println(" or: java -jar iscream.jar <option>"); |
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System.out.println("WHERE <option>:"); |
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System.out.println(" -l <filename> - the location of initial system properties"); |
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System.out.println(" the default is ./etc/default.properties"); |
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System.out.println(" -f <name> - the name of the filter (if there is one configured"); |
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System.out.println(" -h - this help screen"); |
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System.exit(1); |
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} |
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|
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//---CONSTRUCTORS--- |
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|
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//---PUBLIC METHODS--- |
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|
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//---PRIVATE METHODS--- |
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|
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//---ACCESSOR/MUTATOR METHODS--- |
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|
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//---ATTRIBUTES--- |
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|
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//---STATIC ATTRIBUTES--- |
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|
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} |
