| 1 |
//---PACKAGE DECLARATION--- |
| 2 |
|
| 3 |
//---IMPORTS--- |
| 4 |
import uk.ac.ukc.iscream.core.*; |
| 5 |
import org.omg.CORBA.*; |
| 6 |
import org.omg.CosNaming.*; |
| 7 |
import org.omg.PortableServer.*; |
| 8 |
import java.util.*; |
| 9 |
import java.io.*; |
| 10 |
|
| 11 |
/** |
| 12 |
* The main class for the CORE of the I-Scream system. |
| 13 |
* The main method of this class initialises the ORB |
| 14 |
* and then starts and registers CORE I-Scream services |
| 15 |
* with the name service. At which point it essentially |
| 16 |
* finishs its role and the started services continue to |
| 17 |
* serve requests from the I-Scream system. |
| 18 |
* |
| 19 |
* @author $Author: ajm4 $ |
| 20 |
* @version $Id: Core.java,v 1.14 2000/11/20 21:10:09 ajm4 Exp $ |
| 21 |
*/ |
| 22 |
class Core { |
| 23 |
|
| 24 |
//---FINAL ATTRIBUTES--- |
| 25 |
|
| 26 |
/** |
| 27 |
* The current CVS revision of this class |
| 28 |
*/ |
| 29 |
public static final String REVISION = "$Revision: 1.14 $"; |
| 30 |
|
| 31 |
/** |
| 32 |
* The toString() of this class |
| 33 |
* As it won't be instatiated, this is needed. |
| 34 |
*/ |
| 35 |
public static final String toString = "CORE(" + REVISION.substring(11, REVISION.length() - 2) + ")"; |
| 36 |
|
| 37 |
/** |
| 38 |
* The default location of the properties file for the system |
| 39 |
*/ |
| 40 |
public static final String DEFAULTPROPERTIES = "default.properties"; |
| 41 |
|
| 42 |
//---STATIC METHODS--- |
| 43 |
|
| 44 |
/** |
| 45 |
* The main method which starts the CORE |
| 46 |
* Currently the args are passed direct to the ORB, |
| 47 |
* so any ORB paramaters could go there. |
| 48 |
* |
| 49 |
* @param args the command line arguments |
| 50 |
*/ |
| 51 |
public static void main(String[] args) { |
| 52 |
System.out.println("--- I-Scream ---"); |
| 53 |
|
| 54 |
// get the command line args |
| 55 |
String defaultProperties = DEFAULTPROPERTIES; |
| 56 |
if (args.length > 0) { |
| 57 |
if (args[0].equals("-l")) { |
| 58 |
defaultProperties = args[1]; |
| 59 |
} else if (args[0].equals("-h")) { |
| 60 |
usage(); |
| 61 |
} else { |
| 62 |
usage(); |
| 63 |
} |
| 64 |
} |
| 65 |
|
| 66 |
// load the default properties file into the system properties |
| 67 |
System.out.println(toString + ": initialising - using " + defaultProperties); |
| 68 |
try { |
| 69 |
Properties initProperties = new Properties(System.getProperties()); |
| 70 |
initProperties.load(new FileInputStream(new File(defaultProperties))); |
| 71 |
System.setProperties(initProperties); |
| 72 |
|
| 73 |
|
| 74 |
} catch (Exception e) { |
| 75 |
System.err.println(toString + ": ERROR " + e.getMessage()); |
| 76 |
usage(); |
| 77 |
} |
| 78 |
|
| 79 |
// continue to bring the system up |
| 80 |
System.out.println(toString + ": coming up"); |
| 81 |
try { |
| 82 |
// start the ORB |
| 83 |
ORB orb = ORB.init(args, null); |
| 84 |
|
| 85 |
// get the Root POA |
| 86 |
org.omg.CORBA.Object objRef = orb.resolve_initial_references("RootPOA"); |
| 87 |
POA poa = POAHelper.narrow(objRef); |
| 88 |
|
| 89 |
// get a hook to the name service |
| 90 |
objRef = orb.resolve_initial_references("NameService"); |
| 91 |
NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef); |
| 92 |
|
| 93 |
// check we got it |
| 94 |
if (ncRef == null) { |
| 95 |
throw new Exception("Unable to locate CORBA Naming Service for configured ORB!"); |
| 96 |
} |
| 97 |
|
| 98 |
// start and bind each server in turn |
| 99 |
|
| 100 |
// work out which logger to use |
| 101 |
String whichLogger = System.getProperty("uk.ac.ukc.iscream.LoggerClass", defaultLogger); |
| 102 |
|
| 103 |
// construct the relevant LoggerImpl |
| 104 |
LoggerImpl loggerImplRef = (LoggerImpl) ClassLoader.getSystemClassLoader().loadClass(whichLogger).newInstance(); |
| 105 |
|
| 106 |
// setup and bind the LoggerServant |
| 107 |
LoggerServant loggerRef = new LoggerServant(loggerImplRef); |
| 108 |
objRef = poa.servant_to_reference(loggerRef); |
| 109 |
ncRef.bind(ncRef.to_name("iscream.Logger"), objRef); |
| 110 |
|
| 111 |
// get a reference to the servant as a Logger |
| 112 |
Logger logRef = LoggerHelper.narrow(objRef); |
| 113 |
|
| 114 |
// create the Configurator |
| 115 |
ConfigurationManagerServant configManRef = new ConfigurationManagerServant(poa, logRef); |
| 116 |
|
| 117 |
// and advertise it to the naming context |
| 118 |
objRef = poa.servant_to_reference(configManRef); |
| 119 |
ncRef.bind(ncRef.to_name("iscream.ConfigurationManager"), objRef); |
| 120 |
|
| 121 |
// start the POA off |
| 122 |
poa.the_POAManager().activate(); |
| 123 |
|
| 124 |
logRef.write(toString, Logger.SYSINIT, "started"); |
| 125 |
|
| 126 |
// now we are running, we just need to serve |
| 127 |
// so we ask the orb to block for us until it has finished |
| 128 |
orb.run(); |
| 129 |
|
| 130 |
// if there was a problem then we'll get to here |
| 131 |
} catch (Exception e) { |
| 132 |
|
| 133 |
// there is already another CORE of the same name registered |
| 134 |
if ( e instanceof org.omg.CosNaming.NamingContextPackage.AlreadyBound) { |
| 135 |
System.err.println("CORE ERROR: Another I-Scream CORE is already registered under the same name."); |
| 136 |
|
| 137 |
// otherwise we don't know what happened |
| 138 |
// so print the error and do a stack trace if debug is enabled |
| 139 |
} else { |
| 140 |
System.err.println("CORE ERROR: " + e.getMessage()); |
| 141 |
if (Integer.parseInt(System.getProperty("uk.ac.ukc.iscream.Verbosity")) == Logger.DEBUG) { |
| 142 |
System.err.println("*** DEBUG ENABLED - printing stack trace ***"); |
| 143 |
e.printStackTrace(System.out); |
| 144 |
} |
| 145 |
} |
| 146 |
} |
| 147 |
} |
| 148 |
|
| 149 |
/** |
| 150 |
* A simple method to print the usage of this class. |
| 151 |
* It never returns, but instead exits to the system |
| 152 |
* with a value 1, to indicate the system did not start |
| 153 |
* properly. |
| 154 |
*/ |
| 155 |
public static void usage() { |
| 156 |
System.out.println("USAGE: java Core <option>"); |
| 157 |
System.out.println("WHERE <option>:"); |
| 158 |
System.out.println(" -l <filename> - the location of initial system properties"); |
| 159 |
System.out.println(" -h - this help screen"); |
| 160 |
System.exit(1); |
| 161 |
} |
| 162 |
|
| 163 |
//---CONSTRUCTORS--- |
| 164 |
|
| 165 |
//---PUBLIC METHODS--- |
| 166 |
|
| 167 |
//---PRIVATE METHODS--- |
| 168 |
|
| 169 |
//---ACCESSOR/MUTATOR METHODS--- |
| 170 |
|
| 171 |
//---ATTRIBUTES--- |
| 172 |
|
| 173 |
//---STATIC ATTRIBUTES--- |
| 174 |
|
| 175 |
/** |
| 176 |
* Default logger, to be used when one is not provided |
| 177 |
* in the configuration. |
| 178 |
*/ |
| 179 |
private static final String defaultLogger = "ScreenLogger"; |
| 180 |
|
| 181 |
/** |
| 182 |
* Default configPath, to be used when one is not provided |
| 183 |
* in the configuration. |
| 184 |
*/ |
| 185 |
private static final String defaultConfigPath = "."; |
| 186 |
|
| 187 |
} |
