| 38 |
|
*/ |
| 39 |
|
public static final String DEFAULTPROPERTIES = "./etc/default.properties"; |
| 40 |
|
|
| 41 |
+ |
/** |
| 42 |
+ |
* The default time to wait before retrying |
| 43 |
+ |
* component. |
| 44 |
+ |
*/ |
| 45 |
+ |
public static final int DEFAULT_COMPONENT_START_TIMEOUT = 5; |
| 46 |
+ |
|
| 47 |
|
//---STATIC METHODS--- |
| 48 |
|
|
| 49 |
|
/** |
| 53 |
|
* @param args the command line arguments |
| 54 |
|
*/ |
| 55 |
|
public static void main(String[] args) { |
| 56 |
< |
System.out.println("--- I-Scream System Component Manager ---"); |
| 56 |
> |
System.out.println("--- i-scream Server Component Manager ---"); |
| 57 |
|
System.out.println("--- Starting System ---"); |
| 58 |
|
|
| 59 |
|
// get the command line args |
| 54 |
– |
// this is a bit messy and should be looked at |
| 60 |
|
String defaultProperties = DEFAULTPROPERTIES; |
| 61 |
|
String filterName = null; |
| 62 |
< |
if (args.length > 0) { |
| 63 |
< |
if (args[0].equals("-l")) { |
| 59 |
< |
defaultProperties = args[1]; |
| 60 |
< |
} else if (args[0].equals("-f")) { |
| 61 |
< |
filterName = args[1]; |
| 62 |
< |
} else if (args[2].equals("-l")) { |
| 63 |
< |
filterName = args[3]; |
| 64 |
< |
} else if (args[2].equals("-f")) { |
| 65 |
< |
filterName = args[3]; |
| 66 |
< |
} else { |
| 62 |
> |
for(int i=0; i < args.length; i++) { |
| 63 |
> |
if(args[i].equals("-h")) { |
| 64 |
|
usage(); |
| 65 |
< |
} |
| 65 |
> |
} |
| 66 |
> |
else if(args[i].equals("-f")) { |
| 67 |
> |
i++; filterName = args[i]; |
| 68 |
> |
} |
| 69 |
> |
else if(args[i].equals("-l")) { |
| 70 |
> |
i++; defaultProperties = args[i]; |
| 71 |
> |
} |
| 72 |
> |
else { |
| 73 |
> |
usage(); |
| 74 |
> |
} |
| 75 |
|
} |
| 76 |
|
|
| 77 |
|
// load the default properties file into the system properties |
| 98 |
|
// get the list of components |
| 99 |
|
String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList"); |
| 100 |
|
StringTokenizer st = new StringTokenizer(componentList, ";"); |
| 101 |
+ |
_componentsToStart = new ArrayList(); |
| 102 |
|
|
| 103 |
|
// this could be done using reflection |
| 104 |
|
// but..well..we don't ;-p |
| 105 |
|
while (st.hasMoreTokens()){ |
| 106 |
|
String componentName = st.nextToken(); |
| 107 |
|
Component component = null; |
| 101 |
– |
System.out.println(toString + ": starting component - " + componentName); |
| 108 |
|
|
| 109 |
+ |
|
| 110 |
|
// ### This is where the list of supported components is checked! ### |
| 111 |
|
if (componentName.equalsIgnoreCase("core")) { |
| 112 |
|
component = new uk.ac.ukc.iscream.core.Core(); |
| 121 |
|
// note the passing of the Filter's name in its constructor |
| 122 |
|
} else if (componentName.equalsIgnoreCase("filter")) { |
| 123 |
|
component = new uk.ac.ukc.iscream.filter.FilterMain(filterName); |
| 124 |
+ |
} else if (componentName.equalsIgnoreCase("client")) { |
| 125 |
+ |
component = new uk.ac.ukc.iscream.client.ClientMain(); |
| 126 |
|
} |
| 127 |
|
// ### Add new component constructors in the above section! ### |
| 128 |
|
|
| 129 |
+ |
// build the list of components to start |
| 130 |
|
if (component != null) { |
| 131 |
< |
try { |
| 131 |
> |
_componentsToStart.add(component); |
| 132 |
> |
} else { |
| 133 |
> |
System.err.println(toString + ": WARNING unsupported component not started"); |
| 134 |
> |
} |
| 135 |
> |
} |
| 136 |
> |
|
| 137 |
> |
|
| 138 |
> |
|
| 139 |
> |
// get the value for timeout |
| 140 |
> |
|
| 141 |
> |
String confTimeout = null; |
| 142 |
> |
try { |
| 143 |
> |
confTimeout = System.getProperty("uk.ac.ukc.iscream.ComponentTimeout"); |
| 144 |
> |
confTimeout.trim(); |
| 145 |
> |
_startTimeout = Integer.parseInt(confTimeout); |
| 146 |
> |
} catch (NumberFormatException e) { |
| 147 |
> |
_startTimeout = DEFAULT_COMPONENT_START_TIMEOUT; |
| 148 |
> |
System.err.println(toString + ": unable to read uk.ac.ukc.iscream.ComponentTimeout value (" + confTimeout + "), using default!"); |
| 149 |
> |
} |
| 150 |
> |
System.out.println(toString + ": using component start timeout of " + _startTimeout + " seconds"); |
| 151 |
> |
|
| 152 |
> |
// startup the system components |
| 153 |
> |
startUp(); |
| 154 |
> |
|
| 155 |
> |
// block on the ORB...in time, management functionality can be placed here. |
| 156 |
> |
// if we detect a CORBA communication error, we'll restart all the components. |
| 157 |
> |
while(true) { |
| 158 |
> |
try { |
| 159 |
> |
refman.getORB().run(); |
| 160 |
> |
} catch (org.omg.CORBA.COMM_FAILURE e) { |
| 161 |
> |
System.out.println(toString + ": WARNING CORBA communications failure - " + e.getMessage()); |
| 162 |
> |
System.out.println(toString + ": WARNING CORBA connections have been lost - attempting to restart!"); |
| 163 |
> |
} |
| 164 |
> |
startUp(); |
| 165 |
> |
} |
| 166 |
> |
} |
| 167 |
> |
|
| 168 |
> |
/** |
| 169 |
> |
* Starts the components as obtained from the configuration. |
| 170 |
> |
* This method calls the start() methods on all the components. |
| 171 |
> |
* If a component fails to start due to a CORBA communication |
| 172 |
> |
* problem, then it catches this and tries to start it again |
| 173 |
> |
* according to uk.ac.ukc.iscream.ComponentTimeout time. |
| 174 |
> |
* |
| 175 |
> |
* If the server dies and CORBA connections are lost, this method |
| 176 |
> |
* is called again. |
| 177 |
> |
*/ |
| 178 |
> |
private static void startUp() { |
| 179 |
> |
// now we try and start the beast up |
| 180 |
> |
boolean tryAgain = true; |
| 181 |
> |
Component component = null; |
| 182 |
> |
|
| 183 |
> |
// keep trying until we've started all the components. |
| 184 |
> |
// maybe add support for a limited number of retries |
| 185 |
> |
while(tryAgain) { |
| 186 |
> |
Iterator i = _componentsToStart.iterator(); |
| 187 |
> |
ArrayList failedComponents = new ArrayList(); |
| 188 |
> |
// go through all the components |
| 189 |
> |
while(i.hasNext()) { |
| 190 |
> |
try { |
| 191 |
> |
component = (Component) i.next(); |
| 192 |
> |
System.out.println(toString + ": starting component - " + component.toString()); |
| 193 |
> |
|
| 194 |
> |
// start the component |
| 195 |
|
component.start(); |
| 196 |
+ |
|
| 197 |
+ |
// if we get this then there was a problem |
| 198 |
+ |
// that we can't recover from |
| 199 |
|
} catch (ComponentStartException e) { |
| 200 |
< |
System.err.println(toString + ": ERROR starting component - " + componentName); |
| 200 |
> |
System.err.println(toString + ": ERROR starting component - " + component.toString()); |
| 201 |
|
System.err.println(toString + ": component reports - " + e.getMessage()); |
| 202 |
|
System.exit(1); |
| 203 |
+ |
|
| 204 |
+ |
// if we get this exception then we've tried |
| 205 |
+ |
// to talk to something which may not be up yet |
| 206 |
+ |
// so we want to try again in a minute |
| 207 |
+ |
} catch(ComponentCORBAException e2) { |
| 208 |
+ |
System.err.println(toString + ": WARNING Component reported CORBA communications failure"); |
| 209 |
+ |
System.err.println(toString + ": This could be because it can't communicate with components it needs."); |
| 210 |
+ |
System.err.println(toString + ": component reports - " + e2.getMessage()); |
| 211 |
+ |
|
| 212 |
+ |
// make a list of the failed components |
| 213 |
+ |
failedComponents.add(component); |
| 214 |
|
} |
| 215 |
+ |
} |
| 216 |
+ |
|
| 217 |
+ |
// if we had some failed components that we can retry |
| 218 |
+ |
if (failedComponents.size() > 0) { |
| 219 |
+ |
System.err.println(toString + ": WARNING One or more components failed to start correctly."); |
| 220 |
+ |
System.err.println(toString + ": Will try again in " + _startTimeout + " seconds"); |
| 221 |
+ |
|
| 222 |
+ |
// our list is now the failed list |
| 223 |
+ |
_componentsToStart = failedComponents; |
| 224 |
+ |
|
| 225 |
+ |
// sleep for a given timeout |
| 226 |
+ |
try { |
| 227 |
+ |
Thread.sleep(_startTimeout * 1000); |
| 228 |
+ |
} catch (InterruptedException e) { |
| 229 |
+ |
// we're not bothered |
| 230 |
+ |
} |
| 231 |
+ |
// otherwise we started everything |
| 232 |
|
} else { |
| 233 |
< |
System.err.println(toString + ": WARNING unsupported component not started"); |
| 233 |
> |
// so we set to exit the loop |
| 234 |
> |
tryAgain = false; |
| 235 |
|
} |
| 236 |
|
} |
| 237 |
+ |
|
| 238 |
|
System.out.println(toString + ": running"); |
| 239 |
< |
|
| 134 |
< |
// block on the ORB...in time, management functionality can be placed here. |
| 135 |
< |
refman.getORB().run(); |
| 136 |
< |
} |
| 239 |
> |
} |
| 240 |
|
|
| 241 |
|
/** |
| 242 |
|
* A simple method to print the usage of this class. |
| 266 |
|
//---ATTRIBUTES--- |
| 267 |
|
|
| 268 |
|
//---STATIC ATTRIBUTES--- |
| 269 |
+ |
|
| 270 |
+ |
private static ArrayList _componentsToStart; |
| 271 |
+ |
private static int _startTimeout = 0; |
| 272 |
|
|
| 273 |
|
} |
