| 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 |
|
/** |
| 98 |
|
// get the list of components |
| 99 |
|
String componentList = System.getProperty("uk.ac.ukc.iscream.ComponentList"); |
| 100 |
|
StringTokenizer st = new StringTokenizer(componentList, ";"); |
| 95 |
– |
|
| 96 |
– |
|
| 101 |
|
ArrayList componentsToStart = new ArrayList(); |
| 102 |
|
|
| 103 |
|
// this could be done using reflection |
| 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 |
|
componentsToStart.add(component); |
| 132 |
|
} else { |
| 134 |
|
} |
| 135 |
|
} |
| 136 |
|
|
| 137 |
+ |
// now we try and start the beast up |
| 138 |
|
boolean tryAgain = true; |
| 139 |
|
Component component = null; |
| 140 |
+ |
|
| 141 |
+ |
// get the value for timeout |
| 142 |
+ |
int startTimeout = 0; |
| 143 |
+ |
String confTimeout = null; |
| 144 |
+ |
try { |
| 145 |
+ |
confTimeout = System.getProperty("uk.ac.ukc.iscream.ComponentTimeout"); |
| 146 |
+ |
confTimeout.trim(); |
| 147 |
+ |
startTimeout = Integer.parseInt(confTimeout); |
| 148 |
+ |
} catch (NumberFormatException e) { |
| 149 |
+ |
startTimeout = DEFAULT_COMPONENT_START_TIMEOUT; |
| 150 |
+ |
System.err.println(toString + ": unable to read uk.ac.ukc.iscream.ComponentTimeout value (" + confTimeout + "), using default!"); |
| 151 |
+ |
} |
| 152 |
+ |
System.out.println(toString + ": using component start timeout of " + startTimeout + " seconds"); |
| 153 |
+ |
|
| 154 |
+ |
// keep trying until we've started all the components. |
| 155 |
+ |
// maybe add support for a limited number of retries |
| 156 |
|
while(tryAgain) { |
| 157 |
|
Iterator i = componentsToStart.iterator(); |
| 158 |
+ |
ArrayList failedComponents = new ArrayList(); |
| 159 |
+ |
// go through all the components |
| 160 |
|
while(i.hasNext()) { |
| 161 |
|
try { |
| 162 |
|
component = (Component) i.next(); |
| 163 |
|
System.out.println(toString + ": starting component - " + component.toString()); |
| 164 |
+ |
|
| 165 |
+ |
// start the component |
| 166 |
|
component.start(); |
| 167 |
< |
componentsToStart.remove(componentsToStart.indexOf(component)); |
| 167 |
> |
|
| 168 |
> |
// if we get this then there was a problem |
| 169 |
> |
// that we can't recover from |
| 170 |
|
} catch (ComponentStartException e) { |
| 171 |
|
System.err.println(toString + ": ERROR starting component - " + component.toString()); |
| 172 |
|
System.err.println(toString + ": component reports - " + e.getMessage()); |
| 173 |
|
System.exit(1); |
| 174 |
+ |
|
| 175 |
+ |
// if we get this exception then we've tried |
| 176 |
+ |
// to talk to something which may not be up yet |
| 177 |
+ |
// so we want to try again in a minute |
| 178 |
|
} catch(ComponentCORBAException e2) { |
| 179 |
|
System.err.println(toString + ": WARNING Component reported CORBA communications failure"); |
| 180 |
|
System.err.println(toString + ": This could be because it can't communicate with components it needs."); |
| 181 |
|
System.err.println(toString + ": component reports - " + e2.getMessage()); |
| 182 |
+ |
|
| 183 |
+ |
// make a list of the failed components |
| 184 |
+ |
failedComponents.add(component); |
| 185 |
|
} |
| 186 |
|
} |
| 187 |
< |
if (componentsToStart.size() > 0) { |
| 187 |
> |
|
| 188 |
> |
// if we had some failed components that we can retry |
| 189 |
> |
if (failedComponents.size() > 0) { |
| 190 |
|
System.err.println(toString + ": WARNING One or more components failed to start correctly."); |
| 191 |
< |
System.err.println(toString + ": Will try again in 5 seconds"); |
| 191 |
> |
System.err.println(toString + ": Will try again in " + startTimeout + " seconds"); |
| 192 |
> |
|
| 193 |
> |
// our list is now the failed list |
| 194 |
> |
componentsToStart = failedComponents; |
| 195 |
> |
|
| 196 |
> |
// sleep for a given timeout |
| 197 |
|
try { |
| 198 |
< |
Thread.sleep(5000); |
| 198 |
> |
Thread.sleep(startTimeout * 1000); |
| 199 |
|
} catch (InterruptedException e) { |
| 200 |
|
// we're not bothered |
| 201 |
|
} |
| 202 |
+ |
// otherwise we started everything |
| 203 |
|
} else { |
| 204 |
+ |
// so we set to exit the loop |
| 205 |
|
tryAgain = false; |
| 206 |
|
} |
| 207 |
|
} |
