| 1 | package dolda.jsvc; |
| 2 | |
| 3 | import java.util.logging.*; |
| 4 | import java.lang.reflect.*; |
| 5 | |
| 6 | public class ThreadContext extends ThreadGroup { |
| 7 | private Logger logger = Logger.getLogger("dolda.jsvc.context"); |
| 8 | private ThreadGroup workers; |
| 9 | private long reqs = 0; |
| 10 | public final Responder root; |
| 11 | |
| 12 | public ThreadContext(ThreadGroup parent, String name, Class<?> bootclass) { |
| 13 | super((parent == null)?(Thread.currentThread().getThreadGroup()):parent, name); |
| 14 | workers = new ThreadGroup(this, "Worker threads") { |
| 15 | public void uncaughtException(Thread t, Throwable e) { |
| 16 | logger.log(Level.SEVERE, "Worker thread terminated with an uncaught exception", e); |
| 17 | } |
| 18 | }; |
| 19 | root = bootstrap(bootclass); |
| 20 | } |
| 21 | |
| 22 | public void uncaughtException(Thread t, Throwable e) { |
| 23 | logger.log(Level.SEVERE, "Service thread " + t.toString() + " terminated with an uncaught exception", e); |
| 24 | } |
| 25 | |
| 26 | public void shutdown() { |
| 27 | if(root instanceof ContextResponder) |
| 28 | ((ContextResponder)root).destroy(); |
| 29 | try { |
| 30 | long last = 0; |
| 31 | while(true) { |
| 32 | long now = System.currentTimeMillis(); |
| 33 | if(now - last > 10000) { |
| 34 | interrupt(); |
| 35 | last = now; |
| 36 | } |
| 37 | Thread[] th = new Thread[1]; |
| 38 | if(enumerate(th) < 1) |
| 39 | break; |
| 40 | th[0].join(10000); |
| 41 | } |
| 42 | } catch(InterruptedException e) { |
| 43 | logger.log(Level.WARNING, "Interrupted while trying to shut down all service threads. Some may remain.", e); |
| 44 | } |
| 45 | destroy(); |
| 46 | } |
| 47 | |
| 48 | public RequestThread respond(Request req) { |
| 49 | return(new RequestThread(root, req, workers, "Worker thread " + reqs++)); |
| 50 | } |
| 51 | |
| 52 | private Responder bootstrap(final Class<?> bootclass) { |
| 53 | final Throwable[] err = new Throwable[1]; |
| 54 | final Responder[] res = new Responder[1]; |
| 55 | Thread boot = new Thread(this, "JSvc boot thread") { |
| 56 | public void run() { |
| 57 | try { |
| 58 | Method cm = bootclass.getMethod("responder"); |
| 59 | Object resp = cm.invoke(null); |
| 60 | if(!(resp instanceof Responder)) |
| 61 | throw(new ClassCastException("JSvc bootstrapper did not return a responder")); |
| 62 | res[0] = (Responder)resp; |
| 63 | } catch(NoSuchMethodException e) { |
| 64 | logger.log(Level.SEVERE, "Invalid JSvc bootstrapper specified", e); |
| 65 | err[0] = e; |
| 66 | } catch(IllegalAccessException e) { |
| 67 | logger.log(Level.SEVERE, "Invalid JSvc bootstrapper specified", e); |
| 68 | err[0] = e; |
| 69 | } catch(InvocationTargetException e) { |
| 70 | logger.log(Level.SEVERE, "JSvc bootstrapper failed", e); |
| 71 | err[0] = e; |
| 72 | } |
| 73 | } |
| 74 | }; |
| 75 | boot.start(); |
| 76 | try { |
| 77 | boot.join(); |
| 78 | } catch(InterruptedException e) { |
| 79 | logger.log(Level.WARNING, "Interrupted during bootstrapping", e); |
| 80 | boot.interrupt(); |
| 81 | Thread.currentThread().interrupt(); |
| 82 | } |
| 83 | if(err[0] != null) |
| 84 | throw(new RuntimeException(err[0])); |
| 85 | if(res[0] == null) { |
| 86 | logger.log(Level.SEVERE, "No responder returned in spite of no error having happened."); |
| 87 | throw(new NullPointerException("No responder returned in spite of no error having happened.")); |
| 88 | } |
| 89 | return(res[0]); |
| 90 | } |
| 91 | } |