| 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 | private final ServerContext ctx; |
| 11 | public final Responder root; |
| 12 | |
| 13 | public ThreadContext(ThreadGroup parent, String name, ServerContext ctx, Class<?> bootclass) { |
| 14 | super((parent == null)?(Thread.currentThread().getThreadGroup()):parent, name); |
| 15 | this.ctx = ctx; |
| 16 | workers = new ThreadGroup(this, "Worker threads") { |
| 17 | public void uncaughtException(Thread t, Throwable e) { |
| 18 | logger.log(Level.SEVERE, "Worker thread terminated with an uncaught exception", e); |
| 19 | } |
| 20 | }; |
| 21 | root = bootstrap(bootclass); |
| 22 | } |
| 23 | |
| 24 | public void uncaughtException(Thread t, Throwable e) { |
| 25 | logger.log(Level.SEVERE, "Service thread " + t.toString() + " terminated with an uncaught exception", e); |
| 26 | } |
| 27 | |
| 28 | public ServerContext server() { |
| 29 | return(ctx); |
| 30 | } |
| 31 | |
| 32 | public void shutdown() { |
| 33 | if(root instanceof ContextResponder) |
| 34 | ((ContextResponder)root).destroy(); |
| 35 | try { |
| 36 | long last = 0; |
| 37 | while(true) { |
| 38 | long now = System.currentTimeMillis(); |
| 39 | if(now - last > 10000) { |
| 40 | interrupt(); |
| 41 | last = now; |
| 42 | } |
| 43 | Thread[] th = new Thread[1]; |
| 44 | if(enumerate(th) < 1) |
| 45 | break; |
| 46 | th[0].join(10000); |
| 47 | } |
| 48 | } catch(InterruptedException e) { |
| 49 | logger.log(Level.WARNING, "Interrupted while trying to shut down all service threads. Some may remain.", e); |
| 50 | } |
| 51 | destroy(); |
| 52 | } |
| 53 | |
| 54 | public RequestThread respond(Request req) { |
| 55 | return(new RequestThread(root, req, workers, "Worker thread " + reqs++)); |
| 56 | } |
| 57 | |
| 58 | private Responder bootstrap(final Class<?> bootclass) { |
| 59 | final Throwable[] err = new Throwable[1]; |
| 60 | final Responder[] res = new Responder[1]; |
| 61 | Thread boot = new Thread(this, "JSvc boot thread") { |
| 62 | public void run() { |
| 63 | try { |
| 64 | Method cm = bootclass.getMethod("responder"); |
| 65 | Object resp = cm.invoke(null); |
| 66 | if(!(resp instanceof Responder)) |
| 67 | throw(new ClassCastException("JSvc bootstrapper did not return a responder")); |
| 68 | res[0] = (Responder)resp; |
| 69 | } catch(NoSuchMethodException e) { |
| 70 | logger.log(Level.SEVERE, "Invalid JSvc bootstrapper specified", e); |
| 71 | err[0] = e; |
| 72 | } catch(IllegalAccessException e) { |
| 73 | logger.log(Level.SEVERE, "Invalid JSvc bootstrapper specified", e); |
| 74 | err[0] = e; |
| 75 | } catch(InvocationTargetException e) { |
| 76 | logger.log(Level.SEVERE, "JSvc bootstrapper failed", e); |
| 77 | err[0] = e; |
| 78 | } |
| 79 | } |
| 80 | }; |
| 81 | boot.start(); |
| 82 | try { |
| 83 | boot.join(); |
| 84 | } catch(InterruptedException e) { |
| 85 | logger.log(Level.WARNING, "Interrupted during bootstrapping", e); |
| 86 | boot.interrupt(); |
| 87 | Thread.currentThread().interrupt(); |
| 88 | } |
| 89 | if(err[0] != null) { |
| 90 | destroy(); |
| 91 | throw(new RuntimeException(err[0])); |
| 92 | } |
| 93 | if(res[0] == null) { |
| 94 | destroy(); |
| 95 | logger.log(Level.SEVERE, "No responder returned in spite of no error having happened."); |
| 96 | throw(new NullPointerException("No responder returned in spite of no error having happened.")); |
| 97 | } |
| 98 | return(res[0]); |
| 99 | } |
| 100 | |
| 101 | public static ThreadContext current() { |
| 102 | for(ThreadGroup tg = Thread.currentThread().getThreadGroup(); tg != null; tg = tg.getParent()) { |
| 103 | if(tg instanceof ThreadContext) |
| 104 | return((ThreadContext)tg); |
| 105 | } |
| 106 | return(null); |
| 107 | } |
| 108 | } |