Added timelimits to threads.

[jsvc.git] / src / dolda / jsvc / ThreadContext.java

diff --git a/src/dolda/jsvc/ThreadContext.java b/src/dolda/jsvc/ThreadContext.java
index 486bc91..27d90bf 100644 (file)
--- a/src/dolda/jsvc/ThreadContext.java
+++ b/src/dolda/jsvc/ThreadContext.java
@@ -1,7 +1,9 @@
 package dolda.jsvc;
 
+import dolda.jsvc.util.Misc;
 import java.util.logging.*;
 import java.lang.reflect.*;
+import java.util.*;
 
 public class ThreadContext extends ThreadGroup {
     private Logger logger = Logger.getLogger("dolda.jsvc.context");
@@ -9,6 +11,8 @@ public class ThreadContext extends ThreadGroup {
     private long reqs = 0;
     private final ServerContext ctx;
     public final Responder root;
+    private int timelimit = 0;
+    private boolean forcelimit = false;
     
     public ThreadContext(ThreadGroup parent, String name, ServerContext ctx, Class<?> bootclass) {
        super((parent == null)?(Thread.currentThread().getThreadGroup()):parent, name);
@@ -18,7 +22,88 @@ public class ThreadContext extends ThreadGroup {
                    logger.log(Level.SEVERE, "Worker thread terminated with an uncaught exception", e);
                }
            };
+       
+       int tl;
+       tl = Integer.parseInt(ctx.sysconfig("jsvc.timelimit", "0"));
+       if((tl > 0) && ((timelimit == 0) || (tl < timelimit)))
+           timelimit = tl;
+       tl = Integer.parseInt(ctx.libconfig("jsvc.timelimit", "0"));
+       if((tl > 0) && ((timelimit == 0) || (tl < timelimit)))
+           timelimit = tl;
+       forcelimit |= Misc.boolval(ctx.sysconfig("jsvc.forcelimit", "0"));
+       forcelimit |= Misc.boolval(ctx.libconfig("jsvc.forcelimit", "0"));
+       
        root = bootstrap(bootclass);
+       
+       if(timelimit > 0)
+           (new WatchDog()).start();
+    }
+    
+    private class WatchDog extends Thread {
+       private Map<RequestThread, State> state = new WeakHashMap<RequestThread, State>();
+       
+       private class State {
+           String st = "running";
+           long lastkill;
+       }
+       
+       private WatchDog() {
+           super(ThreadContext.this, "Worker watchdog");
+           setDaemon(true);
+       }
+       
+       @SuppressWarnings("deprecation")
+       private long ckthread(long now, RequestThread rt) {
+           State st = state.get(rt);
+           if(st == null) {
+               st = new State();
+               state.put(rt, st);
+           }
+           if(st.st == "running") {
+               if(now - rt.stime() > timelimit) {
+                   rt.interrupt();
+                   st.st = "interrupted";
+                   st.lastkill = now;
+                   return(5000);
+               } else {
+                   return(timelimit - (now - rt.stime()));
+               }
+           } else if((st.st == "interrupted") || (st.st == "killed")) {
+               if(st.st == "killed")
+                   logger.log(Level.WARNING, "Thread " + rt + " refused to die; killing again");
+               if(now - st.lastkill > 5000) {
+                   rt.stop();
+                   st.st = "killed";
+                   st.lastkill = now;
+               } else {
+                   return(5000 - (now - st.lastkill));
+               }
+           }
+           return(timelimit);
+       }
+
+       public void run() {
+           try {
+               while(true) {
+                   long next = timelimit;
+                   long now = System.currentTimeMillis();
+                   Thread[] w = new Thread[workers.activeCount() + 5];
+                   int num = workers.enumerate(w);
+                   for(int i = 0; i < num; i++) {
+                       if(w[i] instanceof RequestThread){
+                           RequestThread rt = (RequestThread)w[i];
+                           if(rt.stime() > 0) {
+                               long n = ckthread(now, rt);
+                               if(n < next)
+                                   next = n;
+                           }
+                       }
+                   }
+                   Thread.sleep(next);
+               }
+           } catch(InterruptedException e) {
+           }
+       }
     }
     
     public void uncaughtException(Thread t, Throwable e) {