Metrics! Added support for a "state of the server" report, in which

managers can participate, reporting lies, damned lies and useful
statistics. Initial participants include the client manager, the
connection manager and the distributed object manager.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@1894 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/java/com/threerings/presents/server/PresentsDObjectMgr.java

@@ -1,14 +1,16 @@
 //
-// $Id: PresentsDObjectMgr.java,v 1.25 2002/07/17 01:54:33 mdb Exp $
+// $Id: PresentsDObjectMgr.java,v 1.26 2002/11/05 02:17:56 mdb Exp $
 
 package com.threerings.presents.server;
 
 import java.lang.reflect.*;
 import java.util.HashMap;
+import java.util.Iterator;
 import java.util.List;
 
 import com.samskivert.util.HashIntMap;
 import com.samskivert.util.Queue;
+import com.samskivert.util.SortableArrayList;
 import com.samskivert.util.StringUtil;
 
 import com.threerings.presents.Log;
@@ -27,7 +29,8 @@ import com.threerings.presents.dobj.*;
  * application main thread which won't return until the manager has been
  * requested to shut down.
  */
-public class PresentsDObjectMgr implements RootDObjectManager
+public class PresentsDObjectMgr
+    implements RootDObjectManager, PresentsServer.Reporter
 {
     /**
      * Creates the dobjmgr and prepares it for operation.
@@ -40,6 +43,9 @@ public class PresentsDObjectMgr implements RootDObjectManager
         dummy.setOid(0);
         dummy.setManager(this);
         _objects.put(0, new DObject());
+
+        // register ourselves as a state of server reporter
+        PresentsServer.registerReporter(this);
     }
 
     /**
@@ -174,8 +180,8 @@ public class PresentsDObjectMgr implements RootDObjectManager
         // look up the target object
         DObject target = (DObject)_objects.get(event.getTargetOid());
         if (target == null) {
-            Log.warning("Event target no longer exists " +
-                        "[event=" + event + "].");
+            Log.debug("Event target no longer exists " +
+                      "[event=" + event + "].");
             return;
         }
 
@@ -215,6 +221,9 @@ public class PresentsDObjectMgr implements RootDObjectManager
                         ", target=" + target + "].");
             Log.logStackTrace(e);
         }
+
+        // track the number of events dispatched
+        ++_eventCount;
     }
 
     /**
@@ -462,6 +471,45 @@ public class PresentsDObjectMgr implements RootDObjectManager
         return _nextOid;
     }
 
+    // documentation inherited from interface PresentsServer.Reporter
+    public void appendReport (StringBuffer report, long now, long sinceLast)
+    {
+        report.append("* presents.PresentsDObjectMgr:\n");
+
+        long processed = (_eventCount - _lastEventCount);
+        report.append("- Events since last report: ").append(processed);
+        report.append("\n");
+        _lastEventCount = _eventCount;
+
+        // summarize the objects in our dobject table
+        HashMap ccount = new HashMap();
+        SortableArrayList clist = new SortableArrayList();
+        Iterator iter = _objects.values().iterator();
+        while (iter.hasNext()) {
+            DObject obj = (DObject)iter.next();
+            String clazz = obj.getClass().getName();
+            int[] count = (int[])ccount.get(clazz);
+            if (count == null) {
+                count = new int[] { 0 };
+                ccount.put(clazz, count);
+                clist.add(clazz);
+            }
+            count[0]++;
+        }
+
+        // sort our list of dobject types
+        clist.sort();
+
+        report.append("- DObject count: ").append(_objects.size());
+        report.append("\n");
+        for (int ii = 0; ii < clist.size(); ii++) {
+            String clazz = (String)clist.get(ii);
+            int count = ((int[])ccount.get(clazz))[0];
+            report.append("  ").append(clazz).append(": ").append(count);
+            report.append("\n");
+        }
+    }
+
     /**
      * Calls {@link Subscriber#objectAvailable} and catches and logs any
      * exception thrown by the subscriber during the call.
@@ -696,6 +744,15 @@ public class PresentsDObjectMgr implements RootDObjectManager
     /** Used to assign a unique oid to each distributed object. */
     protected int _nextOid = 0;
 
+    /** Used to track the number of events dispatched over time. */
+    protected long _eventCount = 0;
+
+    /** Used to track the number of events dispatched over of time. */
+    protected long _lastEventCount = 0;
+
+    /** The last time at which we generated a report. */
+    protected long _lastReportStamp;
+
     /** Used to track oid list references of distributed objects. */
     protected HashIntMap _refs = new HashIntMap();
 
@@ -703,6 +760,13 @@ public class PresentsDObjectMgr implements RootDObjectManager
      * objects. */
     protected AccessController _defaultController;
 
+    /** Check whether we should generate a report every 100 events. */
+    protected static final long REPORT_CHECK_PERIOD = 100;
+
+    /** Generate a report no more frequently than once per five
+     * minutes. */
+    protected static final long REPORT_PERIOD = 5 * 60 * 1000L;
+
     /** The default size of an oid list refs vector. */
     protected static final int DEFREFVEC_SIZE = 4;