AfflictionNetworks/narya
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Revamped distributed object creation. There was no particular reason to create

Browse Source 
distributed objects by reflection since we don't allow clients to create
objects, furthermore we needn't do it asynchronously. The object creation
methods were moved into the server-side only interface and made "immediate", so
the caller creates a derived instance of DObject and registers it with the
system instead of creating it with a Subscriber callback.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@4342 542714f4-19e9-0310-aa3c-eee0fc999fb1
This commit is contained in:
Michael Bayne
2006-08-23 23:46:48 +00:00
parent 1f204669c4
commit bc9f53396c
19 changed files with 304 additions and 589 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/java/com/threerings/presents/server/PresentsDObjectMgr.java
+74 -140
View File
@@ -26,6 +26,7 @@ import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import sun.misc.Perf;
@@ -39,9 +40,10 @@ import com.samskivert.util.RunQueue;
import com.samskivert.util.StringUtil;
import com.samskivert.util.Throttle;
import com.threerings.presents.Log;
import com.threerings.presents.dobj.*;
import static com.threerings.presents.Log.log;
/**
* The presents distributed object manager implements the {@link
* DObjectManager} interface, providing an object manager that runs on the
@@ -109,22 +111,14 @@ public class PresentsDObjectMgr
}
}
// documentation inherited from interface
// from interface DObjectManager
public boolean isManager (DObject object)
{
// we are always authoritative in the present implementation
return true;
}
// inherit documentation from the interface
public <T extends DObject> void createObject (
Class<T> dclass, Subscriber<T> target)
{
// queue up a create object event
postEvent(new CreateObjectEvent<T>(dclass, target));
}
// inherit documentation from the interface
// from interface DObjectManager
public <T extends DObject> void subscribeToObject (
int oid, Subscriber<T> target)
{
@@ -138,7 +132,7 @@ public class PresentsDObjectMgr
}
}
// inherit documentation from the interface
// from interface DObjectManager
public <T extends DObject> void unsubscribeFromObject (
int oid, Subscriber<T> target)
{
@@ -147,21 +141,14 @@ public class PresentsDObjectMgr
oid, target, AccessObjectEvent.UNSUBSCRIBE));
}
// inherit documentation from the interface
public void destroyObject (int oid)
{
// queue up an object destroyed event
postEvent(new ObjectDestroyedEvent(oid));
}
// inherit documentation from the interface
// from interface DObjectManager
public void postEvent (DEvent event)
{
// just append it to the queue
_evqueue.append(event);
}
// inherit documentation from the interface
// from interface DObjectManager
public void removedLastSubscriber (DObject obj, boolean deathWish)
{
// destroy the object if it so desires
@@ -170,6 +157,31 @@ public class PresentsDObjectMgr
}
}
// from interface RootDObjectManager
public <T extends DObject> T registerObject (T object)
{
int oid = getNextOid();
// initialize this object
object.setOid(oid);
object.setManager(PresentsDObjectMgr.this);
object.setAccessController(_defaultController);
// insert it into the table
_objects.put(oid, object);
// log.info("Registered object [obj=" + object + "].");
return object;
}
// from interface RootDObjectManager
public void destroyObject (int oid)
{
// queue up an object destroyed event
postEvent(new ObjectDestroyedEvent(oid));
}
/**
* Posts a self-contained unit of code that should be run on the
* distributed object manager thread at the next available
@@ -186,13 +198,10 @@ public class PresentsDObjectMgr
}
/**
* Returns the object in the object table with the specified oid or
* null if no object has that oid. Be sure only to call this function
* from the dobjmgr thread and not to do anything funny with the
* object. If subscription is desired, use
* <code>subscribeToObject()</code>.
*
* @see #subscribeToObject
* Returns the object in the object table with the specified oid or null if
* no object has that oid. Be sure only to call this function from the
* dobjmgr thread and not to do anything funny with the object. If
* subscription is desired, use {@link #subscribeToObject}.
*/
public DObject getObject (int oid)
{
@@ -227,7 +236,7 @@ public class PresentsDObjectMgr
*/
public void run ()
{
Log.info("DOMGR running.");
log.info("DOMGR running.");
// make a note of the thread that's processing events
synchronized (this) {
@@ -239,7 +248,7 @@ public class PresentsDObjectMgr
processUnit(_evqueue.get());
}
Log.info("DOMGR exited.");
log.info("DOMGR exited.");
}
/**
@@ -270,8 +279,8 @@ public class PresentsDObjectMgr
}
} catch (Exception e) {
Log.warning("Execution unit failed [unit=" + unit + "].");
Log.logStackTrace(e);
log.log(Level.WARNING,
"Execution unit failed [unit=" + unit + "].", e);
} catch (Error e) {
handleFatalError(unit, e);
@@ -283,9 +292,9 @@ public class PresentsDObjectMgr
// report excessively long units
if (elapsed > 500000) {
Log.warning("Long dobj unit [u=" + StringUtil.safeToString(unit) +
" (" + StringUtil.shortClassName(unit) + ")" +
", time=" + (elapsed/1000) + "ms].");
log.warning("Long dobj unit [u=" + StringUtil.safeToString(unit) +
" (" + StringUtil.shortClassName(unit) + ")" +
", time=" + (elapsed/1000) + "ms].");
}
// periodically sample and record the time spent processing a unit
@@ -326,8 +335,8 @@ public class PresentsDObjectMgr
// look up the target object
DObject target = _objects.get(event.getTargetOid());
if (target == null) {
Log.debug("Compound event target no longer exists " +
"[event=" + event + "].");
log.fine("Compound event target no longer exists " +
"[event=" + event + "].");
return;
}
@@ -335,8 +344,8 @@ public class PresentsDObjectMgr
for (int ii = 0; ii < ecount; ii++) {
DEvent sevent = (DEvent)events.get(ii);
if (!target.checkPermissions(sevent)) {
Log.warning("Event failed permissions check " +
"[event=" + sevent + ", target=" + target + "].");
log.warning("Event failed permissions check " +
"[event=" + sevent + ", target=" + target + "].");
return;
}
}
@@ -359,15 +368,14 @@ public class PresentsDObjectMgr
// look up the target object
DObject target = _objects.get(event.getTargetOid());
if (target == null) {
Log.debug("Event target no longer exists " +
"[event=" + event + "].");
log.fine("Event target no longer exists [event=" + event + "].");
return;
}
// check the event's permissions
if (!target.checkPermissions(event)) {
Log.warning("Event failed permissions check " +
"[event=" + event + ", target=" + target + "].");
log.warning("Event failed permissions check " +
"[event=" + event + ", target=" + target + "].");
return;
}
@@ -410,9 +418,8 @@ public class PresentsDObjectMgr
}
} catch (Exception e) {
Log.warning("Failure processing event [event=" + event +
", target=" + target + "].");
Log.logStackTrace(e);
log.log(Level.WARNING, "Failure processing event [event=" + event +
", target=" + target + "].", e);
} catch (Error e) {
handleFatalError(event, e);
@@ -433,8 +440,8 @@ public class PresentsDObjectMgr
if (_fatalThrottle.throttleOp()) {
throw error;
}
Log.warning("Fatal error caused by '" + causer + "': " + error);
Log.logStackTrace(error);
log.log(Level.WARNING,
"Fatal error caused by '" + causer + "': " + error, error);
}
/**
@@ -457,7 +464,7 @@ public class PresentsDObjectMgr
public void dumpUnitProfiles ()
{
for (Map.Entry<String,UnitProfile> entry : _profiles.entrySet()) {
Log.info("P: " + entry.getKey() + " => " + entry.getValue());
log.info("P: " + entry.getKey() + " => " + entry.getValue());
}
}
@@ -472,7 +479,7 @@ public class PresentsDObjectMgr
{
int oid = target.getOid();
// Log.info("Removing destroyed object from table " +
// log.info("Removing destroyed object from table " +
// "[oid=" + oid + "].");
// remove the object from the table
@@ -498,10 +505,10 @@ public class PresentsDObjectMgr
// post an object removed event to clear the reference
postEvent(new ObjectRemovedEvent(
ref.reffingOid, ref.field, oid));
// Log.info("Forcing removal " + ref + ".");
// log.info("Forcing removal " + ref + ".");
} else {
Log.info("Dangling reference from inactive object " +
log.info("Dangling reference from inactive object " +
ref + ".");
}
}
@@ -534,7 +541,7 @@ public class PresentsDObjectMgr
}
} catch (Exception e) {
Log.warning("Unable to clean up after oid list field " +
log.warning("Unable to clean up after oid list field " +
"[target=" + target + ", field=" + field + "].");
}
}
@@ -571,13 +578,13 @@ public class PresentsDObjectMgr
// object which no longer exists; so we don't complain about non-
// existent references if the referree is already destroyed
if (ref == null && _objects.containsKey(reffedOid)) {
Log.warning("Requested to clear out non-existent reference " +
log.warning("Requested to clear out non-existent reference " +
"[refferOid=" + reffer.getOid() +
", field=" + field +
", reffedOid=" + reffedOid + "].");
// } else {
// Log.info("Cleared out reference " + ref + ".");
// log.info("Cleared out reference " + ref + ".");
}
}
@@ -595,7 +602,7 @@ public class PresentsDObjectMgr
// ensure that the target object exists
if (!_objects.containsKey(oid)) {
Log.info("Rejecting object added event of non-existent object " +
log.info("Rejecting object added event of non-existent object " +
"[refferOid=" + target.getOid() +
", reffedOid=" + oid + "].");
return false;
@@ -615,7 +622,7 @@ public class PresentsDObjectMgr
int rpos = -1;
for (int i = 0; i < refs.length; i++) {
if (ref.equals(refs[i])) {
Log.warning("Ignoring request to track existing " +
log.warning("Ignoring request to track existing " +
"reference " + ref + ".");
return true;
} else if (refs[i] == null && rpos == -1) {
@@ -634,7 +641,7 @@ public class PresentsDObjectMgr
// finally add the reference
refs[rpos] = ref;
// Log.info("Tracked reference " + ref + ".");
// log.info("Tracked reference " + ref + ".");
return true;
}
@@ -652,7 +659,7 @@ public class PresentsDObjectMgr
int toid = target.getOid();
int oid = ore.getOid();
// Log.info("Processing object removed [from=" + toid +
// log.info("Processing object removed [from=" + toid +
// ", roid=" + toid + "].");
// get the reference vector for the referenced object
@@ -663,7 +670,7 @@ public class PresentsDObjectMgr
// generate object removed events for all of its referencees.
// so we opt not to log anything in this case
// Log.info("Object removed without reference to track it " +
// log.info("Object removed without reference to track it " +
// "[toid=" + toid + ", field=" + field +
// ", oid=" + oid + "].");
return true;
@@ -673,13 +680,13 @@ public class PresentsDObjectMgr
for (int i = 0; i < refs.length; i++) {
Reference ref = refs[i];
if (ref != null && ref.equals(toid, field)) {
// Log.info("Removed reference " + refs[i] + ".");
// log.info("Removed reference " + refs[i] + ".");
refs[i] = null;
return true;
}
}
Log.warning("Unable to locate reference for removal " +
log.warning("Unable to locate reference for removal " +
"[reffingOid=" + toid + ", field=" + field +
", reffedOid=" + oid + "].");
return true;
@@ -711,7 +718,7 @@ public class PresentsDObjectMgr
return _nextOid;
}
// documentation inherited from interface PresentsServer.Reporter
// from interface PresentsServer.Reporter
public void appendReport (
StringBuilder report, long now, long sinceLast, boolean reset)
{
@@ -751,85 +758,12 @@ public class PresentsDObjectMgr
try {
sub.objectAvailable(obj);
} catch (Exception e) {
Log.warning("Subscriber choked during object available " +
"[obj=" + StringUtil.safeToString(obj) +
", sub=" + sub + "].");
Log.logStackTrace(e);
log.log(Level.WARNING, "Subscriber choked during object " +
"available [obj=" + StringUtil.safeToString(obj) +
", sub=" + sub + "].", e);
}
}
/**
* Used to create a distributed object and register it with the
* system.
*/
protected class CreateObjectEvent<T extends DObject> extends DEvent
{
public CreateObjectEvent (Class<T> clazz, Subscriber<T> target)
{
super(0); // target the fake object
_class = clazz;
_target = target;
}
public boolean isPrivate ()
{
return true;
}
public boolean applyToObject (DObject target)
throws ObjectAccessException
{
int oid = getNextOid();
T obj = null;
try {
// create a new instance of this object
obj = _class.newInstance();
// initialize this object
obj.setOid(oid);
obj.setManager(PresentsDObjectMgr.this);
obj.setAccessController(_defaultController);
// insert it into the table
_objects.put(oid, obj);
// Log.info("Created object [obj=" + obj + "].");
} catch (Exception e) {
Log.warning("Object creation failure " +
"[class=" + _class.getName() +
", error=" + e + "].");
// let the subscriber know shit be fucked
if (_target != null) {
String errmsg = "Object instantiation failed";
_target.requestFailed(
oid, new ObjectAccessException(errmsg, e));
}
return false;
}
if (_target != null) {
// add the subscriber to this object's subscriber list
obj.addSubscriber(_target);
// let the target subscriber know that their object is
// available
informObjectAvailable(_target, obj);
}
// and return false to ensure that this event is not
// dispatched to the fake object's subscriber list (even
// though it's empty)
return false;
}
protected transient Class<T> _class;
protected transient Subscriber<T> _target;
}
/**
* Used to make an object available to a subscriber (with or without
* the associated subscription).
@@ -916,7 +850,7 @@ public class PresentsDObjectMgr
_helpers.put(ObjectRemovedEvent.class, method);
} catch (Exception e) {
Log.warning("Unable to register event helpers " +
log.warning("Unable to register event helpers " +
"[error=" + e + "].");
}
}