com.threerings.crowd.server.PlaceManager Maven / Gradle / Ivy
//
// $Id: PlaceManager.java 6683 2011-07-07 21:33:20Z charlie $
//
// Narya library - tools for developing networked games
// Copyright (C) 2002-2011 Three Rings Design, Inc., All Rights Reserved
// http://code.google.com/p/narya/
//
// This library is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License as published
// by the Free Software Foundation; either version 2.1 of the License, or
// (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package com.threerings.crowd.server;
import java.util.List;
import java.util.Map;
import com.google.common.collect.Lists;
import com.google.common.collect.Maps;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.samskivert.util.HashIntMap;
import com.samskivert.util.Interval;
import com.samskivert.util.MethodFinder;
import com.samskivert.util.StringUtil;
import com.threerings.presents.data.ClientObject;
import com.threerings.presents.data.InvocationMarshaller;
import com.threerings.presents.dobj.AccessController;
import com.threerings.presents.dobj.DObject;
import com.threerings.presents.dobj.DSet;
import com.threerings.presents.dobj.DynamicListener;
import com.threerings.presents.dobj.EntryUpdatedEvent;
import com.threerings.presents.dobj.MessageEvent;
import com.threerings.presents.dobj.MessageListener;
import com.threerings.presents.dobj.NamedSetAdapter;
import com.threerings.presents.dobj.ObjectAddedEvent;
import com.threerings.presents.dobj.ObjectDeathListener;
import com.threerings.presents.dobj.ObjectDestroyedEvent;
import com.threerings.presents.dobj.ObjectRemovedEvent;
import com.threerings.presents.dobj.OidListListener;
import com.threerings.presents.dobj.RootDObjectManager;
import com.threerings.presents.dobj.SetAdapter;
import com.threerings.presents.server.InvocationDispatcher;
import com.threerings.presents.server.InvocationManager;
import com.threerings.presents.server.InvocationProvider;
import com.threerings.crowd.chat.data.ChatCodes;
import com.threerings.crowd.chat.data.SpeakMarshaller;
import com.threerings.crowd.chat.server.SpeakHandler;
import com.threerings.crowd.data.BodyObject;
import com.threerings.crowd.data.OccupantInfo;
import com.threerings.crowd.data.Place;
import com.threerings.crowd.data.PlaceConfig;
import com.threerings.crowd.data.PlaceObject;
import com.threerings.crowd.server.CrowdObjectAccess.PlaceAccessController;
import static com.threerings.crowd.Log.log;
/**
* The place manager is the server-side entity that handles all place-related interaction. It
* subscribes to the place object and reacts to message and other events. Behavior specific to a
* place (or class of places) should live in the place manager. An intelligently constructed
* hierarchy of place manager classes working in concert with invocation services should provide
* the majority of the server-side functionality of an application built on the Presents platform.
*
* The base place manager class takes care of the necessary interactions with the place
* registry to manage place registration. It handles the place-related component of chatting. It
* also provides the basis for place-based access control.
*
*
A derived class is expected to handle initialization, cleanup and operational functionality
* via the calldown functions {@link #didInit}, {@link #didStartup}, and {@link #didShutdown} as
* well as through event listeners.
*/
public class PlaceManager
implements MessageListener, SpeakHandler.SpeakerValidator
{
/**
* An interface used to allow the registration of standard message handlers to be invoked by
* the place manager when particular types of message events are received.
*
* @deprecated Use dynamically bound methods instead. See {@link DynamicListener}.
*/
@Deprecated
public static interface MessageHandler
{
/**
* Invokes this message handler on the supplied event.
*
* @param event the message event received.
* @param pmgr the place manager for which the message is being handled.
*/
void handleEvent (MessageEvent event, PlaceManager pmgr);
}
/**
* Used to call methods on this place manager's delegates.
*/
public static abstract class DelegateOp
{
public DelegateOp (Class delegateClass) {
_delegateClass = delegateClass;
}
/** Applies an operation to the supplied delegate. */
public abstract void apply (PlaceManagerDelegate delegate);
public boolean shouldApply (PlaceManagerDelegate delegate) {
return _delegateClass.isInstance(delegate);
}
protected Class _delegateClass;
}
/**
* Returns a reference to our place configuration object.
*/
public PlaceConfig getConfig ()
{
return _config;
}
/**
* Returns a {@link Place} instance that identifies this place.
*/
public Place getLocation ()
{
return new Place(_plobj.getOid());
}
/**
* Returns the place object managed by this place manager.
*/
public PlaceObject getPlaceObject ()
{
return _plobj;
}
/**
* Applies the supplied occupant operation to each occupant currently present in this place.
*/
public void applyToOccupants (OccupantOp op)
{
if (_plobj != null) {
for (OccupantInfo info : _plobj.occupantInfo) {
op.apply(info);
}
}
}
/**
* Calls the supplied updater on the canonical occupant info record for the specified body
* (which must be an occupant of this place) and broadcasts the update to all other occupants.
*
* @return true if the updater was called and the update sent, false if the body could not be
* located (was not an occupant of this place) or the updater made no modifications.
*
* @exception ClassCastException thrown if the type of the supplied updater does not match the
* type of {@link OccupantInfo} record used for the occupant. Caveat utilitor.
*/
public boolean updateOccupantInfo (
int bodyOid, OccupantInfo.Updater updater)
{
@SuppressWarnings("unchecked") T info = (T)_occInfo.get(bodyOid);
if (info == null || !updater.update(info)) {
return false;
}
// update the canonical copy
_occInfo.put(info.getBodyOid(), info);
// clone the canonical copy and send an event updating the distributed set with that clone
_plobj.updateOccupantInfo(info.clone());
return true;
}
/**
* Called by the place registry after creating this place manager.
*/
public void init (PlaceRegistry registry, InvocationManager invmgr, RootDObjectManager omgr,
BodyLocator locator, PlaceConfig config)
{
_registry = registry;
_invmgr = invmgr;
_omgr = omgr;
_locator = locator;
_config = config;
// initialize our delegates
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override
public void apply (PlaceManagerDelegate delegate) {
delegate.init(PlaceManager.this, _omgr, _invmgr);
}
});
// let derived classes do initialization stuff
try {
didInit();
} catch (Throwable t) {
log.warning("Manager choked in didInit()", "where", where(), t);
}
}
/**
* Adds the supplied delegate to the list for this manager.
*/
public void addDelegate (PlaceManagerDelegate delegate)
{
if (_delegates == null) {
_delegates = Lists.newArrayList();
}
if (_omgr != null) {
delegate.init(this, _omgr, _invmgr);
delegate.didInit(_config);
}
_delegates.add(delegate);
}
/**
* Applies the supplied operation to this manager's registered delegates.
*/
public void applyToDelegates (DelegateOp op)
{
if (_delegates != null) {
for (int ii = 0, ll = _delegates.size(); ii < ll; ii++) {
PlaceManagerDelegate delegate = _delegates.get(ii);
if (op.shouldApply(delegate)) {
op.apply(delegate);
}
}
}
}
/**
* Provides an opportunity for place managers to ratify the creation of a place based on
* whatever criterion they may require (based on information available to the manager at this
* post-init() but pre-startup() phase of initialization).
*
* @return If a permissions check is to fail, the manager should return a translatable string
* explaining the failure. null should be returned if initialization is to be
* allowed to proceed.
*/
public String checkPermissions ()
{
return null;
}
/**
* Called by the place manager after the place object has been successfully created.
*/
public void startup (PlaceObject plobj)
{
// keep track of this
_plobj = plobj;
// we usually want to create and register a speaker service instance that clients can use
// to speak in this place
if (shouldCreateSpeakService()) {
plobj.setSpeakService(addProvider(createSpeakHandler(plobj), SpeakMarshaller.class));
}
// we'll need to hear about place object events
plobj.addListener(this);
plobj.addListener(_bodyUpdater);
plobj.addListener(_occListener);
plobj.addListener(_deathListener);
// configure this place's access controller
plobj.setAccessController(getAccessController());
// let our derived classes do their thang
try {
didStartup();
} catch (Throwable t) {
log.warning("Manager choked in didStartup()", "where", where(), t);
}
// since we start empty, we need to immediately assume shutdown
checkShutdownInterval();
}
/**
* Causes the place object being managed by this place manager to be destroyed and the place
* manager to shut down.
*/
public void shutdown ()
{
// destroy the object and everything will follow from that
_omgr.destroyObject(_plobj.getOid());
// make sure we don't have any shutdowner in the queue
cancelShutdowner();
}
/**
* Provides an opportunity for the place manager to prevent bodies from entering.
*
* @return null if the body can enter, otherwise a translatable message explaining
* the reason the body is blocked from entering
*/
public String ratifyBodyEntry (BodyObject body)
{
return null;
}
/**
* This is called to inform the manager that a body is on the way in. This is called at the
* very beginning of the entry process before the client is informed that it is allowed to
* enter. This will be followed by a call to {@link #bodyEntered} once all events relating to
* body entry have been processed.
*/
public void bodyWillEnter (BodyObject body)
{
// create a new occupant info instance and insert it into our canonical table
OccupantInfo info = body.createOccupantInfo(_plobj);
_occInfo.put(info.getBodyOid(), info);
_plobj.startTransaction();
try {
addOccupantInfo(body, info.clone());
} finally {
_plobj.commitTransaction();
}
}
/**
* Called to inform a manager that a body is about to leave this place. This will be followed
* by a call to {@link #bodyLeft} once all events relating to body entry have been processed.
*/
public void bodyWillLeave (BodyObject body)
{
_plobj.startTransaction();
try {
// remove their occupant info (which is keyed on oid)
_plobj.removeFromOccupantInfo(body.getOid());
// and remove them from the occupant list
_plobj.removeFromOccupants(body.getOid());
} finally {
_plobj.commitTransaction();
}
}
/**
* Registers a particular message handler instance to be used when processing message events
* with the specified name.
*
* @param name the message name of the message events that should be handled by this handler.
* @param handler the handler to be registered.
*
* @deprecated Use dynamically bound methods instead. See {@link DynamicListener}.
*/
@Deprecated
public void registerMessageHandler (String name, MessageHandler handler)
{
// create our handler map if necessary
if (_msghandlers == null) {
_msghandlers = Maps.newHashMap();
}
_msghandlers.put(name, handler);
}
// from interface MessageListener
public void messageReceived (MessageEvent event)
{
if (_msghandlers != null) {
MessageHandler handler = _msghandlers.get(event.getName());
if (handler != null) {
handler.handleEvent(event, this);
}
}
// If the message is directed at us, see if it's a request for a method invocation
if (event.isPrivate()) { // aka if (event instanceof ServerMessageEvent)
// the first argument should be the client object of the caller or null if it is
// a server-originated event
int srcoid = event.getSourceOid();
DObject source = (srcoid <= 0) ? null : _omgr.getObject(srcoid);
Object[] args = event.getArgs(), nargs;
if (args == null) {
nargs = new Object[] { source };
} else {
nargs = new Object[args.length+1];
nargs[0] = source;
System.arraycopy(args, 0, nargs, 1, args.length);
}
// Lazily create our dispatcher now that it's actually getting a message
if (_dispatcher == null) {
Class clazz = getClass();
MethodFinder finder = _dispatcherFinders.get(clazz);
if (finder == null) {
finder = new MethodFinder(clazz);
_dispatcherFinders.put(clazz, finder);
}
_dispatcher = new DynamicListener(this, finder);
}
_dispatcher.dispatchMethod(event.getName(), nargs);
}
}
// documentation inherited from interface
public boolean isValidSpeaker (DObject speakObj, ClientObject speaker, byte mode)
{
// have a whitelist for valid modes (no broadcasting, that's done elsewhere)
switch (mode) {
default:
return false;
case ChatCodes.DEFAULT_MODE:
case ChatCodes.THINK_MODE:
case ChatCodes.EMOTE_MODE:
case ChatCodes.SHOUT_MODE:
break;
}
// only allow people in the room to speak.
return _plobj.occupants.contains(speaker.getOid());
}
/**
* Returns a string that can be used in log messages to identify the place as sensibly as
* possible to the developer who has to puzzle over log output trying to figure out what's
* going on. Derived place managers can override this and augment the default value (which is
* simply the place object id) with useful identifying information.
*/
public String where ()
{
return (_plobj == null) ? StringUtil.shortClassName(this) + ":-1" : _plobj.which();
}
/**
* Generates a string representation of this manager. Does so in a way that makes it easier for
* derived classes to add to the string representation.
*
* @see #toString(StringBuilder)
*/
@Override
public String toString ()
{
StringBuilder buf = new StringBuilder();
buf.append("[");
toString(buf);
buf.append("]");
return buf.toString();
}
/**
* Derived classes will generally override this method to create a custom {@link PlaceObject}
* derivation that contains extra information.
*/
protected PlaceObject createPlaceObject ()
{
try {
return getPlaceObjectClass().newInstance();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* @deprecated Use {@link #createPlaceObject}.
*/
@Deprecated
protected Class getPlaceObjectClass ()
{
return PlaceObject.class;
}
/**
* Called after this place manager has been initialized with its configuration information but
* before it has been started up with its place object reference. Derived classes can override
* this function and perform any basic initialization that they desire. They should of course
* be sure to call super.didInit().
*/
protected void didInit ()
{
// initialize our delegates
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override
public void apply (PlaceManagerDelegate delegate) {
delegate.didInit(_config);
}
});
}
/**
* Called if the permissions check failed, to give place managers a chance to do any cleanup
* that might be necessary due to their early initialization or permissions checking code.
*/
protected void permissionsFailed ()
{
}
/**
* @return true if we should create a speaker service for our place object so that clients can
* use it to speak in this place.
*/
protected boolean shouldCreateSpeakService ()
{
return true;
}
/**
* Creates an access controller for this place's distributed object, which by default is {@link
* PlaceAccessController}.
*/
protected AccessController getAccessController ()
{
return _injector.getInstance(PlaceAccessController.class);
}
/**
* Derived classes should override this (and be sure to call super.didStartup())
* to perform any startup time initialization. The place object will be available by the time
* this method is executed.
*/
protected void didStartup ()
{
// let our delegates know that we've started up
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override
public void apply (PlaceManagerDelegate delegate) {
delegate.didStartup(_plobj);
}
});
}
/**
* Called when this place has been destroyed and the place manager has shut down (via a call to
* {@link #shutdown}). Derived classes can override this method and perform any necessary
* shutdown time processing.
*/
protected void didShutdown ()
{
// clear out our listenership
_plobj.removeListener(this);
_plobj.removeListener(_bodyUpdater);
_plobj.removeListener(_occListener);
_plobj.removeListener(_deathListener);
// clear out our invocation service registrations
for (InvocationMarshaller marsh : _marshallers) {
_invmgr.clearDispatcher(marsh);
}
// let our delegates know that we've shut down
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override
public void apply (PlaceManagerDelegate delegate) {
delegate.didShutdown();
}
});
// if shutting down emptied the place and scheduled the shutdowner, clear that out
cancelShutdowner();
}
/**
* Registers an invocation provider and notes the registration such that it will be
* automatically cleared when this manager shuts down.
*/
protected > T addProvider (
InvocationProvider prov, Class mclass)
{
T marsh = _invmgr.registerProvider(prov, mclass);
_marshallers.add(marsh);
return marsh;
}
/**
* Registers an invocation dispatcher and notes the registration such that it will be
* automatically cleared when this manager shuts down.
*/
protected > T addDispatcher (InvocationDispatcher disp)
{
T marsh = _invmgr.registerDispatcher(disp);
_marshallers.add(marsh);
return marsh;
}
/**
* Called when a body object enters this place.
*/
protected void bodyEntered (final int bodyOid)
{
log.debug("Body entered", "where", where(), "oid", bodyOid);
// let our delegates know what's up
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override
public void apply (PlaceManagerDelegate delegate) {
delegate.bodyEntered(bodyOid);
}
});
// if we were on the road to shutting down, step off
cancelShutdowner();
}
/**
* Called when a body object leaves this place.
*/
protected void bodyLeft (final int bodyOid)
{
log.debug("Body left", "where", where(), "oid", bodyOid);
// if their occupant info hasn't been removed (which may be the case if they logged off
// rather than left via a MoveTo request), we need to get it on out of here
Integer key = Integer.valueOf(bodyOid);
if (_plobj.occupantInfo.containsKey(key)) {
_plobj.removeFromOccupantInfo(key);
}
// clear out their canonical (local) occupant info record
OccupantInfo leaver = _occInfo.remove(bodyOid);
// let our delegates know what's up
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override public void apply (PlaceManagerDelegate delegate) {
delegate.bodyLeft(bodyOid);
}
});
// if that leaves us with zero occupants, maybe do something
if (shouldDeclareEmpty(leaver)) {
placeBecameEmpty();
}
}
/**
* Adds this occupant's info to the {@link PlaceObject}. This is called in a transaction on the
* place object so if a derived class needs to add additional information for an occupant it
* should override this method. It may opt to add the information before calling super if it
* wishes to rely on its information being configured when {@link #bodyEntered} is called.
*/
protected void addOccupantInfo (BodyObject body, OccupantInfo info)
{
// clone the canonical copy and insert it into the DSet
_plobj.addToOccupantInfo(info);
// add the body oid to our place object's occupant list
_plobj.addToOccupants(body.getOid());
}
/**
* Returns whether the location should be marked as empty and potentially shutdown.
*/
protected boolean shouldDeclareEmpty (OccupantInfo leaver)
{
return (_plobj.occupants.size() == 0);
}
/**
* Called when a body's occupant info is updated.
*/
protected void bodyUpdated (final OccupantInfo info)
{
// let our delegates know what's up
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override
public void apply (PlaceManagerDelegate delegate) {
delegate.bodyUpdated(info);
}
});
}
/**
* Called when we transition from having bodies in the place to not having any bodies in the
* place. Some places may take this as a sign to pack it in, others may wish to stick
* around. In any case, they can override this method to do their thing.
*/
protected void placeBecameEmpty ()
{
// let our delegates know what's up
applyToDelegates(new DelegateOp(PlaceManagerDelegate.class) {
@Override
public void apply (PlaceManagerDelegate delegate) {
delegate.placeBecameEmpty();
}
});
// Log.info("Place became empty " + where() + ".");
checkShutdownInterval();
}
/**
* Called on startup and when the place is empty.
*/
protected void checkShutdownInterval ()
{
// queue up a shutdown interval, unless we've already got one.
long idlePeriod = idleUnloadPeriod();
if (idlePeriod > 0L && _shutdownInterval == null) {
(_shutdownInterval = _omgr.newInterval(new Runnable() {
public void run () {
log.debug("Unloading idle place '" + where() + "'.");
shutdown();
}
})).schedule(idlePeriod);
}
}
/**
* Cancels any registered shutdown interval.
*/
protected void cancelShutdowner ()
{
if (_shutdownInterval != null) {
_shutdownInterval.cancel();
_shutdownInterval = null;
}
}
/**
* Returns the period (in milliseconds) of emptiness after which this place manager will unload
* itself and shutdown. Returning 0 indicates that the place should never be
* shutdown.
*/
protected long idleUnloadPeriod ()
{
return 5 * 60 * 1000L;
}
/**
* An extensible way to add to the string representation of this class. Override this (being
* sure to call super) and append your info to the buffer.
*/
protected void toString (StringBuilder buf)
{
buf.append("place=").append(_plobj);
buf.append(", config=").append(_config);
}
/**
* Creates the speak handler for this place. Derived classes can customize the speak handler if
* they so desire.
*/
protected SpeakHandler createSpeakHandler (PlaceObject plobj)
{
return new SpeakHandler(_locator, plobj, this);
}
/** Listens for occupant updates. */
protected SetAdapter _bodyUpdater =
new NamedSetAdapter(PlaceObject.OCCUPANT_INFO) {
@Override
public void namedEntryUpdated (EntryUpdatedEvent event) {
bodyUpdated(event.getEntry());
}
};
/** Listens for body entry and departure. */
protected OidListListener _occListener = new OidListListener() {
public void objectAdded (ObjectAddedEvent event) {
if (event.getName().equals(PlaceObject.OCCUPANTS)) {
bodyEntered(event.getOid());
}
}
public void objectRemoved (ObjectRemovedEvent event) {
if (event.getName().equals(PlaceObject.OCCUPANTS)) {
bodyLeft(event.getOid());
}
}
};
/** Listens for death of our place object. */
protected ObjectDeathListener _deathListener = new ObjectDeathListener() {
public void objectDestroyed (ObjectDestroyedEvent event) {
// unregister ourselves
_registry.unmapPlaceManager(PlaceManager.this);
// let our derived classes and delegates shut themselves down
try {
didShutdown();
} catch (Throwable t) {
log.warning("Manager choked in didShutdown()", "where", where(), t);
}
}
};
/** We use this to inject dependencies into our access controller. */
@Inject protected Injector _injector;
/** A reference to the place registry with which we're registered. */
protected PlaceRegistry _registry;
/** The invocation manager with whom we register our game invocation services. */
protected InvocationManager _invmgr;
/** A distributed object manager for doing dobj stuff. */
protected RootDObjectManager _omgr;
/** Used to look up body objects by name. */
protected BodyLocator _locator;
/** A reference to the place object that we manage. */
protected PlaceObject _plobj;
/** A reference to the configuration for our place. */
protected PlaceConfig _config;
/** Message handlers are used to process message events. */
protected Map _msghandlers;
/** A list of the delegates in use by this manager. */
protected List _delegates;
/** A list of services registered with {@link #addProvider} which will be automatically
* cleared when this manager shuts down. */
protected List> _marshallers = Lists.newArrayList();
/** Used to keep a canonical copy of the occupant info records. */
protected HashIntMap _occInfo = new HashIntMap();
/** The interval currently registered to shut this place down after a certain period of
* idility, or null if no interval is currently registered. */
protected Interval _shutdownInterval;
/** Used to do method lookup magic when we receive message events. */
protected DynamicListener _dispatcher;
/** Maps from a PlaceManager subclass to a MethodFinder for it. When there are many many
* instances of a PlaceManager in existence, having a MethodFinder instance for each gets quite
* expensive. */
protected static Map, MethodFinder> _dispatcherFinders = Maps.newHashMap();
}