Convert Narya (most of the way) over to a Maven Ant task based build. The

ActionScript bits remain belligerent, but the Java stuff is mostly shipshape.


git-svn-id: svn+ssh://src.earth.threerings.net/narya/trunk@6222 542714f4-19e9-0310-aa3c-eee0fc999fb1

src/main/java/com/threerings/presents/dobj/CompoundEvent.java

@@ -0,0 +1,192 @@
+//
+// $Id$
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2010 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.presents.dobj;
+
+import java.util.List;
+
+import com.threerings.util.StreamableArrayList;
+
+import com.threerings.presents.net.Transport;
+
+/**
+ * Used to manage and submit groups of events on a collection of distributed objects in a single
+ * transaction.
+ *
+ * @see DObject#startTransaction
+ */
+public class CompoundEvent extends DEvent
+{
+    /**
+     * Constructs a blank compound event in preparation for unserialization.
+     */
+    public CompoundEvent ()
+    {
+    }
+
+    /**
+     * Constructs a compound event and prepares it for operation.
+     */
+    public CompoundEvent (DObject target, DObjectManager omgr)
+    {
+        super(target.getOid());
+
+        // sanity check
+        if (omgr == null) {
+            String errmsg = "Must receive non-null object manager reference";
+            throw new IllegalArgumentException(errmsg);
+        }
+
+        _omgr = omgr;
+        _target = target;
+        _events = StreamableArrayList.newList();
+    }
+
+    /**
+     * Posts an event to this transaction. The event will be delivered as part of the entire
+     * transaction if it is committed or discarded if the transaction is cancelled.
+     */
+    public void postEvent (DEvent event)
+    {
+        _events.add(event);
+    }
+
+    /**
+     * Returns the list of events contained within this compound event.
+     *
+     * Don't mess with it.
+     */
+    public List<DEvent> getEvents ()
+    {
+        return _events;
+    }
+
+    /**
+     * Commits this transaction by posting this event to the distributed object event queue. All
+     * participating dobjects will have their transaction references cleared and will go back to
+     * normal operation.
+     */
+    public void commit ()
+    {
+        // first clear our target
+        clearTarget();
+
+        // then post this event onto the queue (but only if we actually
+        // accumulated some events)
+        int size = _events.size();
+        switch (size) {
+        case 0: // nothing doing
+            break;
+        case 1: // no point in being compound
+            _omgr.postEvent(_events.get(0));
+            break;
+        default: // now we're talking
+            _transport = _events.get(0).getTransport();
+            for (int ii = 1; ii < size; ii++) {
+                _transport = _events.get(ii).getTransport().combine(_transport);
+            }
+            _omgr.postEvent(this);
+            break;
+        }
+    }
+
+    /**
+     * Cancels this transaction. All events posted to this transaction will be discarded.
+     */
+    public void cancel ()
+    {
+        // clear our target
+        clearTarget();
+        // clear our event queue in case someone holds onto us
+        _events.clear();
+    }
+
+    @Override
+    public void setSourceOid (int sourceOid)
+    {
+        super.setSourceOid(sourceOid);
+
+        // we need to propagate our source oid to our constituent events
+        int ecount = _events.size();
+        for (int ii = 0; ii < ecount; ii++) {
+            _events.get(ii).setSourceOid(sourceOid);
+        }
+    }
+
+    @Override
+    public void setTargetOid (int targetOid)
+    {
+        super.setTargetOid(targetOid);
+
+        // we need to propagate our target oid to our constituent events
+        int ecount = _events.size();
+        for (int ii = 0; ii < ecount; ii++) {
+            _events.get(ii).setTargetOid(targetOid);
+        }
+    }
+
+    @Override
+    public void setTransport (Transport transport)
+    {
+        super.setTransport(transport);
+        for (int ii = 0, nn = _events.size(); ii < nn; ii++) {
+            _events.get(ii).setTransport(transport);
+        }
+    }
+
+    @Override
+    public boolean applyToObject (DObject target)
+        throws ObjectAccessException
+    {
+        // nothing to apply here
+        return false;
+    }
+
+    /**
+     * Calls out to our target object, clearing its transaction reference.
+     */
+    protected void clearTarget ()
+    {
+        if (_target != null) {
+            _target.clearTransaction();
+            _target = null;
+        }
+    }
+
+    @Override
+    protected void toString (StringBuilder buf)
+    {
+        buf.append("COMPOUND:");
+        super.toString(buf);
+        for (int ii = 0; ii < _events.size(); ii++) {
+            buf.append(", ").append(_events.get(ii));
+        }
+    }
+
+    /** The object manager that we'll post ourselves to when we're committed. */
+    protected transient DObjectManager _omgr;
+
+    /** The object for which we're managing a transaction. */
+    protected transient DObject _target;
+
+    /** A list of the events associated with this compound event. */
+    protected StreamableArrayList<DEvent> _events;
+}