01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package com.db4o.internal.cs.messages;
22:
23: import com.db4o.config.*;
24: import com.db4o.ext.*;
25: import com.db4o.internal.query.processor.*;
26: import com.db4o.internal.query.result.*;
27:
28: public final class MQueryExecute extends MsgQuery implements
29: ServerSideMessage {
30:
31: private QueryEvaluationMode _evaluationMode;
32:
33: public boolean processAtServer() {
34: try {
35: unmarshall(_payLoad._offset);
36: writeQueryResult(execute(), _evaluationMode);
37: } catch (Db4oException e) {
38: writeException(e);
39: }
40: return true;
41: }
42:
43: private AbstractQueryResult execute() {
44:
45: synchronized (streamLock()) {
46:
47: // TODO: The following used to run outside of the
48: // synchronisation block for better performance but
49: // produced inconsistent results, cause unknown.
50:
51: QQuery query = (QQuery) readObjectFromPayLoad();
52: query.unmarshall(transaction());
53:
54: _evaluationMode = query.evaluationMode();
55:
56: return executeFully(query);
57:
58: }
59: }
60:
61: private AbstractQueryResult executeFully(QQuery query) {
62: AbstractQueryResult qr = newQueryResult(query.evaluationMode());
63: qr.loadFromQuery(query);
64: return qr;
65: }
66:
67: }
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