]> gerrit.simantics Code Review - simantics/platform.git/blob - bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/genericrelation/Dependencies.java
Fixed multiple issues causing dangling references to discarded queries
[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / genericrelation / Dependencies.java
1 /*******************************************************************************
2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management
3  * in Industry THTH ry.
4  * All rights reserved. This program and the accompanying materials
5  * are made available under the terms of the Eclipse Public License v1.0
6  * which accompanies this distribution, and is available at
7  * http://www.eclipse.org/legal/epl-v10.html
8  *
9  * Contributors:
10  *     VTT Technical Research Centre of Finland - initial API and implementation
11  *******************************************************************************/
12 package org.simantics.db.layer0.genericrelation;
13
14 import org.simantics.db.ReadGraph;
15 import org.simantics.db.Resource;
16 import org.simantics.db.common.request.UniqueRead;
17 import org.simantics.db.exception.DatabaseException;
18 import org.simantics.db.layer0.adapter.GenericRelationIndex;
19 import org.simantics.db.service.QueryControl;
20 import org.simantics.operation.Layer0X;
21 import org.simantics.scl.runtime.function.FunctionImpl4;
22 import org.simantics.scl.runtime.function.UnsaturatedFunction2;
23 import org.slf4j.LoggerFactory;
24
25 /**
26  * dependencies:
27  *      (ReadGraph, Resource model, String query) -> List<Map<String, Object>>
28  *      (ReadGraph, Resource model, String query, Integer maxResults) -> List<Map<String, Object>>
29  * 
30  * @author Antti Villberg
31  */
32 public class Dependencies extends FunctionImpl4<ReadGraph, Resource, String, Integer, Object> {
33
34     private static final org.slf4j.Logger LOGGER = LoggerFactory.getLogger(Dependencies.class);
35
36     public static final String FIELD_MODEL    = "Model";
37     public static final String FIELD_PARENT   = "Parent";
38     public static final String FIELD_RESOURCE = "Resource";
39     public static final String FIELD_NAME     = "Name";
40     public static final String FIELD_TYPES    = "Types";
41     public static final String FIELD_GUID    = "GUID";
42     public static final String FIELD_NAME_SEARCH = "NameSearch";
43     public static final String FIELD_TYPES_SEARCH = "TypesSearch";
44     public static final String FIELD_TYPE_RESOURCE = "TypeId";
45
46     protected Resource getIndexRelation(ReadGraph graph) {
47         return Layer0X.getInstance(graph).DependenciesRelation;
48     }
49
50     protected static String getBindingPattern() {
51         return "bffffffff";
52     }
53
54     @Override
55     public Object apply(ReadGraph p0, Resource p1) {
56         return new UnsaturatedFunction2(this, p0, p1);
57     }
58
59     @Override
60     public Object apply(ReadGraph p0, Resource p1, String p2) {
61         return apply(p0, p1, p2, Integer.MAX_VALUE);
62     }
63
64     @Override
65     public Object apply(ReadGraph graph, final Resource model, final String query, Integer _maxResults) {
66         
67         try {
68
69             final GenericRelationIndex index = graph.adapt(getIndexRelation(graph), GenericRelationIndex.class);
70
71             // Listen
72             graph.syncRequest(new ExternalRequest(index, model));
73             
74             final int maxResults = _maxResults != null ? _maxResults : Integer.MAX_VALUE;
75             
76             QueryControl qc = graph.getService(QueryControl.class);
77             return qc.syncRequestIndependent(graph, new UniqueRead<Object>() {
78                 @Override
79                 public Object perform(ReadGraph graph) throws DatabaseException {
80                     return index.query(graph, query, getBindingPattern(), new Object[] { model }, maxResults);
81                 }
82             });
83             
84         } catch (DatabaseException e) {
85             LOGGER.error("Error while performing index query", e);
86             return null;
87         }
88     }
89
90 }