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Layer0Utils.addL0Identifier to prevent possible differentiation of code
[simantics/platform.git] / bundles / org.simantics.db.layer0 / src / org / simantics / db / layer0 / util / SessionGarbageCollection.java
1 /*******************************************************************************
2  * Copyright (c) 2007, 2011 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.util;
13
14 import java.util.function.Consumer;
15
16 import org.eclipse.core.runtime.IProgressMonitor;
17 import org.eclipse.core.runtime.NullProgressMonitor;
18 import org.simantics.db.ReadGraph;
19 import org.simantics.db.Session;
20 import org.simantics.db.WriteGraph;
21 import org.simantics.db.common.request.WriteRequest;
22 import org.simantics.db.common.utils.Logger;
23 import org.simantics.db.exception.DatabaseException;
24 import org.simantics.db.service.ClusterControl;
25 import org.simantics.db.service.LifecycleSupport;
26 import org.simantics.db.service.QueryControl;
27 import org.simantics.utils.DataContainer;
28 import org.simantics.utils.datastructures.Callback;
29
30 /**
31  * @author Tuukka Lehtonen
32  */
33 public class SessionGarbageCollection {
34     /**
35      * collect everything possible, default target is 0 queries.
36      */
37     private static int DEFAULT_ALLOWED_TIME = 300;
38     public static int getDefaultQueryTarget() {
39         return DEFAULT_ALLOWED_TIME;
40     }
41     public static void setDefaultAllowedTime(int a) {
42         DEFAULT_ALLOWED_TIME = a;
43     }
44     /**
45      * Default maximum cluster memory consumption target is 32MB.
46      */
47     private static int DEFAULT_CLUSTER_TARGET = -1;
48     public static int getDefaultClusterTarget() {
49         return DEFAULT_CLUSTER_TARGET;
50     }
51     public static void setDefaultClusterTarget(int a) {
52         DEFAULT_CLUSTER_TARGET = a;
53     }
54     /**
55      * @param monitor <code>null</code> if progress monitor not available
56      * @param session the session to GC
57      * @param sync <code>true</code> to block until gc is completed
58      * @param errorCallback callback for any errors occuring during the
59      *        operation or <code>null</code> to ignore errors
60      */
61     public static boolean gc(IProgressMonitor monitor, Session session, boolean sync,
62             final Consumer<DatabaseException> errorCallback) {
63         long took = gc(monitor, session, sync, errorCallback, DEFAULT_ALLOWED_TIME, DEFAULT_CLUSTER_TARGET);
64         return ((16*took) / DEFAULT_ALLOWED_TIME) > 15;
65     }
66     
67     public static void gc(ReadGraph graph, final int allowedTimeInMs, final int clusterTarget) throws DatabaseException {
68         doIt(null, graph, allowedTimeInMs, clusterTarget);
69     }
70
71     private static void doIt(IProgressMonitor _monitor, ReadGraph graph, final int allowedTimeInMs, final int clusterTarget) {
72         if(_monitor == null) _monitor = new NullProgressMonitor();
73         QueryControl qc = graph.getService(QueryControl.class);
74         ClusterControl cc = graph.getService(ClusterControl.class);
75         _monitor.beginTask("Collect clusters", IProgressMonitor.UNKNOWN);
76         cc.gc(graph, clusterTarget);
77         _monitor.beginTask("Collect queries", IProgressMonitor.UNKNOWN);
78         qc.gc(graph, allowedTimeInMs);
79     }
80     
81     /**
82      * @param monitor
83      * @param session
84      * @param sync
85      * @param errorCallback
86      */
87     /**
88      * @param monitor <code>null</code> if progress monitor not available
89      * @param session the session to GC
90      * @param sync <code>true</code> to block until gc is completed
91      * @param errorCallback callback for any errors occuring during the
92      *        operation or <code>null</code> to ignore errors
93      * @param allowedTimeInMs the time allowed for query collection in ms
94      * @param clusterTarget target for the maximum amount of memory in bytes to
95      *        be consumed by cluster caches after collection.
96      */
97     public static long gc(IProgressMonitor monitor, Session session, boolean sync,
98             final Consumer<DatabaseException> errorCallback, final int allowedTimeInMs, final int clusterTarget) {
99         if (monitor == null)
100             monitor = new NullProgressMonitor();
101         final IProgressMonitor _monitor = monitor;
102         if (session == null)
103             throw new NullPointerException("null session");
104
105         final DataContainer<Long> took = new DataContainer<Long>(0L);
106         
107         WriteRequest request = new WriteRequest() {
108             @Override
109             public void perform(WriteGraph graph) throws DatabaseException {
110                 long start = System.nanoTime();
111                 doIt(_monitor, graph, allowedTimeInMs, clusterTarget);
112                 long duration = System.nanoTime()-start;
113                 took.set((long)(duration*1e-6));
114             }
115         };
116         
117         LifecycleSupport lfs = session.peekService(LifecycleSupport.class);
118         if (lfs == null || lfs.isClosed() || lfs.isClosing())
119             return 0L;
120         
121         if (sync) {
122             try {
123                 session.syncRequest(request);
124             } catch (DatabaseException e) {
125                 if (errorCallback != null)
126                     errorCallback.accept(e);
127                 else
128                     Logger.defaultLogError(e);
129             }
130         } else {
131             session.asyncRequest(request, new Callback<DatabaseException>() {
132                 @Override
133                 public void run(DatabaseException e) {
134                     if (e != null) {
135                         if (errorCallback != null)
136                             errorCallback.accept(e);
137                         else
138                             Logger.defaultLogError(e);
139                     }
140                 }
141             });
142         }
143         
144         return took.get();
145         
146     }
147
148 }