001/* ***** BEGIN LICENSE BLOCK *****
002 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
003 *
004 * The contents of this file are subject to the Mozilla Public License Version
005 * 1.1 (the "License"); you may not use this file except in compliance with
006 * the License. You may obtain a copy of the License at
007 * http://www.mozilla.org/MPL/
008 *
009 * Software distributed under the License is distributed on an "AS IS" basis,
010 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
011 * for the specific language governing rights and limitations under the
012 * License.
013 *
014 * The Original Code is part of dcm4che, an implementation of DICOM(TM) in
015 * Java(TM), hosted at https://github.com/gunterze/dcm4che.
016 *
017 * The Initial Developer of the Original Code is
018 * Agfa Healthcare.
019 * Portions created by the Initial Developer are Copyright (C) 2011
020 * the Initial Developer. All Rights Reserved.
021 *
022 * Contributor(s):
023 * See @authors listed below
024 *
025 * Alternatively, the contents of this file may be used under the terms of
026 * either the GNU General Public License Version 2 or later (the "GPL"), or
027 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
028 * in which case the provisions of the GPL or the LGPL are applicable instead
029 * of those above. If you wish to allow use of your version of this file only
030 * under the terms of either the GPL or the LGPL, and not to allow others to
031 * use your version of this file under the terms of the MPL, indicate your
032 * decision by deleting the provisions above and replace them with the notice
033 * and other provisions required by the GPL or the LGPL. If you do not delete
034 * the provisions above, a recipient may use your version of this file under
035 * the terms of any one of the MPL, the GPL or the LGPL.
036 *
037 * ***** END LICENSE BLOCK ***** */
038
039package org.dcm4che3.net;
040
041import java.io.IOException;
042
043import org.dcm4che3.data.Tag;
044import org.dcm4che3.data.Attributes;
045
046/**
047 * @author Gunter Zeilinger <gunterze@gmail.com>
048 *
049 */
050public class FutureDimseRSP extends DimseRSPHandler implements DimseRSP {
051
052    private static class Entry {
053        final Attributes command;
054        final Attributes dataset;
055        Entry next;
056
057        public Entry(Attributes command, Attributes dataset) {
058            this.command = command;
059            this.dataset = dataset;
060        }
061    }
062
063    private Entry entry = new Entry(null, null);
064    private boolean finished;
065    private int autoCancel;
066    private IOException ex;
067
068    public FutureDimseRSP(int msgID) {
069        super(msgID);
070    }
071
072    @Override
073    public synchronized void onDimseRSP(Association as, Attributes cmd,
074            Attributes data) {
075        super.onDimseRSP(as, cmd, data);
076        Entry last = entry;
077        while (last.next != null)
078            last = last.next;
079
080        last.next = new Entry(cmd, data);
081        if (Status.isPending(cmd.getInt(Tag.Status, 0))) {
082            if (autoCancel > 0 && --autoCancel == 0)
083                try {
084                    super.cancel(as);
085                } catch (IOException e) {
086                    ex = e;
087                }
088        } else {
089            finished = true;
090        }
091        notifyAll();
092    }
093
094    @Override
095    public synchronized void onClose(Association as) {
096        super.onClose(as);
097        if (!finished) {
098            ex = as.getException();
099            if (ex == null)
100                ex = new IOException("Association to " + as.getRemoteAET()
101                            + " released before receive of outstanding DIMSE RSP");
102            notifyAll();
103        }
104    }
105
106    public final void setAutoCancel(int autoCancel) {
107        this.autoCancel = autoCancel;
108    }
109
110    @Override
111    public void cancel(Association a) throws IOException {
112        if (ex != null)
113            throw ex;
114        if (!finished)
115            super.cancel(a);
116    }
117
118    public final Attributes getCommand() {
119        return entry.command;
120    }
121
122    public final Attributes getDataset() {
123        return entry.dataset;
124    }
125
126    public synchronized boolean next() throws IOException, InterruptedException {
127        if (entry.next == null) {
128            if (finished)
129                return false;
130
131            while (entry.next == null && ex == null)
132                wait();
133
134            if (ex != null)
135                throw ex;
136        }
137        entry = entry.next;
138        return true;
139    }
140}