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RESTful service to List Diff Tasks : for large result lists avoid Out…
…OfMemoryError #1333
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dcm4chee-arc-diff/src/main/java/org/dcm4chee/arc/diff/impl/DiffTaskQueryImpl.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,113 @@ | ||
| /* | ||
| * **** BEGIN LICENSE BLOCK ***** | ||
| * Version: MPL 1.1/GPL 2.0/LGPL 2.1 | ||
| * | ||
| * The contents of this file are subject to the Mozilla Public License Version | ||
| * 1.1 (the "License"); you may not use this file except in compliance with | ||
| * the License. You may obtain a copy of the License at | ||
| * http://www.mozilla.org/MPL/ | ||
| * | ||
| * Software distributed under the License is distributed on an "AS IS" basis, | ||
| * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License | ||
| * for the specific language governing rights and limitations under the | ||
| * License. | ||
| * | ||
| * The Original Code is part of dcm4che, an implementation of DICOM(TM) in | ||
| * Java(TM), hosted at https://github.com/dcm4che. | ||
| * | ||
| * The Initial Developer of the Original Code is | ||
| * J4Care. | ||
| * Portions created by the Initial Developer are Copyright (C) 2015-2018 | ||
| * the Initial Developer. All Rights Reserved. | ||
| * | ||
| * Contributor(s): | ||
| * See @authors listed below | ||
| * | ||
| * Alternatively, the contents of this file may be used under the terms of | ||
| * either the GNU General Public License Version 2 or later (the "GPL"), or | ||
| * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"), | ||
| * in which case the provisions of the GPL or the LGPL are applicable instead | ||
| * of those above. If you wish to allow use of your version of this file only | ||
| * under the terms of either the GPL or the LGPL, and not to allow others to | ||
| * use your version of this file under the terms of the MPL, indicate your | ||
| * decision by deleting the provisions above and replace them with the notice | ||
| * and other provisions required by the GPL or the LGPL. If you do not delete | ||
| * the provisions above, a recipient may use your version of this file under | ||
| * the terms of any one of the MPL, the GPL or the LGPL. | ||
| * | ||
| * **** END LICENSE BLOCK ***** | ||
| * | ||
| */ | ||
|
|
||
| package org.dcm4chee.arc.diff.impl; | ||
|
|
||
| import com.mysema.commons.lang.CloseableIterator; | ||
| import com.querydsl.core.types.OrderSpecifier; | ||
| import com.querydsl.core.types.Predicate; | ||
| import com.querydsl.jpa.hibernate.HibernateQuery; | ||
| import org.dcm4che3.util.SafeClose; | ||
| import org.dcm4chee.arc.diff.DiffTaskQuery; | ||
| import org.dcm4chee.arc.entity.*; | ||
| import org.hibernate.StatelessSession; | ||
| import org.hibernate.Transaction; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
|
|
||
| import java.util.Date; | ||
| import java.util.Iterator; | ||
|
|
||
| /** | ||
| * @author Vrinda Nayak <vrinda.nayak@j4care.com> | ||
| * @since Apr 2018 | ||
| */ | ||
| class DiffTaskQueryImpl implements DiffTaskQuery { | ||
| private static final Logger LOG = LoggerFactory.getLogger(DiffTaskQueryImpl.class); | ||
| private final StatelessSession session; | ||
| private final HibernateQuery<DiffTask> query; | ||
| private Transaction transaction; | ||
| private CloseableIterator<DiffTask> iterate; | ||
|
|
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| public DiffTaskQueryImpl(StatelessSession session, int fetchSize, | ||
| Predicate matchQueueMessage, | ||
| Predicate matchDiffTask, | ||
| OrderSpecifier<Date> order, | ||
| int offset, int limit) { | ||
| this.session = session; | ||
| HibernateQuery<QueueMessage> queueMsgQuery = new HibernateQuery<QueueMessage>(session) | ||
| .from(QQueueMessage.queueMessage) | ||
| .where(matchQueueMessage); | ||
|
|
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| query = new HibernateQuery<DiffTask>(session) | ||
| .from(QDiffTask.diffTask) | ||
| .leftJoin(QDiffTask.diffTask.queueMessage, QQueueMessage.queueMessage) | ||
| .where(matchDiffTask, QDiffTask.diffTask.queueMessage.in(queueMsgQuery)); | ||
| if (limit > 0) | ||
| query.limit(limit); | ||
| if (offset > 0) | ||
| query.offset(offset); | ||
| if (order != null) | ||
| query.orderBy(order); | ||
| query.setFetchSize(fetchSize); | ||
| } | ||
|
|
||
|
|
||
| @Override | ||
| public void close() { | ||
| SafeClose.close(iterate); | ||
| if (transaction != null) { | ||
| try { | ||
| transaction.commit(); | ||
| } catch (Exception e) { | ||
| LOG.warn("Failed to commit transaction:\n{}", e); | ||
| } | ||
| } | ||
| SafeClose.close(session); | ||
| } | ||
|
|
||
| @Override | ||
| public Iterator<DiffTask> iterator() { | ||
| transaction = session.beginTransaction(); | ||
| iterate = query.iterate(); | ||
| return iterate; | ||
| } | ||
| } |
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