1 /*******************************************************************************
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2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
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3 * in Industry THTH ry.
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4 * All rights reserved. This program and the accompanying materials
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5 * are made available under the terms of the Eclipse Public License v1.0
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6 * which accompanies this distribution, and is available at
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7 * http://www.eclipse.org/legal/epl-v10.html
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10 * VTT Technical Research Centre of Finland - initial API and implementation
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11 *******************************************************************************/
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12 package org.simantics.db.common.processor;
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14 import java.util.concurrent.ConcurrentLinkedQueue;
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16 import org.simantics.db.AsyncRequestProcessor;
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17 import org.simantics.db.WriteGraph;
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18 import org.simantics.db.common.request.DelayedWriteRequest;
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19 import org.simantics.db.common.utils.Logger;
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20 import org.simantics.db.exception.DatabaseException;
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21 import org.simantics.db.request.DelayedWrite;
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23 final public class MergingDelayedWriteProcessor extends ProcessorBase {
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25 final long transactionKeepalivePeriod;
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26 final ConcurrentLinkedQueue<DelayedWrite> queue = new ConcurrentLinkedQueue<DelayedWrite>();
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27 final private AsyncRequestProcessor processor;
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29 boolean hasAlreadyRequest = false;
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31 public MergingDelayedWriteProcessor(AsyncRequestProcessor processor, long transactionKeepalivePeriod) {
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32 this.processor = processor;
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33 this.transactionKeepalivePeriod = transactionKeepalivePeriod;
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36 class MergedWrite extends DelayedWriteRequest {
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39 public void perform(WriteGraph graph) throws DatabaseException {
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41 // System.out.println("MergedWrite begins");
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45 DelayedWrite next = queue.poll();
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47 synchronized (MergingDelayedWriteProcessor.this) {
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48 if (transactionKeepalivePeriod > 0) {
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50 MergingDelayedWriteProcessor.this.wait(transactionKeepalivePeriod);
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51 } catch (InterruptedException e) {
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52 Logger.defaultLogError(e);
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54 next = queue.poll();
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57 hasAlreadyRequest = false;
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58 // System.out.println("MergedWrite ends");
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64 // System.out.println("MergedWrite executes " + next);
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66 next.perform(graph);
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67 } catch(Throwable t) {
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68 Logger.defaultLogError(t);
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78 public void asyncRequest(DelayedWrite request) {
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82 synchronized (this) {
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84 if (!hasAlreadyRequest) {
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85 processor.asyncRequest(new MergedWrite());
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86 hasAlreadyRequest = true;
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96 public String toString() {
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97 return "MergingDelayedWriteProcessor@" + System.identityHashCode(this) + " (based on " + processor + ")";
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