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.VirtualGraph;
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18 import org.simantics.db.WriteOnlyGraph;
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19 import org.simantics.db.common.request.WriteOnlyRequest;
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20 import org.simantics.db.common.utils.Logger;
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21 import org.simantics.db.exception.DatabaseException;
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22 import org.simantics.db.request.WriteOnly;
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24 final public class MergingWriteOnlyProcessor extends ProcessorBase {
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26 final long transactionKeepalivePeriod;
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27 final ConcurrentLinkedQueue<WriteOnly> queue = new ConcurrentLinkedQueue<WriteOnly>();
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28 final private AsyncRequestProcessor processor;
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29 final private VirtualGraph vg;
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31 boolean hasAlreadyRequest = false;
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33 public MergingWriteOnlyProcessor(AsyncRequestProcessor processor, VirtualGraph vg, long transactionKeepalivePeriod) {
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34 this.processor = processor;
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36 this.transactionKeepalivePeriod = transactionKeepalivePeriod;
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39 class MergedWrite extends WriteOnlyRequest {
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41 public MergedWrite(VirtualGraph vg) {
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46 public void perform(WriteOnlyGraph graph) throws DatabaseException {
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48 // System.out.println("MergedWrite begins");
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52 WriteOnly next = queue.poll();
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54 synchronized (MergingWriteOnlyProcessor.this) {
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55 if (transactionKeepalivePeriod > 0) {
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57 MergingWriteOnlyProcessor.this.wait(transactionKeepalivePeriod);
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58 } catch (InterruptedException e) {
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59 Logger.defaultLogError(e);
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61 next = queue.poll();
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64 hasAlreadyRequest = false;
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65 // System.out.println("MergedWrite ends");
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71 // System.out.println("MergedWrite executes " + next);
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73 next.perform(graph);
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74 } catch(Throwable t) {
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75 Logger.defaultLogError(t);
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85 public void asyncRequest(WriteOnly request) {
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89 synchronized (this) {
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91 if (!hasAlreadyRequest) {
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92 processor.asyncRequest(new MergedWrite(vg));
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93 hasAlreadyRequest = true;
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103 public String toString() {
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104 return "MergingWriteOnlyProcessor@" + System.identityHashCode(this) + " (based on " + processor + ")";
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