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.request;
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14 import java.util.Map;
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16 import org.simantics.db.AsyncRequestProcessor;
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17 import org.simantics.db.ChangeSetIdentifier;
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18 import org.simantics.db.Operation;
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19 import org.simantics.db.RequestProcessor;
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20 import org.simantics.db.VirtualGraph;
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21 import org.simantics.db.exception.DatabaseException;
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22 import org.simantics.db.procedure.Procedure;
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23 import org.simantics.db.request.DelayedWrite;
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24 import org.simantics.db.request.UndoTraits;
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25 import org.simantics.db.request.WriteInterface;
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26 import org.simantics.utils.datastructures.Callback;
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33 * Synchronous read without checked exceptions:
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36 * Resource r = new SimpleReadGraphRequest<Resource>(session) {
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38 * public Resource run(Graph g) {
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39 * Resource r = doSomethingThatMayFail();
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46 * Synchronous read with a selected checked exception that may be thrown:
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49 * Resource r = new SimpleReadGraphRequest<Resource>(session) {
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51 * public Resource run(Graph g) throws CheckedException {
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52 * Resource r = doSomethingThatMayFailWithCheckedException();
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55 * }.sync(CheckedException.class);
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59 * Asynchronous read with a completed() method for examining the result:
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62 * Resource r = new SimpleReadGraphRequest<Resource>(session) {
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64 * public Resource run(Graph g) {
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65 * Resource r = doSomethingThatMayFail();
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68 * public void completed(Resource result) {
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69 * // quickly dispatch the result somewhere, do nothing serious in this code.
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74 * @param <T> the result type
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76 public abstract class DelayedWriteRequest implements DelayedWrite, UndoTraits, WriteInterface<Object> {
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79 public VirtualGraph getProvider() {
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84 public UndoTraits getUndoTraits() {
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89 public ChangeSetIdentifier getIdentifier() {
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94 public void fillMetadata(Map<String, String> metadata) {
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95 metadata.put("class=", this.getClass().getName());
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99 public void commitOk(Operation op) {
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103 public void request(AsyncRequestProcessor processor, final Procedure<Object> procedure) {
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104 processor.asyncRequest(this, new Callback<DatabaseException>() {
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107 public void run(DatabaseException parameter) {
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108 if(parameter != null) procedure.exception(parameter);
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109 else procedure.execute(null);
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116 public Object request(RequestProcessor processor) throws DatabaseException {
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117 processor.syncRequest(this);
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