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 org.simantics.db.AsyncRequestProcessor;
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15 import org.simantics.db.RequestProcessor;
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16 import org.simantics.db.VirtualGraph;
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17 import org.simantics.db.exception.DatabaseException;
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18 import org.simantics.db.procedure.Procedure;
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19 import org.simantics.db.request.UndoTraits;
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20 import org.simantics.db.request.WriteInterface;
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21 import org.simantics.db.request.WriteOnly;
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22 import org.simantics.utils.datastructures.Callback;
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26 * TODO: fix this javadoc to document the correct class!!
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31 * Synchronous read without checked exceptions:
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34 * Resource r = new SimpleReadGraphRequest<Resource>(session) {
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36 * public Resource run(Graph g) {
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37 * Resource r = doSomethingThatMayFail();
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44 * Synchronous read with a selected checked exception that may be thrown:
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47 * Resource r = new SimpleReadGraphRequest<Resource>(session) {
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49 * public Resource run(Graph g) throws CheckedException {
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50 * Resource r = doSomethingThatMayFailWithCheckedException();
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53 * }.sync(CheckedException.class);
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57 * Asynchronous read with a completed() method for examining the result:
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60 * Resource r = new SimpleReadGraphRequest<Resource>(session) {
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62 * public Resource run(Graph g) {
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63 * Resource r = doSomethingThatMayFail();
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66 * public void completed(Resource result) {
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67 * // quickly dispatch the result somewhere, do nothing serious in this code.
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72 * @param <T> the result type
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74 public abstract class WriteOnlyRequest implements WriteOnly, WriteInterface<Object> {
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76 private final VirtualGraph provider;
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78 public WriteOnlyRequest() {
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79 this.provider = null;
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82 public WriteOnlyRequest(VirtualGraph provider) {
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83 this.provider = provider;
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87 final public VirtualGraph getProvider() {
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92 public UndoTraits getUndoTraits() {
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97 public void request(AsyncRequestProcessor processor, final Procedure<Object> procedure) {
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98 processor.asyncRequest(this, new Callback<DatabaseException>() {
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101 public void run(DatabaseException parameter) {
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102 if(parameter != null) procedure.exception(parameter);
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103 else procedure.execute(null);
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110 public Object request(RequestProcessor processor) throws DatabaseException {
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111 processor.syncRequest(this);
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