1 /*******************************************************************************
2 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License v1.0
6 * which accompanies this distribution, and is available at
7 * http://www.eclipse.org/legal/epl-v10.html
10 * VTT Technical Research Centre of Finland - initial API and implementation
11 *******************************************************************************/
12 package org.simantics.db.impl.query;
14 import java.util.ArrayList;
16 import org.simantics.db.AsyncReadGraph;
17 import org.simantics.db.exception.DatabaseException;
18 import org.simantics.db.impl.graph.ReadGraphImpl;
19 import org.simantics.db.procedure.AsyncMultiProcedure;
20 import org.simantics.db.request.AsyncMultiRead;
21 import org.simantics.db.request.RequestFlags;
23 final public class AsyncMultiReadEntry<T> extends CacheEntryBase<AsyncMultiProcedure<T>> {
25 protected AsyncMultiRead<T> request;
27 AsyncMultiReadEntry(AsyncMultiRead<T> request) {
28 this.request = request;
33 return request.hashCode();
37 public Object getOriginalRequest() {
42 public void discard() {
48 final synchronized public void finish(AsyncReadGraph graph) {
58 final synchronized public void except(AsyncReadGraph graph, Throwable t) {
68 @SuppressWarnings("unchecked")
69 final synchronized public void addOrSet(Object item) {
73 ArrayList<T> value = (ArrayList<T>)getResult();
79 public void clearResult(QuerySupport support) {
80 setResult(new ArrayList<T>());
84 final public Query getQuery() {
89 public void recompute(ReadGraphImpl graph) {
93 GraphSemaphore s = new GraphSemaphore(graph, 0);
95 request.perform(graph , new AsyncMultiProcedure<T>() {
98 public void execute(AsyncReadGraph graph, T result) {
102 public void finished(AsyncReadGraph graph) {
108 public void exception(AsyncReadGraph graph, Throwable t) {
117 } catch (Throwable t) {
126 public void removeEntry(QueryProcessor processor) {
127 processor.cache.remove(AsyncMultiReadEntry.this);
132 return RequestFlags.INVALIDATE;
136 public String toString() {
137 if(request == null) return "DISCARDED";
138 else return request.toString() + statusOrException;
145 @SuppressWarnings("unchecked")
147 public Object performFromCache(ReadGraphImpl graph, AsyncMultiProcedure<T> proc) {
152 proc.exception(graph, (Throwable)getResult());
153 } catch (Throwable t) {
160 final ArrayList<T> values = (ArrayList<T>)getResult();
161 for(T value : values) {
163 proc.execute(graph, value);
164 } catch (Throwable t) {
170 proc.finished(graph);
171 } catch (Throwable t) {
182 public String toString() {
183 if(request == null) return "DISCARDED";
184 else return request.toString() + statusOrException;
188 public Object compute(ReadGraphImpl graph, AsyncMultiProcedure<T> procedure) throws DatabaseException {
189 return graph.processor.cache.performQuery(graph, request, this, procedure);