1 /*******************************************************************************
2 * Copyright (c) 2007, 2018 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 org.simantics.db.AsyncReadGraph;
15 import org.simantics.db.exception.DatabaseException;
16 import org.simantics.db.impl.graph.ReadGraphImpl;
17 import org.simantics.db.procedure.AsyncProcedure;
18 import org.simantics.db.request.Read;
19 import org.simantics.db.request.ReadExt;
20 import org.simantics.db.request.RequestFlags;
21 import org.slf4j.Logger;
22 import org.slf4j.LoggerFactory;
24 public final class ReadEntry<T> extends CacheEntryBase<AsyncProcedure<T>> implements AsyncProcedure<T> {
26 private static final Logger LOGGER = LoggerFactory.getLogger(ReadEntry.class);
28 protected Read<T> request;
30 public ReadEntry(Read<T> request) {
31 this.request = request;
36 return request.hashCode();
40 public Object getOriginalRequest() {
45 public void discard() {
51 final public Query getQuery() {
56 public void recompute(ReadGraphImpl graph) {
60 T result = request.perform(graph);
64 } catch (Throwable t) {
73 public void removeEntry(QueryProcessor processor) {
74 processor.cache.remove(ReadEntry.this);
79 if (request instanceof ReadExt) {
80 return ((ReadExt) request).getType();
82 return RequestFlags.INVALIDATE;
87 public String toString() {
91 return request.toString() + statusOrException;
98 public static <T> T computeForEach(ReadGraphImpl graph, Read<T> request, ReadEntry<T> entry,
99 AsyncProcedure<T> procedure_) throws DatabaseException {
101 AsyncProcedure<T> procedure = entry != null ? entry : procedure_;
103 ReadGraphImpl queryGraph = graph.withParent(entry);
104 queryGraph.asyncBarrier.inc();
106 ReadGraphImpl executeGraph = graph.withParent(graph.parent);
107 executeGraph.asyncBarrier.inc();
112 T result = request.perform(queryGraph);
114 if(procedure != null) procedure.execute(executeGraph, result);
117 } catch (DatabaseException e) {
119 if(procedure != null) procedure.exception(executeGraph, e);
122 } catch (Throwable t) {
124 DatabaseException dbe = new DatabaseException(t);
125 if(procedure != null) procedure.exception(executeGraph, dbe);
130 queryGraph.asyncBarrier.dec();
135 // This also throws so must dec barrier finally
136 entry.performFromCache(executeGraph, procedure_);
141 executeGraph.asyncBarrier.dec();
142 executeGraph.asyncBarrier.waitBarrier(procedure, executeGraph);
151 public Object performFromCache(ReadGraphImpl graph, AsyncProcedure<T> procedure) throws DatabaseException {
153 AsyncProcedure<T> proc = (AsyncProcedure<T>) procedure;
158 proc.exception(graph, (Throwable) getResult());
159 } catch (Throwable t) {
160 LOGGER.error("performFromCache proc.exception failed", t);
163 Throwable t = (Throwable) getResult();
164 if(t instanceof DatabaseException) {
165 throw (DatabaseException)t;
167 throw new DatabaseException(t);
172 proc.execute(graph, (T) getResult());
173 } catch (Throwable t) {
174 LOGGER.error("performFromCache proc.execute failed", t);
177 return (T)getResult();
183 public String toString() {
187 return request.toString() + " - " + statusOrException;
190 public Object get(ReadGraphImpl graph, AsyncProcedure<T> procedure) throws DatabaseException {
191 if (procedure != null)
192 performFromCache(graph, procedure);
198 boolean isImmutable(ReadGraphImpl graph) throws DatabaseException {
199 if (request instanceof ReadExt) {
200 return ((ReadExt) request).isImmutable(graph);
206 public void execute(AsyncReadGraph graph, T result) {
212 public void exception(AsyncReadGraph graph, Throwable throwable) {