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.BlockingAsyncProcedure;
17 import org.simantics.db.impl.DebugPolicy;
18 import org.simantics.db.impl.graph.AsyncBarrierImpl;
19 import org.simantics.db.impl.graph.ReadGraphImpl;
20 import org.simantics.db.impl.query.QueryProcessor.SessionTask;
21 import org.simantics.db.procedure.AsyncProcedure;
22 import org.simantics.db.request.AsyncRead;
23 import org.slf4j.Logger;
24 import org.slf4j.LoggerFactory;
26 final public class AsyncReadEntry<T> extends CacheEntryBase<AsyncProcedure<T>> implements AsyncProcedure<T> {
28 private static final Logger LOGGER = LoggerFactory.getLogger(AsyncReadEntry.class);
30 protected AsyncRead<T> request;
32 AsyncReadEntry(AsyncRead<T> request) {
33 this.request = request;
34 if (DebugPolicy.QUERY_STATE)
35 System.out.println("[QUERY STATE]: created " + this);
40 return request.hashCode();
44 public Object getOriginalRequest() {
49 public void discard() {
54 public void except(AsyncReadGraph graph, Throwable t) {
65 final public Query getQuery() {
70 public void recompute(ReadGraphImpl graph) {
74 BlockingAsyncProcedure<T> proc = new BlockingAsyncProcedure<>(graph.asyncBarrier, graph, new AsyncProcedure<T>() {
77 public void execute(AsyncReadGraph graph, T result) {
83 public void exception(AsyncReadGraph graph, Throwable t) {
89 request.perform(graph, proc);
93 } catch (Throwable t) {
100 public void removeEntry(QueryProcessor qp) {
101 qp.cache.remove(AsyncReadEntry.this);
106 return request.getFlags();
110 public String toString() {
113 else if (isExcepted())
114 return request.toString() + " " + getResult();
116 return request.toString() + " " + statusOrException;
124 public Object performFromCache(ReadGraphImpl graph, AsyncProcedure<T> proc) {
129 proc.exception(graph, (Throwable) getResult());
130 } catch (Throwable t) {
131 LOGGER.error("performFromCache proc.exception failed", t);
137 T result = (T) getResult();
138 proc.execute(graph, result);
139 } catch (Throwable t) {
140 LOGGER.error("performFromCache proc.execute failed", t);
149 public static <T> T computeForEach(ReadGraphImpl graph, AsyncRead<T> request, AsyncReadEntry<T> entry,
150 AsyncProcedure<T> procedure_, boolean needsToBlock) throws DatabaseException {
152 AsyncProcedure<T> procedure = entry != null ? entry : procedure_;
154 ReadGraphImpl queryGraph = graph.withParent(entry);
156 BlockingAsyncProcedure<T> proc = new BlockingAsyncProcedure<>(queryGraph.asyncBarrier, graph, null, request);
158 class AsyncTask extends SessionTask {
162 DatabaseException exception;
164 public AsyncTask(ReadGraphImpl graph) {
169 public void run(int thread) {
170 if(needsToBlock) proc.waitBarrier();
173 result = (T)proc.get();
174 if(procedure != null) procedure.execute(graph, result);
175 } catch (DatabaseException e) {
176 if(procedure != null) procedure.exception(graph, e);
178 } catch (Throwable t) {
179 DatabaseException dbe = new DatabaseException(t);
180 if(procedure != null) procedure.exception(graph, dbe);
184 entry.performFromCache(graph, procedure_);
187 if(counter++ > 10000) {
188 AsyncBarrierImpl.printReverse(queryGraph.asyncBarrier, 2);
189 AsyncBarrierImpl caller = queryGraph.asyncBarrier.caller;
190 while(caller != null) {
191 System.err.println("called by " + AsyncBarrierImpl.report(caller));
192 caller = caller.caller;
194 for(AsyncBarrierImpl ab : AsyncBarrierImpl.debuggerMap.keySet()) {
195 AsyncBarrierImpl.printReverse(ab, 2);
197 throw new IllegalStateException("Eternal loop in queries.");
199 graph.processor.schedule(this);
205 request.perform(queryGraph, proc);
207 AsyncTask task = new AsyncTask(graph);
209 if(needsToBlock) task.run(0);
210 else if (proc.isDone()) task.run(0);
212 graph.processor.schedule(task);
216 if(task.exception != null) throw task.exception;
217 else return task.result;
222 public String toString() {
224 return "DISCARDED " + request.toString();
225 else if (isExcepted())
226 return request.toString() + " " + getResult();
228 return request.toString() + " " + statusOrException;
232 public void execute(AsyncReadGraph graph, T result) {
238 public void exception(AsyncReadGraph graph, Throwable throwable) {