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.BarrierTracing;
20 import org.simantics.db.impl.graph.ReadGraphImpl;
21 import org.simantics.db.impl.query.QueryProcessor.SessionTask;
22 import org.simantics.db.procedure.AsyncProcedure;
23 import org.simantics.db.request.AsyncRead;
24 import org.slf4j.Logger;
25 import org.slf4j.LoggerFactory;
27 final public class AsyncReadEntry<T> extends CacheEntryBase<AsyncProcedure<T>> implements AsyncProcedure<T> {
29 private static final Logger LOGGER = LoggerFactory.getLogger(AsyncReadEntry.class);
31 protected AsyncRead<T> request;
33 AsyncReadEntry(AsyncRead<T> request) {
34 this.request = request;
35 if (DebugPolicy.QUERY_STATE)
36 System.out.println("[QUERY STATE]: created " + this);
41 return request.hashCode();
45 public Object getOriginalRequest() {
50 public void discard() {
55 public void except(AsyncReadGraph graph, Throwable t) {
66 final public Query getQuery() {
71 public void recompute(ReadGraphImpl graph) {
75 BlockingAsyncProcedure<T> proc = new BlockingAsyncProcedure<>(graph.asyncBarrier, graph, new AsyncProcedure<T>() {
78 public void execute(AsyncReadGraph graph, T result) {
84 public void exception(AsyncReadGraph graph, Throwable t) {
90 request.perform(graph, proc);
94 } catch (Throwable t) {
101 public void removeEntry(QueryProcessor qp) {
102 qp.cache.remove(AsyncReadEntry.this);
107 return request.getFlags();
111 public String toString() {
114 else if (isExcepted())
115 return request.toString() + " " + getResult();
117 return request.toString() + " " + statusOrException;
125 public Object performFromCache(ReadGraphImpl graph, AsyncProcedure<T> proc) {
130 proc.exception(graph, (Throwable) getResult());
131 } catch (Throwable t) {
132 LOGGER.error("performFromCache proc.exception failed", t);
138 T result = (T) getResult();
139 proc.execute(graph, result);
140 } catch (Throwable t) {
141 LOGGER.error("performFromCache proc.execute failed", t);
150 public static <T> T computeForEach(ReadGraphImpl graph, AsyncRead<T> request, AsyncReadEntry<T> entry,
151 AsyncProcedure<T> procedure_, boolean needsToBlock) throws DatabaseException {
153 AsyncProcedure<T> procedure = entry != null ? entry : procedure_;
155 ReadGraphImpl queryGraph = graph.withParent(entry);
156 queryGraph.asyncBarrier.inc();
158 BlockingAsyncProcedure<T> proc = new BlockingAsyncProcedure<>(queryGraph.asyncBarrier, graph, null, request);
160 class AsyncTask extends SessionTask {
164 DatabaseException exception;
166 public AsyncTask(ReadGraphImpl graph) {
171 public void run0(int thread) {
172 if(needsToBlock) proc.waitBarrier();
174 ReadGraphImpl executeGraph = graph.withParent(graph.parent);
175 executeGraph.asyncBarrier.inc();
177 result = (T)proc.get();
178 if(procedure != null) {
179 procedure.execute(executeGraph, result);
181 } catch (DatabaseException e) {
182 if(procedure != null) procedure.exception(executeGraph, e);
184 } catch (Throwable t) {
185 DatabaseException dbe = new DatabaseException(t);
186 if(procedure != null) procedure.exception(executeGraph, dbe);
190 // This does not throw
191 entry.performFromCache(executeGraph, procedure_);
193 executeGraph.asyncBarrier.dec();
194 executeGraph.asyncBarrier.waitBarrier(procedure, executeGraph);
197 if(counter++ > 10000) {
198 if(BarrierTracing.BOOKKEEPING) {
199 AsyncBarrierImpl.printReverse(queryGraph.asyncBarrier, 2);
200 AsyncBarrierImpl caller = queryGraph.asyncBarrier.caller;
201 while(caller != null) {
202 System.err.println("called by " + AsyncBarrierImpl.report(caller));
203 caller = caller.caller;
205 for(AsyncBarrierImpl ab : BarrierTracing.debuggerMap.keySet()) {
206 AsyncBarrierImpl.printReverse(ab, 2);
209 throw new IllegalStateException("Eternal loop in queries.");
211 graph.processor.schedule(new AsyncTask(graph));
218 request.perform(queryGraph, proc);
220 queryGraph.asyncBarrier.dec();
223 AsyncTask task = new AsyncTask(graph);
225 if(needsToBlock) task.run(0);
226 else if (proc.isDone()) task.run(0);
228 graph.processor.schedule(task);
232 if(task.exception != null) throw task.exception;
233 else return task.result;
238 public String toString() {
240 return "DISCARDED " + request.toString();
241 else if (isExcepted())
242 return request.toString() + " " + getResult();
244 return request.toString() + " " + statusOrException;
248 public void execute(AsyncReadGraph graph, T result) {
254 public void exception(AsyncReadGraph graph, Throwable throwable) {