/*******************************************************************************
- * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * Copyright (c) 2007, 2018 Association for Decentralized Information Management
* in Industry THTH ry.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
package org.simantics.db.impl.query;
import org.simantics.db.AsyncReadGraph;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.impl.BlockingAsyncProcedure;
import org.simantics.db.impl.DebugPolicy;
+import org.simantics.db.impl.graph.AsyncBarrierImpl;
+import org.simantics.db.impl.graph.BarrierTracing;
import org.simantics.db.impl.graph.ReadGraphImpl;
+import org.simantics.db.impl.query.QueryProcessor.SessionTask;
import org.simantics.db.procedure.AsyncProcedure;
import org.simantics.db.request.AsyncRead;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
-final public class AsyncReadEntry<T> extends CacheEntryBase {
+final public class AsyncReadEntry<T> extends CacheEntryBase<AsyncProcedure<T>> implements AsyncProcedure<T> {
+
+ private static final Logger LOGGER = LoggerFactory.getLogger(AsyncReadEntry.class);
protected AsyncRead<T> request;
- public AsyncReadEntry(AsyncRead<T> request) {
- this.request = request;
- if(DebugPolicy.QUERY_STATE) System.out.println("[QUERY STATE]: created " + this);
+ AsyncReadEntry(AsyncRead<T> request) {
+ this.request = request;
+ if (DebugPolicy.QUERY_STATE)
+ System.out.println("[QUERY STATE]: created " + this);
}
@Override
int makeHash() {
- return request.hashCode();
+ return request.hashCode();
}
-
+
@Override
public Object getOriginalRequest() {
return request;
}
-
+
@Override
public void discard() {
- super.discard();
- //request = null;
- setResult(null);
+ super.discard();
+ setResult(null);
}
-
- final public void addOrSet(AsyncReadGraph graph, Object item) {
-
- assert(isPending());
-
-// ArrayList<AsyncProcedure<T>> p = null;
-
- synchronized(this) {
-
- setResult(item);
- setReady();
-// p = procs;
-// procs = null;
-
- }
-// if(p != null)
-// for(AsyncProcedure<T> proc : p) {
-// proc.execute(graph, (T)item);
-//// proc.first.execute(graph, (T)item);
-//// proc.second.dec();
-// }
-
- }
-
-
public void except(AsyncReadGraph graph, Throwable t) {
-
- assert(isPending());
-
-// ArrayList<AsyncProcedure<T>> p = null;
- synchronized(this) {
-
+ assert (isPending());
+
+ synchronized (this) {
except(t);
-//// p = procs;
-// procs = null;
-
}
-// if(p != null)
-// for(AsyncProcedure<T> proc : p) {
-// proc.exception(graph, t);
-// }
-
}
-
-
+
@Override
final public Query getQuery() {
-
- return new Query() {
- @Override
- public void recompute(ReadGraphImpl graph, Object provider, CacheEntry entry) {
-
- QueryProcessor qp = (QueryProcessor)provider;
+ return new Query() {
- final ReadGraphImpl parentGraph = ReadGraphImpl.forRecompute(entry, qp);
+ @Override
+ public void recompute(ReadGraphImpl graph) {
- try {
+ try {
- request.perform(parentGraph , new AsyncProcedure<T>() {
+ BlockingAsyncProcedure<T> proc = new BlockingAsyncProcedure<>(graph.asyncBarrier, graph, new AsyncProcedure<T>() {
@Override
public void execute(AsyncReadGraph graph, T result) {
- addOrSet(graph, result);
+ setResult(result);
+ setReady();
}
-
- @Override
- public void exception(AsyncReadGraph graph, Throwable t) {
- except(t);
+
+ @Override
+ public void exception(AsyncReadGraph graph, Throwable t) {
+ except(t);
}
- });
+ }, request);
+
+ request.perform(graph, proc);
+
+ proc.get();
- } catch (Throwable t) {
- except(t);
+ } catch (Throwable t) {
+ except(t);
}
-
- }
-
- @Override
- public void removeEntry(QueryProcessor qp) {
- qp.asyncReadMap.remove(request);
- }
-
- @Override
- public int type() {
- return request.getFlags();
- }
-
- @Override
- public String toString() {
- if(request == null) return "DISCARDED";
- else if(isExcepted()) return request.toString() + " " + getResult();
- else return request.toString() + " " + statusOrException;
- }
-
+
+ }
+
+ @Override
+ public void removeEntry(QueryProcessor qp) {
+ qp.cache.remove(AsyncReadEntry.this);
+ }
+
+ @Override
+ public int type() {
+ return request.getFlags();
+ }
+
+ @Override
+ public String toString() {
+ if (request == null)
+ return "DISCARDED";
+ else if (isExcepted())
+ return request.toString() + " " + getResult();
+ else
+ return request.toString() + " " + statusOrException;
+ }
+
};
-
+
}
- @SuppressWarnings("unchecked")
- public void performFromCache(ReadGraphImpl graph, Object provider, Object procedure) {
-
- AsyncProcedure<T> proc = (AsyncProcedure<T>)procedure;
+ @Override
+ public Object performFromCache(ReadGraphImpl graph, AsyncProcedure<T> proc) {
+
+ if (isExcepted()) {
- if(isExcepted()) {
-
try {
- proc.exception(graph, (Throwable)getResult());
+ proc.exception(graph, (Throwable) getResult());
} catch (Throwable t) {
- t.printStackTrace();
+ LOGGER.error("performFromCache proc.exception failed", t);
}
-
+
} else {
-
+
try {
- proc.execute(graph, (T)getResult());
+ T result = (T) getResult();
+ proc.execute(graph, result);
} catch (Throwable t) {
- t.printStackTrace();
+ LOGGER.error("performFromCache proc.execute failed", t);
+ }
+
+ }
+
+ return getResult();
+
+ }
+
+ public static <T> T computeForEach(ReadGraphImpl graph, AsyncRead<T> request, AsyncReadEntry<T> entry,
+ AsyncProcedure<T> procedure_, boolean needsToBlock) throws DatabaseException {
+
+ AsyncProcedure<T> procedure = entry != null ? entry : procedure_;
+
+ ReadGraphImpl queryGraph = graph.withParent(entry);
+ queryGraph.asyncBarrier.inc();
+
+ BlockingAsyncProcedure<T> proc = new BlockingAsyncProcedure<>(queryGraph.asyncBarrier, graph, null, request);
+
+ class AsyncTask extends SessionTask {
+
+ int counter = 0;
+ T result;
+ DatabaseException exception;
+
+ public AsyncTask(ReadGraphImpl graph) {
+ super(graph);
+ }
+
+ @Override
+ public void run0(int thread) {
+ if(needsToBlock) proc.waitBarrier();
+ if(proc.isDone()) {
+ ReadGraphImpl executeGraph = graph.withParent(graph.parent);
+ executeGraph.asyncBarrier.inc();
+ try {
+ result = (T)proc.get();
+ if(procedure != null) {
+ procedure.execute(executeGraph, result);
+ }
+ } catch (DatabaseException e) {
+ if(procedure != null) procedure.exception(executeGraph, e);
+ exception = e;
+ } catch (Throwable t) {
+ DatabaseException dbe = new DatabaseException(t);
+ if(procedure != null) procedure.exception(executeGraph, dbe);
+ exception = dbe;
+ } finally {
+ if (entry != null) {
+ // This does not throw
+ entry.performFromCache(executeGraph, procedure_);
+ }
+ executeGraph.asyncBarrier.dec();
+ executeGraph.asyncBarrier.waitBarrier(procedure, executeGraph);
+ }
+ } else {
+ if(counter++ > 10000) {
+ if(BarrierTracing.BOOKKEEPING) {
+ AsyncBarrierImpl.printReverse(queryGraph.asyncBarrier, 2);
+ AsyncBarrierImpl caller = queryGraph.asyncBarrier.caller;
+ while(caller != null) {
+ System.err.println("called by " + AsyncBarrierImpl.report(caller));
+ caller = caller.caller;
+ }
+ for(AsyncBarrierImpl ab : BarrierTracing.debuggerMap.keySet()) {
+ AsyncBarrierImpl.printReverse(ab, 2);
+ }
+ }
+ throw new IllegalStateException("Eternal loop in queries.");
+ }
+ graph.processor.schedule(new AsyncTask(graph));
+ }
}
}
-
- }
-
- @Override
- public String toString() {
- if(isDiscarded()) return "DISCARDED " + request.toString();
- else if(isExcepted()) return request.toString() + " " + getResult();
- else return request.toString() + " " + statusOrException;
- }
+
+ try {
+ request.perform(queryGraph, proc);
+ } finally {
+ queryGraph.asyncBarrier.dec();
+ }
+
+ AsyncTask task = new AsyncTask(graph);
+
+ if(needsToBlock) task.run(0);
+ else if (proc.isDone()) task.run(0);
+ else {
+ graph.processor.schedule(task);
+ return null;
+ }
+
+ if(task.exception != null) throw task.exception;
+ else return task.result;
+
+ }
+
+ @Override
+ public String toString() {
+ if (isDiscarded())
+ return "DISCARDED " + request.toString();
+ else if (isExcepted())
+ return request.toString() + " " + getResult();
+ else
+ return request.toString() + " " + statusOrException;
+ }
+
+ @Override
+ public void execute(AsyncReadGraph graph, T result) {
+ setResult(result);
+ setReady();
+ }
+
+ @Override
+ public void exception(AsyncReadGraph graph, Throwable throwable) {
+ except(throwable);
+ }
}