--- /dev/null
+/*******************************************************************************\r
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
+ * in Industry THTH ry.\r
+ * All rights reserved. This program and the accompanying materials\r
+ * are made available under the terms of the Eclipse Public License v1.0\r
+ * which accompanies this distribution, and is available at\r
+ * http://www.eclipse.org/legal/epl-v10.html\r
+ *\r
+ * Contributors:\r
+ * VTT Technical Research Centre of Finland - initial API and implementation\r
+ *******************************************************************************/\r
+package org.simantics.db.impl.query;\r
+\r
+import java.util.concurrent.Semaphore;\r
+\r
+import org.simantics.db.impl.graph.ReadGraphImpl;\r
+import org.simantics.db.impl.procedure.InternalProcedure;\r
+import org.simantics.db.procedure.ListenerBase;\r
+\r
+final public class ValueQuery extends UnaryQuery<InternalProcedure<byte[]>> {\r
+ \r
+ private ValueQuery(final int resource) {\r
+ super(resource);\r
+ }\r
+ \r
+ final static ValueQuery entry(final QueryProcessor provider, final int r) {\r
+ return (ValueQuery)provider.valueMap.get(r);\r
+ }\r
+\r
+ final static byte[] runner(final ReadGraphImpl graph, final int r, CacheEntry parent, final ListenerBase listener, final InternalProcedure<byte[]> procedure) {\r
+\r
+ QueryProcessor processor = graph.processor;\r
+ \r
+ ValueQuery entry = (ValueQuery)processor.valueMap.get(r); \r
+ if(entry == null) {\r
+ \r
+ entry = new ValueQuery(r);\r
+ entry.setPending();\r
+ entry.clearResult(processor.querySupport);\r
+ entry.putEntry(processor);\r
+ \r
+ return (byte[])processor.performForEach(graph, entry, parent, listener, procedure);\r
+ \r
+ } else {\r
+ \r
+ return (byte[])processor.performForEach(graph, entry, parent, listener, procedure);\r
+ \r
+ }\r
+\r
+ }\r
+ \r
+ final public static byte[] queryEach(ReadGraphImpl graph, final int r, final CacheEntry parent, final ListenerBase listener, final InternalProcedure<byte[]> procedure) {\r
+ \r
+ assert(r != 0);\r
+ \r
+ if(graph.parent == null && listener == null) {\r
+ return ValueQuery.computeForEach(graph, r, null, procedure);\r
+ } else {\r
+ return runner(graph, r, parent, listener, procedure);\r
+ }\r
+ \r
+ }\r
+\r
+ final public static byte[] queryEach(ReadGraphImpl graph, final int r, final CacheEntry parent) {\r
+ \r
+ assert(r != 0);\r
+ \r
+ if(graph.parent == null) {\r
+ return ValueQuery.computeForEach(graph, r);\r
+ } else {\r
+ return runner(graph, r, parent, null, null);\r
+ }\r
+ \r
+ }\r
+ \r
+ @Override\r
+ public UnaryQuery<InternalProcedure<byte[]>> getEntry(QueryProcessor provider) {\r
+ return provider.valueMap.get(id);\r
+ }\r
+ \r
+ @Override\r
+ public void putEntry(QueryProcessor provider) {\r
+ provider.valueMap.put(id, this);\r
+ }\r
+\r
+ @Override\r
+ final public void removeEntry(QueryProcessor provider) {\r
+ provider.valueMap.remove(id);\r
+ }\r
+ \r
+ \r
+ public static byte[] computeForEach(ReadGraphImpl graph, final int r, final ValueQuery entry, final InternalProcedure<byte[]> procedure) {\r
+\r
+ graph.ensureLoaded(r);\r
+ \r
+ byte[] value = graph.getValue(r);\r
+ if(entry != null) {\r
+ entry.setResult(value);\r
+ entry.setReady();\r
+ }\r
+ if(procedure != null) {\r
+ procedure.execute(graph, value);\r
+ }\r
+ \r
+ return value;\r
+ \r
+ }\r
+\r
+ public static byte[] computeForEach(ReadGraphImpl graph, final int r) {\r
+\r
+ graph.ensureLoaded(r);\r
+ \r
+ return graph.getValue(r);\r
+ \r
+ }\r
+ \r
+ @Override\r
+ public Object computeForEach(ReadGraphImpl graph, final QueryProcessor queryProvider, final InternalProcedure<byte[]> procedure, final boolean store) {\r
+ return computeForEach(graph, id, this, procedure);\r
+ }\r
+ \r
+ @Override\r
+ public String toString() {\r
+ return "Value[" + id + "]";\r
+ }\r
+\r
+ @Override\r
+ public Object performFromCache(ReadGraphImpl graph, QueryProcessor queryProvider, InternalProcedure<byte[]> procedure) {\r
+ return computeForEach(graph, queryProvider, procedure, false);\r
+ }\r
+ \r
+ @Override\r
+ public void recompute(ReadGraphImpl graph, QueryProcessor provider) {\r
+\r
+ final Semaphore s = new Semaphore(0);\r
+ \r
+ computeForEach(graph, provider, new InternalProcedure<byte[]>() {\r
+\r
+ @Override\r
+ public void execute(ReadGraphImpl graph, byte[] result) {\r
+ s.release();\r
+ }\r
+ \r
+ @Override\r
+ public void exception(ReadGraphImpl graph, Throwable t) {\r
+ throw new Error("Error in recompute.", t);\r
+ }\r
+\r
+ }, true);\r
+ \r
+ while(!s.tryAcquire()) {\r
+ provider.resume(graph);\r
+ }\r
+ \r
+ }\r
+ \r
+ @Override\r
+ boolean isImmutable(ReadGraphImpl graph) {\r
+ return graph.processor.isImmutable(id);\r
+ } \r
+ \r
+}\r