Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.impl / src / org / simantics / db / impl / query / ValueQuery.java

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ValueQuery.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ValueQuery.java
new file mode 100644 (file)
index 0000000..7e4b2e1
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ValueQuery.java
@@ -0,0 +1,162 @@
+/*******************************************************************************\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