--- /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.common.processor;\r
+\r
+import java.util.concurrent.ConcurrentLinkedQueue;\r
+\r
+import org.simantics.db.AsyncRequestProcessor;\r
+import org.simantics.db.VirtualGraph;\r
+import org.simantics.db.WriteOnlyGraph;\r
+import org.simantics.db.common.request.WriteOnlyRequest;\r
+import org.simantics.db.common.utils.Logger;\r
+import org.simantics.db.exception.DatabaseException;\r
+import org.simantics.db.request.WriteOnly;\r
+\r
+final public class MergingWriteOnlyProcessor extends ProcessorBase {\r
+\r
+ final long transactionKeepalivePeriod;\r
+ final ConcurrentLinkedQueue<WriteOnly> queue = new ConcurrentLinkedQueue<WriteOnly>(); \r
+ final private AsyncRequestProcessor processor;\r
+ final private VirtualGraph vg;\r
+\r
+ boolean hasAlreadyRequest = false;\r
+\r
+ public MergingWriteOnlyProcessor(AsyncRequestProcessor processor, VirtualGraph vg, long transactionKeepalivePeriod) {\r
+ this.processor = processor;\r
+ this.vg = vg;\r
+ this.transactionKeepalivePeriod = transactionKeepalivePeriod;\r
+ }\r
+\r
+ class MergedWrite extends WriteOnlyRequest {\r
+\r
+ public MergedWrite(VirtualGraph vg) {\r
+ super(vg);\r
+ }\r
+ \r
+ @Override\r
+ public void perform(WriteOnlyGraph graph) throws DatabaseException {\r
+\r
+// System.out.println("MergedWrite begins");\r
+\r
+ while (true) {\r
+ \r
+ WriteOnly next = queue.poll();\r
+ if(next == null) {\r
+ synchronized (MergingWriteOnlyProcessor.this) {\r
+ if (transactionKeepalivePeriod > 0) {\r
+ try {\r
+ MergingWriteOnlyProcessor.this.wait(transactionKeepalivePeriod);\r
+ } catch (InterruptedException e) {\r
+ Logger.defaultLogError(e);\r
+ }\r
+ next = queue.poll();\r
+ }\r
+ if(next == null) {\r
+ hasAlreadyRequest = false;\r
+// System.out.println("MergedWrite ends");\r
+ return;\r
+ }\r
+ }\r
+ }\r
+\r
+// System.out.println("MergedWrite executes " + next);\r
+ try {\r
+ next.perform(graph);\r
+ } catch(Throwable t) {\r
+ Logger.defaultLogError(t);\r
+ }\r
+\r
+ }\r
+\r
+ }\r
+\r
+ }\r
+\r
+ @Override\r
+ public void asyncRequest(WriteOnly request) {\r
+ \r
+ queue.add(request);\r
+\r
+ synchronized (this) {\r
+ \r
+ if (!hasAlreadyRequest) {\r
+ processor.asyncRequest(new MergedWrite(vg));\r
+ hasAlreadyRequest = true;\r
+ } else {\r
+ notify();\r
+ }\r
+ \r
+ }\r
+\r
+ }\r
+\r
+ @Override\r
+ public String toString() {\r
+ return "MergingWriteOnlyProcessor@" + System.identityHashCode(this) + " (based on " + processor + ")";\r
+ }\r
+\r
+}\r