X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2Fprocessor%2FMergingWriteOnlyProcessor.java;fp=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2Fprocessor%2FMergingWriteOnlyProcessor.java;h=6c6883dea955ddbf3c8fb50d11912d31cbe50a0c;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/processor/MergingWriteOnlyProcessor.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/processor/MergingWriteOnlyProcessor.java
new file mode 100644
index 000000000..6c6883dea
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/processor/MergingWriteOnlyProcessor.java
@@ -0,0 +1,107 @@
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 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
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.db.common.processor;
+
+import java.util.concurrent.ConcurrentLinkedQueue;
+
+import org.simantics.db.AsyncRequestProcessor;
+import org.simantics.db.VirtualGraph;
+import org.simantics.db.WriteOnlyGraph;
+import org.simantics.db.common.request.WriteOnlyRequest;
+import org.simantics.db.common.utils.Logger;
+import org.simantics.db.exception.DatabaseException;
+import org.simantics.db.request.WriteOnly;
+
+final public class MergingWriteOnlyProcessor extends ProcessorBase {
+
+    final long transactionKeepalivePeriod;
+    final ConcurrentLinkedQueue<WriteOnly> queue = new ConcurrentLinkedQueue<WriteOnly>(); 
+    final private AsyncRequestProcessor processor;
+    final private VirtualGraph vg;
+
+    boolean hasAlreadyRequest = false;
+
+    public MergingWriteOnlyProcessor(AsyncRequestProcessor processor, VirtualGraph vg, long transactionKeepalivePeriod) {
+        this.processor = processor;
+        this.vg = vg;
+        this.transactionKeepalivePeriod = transactionKeepalivePeriod;
+    }
+
+    class MergedWrite extends WriteOnlyRequest {
+
+    	public MergedWrite(VirtualGraph vg) {
+    		super(vg);
+		}
+    	
+        @Override
+        public void perform(WriteOnlyGraph graph) throws DatabaseException {
+
+//            System.out.println("MergedWrite begins");
+
+            while (true) {
+                
+                WriteOnly next = queue.poll();
+                if(next == null) {
+                    synchronized (MergingWriteOnlyProcessor.this) {
+                        if (transactionKeepalivePeriod > 0) {
+                            try {
+                                MergingWriteOnlyProcessor.this.wait(transactionKeepalivePeriod);
+                            } catch (InterruptedException e) {
+                	    		Logger.defaultLogError(e);
+                            }
+                            next = queue.poll();
+                        }
+                        if(next == null) {
+                            hasAlreadyRequest = false;
+//                            System.out.println("MergedWrite ends");
+                            return;
+                        }
+                    }
+                }
+
+//                System.out.println("MergedWrite executes " + next);
+                try {
+                	next.perform(graph);
+                } catch(Throwable t) {
+    	    		Logger.defaultLogError(t);
+                }
+
+            }
+
+        }
+
+    }
+
+    @Override
+    public void asyncRequest(WriteOnly request) {
+        
+        queue.add(request);
+
+        synchronized (this) {
+        
+          if (!hasAlreadyRequest) {
+              processor.asyncRequest(new MergedWrite(vg));
+              hasAlreadyRequest = true;
+          } else {
+              notify();
+          }
+          
+        }
+
+    }
+
+    @Override
+    public String toString() {
+        return "MergingWriteOnlyProcessor@" + System.identityHashCode(this) + " (based on " + processor + ")";
+    }
+
+}