From: Marko Luukkainen <marko.luukkainen@semantum.fi>
Date: Tue, 13 Apr 2021 06:23:47 +0000 (+0300)
Subject: Performance optimizations for NatTableGraphExplorer
X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=commitdiff_plain;h=7018c62d56cf7ac26973d40b01027c2c050cc4d1;p=simantics%2Fplatform.git

Performance optimizations for NatTableGraphExplorer

Fine tuned dispose logic to avoid single item removals when whole GE is
disposed.

Node expand was causing unnecessary events, when it tried to expand
non-expandable node.

#692

Change-Id: I06938693af2b28dc51b5d2d5a0269cfde7121fc7
(cherry picked from commit d7ce5ab37a70cf207e3bfe0045c0df3f1fb98415)
---

diff --git a/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/NatTableGraphExplorer.java b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/NatTableGraphExplorer.java
index 37eafd4eb..9d12fd9b5 100644
--- a/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/NatTableGraphExplorer.java
+++ b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/NatTableGraphExplorer.java
@@ -993,11 +993,15 @@ public class NatTableGraphExplorer extends GraphExplorerImplBase implements Grap
        //       we have to remove all references here to reduce memory consumption.
        //	
        //       Proper fix would be to remove references between QueryCache and GENodeQueryManagers.
+    	
+    	// Clearing explorerContext replaces GECache with dummy implementation, which makes node disposal much faster.
+    	explorerContext.close();
     	if (rootNode != null) {
-     		rootNode.dispose();
+    		// Using fastDispose bypasses item removal from nodeMap, which is cleared later. 
+     		rootNode.fastDispose();
          	rootNode = null;	
         }	
-        explorerContext.dispose();
+    	explorerContext.dispose();
         explorerContext = null;
         processors.clear();
         detachPrimitiveProcessors();
@@ -1026,8 +1030,7 @@ public class NatTableGraphExplorer extends GraphExplorerImplBase implements Grap
         }
         resourceManager.dispose();
         resourceManager = null;
-       		
-        contextToNodeMap.clear(); // should be empty at this point.
+        contextToNodeMap.clear();	
         contextToNodeMap = null;
         if (postSelectionProvider != null) {
         	postSelectionProvider.dispose();
@@ -2394,6 +2397,13 @@ public class NatTableGraphExplorer extends GraphExplorerImplBase implements Grap
             }
         };
         
+        public void close() {
+        	cache.dispose();
+        	cache = new DummyCache();
+        	scheduleList.clear();
+        	autoExpanded.clear();
+        }
+        
         @Override
         public void dispose() {
         	cache.dispose();
@@ -2605,6 +2615,7 @@ public class NatTableGraphExplorer extends GraphExplorerImplBase implements Grap
 		final HashMap<GECacheKey, IGECacheEntry> entries = new HashMap<GECacheKey, IGECacheEntry>();
 		final HashMap<GECacheKey, Set<UIElementReference>> treeReferences = new HashMap<GECacheKey, Set<UIElementReference>>();
 		final HashMap<NodeContext, Set<GECacheKey>> keyRefs = new HashMap<NodeContext, Set<GECacheKey>>();
+		private TObjectIntHashMap<NodeContext> references = new TObjectIntHashMap<NodeContext>();
 		
 		 /**
 	     * This single instance is used for all get operations from the cache. This
@@ -2731,7 +2742,7 @@ public class NatTableGraphExplorer extends GraphExplorerImplBase implements Grap
 	    	return references.get(context) > 0;
 	    }
 
-	    private TObjectIntHashMap<NodeContext> references = new TObjectIntHashMap<NodeContext>();
+	    
 	    
 	    @Override
 	    public void incRef(NodeContext context) {
diff --git a/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/TreeNode.java b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/TreeNode.java
index 4f9273d91..529d02f49 100644
--- a/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/TreeNode.java
+++ b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/TreeNode.java
@@ -295,6 +295,25 @@ public class TreeNode implements IAdaptable {
 		manager = null;	
 	}
 	
+	/**
+	 * Fast dispose is used to wipe the whole tree.
+	 * 
+	 * ContextToNodeMap is cleared with one command, so we do not need to remove nodes one by one from the map.
+	 */
+	public void fastDispose() {
+		if (DEBUG)	System.out.println("dispose " + this);
+		parent = null;
+		for (TreeNode n : children) {
+			n.fastDispose();
+		}
+		clearCache();
+		children.clear();
+		context = null;
+		explorerContext = null;
+		manager.dispose();
+		manager = null;	
+	}
+	
 	private void clearCache() {
 		if (explorerContext != null) {
 			GECache2 cache = explorerContext.cache;
diff --git a/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/TreeLayer2.java b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/TreeLayer2.java
index a44944ce6..ef09936c4 100644
--- a/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/TreeLayer2.java
+++ b/bundles/org.simantics.browsing.ui.nattable/src/org/simantics/browsing/ui/nattable/override/TreeLayer2.java
@@ -383,6 +383,8 @@ public class TreeLayer2 extends AbstractRowHideShowLayer2 {
         List<Integer> rowIndexes = this.treeRowModel.expand(parentIndex);
         // Bug 432865: iterating and removing every single item is faster than
         // removeAll()
+        if (rowIndexes.isEmpty())
+        	return;
         for (final Integer expandedChildRowIndex : rowIndexes) {
             this.hiddenRowIndexes.remove(expandedChildRowIndex);
         }