Bug 399419 - [visualizer] Minimize visualizer model (re-)creation

Change-Id: I74bddda8a2eb814c04b93089d10bbb0683e747f5
Reviewed-on: https://git.eclipse.org/r/11601
IP-Clean: Marc Khouzam <marc.khouzam@ericsson.com>
Tested-by: Marc Khouzam <marc.khouzam@ericsson.com>
Reviewed-by: William Swanson <traveler@tilera.com>
Reviewed-by: Marc Khouzam <marc.khouzam@ericsson.com>

3 files changed, 107 insertions, 46 deletions

diff --git a/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizer.java b/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizer.java
index 76910a4fa53..65443da8b91 100755
--- a/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizer.java
+++ b/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizer.java
@@ -10,6 +10,7 @@
  *     IBM Corporation
  *     Marc Dumais (Ericsson) - Bug 399281
  *     Marc Dumais (Ericsson) - Add CPU/core load information to the multicore visualizer (Bug 396268)
+ *     Marc Dumais (Ericsson) - Bug 399419
  *******************************************************************************/
 
 package org.eclipse.cdt.dsf.gdb.multicorevisualizer.internal.ui.view;
@@ -665,7 +666,8 @@ public class MulticoreVisualizer extends GraphicCanvasVisualizer
 					{
 						// Execute a refresh after any pending UI updates.
 						GUIUtils.exec( new Runnable() { @Override public void run() {
-							MulticoreVisualizer.this.refresh();
+							// check if we need to update the debug context
+							updateDebugContext();
 						}});
 					}
 				};
@@ -692,8 +694,20 @@ public class MulticoreVisualizer extends GraphicCanvasVisualizer
 	@Override
 	public void workbenchSelectionChanged(ISelection selection)
 	{
-		refresh();
-		
+		// See if we need to update our debug info from
+		// the workbench selection. This will be done asynchronously.
+		boolean changed = updateDebugContext();
+
+		if (changed) {
+			update();
+		}
+		else {
+			// Even if debug info doesn't change, we still want to
+			// check whether the canvas selection needs to change
+			// to reflect the current workbench selection.
+			updateCanvasSelection();
+		}
+
 		// Also check whether we need to attach debug view listener.
 		updateDebugViewListener();
 	}
@@ -701,14 +715,8 @@ public class MulticoreVisualizer extends GraphicCanvasVisualizer
 	/** Refreshes visualizer content from model. */
 	public void refresh()
 	{
-		// See if we need to update our debug info from
-		// the workbench selection. This will be done asynchronously.
-		boolean changed = updateDebugContext();
-		
-		// Even if debug info doesn't change, we still want to
-		// check whether the canvas selection needs to change
-		// to reflect the current workbench selection.
-		if (!changed) updateCanvasSelection();
+		m_canvas.requestRecache();
+		m_canvas.requestUpdate();
 	}
 	
 
@@ -829,7 +837,7 @@ public class MulticoreVisualizer extends GraphicCanvasVisualizer
 	 *  Returns true if canvas context actually changes, false if not.
 	 */
 	public boolean setDebugSession(String sessionId) {
-		boolean changed = true;
+		boolean changed = false;
 
 		if (m_sessionState != null &&
 			! m_sessionState.getSessionID().equals(sessionId))
@@ -854,8 +862,6 @@ public class MulticoreVisualizer extends GraphicCanvasVisualizer
 			initializeLoadMeterTimer();
 			changed = true;
 		}
-	
-		if (changed) update();
 		
 		return changed;
 	}
@@ -1102,7 +1108,12 @@ public class MulticoreVisualizer extends GraphicCanvasVisualizer
 		// If we can't get the real Linux OS tid, fallback to using the gdb thread id
 		int osTid = (osTIDValue == null) ? tid : Integer.parseInt(osTIDValue);
 
-		model.addThread(new VisualizerThread(core, pid, osTid, tid, state));
+		// add thread if not already there - there is a potential race condition where a 
+		// thread can be added twice to the model: once at model creation and once more 
+		// through the listener.   Checking at both places to prevent this.
+		if (model.getThread(tid) == null) {
+			model.addThread(new VisualizerThread(core, pid, osTid, tid, state));
+		}
 		
 		// keep track of threads visited
 		done(1, model);
diff --git a/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerCanvas.java b/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerCanvas.java
index 9ba43feeb85..6a9e554f4a1 100755
--- a/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerCanvas.java
+++ b/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerCanvas.java
@@ -13,6 +13,7 @@
  *     Marc Dumais (Ericsson) - Bug 396293
  *     Marc Dumais (Ericsson) - Bug 399281
  *     Marc Dumais (Ericsson) - Add CPU/core load information to the multicore visualizer (Bug 396268)
+ *     Marc Dumais (Ericsson) - Bug 399419
  *******************************************************************************/
 
 package org.eclipse.cdt.dsf.gdb.multicorevisualizer.internal.ui.view;
@@ -970,13 +971,14 @@ public class MulticoreVisualizerCanvas extends GraphicCanvas
 	@Override
 	public void setSelection(ISelection selection)
 	{
-		m_selectionManager.setSelection(selection);
+		setSelection(selection, true);
 	}
 	
 	/** Sets externally-visible selection. */
 	public void setSelection(ISelection selection, boolean raiseEvent)
 	{
 		m_selectionManager.setSelection(selection, raiseEvent);
+		requestUpdate();
 	}
 	
     /** Sets whether selection events are enabled. */
diff --git a/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerEventListener.java b/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerEventListener.java
index bd8e70615a7..f33b780800b 100644
--- a/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerEventListener.java
+++ b/dsf-gdb/org.eclipse.cdt.dsf.gdb.multicorevisualizer.ui/src/org/eclipse/cdt/dsf/gdb/multicorevisualizer/internal/ui/view/MulticoreVisualizerEventListener.java
@@ -8,12 +8,14 @@
  * Contributors:
  *     Marc Khouzam (Ericsson) - initial API and implementation
  *     Marc Dumais (Ericsson) - Bug 400231
+ *     Marc Dumais (Ericsson) - Bug 399419
  *******************************************************************************/
 
 package org.eclipse.cdt.dsf.gdb.multicorevisualizer.internal.ui.view;
 
 import org.eclipse.cdt.dsf.concurrent.ImmediateDataRequestMonitor;
 import org.eclipse.cdt.dsf.datamodel.DMContexts;
+import org.eclipse.cdt.dsf.datamodel.DataModelInitializedEvent;
 import org.eclipse.cdt.dsf.datamodel.IDMContext;
 import org.eclipse.cdt.dsf.debug.service.IProcesses;
 import org.eclipse.cdt.dsf.debug.service.IProcesses.IThreadDMContext;
@@ -61,39 +63,72 @@ public class MulticoreVisualizerEventListener {
 	
 	// --- event handlers ---
 	
-	/** Invoked when a thread or process is suspended. */
+	/** 
+	 * Invoked when a thread or process is suspended. 
+	 * Updates both state of the thread and the core it's running on
+	 */
 	@DsfServiceEventHandler
-	public void handleEvent(ISuspendedDMEvent event) {
+	public void handleEvent(final ISuspendedDMEvent event) {
 		IDMContext context = event.getDMContext();
 		if (context instanceof IContainerDMContext) {
     		// We don't deal with processes
     	} else if (context instanceof IMIExecutionDMContext) {
     		// Thread suspended
-    		int tid = ((IMIExecutionDMContext)context).getThreadId();
-
-    		VisualizerThread thread = fVisualizer.getModel().getThread(tid);
     		
-    		if (thread != null) {
-    			assert thread.getState() == VisualizerExecutionState.RUNNING;
-    			
-    			VisualizerExecutionState newState = VisualizerExecutionState.SUSPENDED;
-
-    			if (event.getReason() == StateChangeReason.SIGNAL) {
-    				if (event instanceof IMIDMEvent) {
-    					Object miEvent = ((IMIDMEvent)event).getMIEvent();
-    					if (miEvent instanceof MISignalEvent) {
-    						String signalName = ((MISignalEvent)miEvent).getName();
-    						if (DSFDebugModel.isCrashSignal(signalName)) {
-    							newState = VisualizerExecutionState.CRASHED;
-    						}
-    						
-    					}
-    				}
-    			}
-
-    			thread.setState(newState);
-    			fVisualizer.getMulticoreVisualizerCanvas().requestUpdate();
-    		}
+    		final IMIExecutionDMContext execDmc = (IMIExecutionDMContext)context;
+			IThreadDMContext threadContext =
+					DMContexts.getAncestorOfType(execDmc, IThreadDMContext.class);
+
+			DsfServicesTracker tracker = 
+					new DsfServicesTracker(MulticoreVisualizerUIPlugin.getBundleContext(), 
+                                           execDmc.getSessionId());
+			IProcesses procService = tracker.getService(IProcesses.class);
+			tracker.dispose();
+			
+			procService.getExecutionData(threadContext, 
+				new ImmediateDataRequestMonitor<IThreadDMData>() {
+					@Override
+					protected void handleSuccess() {
+						IThreadDMData data = getData();
+					
+						// Check whether we know about cores
+						if (data instanceof IGdbThreadDMData) {
+							String[] cores = ((IGdbThreadDMData)data).getCores();
+							if (cores != null) {
+								assert cores.length == 1; // A thread belongs to a single core
+								int coreId = Integer.parseInt(cores[0]);
+								VisualizerCore vCore = fVisualizer.getModel().getCore(coreId);
+								
+								int tid = execDmc.getThreadId();
+																
+					    		VisualizerThread thread = fVisualizer.getModel().getThread(tid);
+					    		
+					    		if (thread != null) {
+					    			assert thread.getState() == VisualizerExecutionState.RUNNING;
+					    			
+					    			VisualizerExecutionState newState = VisualizerExecutionState.SUSPENDED;
+
+					    			if (event.getReason() == StateChangeReason.SIGNAL) {
+					    				if (event instanceof IMIDMEvent) {
+					    					Object miEvent = ((IMIDMEvent)event).getMIEvent();
+					    					if (miEvent instanceof MISignalEvent) {
+					    						String signalName = ((MISignalEvent)miEvent).getName();
+					    						if (DSFDebugModel.isCrashSignal(signalName)) {
+					    							newState = VisualizerExecutionState.CRASHED;
+					    						}
+					    					}
+					    				}
+					    			}
+
+					    			thread.setState(newState);
+					    			thread.setCore(vCore);
+					    			fVisualizer.getMulticoreVisualizerCanvas().requestUpdate();
+					    		}
+							}
+						}
+					}
+				}
+			);
     	}
 	}
 
@@ -165,9 +200,13 @@ public class MulticoreVisualizerEventListener {
 									// That is ok, we'll be refreshing right away at startup
 								}
 
-								fVisualizer.getModel().addThread(new VisualizerThread(vCore, pid, osTid, tid, VisualizerExecutionState.RUNNING));
-								
-								fVisualizer.getMulticoreVisualizerCanvas().requestUpdate();
+								// add thread if not already there - there is a potential race condition where a 
+								// thread can be added twice to the model: once at model creation and once more 
+								// through the listener.   Checking at both places to prevent this.
+								if (fVisualizer.getModel().getThread(tid) == null ) {
+									fVisualizer.getModel().addThread(new VisualizerThread(vCore, pid, osTid, tid, VisualizerExecutionState.RUNNING));
+									fVisualizer.getMulticoreVisualizerCanvas().requestUpdate();	
+								}
 							}
 						}
 					}
@@ -193,6 +232,15 @@ public class MulticoreVisualizerEventListener {
 				canvas.requestUpdate();
 			}
     	}
-	}	
+	}
+
+	
+	/** Invoked when the debug data model is ready */
+	@DsfServiceEventHandler
+	public void handleEvent(DataModelInitializedEvent event) {
+		// re-create the visualizer model now that CPU and core info is available
+		fVisualizer.update();
+	}
+
 }