Story #38 - CPU Usage graph

11 files changed, 159 insertions, 163 deletions

diff --git a/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/ClusterListener.java b/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/ClusterListener.java
index 2a4a9920..355483e7 100644
--- a/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/ClusterListener.java
+++ b/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/ClusterListener.java
@@ -52,4 +52,6 @@ public interface ClusterListener {
 	public void alertRemoved(Alert alert);
 	
 	public void alertUpdated(Alert alert);
+	
+	public void aggregatedStatsChanged();
 }
diff --git a/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/DefaultClusterListener.java b/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/DefaultClusterListener.java
index e72ff3e5..6a3c5dae 100644
--- a/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/DefaultClusterListener.java
+++ b/src/com.gluster.storage.management.core/src/com/gluster/storage/management/core/model/DefaultClusterListener.java
@@ -110,4 +110,9 @@ public class DefaultClusterListener implements ClusterListener {
 	public void alertUpdated(Alert alert) {
 		modelChanged();
 	}
+
+	@Override
+	public void aggregatedStatsChanged() {
+		modelChanged();
+	}
 }
diff --git a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/GlusterDataModelManager.java b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/GlusterDataModelManager.java
index 33132c64..afc0e7aa 100644
--- a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/GlusterDataModelManager.java
+++ b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/GlusterDataModelManager.java
@@ -201,8 +201,17 @@ public class GlusterDataModelManager {
 		updateDiscoveredServers(model);
 		updateTasks(model);
 		updateAlerts(model);
+		updateServerStatistics(model);
 	}
 	
+	private void updateServerStatistics(GlusterDataModel newModel) {
+		model.getCluster().setAggregatedCpuStats(newModel.getCluster().getAggregatedCpuStats());
+		model.getCluster().setAggregatedNetworkStats(newModel.getCluster().getAggregatedNetworkStats());
+		for(ClusterListener listener : listeners) {
+			listener.aggregatedStatsChanged();
+		}
+	}
+
 	private void updateAlerts(GlusterDataModel newModel) {
 		List<Alert> oldAlerts = model.getCluster().getAlerts();
 		List<Alert> newAlerts = newModel.getCluster().getAlerts();
diff --git a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/preferences/ChartsPreferencePage.java b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/preferences/ChartsPreferencePage.java
index 2d16fcd2..850407d1 100644
--- a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/preferences/ChartsPreferencePage.java
+++ b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/preferences/ChartsPreferencePage.java
@@ -20,28 +20,20 @@ package com.gluster.storage.management.gui.preferences;
 
 import org.eclipse.jface.preference.ComboFieldEditor;
 import org.eclipse.jface.preference.FieldEditorPreferencePage;
-import org.eclipse.jface.resource.ImageDescriptor;
 import org.eclipse.ui.IWorkbench;
 import org.eclipse.ui.IWorkbenchPreferencePage;
 
+import com.gluster.storage.management.gui.Activator;
+
 /**
  *
  */
 public class ChartsPreferencePage extends FieldEditorPreferencePage implements IWorkbenchPreferencePage {
 
 	public ChartsPreferencePage() {
-	}
-
-	public ChartsPreferencePage(int style) {
-		super(style);
-	}
-
-	public ChartsPreferencePage(String title, int style) {
-		super(title, style);
-	}
-
-	public ChartsPreferencePage(String title, ImageDescriptor image, int style) {
-		super(title, image, style);
+		super(GRID);
+		setPreferenceStore(Activator.getDefault().getPreferenceStore());
+		setDescription("Gluster Management Console");
 	}
 
 	/* (non-Javadoc)
@@ -57,8 +49,7 @@ public class ChartsPreferencePage extends FieldEditorPreferencePage implements I
 	@Override
 	protected void createFieldEditors() {
 		String[][] entryNamesAndValues = new String[][] {
-				{ "1d", "1d" }, { "1w", "1w" }, { "1m", "1m" }, { "1y", "1y" } };
-		//{ "1 day", "1d" }, { "1 week", "1w" }, { "1 month", "1m" }, { "1 year", "1y" } };
+				{ "1 day", "1d" }, { "1 week", "1w" }, { "1 month", "1m" }, { "1 year", "1y" } };
 		addField(new ComboFieldEditor(PreferenceConstants.P_CPU_CHART_PERIOD, "CPU Usage chart period", entryNamesAndValues,
 				getFieldEditorParent()));
 		addField(new ComboFieldEditor(PreferenceConstants.P_MEM_CHART_PERIOD, "Memory Usage chart period", entryNamesAndValues,
diff --git a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/utils/ChartViewerComposite.java b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/utils/ChartViewerComposite.java
index 30982096..95f0277c 100644
--- a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/utils/ChartViewerComposite.java
+++ b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/utils/ChartViewerComposite.java
@@ -18,8 +18,6 @@
  *******************************************************************************/
 package com.gluster.storage.management.gui.utils;
 
-import java.lang.reflect.InvocationTargetException;
-import java.util.Locale;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 
@@ -30,7 +28,6 @@ import org.eclipse.birt.chart.exception.ChartException;
 import org.eclipse.birt.chart.factory.GeneratedChartState;
 import org.eclipse.birt.chart.factory.Generator;
 import org.eclipse.birt.chart.model.Chart;
-import org.eclipse.birt.chart.model.ChartWithAxes;
 import org.eclipse.birt.chart.model.ChartWithoutAxes;
 import org.eclipse.birt.chart.model.attribute.Anchor;
 import org.eclipse.birt.chart.model.attribute.AxisType;
@@ -39,7 +36,6 @@ import org.eclipse.birt.chart.model.attribute.ChartDimension;
 import org.eclipse.birt.chart.model.attribute.FontDefinition;
 import org.eclipse.birt.chart.model.attribute.LineAttributes;
 import org.eclipse.birt.chart.model.attribute.LineStyle;
-import org.eclipse.birt.chart.model.attribute.NumberFormatSpecifier;
 import org.eclipse.birt.chart.model.attribute.TickStyle;
 import org.eclipse.birt.chart.model.attribute.impl.BoundsImpl;
 import org.eclipse.birt.chart.model.attribute.impl.ColorDefinitionImpl;
@@ -72,16 +68,6 @@ import org.eclipse.birt.chart.model.type.impl.AreaSeriesImpl;
 import org.eclipse.birt.chart.model.type.impl.PieSeriesImpl;
 import org.eclipse.birt.core.framework.PlatformConfig;
 import org.eclipse.core.runtime.Platform;
-import org.eclipse.emf.common.notify.Adapter;
-import org.eclipse.emf.common.notify.Notification;
-import org.eclipse.emf.common.util.EList;
-import org.eclipse.emf.common.util.TreeIterator;
-import org.eclipse.emf.ecore.EClass;
-import org.eclipse.emf.ecore.EObject;
-import org.eclipse.emf.ecore.EOperation;
-import org.eclipse.emf.ecore.EReference;
-import org.eclipse.emf.ecore.EStructuralFeature;
-import org.eclipse.emf.ecore.resource.Resource;
 import org.eclipse.swt.events.ControlEvent;
 import org.eclipse.swt.events.ControlListener;
 import org.eclipse.swt.events.PaintEvent;
@@ -92,7 +78,6 @@ import org.eclipse.swt.graphics.Rectangle;
 import org.eclipse.swt.widgets.Composite;
 
 import com.ibm.icu.util.Calendar;
-import com.ibm.icu.util.ULocale;
 
 /**
  * 
@@ -139,12 +124,13 @@ public final class ChartViewerComposite extends Composite implements PaintListen
 	 * @param values
 	 *            Values of each category in the pie chart Constructs a pie
 	 *            chart viewer composite for given categories and values
+	 * @param maxValue 
 	 */
-	public ChartViewerComposite(Composite parent, int style, Calendar[] categories, Double[] values, String unit, String timestampFormat) {
+	public ChartViewerComposite(Composite parent, int style, Calendar[] categories, Double[] values, String unit, String timestampFormat, double maxValue) {
 		super(parent, style);
 		init();
 
-		createSingleAreaChart(categories, values, unit, timestampFormat);
+		createSingleAreaChart(categories, values, unit, timestampFormat, maxValue);
 		addPaintListener(this);
 	}
 
@@ -170,17 +156,18 @@ public final class ChartViewerComposite extends Composite implements PaintListen
 		});
 	}
 
-	private void createSingleAreaChart(Calendar[] timestamps, Double[] values, String unit, String timestampFormat) {
-		createAreaChart(timestamps, new Double[][] {values}, unit, timestampFormat);
+	private void createSingleAreaChart(Calendar[] timestamps, Double[] values, String unit, String timestampFormat, double maxValue) {
+		createAreaChart(timestamps, new Double[][] {values}, unit, timestampFormat, maxValue);
 	}
 
 	/**
 	 * Creates a line chart model as a reference implementation
+	 * @param maxValue 
 	 * 
 	 * @return An instance of the simulated runtime chart model (containing
 	 *         filled datasets)
 	 */
-	private final void createAreaChart(Calendar[] timestamps, Double[][] values, final String unit, final String timestampFormat) {
+	private final void createAreaChart(Calendar[] timestamps, Double[][] values, final String unit, final String timestampFormat, double maxValue) {
 		chart = ChartWithAxesImpl.create();
 		// Plot
 		chart.getBlock().setBackground(ColorDefinitionImpl.WHITE());
@@ -206,12 +193,12 @@ public final class ChartViewerComposite extends Composite implements PaintListen
 		lg.getOutline( ).setVisible( false );
 		lg.setAnchor( Anchor.NORTH_LITERAL );
 
-		updateDataSet(timestamps, values, unit, timestampFormat);
+		updateDataSet(timestamps, values, unit, timestampFormat, maxValue);
 	}
 
-	private void updateDataSet(Calendar[] timestamps, Double[][] values, final String unit, final String timestampFormat) {
+	private void updateDataSet(Calendar[] timestamps, Double[][] values, final String unit, final String timestampFormat, double maxValue) {
 		Axis xAxisPrimary = setupXAxis(timestamps, timestampFormat);
-		Axis yAxisPrimary = setupYAxis(unit, xAxisPrimary);
+		Axis yAxisPrimary = setupYAxis(unit, xAxisPrimary, maxValue);
 		configureXSeries(timestamps, xAxisPrimary);
 		configureYSeries(values, yAxisPrimary);
 	}
@@ -253,9 +240,11 @@ public final class ChartViewerComposite extends Composite implements PaintListen
 		sdX.getSeries().add(seCategory);
 	}
 
-	private Axis setupYAxis(final String unit, Axis xAxisPrimary) {
+	private Axis setupYAxis(final String unit, Axis xAxisPrimary, double maxValue) {
 		Axis yAxisPrimary = ((ChartWithAxesImpl)chart).getPrimaryOrthogonalAxis(xAxisPrimary);
-		yAxisPrimary.getScale().setMax(NumberDataElementImpl.create(100));
+		if(maxValue > 0) {
+			yAxisPrimary.getScale().setMax(NumberDataElementImpl.create(maxValue));
+		}
 		yAxisPrimary.getScale().setMin(NumberDataElementImpl.create(0));
 		yAxisPrimary.setGapWidth(0);
 		yAxisPrimary.getScale().setStep(20);
@@ -396,26 +385,26 @@ public final class ChartViewerComposite extends Composite implements PaintListen
 		}
 	}
 	
-	public void chartRefresh(Calendar[] timestamps, Double[][] values, String unit, String timestampFormat)
-	{
-		if ( !isDisposed( ) )
-		{
-			final Generator gr = Generator.instance( );
-			updateDataSet( timestamps, values, unit, timestampFormat);
-
-			// Refresh
-			try
-			{
-				gr.refresh( generatedChartState );
-			}
-			catch ( ChartException ex )
-			{
-				// TODO: log the exception
-				ex.printStackTrace( );
-			}
-			redraw( );
-		}
-	}
+//	public void chartRefresh(Calendar[] timestamps, Double[][] values, String unit, String timestampFormat)
+//	{
+//		if ( !isDisposed( ) )
+//		{
+//			final Generator gr = Generator.instance( );
+//			updateDataSet( timestamps, values, unit, timestampFormat);
+//
+//			// Refresh
+//			try
+//			{
+//				gr.refresh( generatedChartState );
+//			}
+//			catch ( ChartException ex )
+//			{
+//				// TODO: log the exception
+//				ex.printStackTrace( );
+//			}
+//			redraw( );
+//		}
+//	}
 
 	/*
 	 * (non-Javadoc)
diff --git a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/ClusterSummaryView.java b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/ClusterSummaryView.java
index 40b0491d..e022e949 100644
--- a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/ClusterSummaryView.java
+++ b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/ClusterSummaryView.java
@@ -47,6 +47,8 @@ import com.gluster.storage.management.client.GlusterServersClient;
 import com.gluster.storage.management.core.constants.GlusterConstants;
 import com.gluster.storage.management.core.model.Alert;
 import com.gluster.storage.management.core.model.Cluster;
+import com.gluster.storage.management.core.model.ClusterListener;
+import com.gluster.storage.management.core.model.DefaultClusterListener;
 import com.gluster.storage.management.core.model.EntityGroup;
 import com.gluster.storage.management.core.model.GlusterDataModel;
 import com.gluster.storage.management.core.model.GlusterServer;
@@ -74,7 +76,11 @@ public class ClusterSummaryView extends ViewPart {
 	private final FormToolkit toolkit = new FormToolkit(Display.getCurrent());
 	private ScrolledForm form;
 	private Cluster cluster;
+	private Composite cpuChartSection;
+	private Composite networkChartSection;
 	private GlusterDataModel model = GlusterDataModelManager.getInstance().getModel();
+	private ClusterListener clusterListener;
+	private static final IPreferenceStore preferenceStore = Activator.getDefault().getPreferenceStore();
 	private static final int CHART_WIDTH = 350;
 
 	/*
@@ -89,6 +95,28 @@ public class ClusterSummaryView extends ViewPart {
 		}
 		setPartName("Summary");
 		createSections(parent);
+		
+		clusterListener = new DefaultClusterListener() {
+			@Override
+			public void aggregatedStatsChanged() {
+				super.aggregatedStatsChanged();
+				refreshCharts();
+			}
+		};
+		GlusterDataModelManager.getInstance().addClusterListener(clusterListener);
+	}
+	
+	@Override
+	public void dispose() {
+		super.dispose();
+		GlusterDataModelManager.getInstance().removeClusterListener(clusterListener);
+	}
+	
+	private void refreshCharts() {
+		String cpuStatsPeriod = preferenceStore.getString(PreferenceConstants.P_CPU_CHART_PERIOD);
+		String networkStatsPeriod = preferenceStore.getString(PreferenceConstants.P_NETWORK_CHART_PERIOD);
+		refreshChartSection(cpuChartSection, cluster.getAggregatedCpuStats(), cpuStatsPeriod, "%", 100, 4, new CpuChartPeriodLinkListener(cpuStatsPeriod));
+		refreshChartSection(networkChartSection, cluster.getAggregatedNetworkStats(), networkStatsPeriod, "KiB/s", -1, 4, new NetworkChartPeriodLinkListener(networkStatsPeriod));
 	}
 
 	private int getServerCountByStatus(Cluster cluster, SERVER_STATUS status) {
@@ -145,6 +173,7 @@ public class ClusterSummaryView extends ViewPart {
 		protected String statsPeriod;
 		protected String unit;
 		protected int columnCount;
+		protected double maxValue;
 
 		public String getStatsPeriod() {
 			return this.statsPeriod;
@@ -154,10 +183,11 @@ public class ClusterSummaryView extends ViewPart {
 			this.statsPeriod = statsPeriod;
 		}
 		
-		public ChartPeriodLinkListener(String statsPeriod, String unit, int columnCount) {
+		public ChartPeriodLinkListener(String statsPeriod, String unit, double maxValue, int columnCount) {
 			this.statsPeriod = statsPeriod;
 			this.unit = unit;
 			this.columnCount = columnCount;
+			this.maxValue = maxValue;
 		}
 		
 		@Override
@@ -165,16 +195,8 @@ public class ClusterSummaryView extends ViewPart {
 			super.linkActivated(e);
 			//GlusterDataModelManager.getInstance().initializeAlerts(cluster);
 			Composite section = ((Hyperlink)e.getSource()).getParent().getParent();
-			for(Control control : section.getChildren()) {
-				control.dispose();
-			}
-			List<Calendar> timestamps = new ArrayList<Calendar>();
-			List<Double> data = new ArrayList<Double>();
 			ServerStats stats = fetchStats();
-			extractChartData(stats, timestamps, data, 2);
-			createAreaChart(section, timestamps.toArray(new Calendar[0]), data.toArray(new Double[0]), unit, getTimestampFormatForPeriod(statsPeriod));
-			createChartLinks(section, columnCount, this);
-			section.layout();
+			refreshChartSection(section, stats, statsPeriod, unit, maxValue, columnCount, this);
 		}
 		
 		public abstract ChartPeriodLinkListener getInstance(String statsPeriod);
@@ -187,8 +209,8 @@ public class ClusterSummaryView extends ViewPart {
 			super(statsPeriod);
 		}
 		
-		private CpuChartPeriodLinkListener(String statsPeriod, String unit, int columnCount) {
-			super(statsPeriod, unit, columnCount);
+		private CpuChartPeriodLinkListener(String statsPeriod, String unit, double maxValue, int columnCount) {
+			super(statsPeriod, unit, maxValue, columnCount);
 		}
 
 		@Override
@@ -200,7 +222,7 @@ public class ClusterSummaryView extends ViewPart {
 
 		@Override
 		public ChartPeriodLinkListener getInstance(String statsPeriod) {
-			return new CpuChartPeriodLinkListener(statsPeriod, "%", 4);
+			return new CpuChartPeriodLinkListener(statsPeriod, "%", 100, 4);
 		}
 	}
 	
@@ -209,8 +231,8 @@ public class ClusterSummaryView extends ViewPart {
 			super(statsPeriod);
 		}
 		
-		private NetworkChartPeriodLinkListener(String statsPeriod, String unit, int columnCount) {
-			super(statsPeriod, unit, columnCount);
+		private NetworkChartPeriodLinkListener(String statsPeriod, String unit, double maxValue, int columnCount) {
+			super(statsPeriod, unit, maxValue, columnCount);
 		}
 
 		@Override
@@ -222,7 +244,7 @@ public class ClusterSummaryView extends ViewPart {
 
 		@Override
 		public ChartPeriodLinkListener getInstance(String statsPeriod) {
-			return new NetworkChartPeriodLinkListener(statsPeriod, "KiB/s", 4);
+			return new NetworkChartPeriodLinkListener(statsPeriod, "KiB/s", -1d, 4);
 		}
 	}
 
@@ -253,8 +275,8 @@ public class ClusterSummaryView extends ViewPart {
 		}
 	}
 
-	private ChartViewerComposite createAreaChart(Composite section, Calendar timestamps[], Double values[], String unit, String timestampFormat) {
-		ChartViewerComposite chartViewerComposite = new ChartViewerComposite(section, SWT.NONE, timestamps, values, unit, timestampFormat);
+	private ChartViewerComposite createAreaChart(Composite section, Calendar timestamps[], Double values[], String unit, String timestampFormat, double maxValue) {
+		ChartViewerComposite chartViewerComposite = new ChartViewerComposite(section, SWT.NONE, timestamps, values, unit, timestampFormat, maxValue);
 		GridData data = new GridData(SWT.FILL, SWT.FILL, false, false);
 		data.widthHint = CHART_WIDTH;
 		data.heightHint = 250;
@@ -345,7 +367,7 @@ public class ClusterSummaryView extends ViewPart {
 		parent.layout(); // IMP: lays out the form properly
 	}
 
-	private void createAreaChartSection(ServerStats stats, String sectionTitle, int dataColumnIndex, String unit, String timestampFormat, ChartPeriodLinkListener listener) {
+	private Composite createAreaChartSection(ServerStats stats, String sectionTitle, int dataColumnIndex, String unit, String timestampFormat, ChartPeriodLinkListener listener, double maxValue) {
 		Composite section = guiHelper.createSection(form, toolkit, sectionTitle, null, 1, false);
 		
 		List<Calendar> timestamps = new ArrayList<Calendar>();
@@ -353,17 +375,22 @@ public class ClusterSummaryView extends ViewPart {
 		
 		if (cluster.getServers().size() == 0) {
 			toolkit.createLabel(section, "This section will be populated after at least\none server is added to the storage cloud.");
-			return;
+			return null;
+		}
+		
+		if(stats == null) {
+			toolkit.createLabel(section, "Server statistics not available. Try after some time!");
+			return null;
 		}
 		
 		extractChartData(stats, timestamps, data, dataColumnIndex);
 		
 		if(timestamps.size() == 0) {
 			toolkit.createLabel(section, "Server statistics not available!\n Check if all services are running properly on the cluster servers.");
-			return;
+			return null;
 		}
 
-		createAreaChart(section, timestamps.toArray(new Calendar[0]), data.toArray(new Double[0]), unit, timestampFormat);
+		createAreaChart(section, timestamps.toArray(new Calendar[0]), data.toArray(new Double[0]), unit, timestampFormat, maxValue);
 
 //		Calendar[] timestamps = new Calendar[] { new CDateTime(1000l*1310468100), new CDateTime(1000l*1310468400), new CDateTime(1000l*1310468700),
 //				new CDateTime(1000l*1310469000), new CDateTime(1000l*1310469300), new CDateTime(1000l*1310469600), new CDateTime(1000l*1310469900),
@@ -375,6 +402,7 @@ public class ClusterSummaryView extends ViewPart {
 //		Double[] values = new Double[] { 10d, 11.23d, 17.92d, 18.69d, 78.62d, 89.11d, 92.43d, 89.31d, 57.39d, 18.46d, 10.44d, 16.28d, 13.51d, 17.53d, 12.21, 20d, 21.43d, 16.45d, 14.86d, 15.27d };
 //		createLineChart(section, timestamps, values, "%");
 		createChartLinks(section, 4, listener);
+		return section;
 	}
 
 	private void createCPUUsageSection() {
@@ -382,7 +410,7 @@ public class ClusterSummaryView extends ViewPart {
 		String cpuStatsPeriod = preferenceStore.getString(PreferenceConstants.P_CPU_CHART_PERIOD);
 		
 		// in case of CPU usage, there are three elements in usage data: user, system and total. we use total.
-		createAreaChartSection(cluster.getAggregatedCpuStats(), "CPU Usage (Aggregated)", 2, "%", getTimestampFormatForPeriod(cpuStatsPeriod), new CpuChartPeriodLinkListener(cpuStatsPeriod));
+		cpuChartSection = createAreaChartSection(cluster.getAggregatedCpuStats(), "CPU Usage (Aggregated)", 2, "%", getTimestampFormatForPeriod(cpuStatsPeriod), new CpuChartPeriodLinkListener(cpuStatsPeriod), 100);
 	}
 
 	private String getTimestampFormatForPeriod(String statsPeriod) {
@@ -410,7 +438,7 @@ public class ClusterSummaryView extends ViewPart {
 		String networkStatsPeriod = preferenceStore.getString(PreferenceConstants.P_NETWORK_CHART_PERIOD);
 		
 		// in case of network usage, there are three elements in usage data: received, transmitted and total. we use total.
-		createAreaChartSection(cluster.getAggregatedNetworkStats(), "Network Usage (Aggregated)", 2, "KiB/s", getTimestampFormatForPeriod(networkStatsPeriod), new NetworkChartPeriodLinkListener(networkStatsPeriod));
+		networkChartSection = createAreaChartSection(cluster.getAggregatedNetworkStats(), "Network Usage (Aggregated)", 2, "KiB/s", getTimestampFormatForPeriod(networkStatsPeriod), new NetworkChartPeriodLinkListener(networkStatsPeriod), -1);
 	}
 
 	private void createRunningTasksSection() {
@@ -453,4 +481,18 @@ public class ClusterSummaryView extends ViewPart {
 			form.setFocus();
 		}
 	}
+
+	private void refreshChartSection(Composite section, ServerStats stats, String statsPeriod, String unit, double maxValue, int columnCount, ChartPeriodLinkListener linkListener) {
+		for(Control control : section.getChildren()) {
+			if(! control.isDisposed()) {
+				control.dispose();
+			}
+		}
+		List<Calendar> timestamps = new ArrayList<Calendar>();
+		List<Double> data = new ArrayList<Double>();
+		extractChartData(stats, timestamps, data, 2);
+		createAreaChart(section, timestamps.toArray(new Calendar[0]), data.toArray(new Double[0]), unit, getTimestampFormatForPeriod(statsPeriod), maxValue);
+		createChartLinks(section, columnCount, linkListener);
+		section.layout();
+	}
 }
diff --git a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/GlusterServerSummaryView.java b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/GlusterServerSummaryView.java
index e7ef1648..492b51f3 100644
--- a/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/GlusterServerSummaryView.java
+++ b/src/com.gluster.storage.management.gui/src/com/gluster/storage/management/gui/views/GlusterServerSummaryView.java
@@ -116,7 +116,7 @@ public class GlusterServerSummaryView extends ViewPart {
 	}
 
 	private void createAreaChart(Composite section, Calendar timestamps[], Double values[], String unit) {
-		ChartViewerComposite chartViewerComposite = new ChartViewerComposite(section, SWT.NONE, timestamps, values, unit, "HH:mm");
+		ChartViewerComposite chartViewerComposite = new ChartViewerComposite(section, SWT.NONE, timestamps, values, unit, "HH:mm", 100);
 		GridData data = new GridData(SWT.FILL, SWT.FILL, false, false);
 		data.widthHint = CHART_WIDTH;
 		data.heightHint = 250;
diff --git a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/GlusterExceptionMapper.java b/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/GlusterExceptionMapper.java
deleted file mode 100644
index 99089eb7..00000000
--- a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/GlusterExceptionMapper.java
+++ /dev/null
@@ -1,39 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2011 Gluster, Inc. <http://www.gluster.com>
- * This file is part of Gluster Management Console.
- *
- * Gluster Management Console is free software; you can redistribute it and/or 
- * modify it under the terms of the GNU Affero General Public License as published
- * by the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *  
- * Gluster Management Console is distributed in the hope that it will be useful, 
- * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License
- * for more details.
- *  
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see
- * <http://www.gnu.org/licenses/>.
- *******************************************************************************/
-package com.gluster.storage.management.server.resources.v1_0;
-
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-import javax.ws.rs.ext.ExceptionMapper;
-import javax.ws.rs.ext.Provider;
-
-import com.gluster.storage.management.core.exceptions.GlusterRuntimeException;
-
-@Provider
-public class GlusterExceptionMapper implements ExceptionMapper<GlusterRuntimeException> {
-
-	/* (non-Javadoc)
-	 * @see javax.ws.rs.ext.ExceptionMapper#toResponse(java.lang.Throwable)
-	 */
-	@Override
-	public Response toResponse(GlusterRuntimeException exception) {
-		return Response.status(Response.Status.INTERNAL_SERVER_ERROR).entity(exception.getMessage())
-				.type(MediaType.TEXT_PLAIN).build();
-	}
-}
diff --git a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/GlusterServersResource.java b/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/GlusterServersResource.java
index 1b2bb41e..9693ace9 100644
--- a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/GlusterServersResource.java
+++ b/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/GlusterServersResource.java
@@ -522,6 +522,14 @@ public class GlusterServersResource extends AbstractServersResource {
 		if (clusterName == null || clusterName.isEmpty()) {
 			throw new GlusterValidationException("Cluster name must not be empty!");
 		}
+		
+		if (type == null || type.isEmpty()) {
+			throw new GlusterValidationException("Statistics type name must not be empty!");
+		}
+
+		if (period == null || period.isEmpty()) {
+			throw new GlusterValidationException("Statistics period name must not be empty! Valid values are 1d/1w/1m/1y");
+		}
 
 		ClusterInfo cluster = clusterService.getCluster(clusterName);
 		if (cluster == null) {
@@ -541,9 +549,19 @@ public class GlusterServersResource extends AbstractServersResource {
 		if (clusterName == null || clusterName.isEmpty()) {
 			throw new GlusterValidationException("Cluster name must not be empty!");
 		}
+		
 		if (serverName == null || serverName.isEmpty()) {
 			throw new GlusterValidationException("Server name must not be empty!");
 		}
+
+		if (type == null || type.isEmpty()) {
+			throw new GlusterValidationException("Statistics type name must not be empty!");
+		}
+
+		if (period == null || period.isEmpty()) {
+			throw new GlusterValidationException("Statistics period name must not be empty! Valid values are 1d/1w/1m/1y");
+		}
+
 		return okResponse(getStatsFactory(type).fetchStats(serverName, period, networkInterface), mediaType);
 	}
 	
diff --git a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/ValidationExceptionMapper.java b/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/ValidationExceptionMapper.java
deleted file mode 100644
index cab6cc62..00000000
--- a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/resources/v1_0/ValidationExceptionMapper.java
+++ /dev/null
@@ -1,39 +0,0 @@
-/*******************************************************************************
- * Copyright (c) 2011 Gluster, Inc. <http://www.gluster.com>
- * This file is part of Gluster Management Console.
- *
- * Gluster Management Console is free software; you can redistribute it and/or 
- * modify it under the terms of the GNU Affero General Public License as published
- * by the Free Software Foundation; either version 3 of the License, or
- * (at your option) any later version.
- *  
- * Gluster Management Console is distributed in the hope that it will be useful, 
- * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
- * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Affero General Public License
- * for more details.
- *  
- * You should have received a copy of the GNU Affero General Public License
- * along with this program. If not, see
- * <http://www.gnu.org/licenses/>.
- *******************************************************************************/
-package com.gluster.storage.management.server.resources.v1_0;
-
-import javax.ws.rs.core.MediaType;
-import javax.ws.rs.core.Response;
-import javax.ws.rs.ext.ExceptionMapper;
-import javax.ws.rs.ext.Provider;
-
-import com.gluster.storage.management.core.exceptions.GlusterValidationException;
-
-@Provider
-public class ValidationExceptionMapper implements ExceptionMapper<GlusterValidationException> {
-
-	/* (non-Javadoc)
-	 * @see javax.ws.rs.ext.ExceptionMapper#toResponse(java.lang.Throwable)
-	 */
-	@Override
-	public Response toResponse(GlusterValidationException exception) {
-		return Response.status(Response.Status.BAD_REQUEST).entity(exception.getMessage())
-				.type(MediaType.TEXT_PLAIN).build();
-	}
-}
diff --git a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/utils/NetworkStatsFactory.java b/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/utils/NetworkStatsFactory.java
index 96bb0c65..2a50d598 100644
--- a/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/utils/NetworkStatsFactory.java
+++ b/src/com.gluster.storage.management.server/src/com/gluster/storage/management/server/utils/NetworkStatsFactory.java
@@ -27,6 +27,7 @@ import com.gluster.storage.management.core.exceptions.GlusterRuntimeException;
 import com.gluster.storage.management.core.model.NetworkInterface;
 import com.gluster.storage.management.core.model.Server;
 import com.gluster.storage.management.core.model.ServerStats;
+import com.gluster.storage.management.core.model.ServerStatsRow;
 
 /**
  *
@@ -102,4 +103,21 @@ public class NetworkStatsFactory extends AbstractStatsFactory {
 		
 		averageAggregatedStats(aggregatedStats, dataCount);
 	}
+	
+	@Override
+	public ServerStats fetchStats(String serverName, String period, String... args) {
+		ServerStats stats = super.fetchStats(serverName, period, args);
+
+		// the data returned by rrd contains "bytes" transferred in the given time step. Update the stats object to represent KiB/s
+		int step = stats.getMetadata().getStep();
+		for(ServerStatsRow row : stats.getRows()) {
+			List<Double> data = row.getUsageData();
+			for (int i = 0; i < data.size(); i++) {
+				Double val = data.get(i);
+				data.set(i, val / 1024 / step);
+			}
+		}
+		
+		return stats;
+	}
 }