initial prototype of build troubleshooting view

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>

17 files changed, 732 insertions, 1 deletions

diff --git a/org.eclipse.m2e.core.ui/icons/clear.gif b/org.eclipse.m2e.core.ui/icons/clear.gif
new file mode 100644
index 00000000..2cd9c544
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/icons/clear.gif
diff --git a/org.eclipse.m2e.core.ui/icons/suspend.gif b/org.eclipse.m2e.core.ui/icons/suspend.gif
new file mode 100644
index 00000000..161e3f59
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/icons/suspend.gif
diff --git a/org.eclipse.m2e.core.ui/plugin.properties b/org.eclipse.m2e.core.ui/plugin.properties
index bc485714..a3a5a5d8 100644
--- a/org.eclipse.m2e.core.ui/plugin.properties
+++ b/org.eclipse.m2e.core.ui/plugin.properties
@@ -94,6 +94,7 @@ action.addplugin.label = Add Maven Plugin
 action.add.plugin.tooltip = Add Maven Plugin
 category.maven.name = Maven
 view.repos.name = Maven Repositories
+view.build.name = Maven Workspace Build
 page.maven.name = Maven
 page.mappings.name = Lifecycle Mapping
 lifecycleMapping.custom.name = Customizable Lifecycle Mapping
diff --git a/org.eclipse.m2e.core.ui/plugin.xml b/org.eclipse.m2e.core.ui/plugin.xml
index 117f86be..965e5522 100644
--- a/org.eclipse.m2e.core.ui/plugin.xml
+++ b/org.eclipse.m2e.core.ui/plugin.xml
@@ -485,6 +485,14 @@
             class="org.eclipse.m2e.core.ui.internal.views.MavenRepositoryView"
             icon="icons/maven_indexes.gif"
             name="%view.repos.name"/>
+      <view
+            allowMultiple="false"
+            category="org.eclipse.m2e.core.views.repositories"
+            class="org.eclipse.m2e.core.ui.internal.views.build.BuildDebugView"
+            id="org.eclipse.m2e.core.views.MavenBuild"
+            name="%view.build.name"
+            restorable="true">
+      </view>
    </extension>
 
    <extension point="org.eclipse.ui.bindings">
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/MavenImages.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/MavenImages.java
index 2452ae70..43a2a1cc 100644
--- a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/MavenImages.java
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/MavenImages.java
@@ -54,6 +54,10 @@ public class MavenImages {
 
   public static final ImageDescriptor COLLAPSEALL = createDescriptor("collapseall.gif"); //$NON-NLS-1$
 
+  public static final ImageDescriptor SUSPEND = createDescriptor("suspend.gif"); //$NON-NLS-1$
+
+  public static final ImageDescriptor CLEAR = createDescriptor("clear.gif"); //$NON-NLS-1$
+
   // object images
   public static final String PATH_JAR = "jar_obj.gif"; //$NON-NLS-1$
 
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/Messages.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/Messages.java
index aded9ac4..7f72ea38 100644
--- a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/Messages.java
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/Messages.java
@@ -863,6 +863,24 @@ public class Messages extends NLS {
 
   public static String LifecycleMappingPreferencePage_this_message;
 
+  public static String BuildDebugView_columnName;
+
+  public static String BuildDebugView_columnBuildNumber;
+
+  public static String BuildDebugView_nodeExecutions;
+
+  public static String BuildDebugView_nodeDelta;
+
+  public static String BuildDebugView_actionSuspend;
+
+  public static String BuildDebugView_actionClear;
+
+  public static String BuildDebugView_actionCollapseAll;
+
+  public static String BuildDebugView_errorTitle;
+
+  public static String BuildDebugView_errorDescription;
+
   static {
     // initialize resource bundle
     NLS.initializeMessages(BUNDLE_NAME, Messages.class);
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/messages.properties b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/messages.properties
index b56d9fbb..c01d6abf 100644
--- a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/messages.properties
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/messages.properties
@@ -431,3 +431,15 @@ wizardProjectPageProjectTitle=New Maven project
 wizardProjectPageProjectValidatorInvalidLocation=Invalid project location path
 wizardProjectPageProjectValidatorProjectLocation=Enter a location for the project.
 wizardProjectTitle=New Maven Project
+BuildDebugView_columnName=Name
+BuildDebugView_columnBuildNumber=Build#
+BuildDebugView_nodeExecutions=executions
+BuildDebugView_nodeDelta=delta
+BuildDebugView_actionSuspend=Suspend
+BuildDebugView_actionClear=Clear
+BuildDebugView_actionCollapseAll=Collapse All
+BuildDebugView_errorTitle=Build debug error
+BuildDebugView_errorDescription=Could not collection build log
+
+
+
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/BuildDebugView.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/BuildDebugView.java
new file mode 100644
index 00000000..81265573
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/BuildDebugView.java
@@ -0,0 +1,325 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.ui.internal.views.build;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IFolder;
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResource;
+import org.eclipse.core.resources.IResourceDelta;
+import org.eclipse.core.resources.IResourceDeltaVisitor;
+import org.eclipse.core.runtime.CoreException;
+import org.eclipse.core.runtime.IProgressMonitor;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.core.runtime.jobs.Job;
+import org.eclipse.jface.action.Action;
+import org.eclipse.jface.action.IAction;
+import org.eclipse.jface.action.IToolBarManager;
+import org.eclipse.jface.dialogs.ErrorDialog;
+import org.eclipse.jface.viewers.ILabelProviderListener;
+import org.eclipse.jface.viewers.ITableLabelProvider;
+import org.eclipse.jface.viewers.ITreeContentProvider;
+import org.eclipse.jface.viewers.TreeViewer;
+import org.eclipse.jface.viewers.TreeViewerColumn;
+import org.eclipse.jface.viewers.Viewer;
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.widgets.Composite;
+import org.eclipse.swt.widgets.Tree;
+import org.eclipse.swt.widgets.TreeColumn;
+import org.eclipse.ui.IActionBars;
+import org.eclipse.ui.IViewSite;
+import org.eclipse.ui.PartInitException;
+import org.eclipse.ui.part.ViewPart;
+
+import org.eclipse.m2e.core.internal.builder.BuildDebugHook;
+import org.eclipse.m2e.core.internal.builder.MavenBuilder;
+import org.eclipse.m2e.core.project.IMavenProjectFacade;
+import org.eclipse.m2e.core.project.configurator.AbstractBuildParticipant;
+import org.eclipse.m2e.core.project.configurator.MojoExecutionKey;
+import org.eclipse.m2e.core.ui.internal.MavenImages;
+import org.eclipse.m2e.core.ui.internal.Messages;
+
+
+@SuppressWarnings("restriction")
+public class BuildDebugView extends ViewPart implements BuildDebugHook {
+
+  /*package*/static final Comparator<Node> NODE_COMPARATOR = new Comparator<Node>() {
+    public int compare(Node p1, Node p2) {
+      int d = p2.getBuildCount() - p1.getBuildCount();
+      if(d != 0) {
+        return d;
+      }
+      return p1.getName().compareTo(p2.getName());
+    }
+  };
+
+  /*package*/TreeViewer viewer;
+
+  /*package*/final Object projectsLock = new Object() {
+  };
+
+  /*package*/final Map<String, ProjectNode> projects = new ConcurrentHashMap<String, ProjectNode>();
+
+  /*package*/final Job refreshJob = new Job("") {
+    protected IStatus run(IProgressMonitor monitor) {
+      getSite().getShell().getDisplay().asyncExec(new Runnable() {
+        public void run() {
+          viewer.refresh();
+//          for(TreeColumn column : viewer.getTree().getColumns()) {
+//            column.pack();
+//          }
+        }
+      });
+      return Status.OK_STATUS;
+    }
+  };
+
+  /*package*/volatile boolean suspended = true;
+
+  public void createPartControl(Composite parent) {
+    viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL);
+    Tree tree = viewer.getTree();
+    tree.setHeaderVisible(true);
+    tree.setLinesVisible(true);
+
+    TreeViewerColumn treeViewerColumn = new TreeViewerColumn(viewer, SWT.NONE);
+    TreeColumn trclmnName = treeViewerColumn.getColumn();
+    trclmnName.setWidth(400);
+    trclmnName.setText(Messages.BuildDebugView_columnName);
+
+    TreeViewerColumn treeViewerColumn_1 = new TreeViewerColumn(viewer, SWT.NONE);
+    TreeColumn trclmnBuildCount = treeViewerColumn_1.getColumn();
+    trclmnBuildCount.setWidth(100);
+    trclmnBuildCount.setText(Messages.BuildDebugView_columnBuildNumber);
+    viewer.setLabelProvider(new ITableLabelProvider() {
+
+      public void removeListener(ILabelProviderListener listener) {
+      }
+
+      public boolean isLabelProperty(Object element, String property) {
+        return false;
+      }
+
+      public void dispose() {
+      }
+
+      public void addListener(ILabelProviderListener listener) {
+      }
+
+      public String getColumnText(Object element, int columnIndex) {
+        if(element instanceof Node) {
+          return getColumnText((Node) element, columnIndex);
+        }
+
+        if(columnIndex == 0) {
+          return element.toString();
+        }
+
+        return null;
+      }
+
+      private String getColumnText(Node element, int columnIndex) {
+        switch(columnIndex) {
+          case 0:
+            return element.getName();
+          case 1:
+            return Integer.toString(element.getBuildCount());
+          default:
+            // fall through  
+        }
+        return null;
+      }
+
+      public Image getColumnImage(Object element, int columnIndex) {
+        return null;
+      }
+    });
+
+    viewer.setContentProvider(new ITreeContentProvider() {
+
+      public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+      }
+
+      public void dispose() {
+      }
+
+      public boolean hasChildren(Object element) {
+        if(element instanceof ContainerNode) {
+          return !((ContainerNode) element).getResources().isEmpty();
+        }
+        if(element instanceof CollectionNode<?>) {
+          return !((CollectionNode<?>) element).getMembers().isEmpty();
+        }
+        return false;
+      }
+
+      public Object getParent(Object element) {
+        return null;
+      }
+
+      public Object[] getElements(Object inputElement) {
+        if(inputElement == projects) {
+          List<ProjectNode> sorted;
+          synchronized(projectsLock) {
+            sorted = new ArrayList<ProjectNode>(projects.values());
+          }
+          Collections.sort(sorted, NODE_COMPARATOR);
+          return sorted.toArray();
+        }
+        return new Object[0];
+      }
+
+      public Object[] getChildren(Object parentElement) {
+        if(parentElement instanceof ProjectNode) {
+          ArrayList<Object> result = new ArrayList<Object>();
+
+          final ProjectNode projectNode = (ProjectNode) parentElement;
+
+          final List<ResourceNode> resources = new ArrayList<ResourceNode>(projectNode.getResources());
+          if(!resources.isEmpty()) {
+            Collections.sort(resources, NODE_COMPARATOR);
+            result.add(new CollectionNode<ResourceNode>(Messages.BuildDebugView_nodeDelta, resources));
+          }
+
+          final List<MojoExecutionNode> executions = new ArrayList<MojoExecutionNode>(projectNode.getMojoExecutions());
+          if(!executions.isEmpty()) {
+            Collections.sort(executions, NODE_COMPARATOR);
+            result.add(new CollectionNode<MojoExecutionNode>(Messages.BuildDebugView_nodeExecutions, executions));
+          }
+
+          return result.toArray();
+        } else if(parentElement instanceof CollectionNode<?>) {
+          return ((CollectionNode<?>) parentElement).getMembers().toArray();
+        } else if(parentElement instanceof ContainerNode) {
+          return ((ContainerNode) parentElement).getResources().toArray();
+        }
+        return null;
+      }
+    });
+
+    viewer.setInput(projects);
+
+    IActionBars actionBars = getViewSite().getActionBars();
+    IToolBarManager toolBar = actionBars.getToolBarManager();
+    Action suspendAction = new Action(Messages.BuildDebugView_actionSuspend, IAction.AS_CHECK_BOX) {
+      public void run() {
+        suspended = isChecked();
+      }
+    };
+    suspendAction.setImageDescriptor(MavenImages.SUSPEND);
+    suspendAction.setChecked(suspended);
+    Action clearAction = new Action(Messages.BuildDebugView_actionClear, MavenImages.CLEAR) {
+      public void run() {
+        synchronized(projectsLock) {
+          projects.clear();
+        }
+        refreshJob.schedule();
+      }
+    };
+    Action collapseAll = new Action(Messages.BuildDebugView_actionCollapseAll, MavenImages.COLLAPSEALL) {
+      public void run() {
+        viewer.collapseAll();
+      }
+    };
+    toolBar.add(collapseAll);
+    toolBar.add(clearAction);
+    toolBar.add(suspendAction);
+    actionBars.updateActionBars();
+  }
+
+  public void setFocus() {
+  }
+
+  public void init(IViewSite site) throws PartInitException {
+    super.init(site);
+    MavenBuilder.addDebugHook(this);
+  }
+
+  public void dispose() {
+    MavenBuilder.removeDebugHook(this);
+    super.dispose();
+  }
+
+  public void buildStart(IMavenProjectFacade projectFacade, int kind, Map<String, String> args,
+      Map<MojoExecutionKey, List<AbstractBuildParticipant>> participants, IResourceDelta delta, IProgressMonitor monitor) {
+
+    if(suspended) {
+      return;
+    }
+
+    final ProjectNode projectNode = getProjectNode(projectFacade);
+
+    final int buildCount = projectNode.incrementBuildCount();
+
+    try {
+      if(delta != null) {
+        delta.accept(new IResourceDeltaVisitor() {
+          public boolean visit(IResourceDelta delta) {
+            if(delta.getAffectedChildren().length == 0) {
+              IResource resource = delta.getResource();
+              if(resource instanceof IFile || resource instanceof IFolder) {
+                projectNode.addResource(resource.getProjectRelativePath()).setBuildCount(buildCount);
+              }
+            }
+            return true; // keep visiting
+          }
+        });
+      }
+      refreshJob.schedule(1000L);
+    } catch(CoreException ex) {
+      ErrorDialog.openError(getSite().getShell(), Messages.BuildDebugView_errorTitle,
+          Messages.BuildDebugView_errorDescription, ex.getStatus());
+    }
+  }
+
+  private ProjectNode getProjectNode(IMavenProjectFacade projectFacade) {
+    synchronized(projectsLock) {
+      IProject project = projectFacade.getProject();
+      ProjectNode projectNode = projects.get(project.getName());
+      if(projectNode == null) {
+        projectNode = new ProjectNode(project.getName());
+        projects.put(project.getName(), projectNode);
+      }
+      return projectNode;
+    }
+  }
+
+  public void buildParticipant(IMavenProjectFacade projectFacade, MojoExecutionKey mojoExecutionKey,
+      AbstractBuildParticipant participant, Set<File> files, IProgressMonitor monitor) {
+
+    if(suspended || files == null || files.isEmpty()) {
+      return;
+    }
+
+    final ProjectNode projectNode = getProjectNode(projectFacade);
+    final int buildCount = projectNode.getBuildCount();
+
+    // TODO secondary participants 
+    // ... although they are unlikely to use BuildContext so we don't know what resources they modify
+    final MojoExecutionNode executionNode = projectNode.getMojoExecutionNode(mojoExecutionKey);
+    executionNode.setBuildCount(buildCount);
+    for(File file : files) {
+      executionNode.addResource(projectFacade.getProjectRelativePath(file.getAbsolutePath())).setBuildCount(buildCount);
+    }
+  }
+}
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/CollectionNode.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/CollectionNode.java
new file mode 100644
index 00000000..1244ea81
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/CollectionNode.java
@@ -0,0 +1,45 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.ui.internal.views.build;
+
+import java.util.Collection;
+
+
+class CollectionNode<T extends Node> implements Node {
+
+  private final String name;
+
+  private final Collection<T> members;
+
+  public CollectionNode(String name, Collection<T> members) {
+    this.name = name;
+    this.members = members;
+  }
+
+  public Collection<T> getMembers() {
+    return members;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public int getBuildCount() {
+    int result = 0;
+    for(Node member : members) {
+      if(result < member.getBuildCount()) {
+        result = member.getBuildCount();
+      }
+    }
+    return result;
+  }
+}
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ContainerNode.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ContainerNode.java
new file mode 100644
index 00000000..d84b0546
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ContainerNode.java
@@ -0,0 +1,48 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.ui.internal.views.build;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.eclipse.core.runtime.IPath;
+
+
+abstract class ContainerNode implements Node {
+  private final String name;
+
+  private final Map<IPath, ResourceNode> resources = new HashMap<IPath, ResourceNode>();
+
+  protected ContainerNode(String name) {
+    this.name = name;
+  }
+
+  public String getName() {
+    return name;
+  }
+
+  public synchronized ResourceNode addResource(IPath path) {
+    ResourceNode child = resources.get(path);
+    if(child == null) {
+      child = new ResourceNode(path);
+      resources.put(path, child);
+    }
+    return child;
+  }
+
+  public synchronized Collection<ResourceNode> getResources() {
+    return new ArrayList<ResourceNode>(resources.values());
+  }
+
+}
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/MojoExecutionNode.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/MojoExecutionNode.java
new file mode 100644
index 00000000..64631667
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/MojoExecutionNode.java
@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.ui.internal.views.build;
+
+import org.eclipse.m2e.core.project.configurator.MojoExecutionKey;
+
+
+class MojoExecutionNode extends ContainerNode {
+
+  private final MojoExecutionKey mojoExecutionKey;
+
+  private int buildCount;
+
+  public MojoExecutionNode(MojoExecutionKey mojoExecutionKey) {
+    super(mojoExecutionKey.toString());
+    this.mojoExecutionKey = mojoExecutionKey;
+  }
+
+  public MojoExecutionKey getMojoExecutionKey() {
+    return mojoExecutionKey;
+  }
+
+  public synchronized int getBuildCount() {
+    return buildCount;
+  }
+
+  public void setBuildCount(int buildCount) {
+    this.buildCount = buildCount;
+  }
+}
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/Node.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/Node.java
new file mode 100644
index 00000000..5376433e
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/Node.java
@@ -0,0 +1,19 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.ui.internal.views.build;
+
+interface Node {
+
+  public String getName();
+
+  public int getBuildCount();
+}
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ProjectNode.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ProjectNode.java
new file mode 100644
index 00000000..a5806dbb
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ProjectNode.java
@@ -0,0 +1,53 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.ui.internal.views.build;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.eclipse.m2e.core.project.configurator.MojoExecutionKey;
+
+
+class ProjectNode extends ContainerNode {
+
+  private final Map<MojoExecutionKey, MojoExecutionNode> executions = new HashMap<MojoExecutionKey, MojoExecutionNode>();
+
+  private final AtomicInteger buildCount = new AtomicInteger();
+
+  public ProjectNode(String name) {
+    super(name);
+  }
+
+  public int incrementBuildCount() {
+    return buildCount.incrementAndGet();
+  }
+
+  public int getBuildCount() {
+    return buildCount.get();
+  }
+
+  public synchronized MojoExecutionNode getMojoExecutionNode(MojoExecutionKey mojoExecutionKey) {
+    MojoExecutionNode node = executions.get(mojoExecutionKey);
+    if(node == null) {
+      node = new MojoExecutionNode(mojoExecutionKey);
+      executions.put(mojoExecutionKey, node);
+    }
+    return node;
+  }
+
+  public synchronized Collection<MojoExecutionNode> getMojoExecutions() {
+    return new ArrayList<MojoExecutionNode>(executions.values());
+  }
+}
diff --git a/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ResourceNode.java b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ResourceNode.java
new file mode 100644
index 00000000..21009f6f
--- /dev/null
+++ b/org.eclipse.m2e.core.ui/src/org/eclipse/m2e/core/ui/internal/views/build/ResourceNode.java
@@ -0,0 +1,42 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.ui.internal.views.build;
+
+import org.eclipse.core.runtime.IPath;
+
+
+class ResourceNode implements Node {
+
+  private final IPath path;
+
+  private int buildCount;
+
+  public ResourceNode(IPath path) {
+    this.path = path;
+  }
+
+  public String getName() {
+    return path.toPortableString();
+  }
+
+  public IPath getPath() {
+    return path;
+  }
+
+  public synchronized int getBuildCount() {
+    return buildCount;
+  }
+
+  public void setBuildCount(int buildCount) {
+    this.buildCount = buildCount;
+  }
+}
diff --git a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/BuildDebugHook.java b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/BuildDebugHook.java
new file mode 100644
index 00000000..e81d2cf6
--- /dev/null
+++ b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/BuildDebugHook.java
@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * Copyright (c) 2013 Igor Fedorenko
+ * 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:
+ *      Igor Fedorenko - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.m2e.core.internal.builder;
+
+import java.io.File;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+import org.eclipse.core.resources.IResourceDelta;
+import org.eclipse.core.runtime.IProgressMonitor;
+
+import org.eclipse.m2e.core.project.IMavenProjectFacade;
+import org.eclipse.m2e.core.project.configurator.AbstractBuildParticipant;
+import org.eclipse.m2e.core.project.configurator.MojoExecutionKey;
+
+
+/**
+ * @noreference This internal interface can be changed or removed without notice.
+ * @since 1.4
+ */
+public interface BuildDebugHook {
+
+  public void buildStart(IMavenProjectFacade projectFacade, int kind, Map<String, String> args,
+      Map<MojoExecutionKey, List<AbstractBuildParticipant>> participants, IResourceDelta delta, IProgressMonitor monitor);
+
+  public void buildParticipant(IMavenProjectFacade projectFacade, MojoExecutionKey mojoExecutionKey,
+      AbstractBuildParticipant participant, Set<File> files, IProgressMonitor monitor);
+
+}
diff --git a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilder.java b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilder.java
index ae424ab9..616d2781 100644
--- a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilder.java
+++ b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilder.java
@@ -11,8 +11,11 @@
 
 package org.eclipse.m2e.core.internal.builder;
 
+import java.util.ArrayList;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.List;
+import java.util.ListIterator;
 import java.util.Map;
 import java.util.Set;
 
@@ -204,4 +207,35 @@ public class MavenBuilder extends IncrementalProjectBuilder implements DeltaProv
 
     return projectFacade;
   }
+
+  private static final List<BuildDebugHook> debugHooks = new ArrayList<BuildDebugHook>();
+
+  public static void addDebugHook(BuildDebugHook hook) {
+    synchronized(debugHooks) {
+      for(BuildDebugHook other : debugHooks) {
+        if(other == hook) {
+          return;
+        }
+      }
+      debugHooks.add(hook);
+    }
+  }
+
+  public static void removeDebugHook(BuildDebugHook hook) {
+    synchronized(debugHooks) {
+      ListIterator<BuildDebugHook> iter = debugHooks.listIterator();
+      while(iter.hasNext()) {
+        if(iter.next() == hook) {
+          iter.remove();
+          break;
+        }
+      }
+    }
+  }
+
+  public static Collection<BuildDebugHook> getDebugHooks() {
+    synchronized(debugHooks) {
+      return new ArrayList<BuildDebugHook>(debugHooks);
+    }
+  }
 }
diff --git a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilderImpl.java b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilderImpl.java
index 49907418..91aeee8d 100644
--- a/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilderImpl.java
+++ b/org.eclipse.m2e.core/src/org/eclipse/m2e/core/internal/builder/MavenBuilderImpl.java
@@ -16,10 +16,12 @@ import static org.eclipse.core.resources.IncrementalProjectBuilder.FULL_BUILD;
 import static org.eclipse.core.resources.IncrementalProjectBuilder.INCREMENTAL_BUILD;
 
 import java.io.File;
+import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.LinkedHashMap;
+import java.util.LinkedHashSet;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
@@ -83,6 +85,8 @@ public class MavenBuilderImpl {
   public Set<IProject> build(MavenSession session, IMavenProjectFacade projectFacade, int kind,
       Map<String, String> args, Map<MojoExecutionKey, List<AbstractBuildParticipant>> participants,
       IProgressMonitor monitor) throws CoreException {
+    Collection<BuildDebugHook> debugHooks = MavenBuilder.getDebugHooks();
+
     Set<IProject> dependencies = new HashSet<IProject>();
 
     MavenProject mavenProject = projectFacade.getMavenProject();
@@ -106,13 +110,17 @@ public class MavenBuilderImpl {
       }
     }
 
+    debugBuildStart(debugHooks, projectFacade, kind, args, participants, delta, monitor);
+
     Map<Throwable, MojoExecutionKey> buildErrors = new LinkedHashMap<Throwable, MojoExecutionKey>();
     ThreadBuildContext.setThreadBuildContext(buildContext);
     MavenProjectMutableState snapshot = MavenProjectMutableState.takeSnapshot(mavenProject);
     try {
       for(Entry<MojoExecutionKey, List<AbstractBuildParticipant>> entry : participants.entrySet()) {
+        MojoExecutionKey mojoExecutionKey = entry.getKey();
         for(InternalBuildParticipant participant : entry.getValue()) {
-          MojoExecutionKey mojoExecutionKey = entry.getKey();
+          Set<File> debugRefreshFiles = !debugHooks.isEmpty() ? new LinkedHashSet<File>(buildContext.getFiles()) : null;
+
           log.debug("Executing build participant {} for plugin execution {}", participant.getClass().getName(),
               mojoExecutionKey.toString());
           String stringMojoExecutionKey = mojoExecutionKey.getKeyString();
@@ -149,6 +157,9 @@ public class MavenBuilderImpl {
 
             processMavenSessionErrors(session, mojoExecutionKey, buildErrors);
           }
+
+          debugBuildParticipant(debugHooks, projectFacade, mojoExecutionKey, (AbstractBuildParticipant) participant,
+              diff(debugRefreshFiles, buildContext.getFiles()), monitor);
         }
       }
     } catch(Exception e) {
@@ -164,9 +175,42 @@ public class MavenBuilderImpl {
     // Process errors and warnings
     MavenExecutionResult result = session.getResult();
     processBuildResults(project, mavenProject, result, buildContext, buildErrors);
+
+    debugBuildEnd(debugHooks, projectFacade, buildContext, monitor);
+
     return dependencies;
   }
 
+  private void debugBuildParticipant(Collection<BuildDebugHook> hooks, IMavenProjectFacade projectFacade,
+      MojoExecutionKey mojoExecutionKey, AbstractBuildParticipant participant, Set<File> files, IProgressMonitor monitor) {
+    for(BuildDebugHook hook : hooks) {
+      hook.buildParticipant(projectFacade, mojoExecutionKey, participant, files, monitor);
+    }
+  }
+
+  private Set<File> diff(Set<File> before, Set<File> after) {
+    if(before == null) {
+      return after;
+    }
+    Set<File> result = new LinkedHashSet<File>(after);
+    result.removeAll(before);
+    return result;
+  }
+
+  private void debugBuildStart(Collection<BuildDebugHook> hooks, IMavenProjectFacade projectFacade, int kind,
+      Map<String, String> args, Map<MojoExecutionKey, List<AbstractBuildParticipant>> participants,
+      IResourceDelta delta, IProgressMonitor monitor) {
+    for(BuildDebugHook hook : hooks) {
+      hook.buildStart(projectFacade, kind, args, participants, delta, monitor);
+    }
+  }
+
+  private void debugBuildEnd(Collection<BuildDebugHook> hooks, IMavenProjectFacade projectFacade,
+      AbstractEclipseBuildContext buildContext, IProgressMonitor monitor) {
+    for(BuildDebugHook hook : hooks) {
+    }
+  }
+
   protected boolean isApplicable(InternalBuildParticipant participant, int kind, IResourceDelta delta) {
     return FULL_BUILD == kind || delta != null || participant.callOnEmptyDelta();
   }