Java tutorial
/* * Copyright 2010-2011 Amazon.com, Inc. or its affiliates. All Rights Reserved. * * Licensed under the Apache License, Version 2.0 (the "License"). * You may not use this file except in compliance with the License. * A copy of the License is located at * * http://aws.amazon.com/apache2.0 * * or in the "license" file accompanying this file. This file is distributed * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either * express or implied. See the License for the specific language governing * permissions and limitations under the License. */ package com.amazonaws.eclipse.elasticbeanstalk.server.ui.configEditor; import java.util.ArrayList; import java.util.List; 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.IMenuListener; import org.eclipse.jface.action.IMenuManager; import org.eclipse.jface.action.MenuManager; import org.eclipse.jface.layout.TreeColumnLayout; import org.eclipse.jface.resource.ImageDescriptor; import org.eclipse.jface.viewers.ColumnWeightData; 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.Viewer; import org.eclipse.swt.SWT; import org.eclipse.swt.dnd.Clipboard; import org.eclipse.swt.dnd.TextTransfer; import org.eclipse.swt.dnd.Transfer; import org.eclipse.swt.graphics.Image; import org.eclipse.swt.layout.FillLayout; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.Tree; import org.eclipse.swt.widgets.TreeColumn; import org.eclipse.swt.widgets.TreeItem; import org.eclipse.ui.ISharedImages; import org.eclipse.ui.PlatformUI; import org.eclipse.ui.forms.widgets.FormToolkit; import org.eclipse.ui.forms.widgets.Section; import org.eclipse.wst.server.ui.editor.ServerEditorSection; import com.amazonaws.eclipse.core.AwsToolkitCore; import com.amazonaws.eclipse.elasticbeanstalk.ElasticBeanstalkPlugin; import com.amazonaws.eclipse.elasticbeanstalk.Environment; import com.amazonaws.services.elasticbeanstalk.AWSElasticBeanstalk; import com.amazonaws.services.elasticbeanstalk.model.DescribeEventsRequest; import com.amazonaws.services.elasticbeanstalk.model.EventDescription; import com.amazonaws.services.elasticbeanstalk.model.EventSeverity; /** * Editor part which displays the event log. */ public class EventLogEditorSection extends ServerEditorSection { /** The section widget we're managing */ private Section section; private FormToolkit toolkit; private TreeViewer viewer; private boolean tableDataLoaded = false; private static final Object JOB_FAMILY = new Object(); @Override public void createSection(Composite parent) { super.createSection(parent); toolkit = getFormToolkit(parent.getDisplay()); section = toolkit.createSection(parent, Section.TITLE_BAR | Section.DESCRIPTION); section.setText("Environment Events"); section.setDescription("Events recorded to your Elastic Beanstalk environment"); Composite composite = toolkit.createComposite(section); FillLayout layout = new FillLayout(); layout.marginHeight = 10; layout.marginWidth = 10; layout.type = SWT.VERTICAL; composite.setLayout(layout); toolkit.paintBordersFor(composite); section.setClient(composite); section.setLayout(layout); createEventsTable(composite); refresh(); } protected TreeColumn newColumn(String columnText, int weight) { Tree table = viewer.getTree(); TreeColumn column = new TreeColumn(table, SWT.NONE); column.setText(columnText); TreeColumnLayout tableColumnLayout = (TreeColumnLayout) viewer.getTree().getParent().getLayout(); if (tableColumnLayout == null) tableColumnLayout = new TreeColumnLayout(); tableColumnLayout.setColumnData(column, new ColumnWeightData(weight)); return column; } /** Populates the Event Log context menu with actions. */ private final class EventLogMenuListener implements IMenuListener { private Action copyToClipboardAction = new Action("Copy to Clipboard") { @Override public ImageDescriptor getImageDescriptor() { return ElasticBeanstalkPlugin.getDefault().getImageRegistry() .getDescriptor(ElasticBeanstalkPlugin.IMG_CLIPBOARD); } @Override public void run() { final Clipboard clipboard = new Clipboard(Display.getDefault()); String eventText = ""; for (TreeItem treeItem : viewer.getTree().getSelection()) { if (eventText == null) eventText = treeItem.getData().toString(); else eventText += "\n" + treeItem.getData().toString(); } TextTransfer textTransfer = TextTransfer.getInstance(); clipboard.setContents(new Object[] { eventText }, new Transfer[] { textTransfer }); } }; public void menuAboutToShow(IMenuManager manager) { TreeItem[] selection = viewer.getTree().getSelection(); copyToClipboardAction.setEnabled(selection != null && selection.length > 0); manager.add(copyToClipboardAction); } } private class LoadEnvironmentEventsJob extends Job { private final Environment environment; public LoadEnvironmentEventsJob(Environment environment) { super("Loading events for environment " + environment.getEnvironmentName()); this.environment = environment; this.setSystem(true); } @Override protected IStatus run(IProgressMonitor monitor) { AWSElasticBeanstalk client = AwsToolkitCore.getClientFactory(environment.getAccountId()) .getElasticBeanstalkClientByEndpoint(environment.getRegionEndpoint()); final List<EventDescription> events = client .describeEvents( new DescribeEventsRequest().withEnvironmentName(environment.getEnvironmentName())) .getEvents(); Display.getDefault().syncExec(new Runnable() { public void run() { // Preserve the current column widths int[] colWidth = new int[viewer.getTree().getColumns().length]; int i = 0; for (TreeColumn col : viewer.getTree().getColumns()) { colWidth[i++] = col.getWidth(); } viewer.setInput(events); // If this is the first time loading the table data, don't // set the column widths -- this will make them zero on // windows. if (tableDataLoaded) { i = 0; for (TreeColumn col : viewer.getTree().getColumns()) { col.setWidth(colWidth[i++]); } } else { tableDataLoaded = true; } } }); return Status.OK_STATUS; } @Override public boolean belongsTo(Object family) { return family == JOB_FAMILY; } } private void addContextMenu() { MenuManager menuManager = new MenuManager("#PopupMenu"); menuManager.setRemoveAllWhenShown(true); menuManager.addMenuListener(new EventLogMenuListener()); Menu menu = menuManager.createContextMenu(viewer.getControl()); viewer.getControl().setMenu(menu); } private void createEventsTable(Composite parent) { Composite composite = new Composite(parent, SWT.NONE); TreeColumnLayout treeColumnLayout = new TreeColumnLayout(); composite.setLayout(treeColumnLayout); int style = SWT.H_SCROLL | SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.BORDER | SWT.MULTI; viewer = new TreeViewer(composite, style); viewer.getTree().setLinesVisible(true); viewer.getTree().setHeaderVisible(true); addContextMenu(); newColumn("Message", 75); newColumn("Version", 10); newColumn("Date", 15); viewer.setContentProvider(new ITreeContentProvider() { private List<EventDescription> events; @SuppressWarnings("unchecked") public void inputChanged(Viewer viewer, Object oldInput, Object newInput) { if (newInput == null) events = new ArrayList<EventDescription>(); else events = (List<EventDescription>) newInput; } public void dispose() { } public Object[] getElements(Object inputElement) { return events.toArray(); } public Object[] getChildren(Object parentElement) { return new Object[0]; } public Object getParent(Object element) { return null; } public boolean hasChildren(Object element) { return false; } }); 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) { EventDescription event = (EventDescription) element; switch (columnIndex) { case 0: return event.getMessage(); case 1: return event.getVersionLabel(); case 2: return event.getEventDate().toString(); default: return ""; } } public Image getColumnImage(Object element, int columnIndex) { if (element == null) return null; if (columnIndex != 0) return null; EventSeverity eventSeverity = null; try { EventDescription event = (EventDescription) element; eventSeverity = EventSeverity.fromValue(event.getSeverity()); } catch (IllegalArgumentException e) { return null; } switch (eventSeverity) { case ERROR: case FATAL: return PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_ERROR_TSK); case WARN: return PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_WARN_TSK); case INFO: case DEBUG: case TRACE: return PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_INFO_TSK); } return null; } }); } /** * Refreshes the events in the table. */ void refresh() { /* * There's a race condition here, but the consequences are trivial. */ if (Job.getJobManager().find(JOB_FAMILY).length == 0) { Environment environment = (Environment) server.loadAdapter(Environment.class, null); new LoadEnvironmentEventsJob(environment).schedule(); } } }