added sorting of projects for initial classpath update event to speed up initial experience

eclipse-language-servers/org.springframework.tooling.ls.eclipse.commons/META-INF/MANIFEST.MF

@@ -15,7 +15,8 @@ Require-Bundle: org.eclipse.jdt.launching;bundle-version="3.8.0",
  com.google.guava,
  org.eclipse.debug.ui,
  org.eclipse.ui.console,
- org.springframework.tooling.jdt.ls.commons
+ org.springframework.tooling.jdt.ls.commons,
+ org.eclipse.ui.ide
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Bundle-ActivationPolicy: lazy
 Export-Package: org.springframework.tooling.ls.eclipse.commons,

eclipse-language-servers/org.springframework.tooling.ls.eclipse.commons/src/org/springframework/tooling/ls/eclipse/commons/ProjectSorter.java

@@ -0,0 +1,86 @@
+/*******************************************************************************
+ * Copyright (c) 2018 Pivotal, Inc.
+ * 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:
+ *     Pivotal, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.springframework.tooling.ls.eclipse.commons;
+
+import java.util.Comparator;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.ui.IEditorInput;
+import org.eclipse.ui.IEditorPart;
+import org.eclipse.ui.IEditorReference;
+import org.eclipse.ui.IWorkbenchPage;
+import org.eclipse.ui.PartInitException;
+import org.eclipse.ui.PlatformUI;
+import org.eclipse.ui.part.FileEditorInput;
+
+public class ProjectSorter implements Comparator<IProject> {
+
+	private IProject activeProject;
+	private Set<IProject> projectsWithEditors;
+
+	public ProjectSorter() {
+
+		this.projectsWithEditors = new HashSet<IProject>();
+
+		PlatformUI.getWorkbench().getDisplay().syncExec(new Runnable() {
+			@Override
+			public void run() {
+				IEditorPart activeEditor = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getActivePage().getActiveEditor();
+				IEditorInput editorInput = activeEditor.getEditorInput();
+				activeProject = getProject(editorInput);
+
+				IWorkbenchPage[] pages = PlatformUI.getWorkbench().getActiveWorkbenchWindow().getPages();
+				for (IWorkbenchPage page : pages) {
+					IEditorReference[] references = page.getEditorReferences();
+					for (IEditorReference editorReference : references) {
+						try {
+							IEditorInput additionalInput = editorReference.getEditorInput();
+							IProject additionalProject = getProject(additionalInput);
+
+							if (additionalProject != null && additionalProject != activeProject) {
+								projectsWithEditors.add(additionalProject);
+							}
+						} catch (PartInitException e) {
+							// ignore this editor
+						}
+					}
+				}
+			}
+		});
+	}
+
+	private IProject getProject(IEditorInput editorInput) {
+		if (editorInput != null && editorInput instanceof FileEditorInput) {
+			FileEditorInput fileInput = (FileEditorInput) editorInput;
+			return fileInput.getFile() != null ? fileInput.getFile().getProject() : null;
+		}
+		else {
+			return null;
+		}
+	}
+
+	@Override
+	public int compare(IProject o1, IProject o2) {
+		return score(o2) - score(o1);
+	}
+
+	private int score(IProject project) {
+		if (project == null) return 0;
+
+		if (project == activeProject) return 10;
+		if (projectsWithEditors.contains(project)) return 5;
+
+		return 0;
+	}
+
+}

eclipse-language-servers/org.springframework.tooling.ls.eclipse.commons/src/org/springframework/tooling/ls/eclipse/commons/STS4LanguageClientImpl.java

@@ -50,9 +50,10 @@ import com.google.common.collect.ImmutableMap;
 @SuppressWarnings("restriction")
 public class STS4LanguageClientImpl extends LanguageClientImpl implements STS4LanguageClient {
 
-	private static ReusableClasspathListenerHandler classpathService = new ReusableClasspathListenerHandler(
+	private static ReusableClasspathListenerHandler classpathService = new ReusableClasspathListenerHandler (
 			Logger.forEclipsePlugin(LanguageServerCommonsActivator::getInstance),
-			new LSP4ECommandExecutor()
+			new LSP4ECommandExecutor(),
+			() -> new ProjectSorter()
 	);
 
 	public STS4LanguageClientImpl() {