Added JDT command for getting Java project

Also added a JDT Project cache in the Spring Boot LS

vscode-extensions/commons-vscode/src/launch-util.ts

@@ -15,7 +15,8 @@ import {HighlightService, HighlightParams} from './highlight-service';
 import { log } from 'util';
 import { tmpdir } from 'os';
 import { JVM, findJvm, findJdk } from '@pivotal-tools/jvm-launch-utils';
-import { registerClasspathService } from './classpath';
+import { registerClasspathService } from './classpath-service';
+import { registerProjectService } from './project-service';
 
 let p2c = P2C.createConverter();
 
@@ -215,6 +216,7 @@ function setupLanguageClient(context: VSCode.ExtensionContext, createServer: Ser
             }
             return { applied: true};
         });
+        registerProjectService(client);
         registerClasspathService(client);
         return client;
     });

vscode-extensions/commons-vscode/src/project-service.ts

@@ -0,0 +1,22 @@
+'use strict';
+
+
+import * as VSCode from 'vscode';
+import { LanguageClient, RequestType } from 'vscode-languageclient';
+
+export function registerProjectService(client : LanguageClient) : void {
+    let projectRequest = new RequestType<string, ProjectResponse, void, void>("sts/project");
+
+    client.onRequest(projectRequest, async (uri: string) => {
+        return await executeProjectCommand(uri);
+    });
+}
+
+async function executeProjectCommand(resourceUri : string) : Promise<ProjectResponse> {
+    return <ProjectResponse> (await VSCode.commands.executeCommand("java.execute.workspaceCommand", "sts.java.resolveProject", resourceUri));
+}
+
+interface ProjectResponse {
+    name: string,
+    uri : string
+}