drccrd commented on code in PR #4032: URL: https://github.com/apache/incubator-kie-tools/pull/4032#discussion_r4166637603
########## packages/drools-lsp/drools-lsp-server/src/main/java/org/drools/lsp/server/ProjectEngine.java: ########## @@ -0,0 +1,216 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License 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 org.drools.lsp.server; + +import java.io.IOException; +import java.io.InputStream; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; +import java.net.MalformedURLException; +import java.net.URL; +import java.net.URLClassLoader; +import java.nio.file.Path; +import java.util.ArrayList; +import java.util.Collection; +import java.util.LinkedHashSet; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.concurrent.atomic.AtomicReference; +import java.util.logging.Level; +import java.util.logging.Logger; + +/** + * The project's own Drools engine, driven through the bridge class. + * + * <p>The project loader sees the project's classpath and the platform classes + * only. The server's loader is deliberately not its parent: the server jar + * carries a DRL parser and an ANTLR runtime of its own, and the project's + * versions must win inside the engine. The bridge class is defined from this + * server's own jar into a child of the project loader, so its references to + * kie-api resolve against the project. + */ +final class ProjectEngine implements Engine { + + static final String BRIDGE_CLASS = "org.drools.lsp.bridge.EngineBridge"; + static final String COMPILER_CLASS = "org.drools.compiler.kie.builder.impl.KieServicesImpl"; + static final String MVEL_CLASS = "org.drools.mvel.MVELConstraint"; + private static final String BRIDGE_PACKAGE_PREFIX = "org.drools.lsp.bridge."; + private static final Logger logger = Logger.getLogger(ProjectEngine.class.getName()); + + private final Set<Path> entries; + private final URLClassLoader projectLoader; + private final Class<?> bridge; + private final Method build; + private volatile boolean closed; + + private ProjectEngine(Set<Path> entries, URLClassLoader projectLoader, Class<?> bridge, Method build) { + this.entries = entries; + this.projectLoader = projectLoader; + this.bridge = bridge; + this.build = build; + } + + static ProjectEngine over(Collection<Path> classpathEntries) { + Set<Path> entries = new LinkedHashSet<>(classpathEntries); + List<URL> urls = new ArrayList<>(entries.size()); + for (Path entry : entries) { + try { + urls.add(entry.toUri().toURL()); + } catch (MalformedURLException e) { + logger.fine(() -> "Skipping classpath entry " + entry + ": " + e.getMessage()); + } + } + URLClassLoader projectLoader = new URLClassLoader("drools-lsp-project", + urls.toArray(new URL[0]), ClassLoader.getPlatformClassLoader()); + Class<?> bridge = null; + Method build = null; + if (hasCompiler(projectLoader)) { + try { + bridge = Class.forName(BRIDGE_CLASS, true, new BridgeClassLoader(projectLoader)); + build = bridge.getMethod("build", Map.class); + } catch (ReflectiveOperationException | LinkageError e) { + logger.log(Level.WARNING, "A Drools engine is on the project classpath but the compile bridge did not link", e); + } + } + ProjectEngine engine = new ProjectEngine(entries, projectLoader, bridge, build); + if (build == null) { + // Permanently unavailable: release the loader's open jar handles now + // rather than holding them until the next classpath change replaces it. + engine.close(); + } + return engine; + } + + Set<Path> entries() { + return entries; + } + + @Override + public boolean available() { + return build != null && !closed; + } + + @Override + public List<Map<String, Object>> build(Map<String, String> drlByPath) throws Exception { + if (!available()) { + throw new IllegalStateException("No Drools engine available"); + } + AtomicReference<Object> outcome = new AtomicReference<>(); + Thread worker = new Thread(() -> { + Thread.currentThread().setContextClassLoader(bridge.getClassLoader()); + try { + outcome.set(build.invoke(null, drlByPath)); + } catch (Throwable t) { + outcome.set(t); + } + }, "drools-lsp-engine-build"); + worker.setDaemon(true); + worker.start(); + worker.join(); + Object result = outcome.get(); + if (result instanceof InvocationTargetException e) { + Throwable cause = e.getCause(); + if (cause instanceof Exception exception) { + throw exception; + } + throw e; + } + if (result instanceof Exception e) { + throw e; + } + if (result instanceof Error e) { + throw e; + } + @SuppressWarnings("unchecked") + List<Map<String, Object>> messages = (List<Map<String, Object>>) result; + return messages; + } + + @Override + public void close() { + closed = true; + try { + projectLoader.close(); + } catch (IOException e) { + logger.log(Level.FINE, "Closing the project class loader failed", e); + } + } + + boolean isClosed() { + return closed; + } + + Class<?> bridgeClassForTest() { + return bridge; + } + + ClassLoader projectLoaderForTest() { + return projectLoader; + } + + private static boolean hasCompiler(ClassLoader projectLoader) { + try { + Class.forName("org.kie.api.KieServices", false, projectLoader); + } catch (ClassNotFoundException e) { + logger.fine("No Drools engine on the project classpath; compile diagnostics stay off until it changes"); + return false; + } + try { + Class.forName(COMPILER_CLASS, false, projectLoader); + } catch (ClassNotFoundException e) { + logger.fine("kie-api is on the project classpath but drools-compiler is not; compile diagnostics stay off until it changes"); + return false; + } + try { + Class.forName(MVEL_CLASS, false, projectLoader); + } catch (ClassNotFoundException e) { + logger.fine("drools-compiler is on the project classpath but drools-mvel is not; the classic build cannot " + + "compile constraints, compile diagnostics stay off until it changes"); + return false; + } + return true; + } Review Comment: Covered the further error types with a warning about missing classpath -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
