raducotescu commented on a change in pull request #1: SLING-7134 - Script execution order is not deterministic on Java 9 URL: https://github.com/apache/sling-org-apache-sling-scripting-core/pull/1#discussion_r154532142
########## File path: src/main/java/org/apache/sling/scripting/core/impl/jsr223/SlingScriptEngineManager.java ########## @@ -0,0 +1,320 @@ +/*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + ~ 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.apache.sling.scripting.core.impl.jsr223; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.net.URL; +import java.nio.charset.StandardCharsets; +import java.util.ArrayList; +import java.util.Collections; +import java.util.Dictionary; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Hashtable; +import java.util.List; +import java.util.Map; +import java.util.Set; +import java.util.SortedSet; +import java.util.TreeSet; +import java.util.concurrent.locks.ReentrantReadWriteLock; + +import javax.script.ScriptEngine; +import javax.script.ScriptEngineFactory; +import javax.script.ScriptEngineManager; + +import org.apache.sling.api.scripting.SlingScriptConstants; +import org.apache.sling.commons.osgi.PropertiesUtil; +import org.osgi.framework.Bundle; +import org.osgi.framework.BundleEvent; +import org.osgi.framework.BundleListener; +import org.osgi.framework.Constants; +import org.osgi.framework.ServiceReference; +import org.osgi.service.component.ComponentContext; +import org.osgi.service.component.annotations.Activate; +import org.osgi.service.component.annotations.Component; +import org.osgi.service.component.annotations.Reference; +import org.osgi.service.component.annotations.ReferenceCardinality; +import org.osgi.service.component.annotations.ReferencePolicy; +import org.osgi.service.component.annotations.ReferencePolicyOption; +import org.osgi.service.event.Event; +import org.osgi.service.event.EventAdmin; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +@Component( + service = {ScriptEngineManager.class, SlingScriptEngineManager.class}, + reference = @Reference( + name = "ScriptEngineFactory", + bind = "bindScriptEngineFactory", + unbind = "unbindScriptEngineFactory", + service = ScriptEngineFactory.class, + cardinality = ReferenceCardinality.MULTIPLE, + policy = ReferencePolicy.DYNAMIC + ) +) +public class SlingScriptEngineManager extends ScriptEngineManager implements BundleListener { + + public static final String EVENT_TOPIC_SCRIPT_MANAGER_UPDATED = + "org/apache/sling/scripting/core/impl/jsr223/SlingScriptEngineManager/UPDATED"; + public static final String ENGINE_FACTORY_SERVICE = "META-INF/services/" + ScriptEngineFactory.class.getName(); + + private static final Logger LOG = LoggerFactory.getLogger(SlingScriptEngineManager.class); + + private final Set<Bundle> engineSpiBundles = new HashSet<>(); + private final ReentrantReadWriteLock readWriteLock = new ReentrantReadWriteLock(); + private final Map<ScriptEngineFactory, Map<String, Object>> factoriesProperties = new HashMap<>(); + private final Set<ServiceReference<ScriptEngineFactory>> serviceReferences = new HashSet<>(); + + private ScriptEngineManager internalManager = new ScriptEngineManager(SlingScriptEngineManager.class.getClassLoader()); + private SortedSet<SortableScriptEngineFactory> factories = new TreeSet<>(); + private ComponentContext componentContext; + + @Reference(policy = ReferencePolicy.DYNAMIC, + policyOption = ReferencePolicyOption.GREEDY, + cardinality = ReferenceCardinality.OPTIONAL) + private volatile EventAdmin eventAdmin; + + @Override + public ScriptEngine getEngineByName(String shortName) { + readWriteLock.readLock().lock(); + try { + return internalManager.getEngineByName(shortName); + } finally { + readWriteLock.readLock().unlock(); + } + } + + @Override + public ScriptEngine getEngineByExtension(String extension) { + readWriteLock.readLock().lock(); + try { + return internalManager.getEngineByExtension(extension); + } finally { + readWriteLock.readLock().unlock(); + } + } + + @Override + public ScriptEngine getEngineByMimeType(String mimeType) { + readWriteLock.readLock().lock(); + try { + return internalManager.getEngineByMimeType(mimeType); + } finally { + readWriteLock.readLock().unlock(); + } + } + + @Override + public List<ScriptEngineFactory> getEngineFactories() { + readWriteLock.readLock().lock(); + try { + ArrayList<ScriptEngineFactory> list = new ArrayList<>(factories.size()); + list.addAll(factories); + return Collections.unmodifiableList(list); + } finally { + readWriteLock.readLock().unlock(); + } + } + + @Override + public void registerEngineName(String name, ScriptEngineFactory factory) { + readWriteLock.writeLock().lock(); + try { + internalManager.registerEngineName(name, factory); + } finally { + readWriteLock.writeLock().unlock(); + } + } + + @Override + public void registerEngineMimeType(String type, ScriptEngineFactory factory) { + readWriteLock.writeLock().lock(); + try { + internalManager.registerEngineMimeType(type, factory); + } finally { + readWriteLock.writeLock().unlock(); + } + } + + @Override + public void registerEngineExtension(String extension, ScriptEngineFactory factory) { + readWriteLock.writeLock().lock(); + try { + internalManager.registerEngineExtension(extension, factory); + } finally { + readWriteLock.writeLock().unlock(); + } + } + + @Override + public void bundleChanged(BundleEvent event) { + if (event.getType() == BundleEvent.STARTED + && event.getBundle().getEntry(ENGINE_FACTORY_SERVICE) != null) { + synchronized (this.engineSpiBundles) { + this.engineSpiBundles.add(event.getBundle()); + } + updateFactories(); + } else if (event.getType() == BundleEvent.STOPPED) { + boolean refresh; + synchronized (this.engineSpiBundles) { + refresh = this.engineSpiBundles.remove(event.getBundle()); + } + if (refresh) { + updateFactories(); + } + } + } + + public Map<String, Object> getProperties(ScriptEngineFactory factory) { + readWriteLock.readLock().lock(); + try { + return factoriesProperties.get(factory); + } finally { + readWriteLock.readLock().unlock(); + } + } + + @Activate + private void activate(ComponentContext componentContext) { + this.componentContext = componentContext; + updateFactories(); + } + + private void bindScriptEngineFactory(final ServiceReference<ScriptEngineFactory> serviceReference, + final ScriptEngineFactory factory) { + synchronized (this.serviceReferences) { + serviceReferences.add(serviceReference); + } + updateFactories(); + postEvent(SlingScriptConstants.TOPIC_SCRIPT_ENGINE_FACTORY_ADDED, factory); + } + + private void unbindScriptEngineFactory(final ServiceReference<ScriptEngineFactory> serviceReference, final ScriptEngineFactory + factory) { + synchronized (this.serviceReferences) { + serviceReferences.remove(serviceReference); + if (componentContext != null) { + componentContext.getBundleContext().ungetService(serviceReference); + } + } + updateFactories(); + postEvent(SlingScriptConstants.TOPIC_SCRIPT_ENGINE_FACTORY_REMOVED, factory); + } + + private void updateFactories() { + readWriteLock.writeLock().lock(); + try { + factories = new TreeSet<>(); + internalManager = new ScriptEngineManager(SlingScriptEngineManager.class.getClassLoader()); + long fakeBundleIdCounter = Long.MIN_VALUE; + // first add the platform factories + for (ScriptEngineFactory factory : internalManager.getEngineFactories()) { + SortableScriptEngineFactory ssef = new SortableScriptEngineFactory(factory, fakeBundleIdCounter++, 0); + factories.add(ssef); + } + // then factories from SPI Bundles + for (Bundle bundle : engineSpiBundles) { + URL url = bundle.getEntry(ENGINE_FACTORY_SERVICE); Review comment: We probably could - feel free to push a commit changing the code. :) I didn't want to change more code than needed - this method is copied from the old `ScriptEngineManagerFactory` (https://github.com/apache/sling-org-apache-sling-scripting-core/pull/1/files#diff-592cfbf344b2569e240757d7fb09e125L119). ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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