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From mattf-horton <...@git.apache.org>
Subject [GitHub] metron pull request #530: METRON-777 Metron Extension System and Parser Exte...
Date Mon, 14 Aug 2017 22:48:47 GMT
Github user mattf-horton commented on a diff in the pull request:

    https://github.com/apache/metron/pull/530#discussion_r133081227
  
    --- Diff: bundles-lib/src/main/java/org/apache/metron/bundles/ExtensionManager.java ---
    @@ -0,0 +1,540 @@
    +/*
    + * 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.metron.bundles;
    +
    +
    +import com.google.common.collect.ImmutableList;
    +import com.google.common.collect.ImmutableMap;
    +import com.google.common.collect.ImmutableSet;
    +import java.util.ArrayList;
    +import java.util.Collections;
    +import java.util.HashMap;
    +import java.util.HashSet;
    +import java.util.List;
    +import java.util.Map;
    +import java.util.Set;
    +import org.apache.commons.vfs2.FileObject;
    +import org.apache.commons.vfs2.FileSystemException;
    +import org.apache.commons.vfs2.FileSystemManager;
    +import org.apache.metron.bundles.bundle.Bundle;
    +import org.apache.metron.bundles.bundle.BundleCoordinates;
    +import org.apache.metron.bundles.bundle.BundleDetails;
    +import org.apache.metron.bundles.util.BundleProperties;
    +import org.apache.metron.bundles.util.DummyFileObject;
    +import org.apache.metron.bundles.util.FileUtils;
    +import org.apache.metron.bundles.util.ImmutableCollectionUtils;
    +import org.apache.metron.bundles.util.StringUtils;
    +import org.apache.metron.bundles.annotation.behavior.RequiresInstanceClassLoading;
    +
    +import org.atteo.classindex.ClassIndex;
    +import org.slf4j.Logger;
    +import org.slf4j.LoggerFactory;
    +
    +import java.io.IOException;
    +import java.lang.reflect.Modifier;
    +import java.net.URI;
    +import java.net.URISyntaxException;
    +import java.net.URL;
    +import java.net.URLClassLoader;
    +import java.util.concurrent.ConcurrentHashMap;
    +
    +/**
    + * A Singleton class for scanning through the classpath to load all extension components
using
    + * the ClassIndex and running through all classloaders (root, BUNDLEs).
    + *
    + *
    + * @ThreadSafe - is immutable
    + */
    +@SuppressWarnings("rawtypes")
    +public class ExtensionManager {
    +
    +  private static volatile ExtensionManager extensionManager;
    +  private volatile InitContext initContext;
    +
    +  private static final Logger logger = LoggerFactory.getLogger(ExtensionManager.class);
    +
    +  public static final BundleCoordinates SYSTEM_BUNDLE_COORDINATE = new BundleCoordinates(
    +      BundleCoordinates.DEFAULT_GROUP, "system", BundleCoordinates.DEFAULT_VERSION);
    +
    +  private static final class InitContext {
    +
    +    // Maps a service definition (interface) to those classes that implement the interface
    +    private final Map<Class, Set<Class>> definitionMap;
    +    private final Map<String, List<Bundle>> classNameBundleLookup;
    +    private final Map<BundleCoordinates, Bundle> bundleCoordinateBundleLookup;
    +    private final Map<ClassLoader, Bundle> classLoaderBundleLookup;
    +    private final Set<String> requiresInstanceClassLoading;
    +    private final Map<String, ClassLoader> instanceClassloaderLookup;
    +
    +    private InitContext(Map<Class, Set<Class>> definitionMap,
    +        Map<String, List<Bundle>> classNameBundleLookup,
    +        Map<BundleCoordinates, Bundle> bundleCoordinateBundleLookup,
    +        Map<ClassLoader, Bundle> classLoaderBundleLookup,
    +        Set<String> requiresInstanceClassLoading,
    +        Map<String, ClassLoader> instanceClassloaderLookup) {
    +
    +      this.definitionMap = ImmutableCollectionUtils.immutableMapOfSets(definitionMap);
    +      this.classNameBundleLookup = ImmutableCollectionUtils
    +          .immutableMapOfLists(classNameBundleLookup);
    +      this.bundleCoordinateBundleLookup = ImmutableMap.copyOf(bundleCoordinateBundleLookup);
    +      this.classLoaderBundleLookup = ImmutableMap.copyOf(classLoaderBundleLookup);
    +      this.requiresInstanceClassLoading = ImmutableSet.copyOf(requiresInstanceClassLoading);
    +      this.instanceClassloaderLookup = new ConcurrentHashMap<>(instanceClassloaderLookup);
    +    }
    --- End diff --
    
    Ok


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