| /* |
| * 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.reef.runtime.local; |
| |
| import org.apache.reef.runtime.common.files.RuntimeClasspathProvider; |
| import org.apache.reef.util.Optional; |
| |
| import javax.inject.Inject; |
| import java.io.File; |
| import java.nio.file.Path; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| |
| /** |
| * RuntimeClasspathProvider for the local runtime. |
| * <p> |
| * The prefix for the local runtime is empty, the suffix is the classpath of the current JVM. That classpath is filtered |
| * to not contain subfolders of JAVA_HOME. Also, duplicates are removed. |
| */ |
| public final class LocalClasspathProvider implements RuntimeClasspathProvider { |
| private final List<String> classPathSuffix; |
| |
| @Inject |
| LocalClasspathProvider() { |
| this.classPathSuffix = Collections.unmodifiableList(new ArrayList<>(getFilteredClasspath())); |
| } |
| |
| /** |
| * @return the classpath filtered by entries in subfolders of JAVA_HOME are removed, so are duplicate entries. |
| */ |
| private static LinkedHashSet<String> getFilteredClasspath() { |
| final LinkedHashSet<String> result = new LinkedHashSet<>(); |
| final Optional<Path> javaHome = getJavaHome(); |
| |
| if (javaHome.isPresent()) { |
| final Path javaHomePath = javaHome.get(); |
| for (final Path classPathEntry : getClasspath()) { |
| if (!classPathEntry.startsWith(javaHomePath)) { |
| result.add(toAbsolutePathString(classPathEntry)); |
| } |
| } |
| } else { |
| for (final Path classPathEntry : getClasspath()) { |
| result.add(toAbsolutePathString(classPathEntry)); |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * @return the path to "JAVA_HOME", if that is set. Optional.empty(), else. |
| */ |
| private static Optional<Path> getJavaHome() { |
| final Optional<String> javaHome = getEnv("JAVA_HOME"); |
| |
| if (javaHome.isPresent()) { |
| final File javaHomeFile = new File(javaHome.get()); |
| if (javaHomeFile.exists()) { |
| return Optional.of(javaHomeFile.toPath()); |
| } |
| } |
| return Optional.empty(); |
| } |
| |
| /** |
| * @param envName |
| * @return the value of the environment variable, if there is one. |
| */ |
| private static Optional<String> getEnv(final String envName) { |
| return Optional.ofNullable(System.getenv(envName)); |
| } |
| |
| /** |
| * @return the classpath of the current JVM. Duplicates are removed. |
| */ |
| private static LinkedHashSet<Path> getClasspath() { |
| final LinkedHashSet<Path> result = new LinkedHashSet<>(); |
| for (final String classPathEntry : System.getProperty("java.class.path").split(File.pathSeparator)) { |
| final File file = new File(classPathEntry); |
| if (file.exists()) { |
| result.add(file.toPath()); |
| } |
| } |
| return result; |
| } |
| |
| /** |
| * Concerts the given path into a String representing the absolute path. |
| * |
| * @param path |
| * @return |
| */ |
| private static String toAbsolutePathString(final Path path) { |
| return path.toAbsolutePath().toString(); |
| } |
| |
| @Override |
| public List<String> getDriverClasspathPrefix() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public List<String> getDriverClasspathSuffix() { |
| return this.classPathSuffix; |
| } |
| |
| @Override |
| public List<String> getEvaluatorClasspathPrefix() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public List<String> getEvaluatorClasspathSuffix() { |
| return this.classPathSuffix; |
| } |
| } |