| /* |
| * 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.yarn; |
| |
| import org.apache.reef.util.HadoopEnvironment; |
| |
| import javax.annotation.concurrent.NotThreadSafe; |
| import java.util.ArrayList; |
| import java.util.Collections; |
| import java.util.LinkedHashSet; |
| import java.util.List; |
| |
| /** |
| * A helper class to assemble a class path. |
| * <p> |
| * It uses a TreeSet internally for both a prefix and a suffix of the classpath. This makes sure that duplicate entries |
| * are avoided. |
| */ |
| @NotThreadSafe |
| final class ClassPathBuilder { |
| private final LinkedHashSet<String> prefix = new LinkedHashSet<>(); |
| private final LinkedHashSet<String> suffix = new LinkedHashSet<>(); |
| |
| /** |
| * The oracle that tells us whether a given path could be a YARN configuration path. |
| * |
| * @param path |
| * @return |
| */ |
| private static boolean couldBeYarnConfigurationPath(final String path) { |
| return path.contains("conf") || |
| path.contains("etc") || |
| path.contains(HadoopEnvironment.HADOOP_CONF_DIR); |
| } |
| |
| /** |
| * Adds the given classpath entry. A guess will be made whether it refers to a configuration folder, in which case |
| * it will be added to the prefix. Else, it will be added to the suffix. |
| * |
| * @param classPathEntry |
| */ |
| void add(final String classPathEntry) { |
| // Make sure that the cluster configuration is in front of user classes |
| if (couldBeYarnConfigurationPath(classPathEntry)) { |
| this.addToPrefix(classPathEntry); |
| } else { |
| this.addToSuffix(classPathEntry); |
| } |
| } |
| |
| /** |
| * Adds the given classPathEntry to the classpath suffix. |
| * |
| * @param classPathEntry |
| */ |
| void addToSuffix(final String classPathEntry) { |
| this.suffix.add(classPathEntry); |
| } |
| |
| /** |
| * Adds the given classPathEntry to the classpath prefix. |
| * |
| * @param classPathEntry |
| */ |
| void addToPrefix(final String classPathEntry) { |
| this.prefix.add(classPathEntry); |
| } |
| |
| /** |
| * Adds all entries given using the <code>add()</code> method. |
| * |
| * @param entries |
| */ |
| void addAll(final String... entries) { |
| for (final String classPathEntry : entries) { |
| this.add(classPathEntry); |
| } |
| } |
| |
| /** |
| * Adds all the given entries to the classpath suffix. |
| * |
| * @param entries |
| */ |
| void addAllToSuffix(final String... entries) { |
| for (final String classPathEntry : entries) { |
| this.addToSuffix(classPathEntry); |
| } |
| } |
| |
| |
| /** |
| * @return the suffix in an immutable list. |
| */ |
| List<String> getSuffixAsImmutableList() { |
| return Collections.unmodifiableList(new ArrayList<>(this.suffix)); |
| } |
| |
| /** |
| * @return the prefix in an immutable list. |
| */ |
| List<String> getPrefixAsImmutableList() { |
| return Collections.unmodifiableList(new ArrayList<>(this.prefix)); |
| } |
| } |