| /* |
| * 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.jclouds.byon.functions; |
| |
| import static com.google.common.base.Preconditions.checkState; |
| import static com.google.common.base.Throwables.propagate; |
| import static org.jclouds.util.Closeables2.closeQuietly; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.List; |
| import java.util.Map; |
| |
| import javax.inject.Singleton; |
| |
| import org.jclouds.byon.Node; |
| import org.jclouds.byon.domain.YamlNode; |
| import org.yaml.snakeyaml.LoaderOptions; |
| import org.yaml.snakeyaml.TypeDescription; |
| import org.yaml.snakeyaml.Yaml; |
| import org.yaml.snakeyaml.constructor.Constructor; |
| |
| import com.google.common.base.Function; |
| import com.google.common.base.Functions; |
| import com.google.common.cache.CacheBuilder; |
| import com.google.common.cache.CacheLoader; |
| import com.google.common.cache.LoadingCache; |
| import com.google.common.collect.Iterables; |
| import com.google.common.collect.Maps; |
| import com.google.common.io.ByteSource; |
| |
| /** |
| * Parses the following syntax. |
| * |
| * <pre> |
| * nodes: |
| * - id: cluster-1: |
| * name: cluster-1 |
| * description: xyz |
| * hostname: cluster-1.mydomain.com |
| * location_id: virginia |
| * os_arch: x86 |
| * os_family: linux |
| * os_description: redhat |
| * os_version: 5.3 |
| * group: hadoop |
| * tags: |
| * - vanilla |
| * username: kelvin |
| * credential: password_or_rsa |
| * or |
| * credential_url: password_or_rsa_file ex. resource:///id_rsa will get the classpath /id_rsa; file://path/to/id_rsa |
| * sudo_password: password |
| * </pre> |
| */ |
| @Singleton |
| public class NodesFromYamlStream implements Function<ByteSource, LoadingCache<String, Node>> { |
| |
| /** |
| * Type-safe config class for YAML |
| * |
| */ |
| public static class Config { |
| public List<YamlNode> nodes; |
| } |
| |
| @Override |
| public LoadingCache<String, Node> apply(ByteSource source) { |
| |
| Constructor constructor = new Constructor(Config.class, new LoaderOptions()); |
| |
| TypeDescription nodeDesc = new TypeDescription(YamlNode.class); |
| nodeDesc.putListPropertyType("tags", String.class); |
| constructor.addTypeDescription(nodeDesc); |
| |
| TypeDescription configDesc = new TypeDescription(Config.class); |
| configDesc.putListPropertyType("nodes", YamlNode.class); |
| constructor.addTypeDescription(configDesc); |
| Yaml yaml = new Yaml(constructor); |
| Config config; |
| InputStream in = null; |
| try { |
| in = source.openStream(); |
| config = (Config) yaml.load(in); |
| } catch (IOException ioe) { |
| throw propagate(ioe); |
| } finally { |
| closeQuietly(in); |
| } |
| checkState(config != null, "missing config: class"); |
| checkState(config.nodes != null, "missing nodes: collection"); |
| |
| Map<String, Node> backingMap = Maps.uniqueIndex(Iterables.transform(config.nodes, YamlNode.toNode), |
| new Function<Node, String>() { |
| public String apply(Node node) { |
| return node.getId(); |
| } |
| }); |
| LoadingCache<String, Node> cache = CacheBuilder.newBuilder().build(CacheLoader.from(Functions.forMap(backingMap))); |
| for (String node : backingMap.keySet()) |
| cache.getUnchecked(node); |
| return cache; |
| } |
| } |