| /* |
| * 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.ambari.server.stack; |
| |
| import java.io.File; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| |
| import org.apache.ambari.server.AmbariException; |
| import org.apache.ambari.server.state.stack.ExtensionMetainfoXml; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| /** |
| * Encapsulates IO operations on a extension definition extension directory. |
| * |
| * An extension version is like a stack version but it contains custom services. Linking an extension |
| * version to the current stack version allows the cluster to install the custom services contained in |
| * the extension version. |
| */ |
| //todo: Normalize all path return values. |
| //todo: Currently some are relative and some are absolute. |
| //todo: Current values were dictated by the ExtensionInfo expectations. |
| public class ExtensionDirectory extends StackDefinitionDirectory { |
| |
| /** |
| * collection of service directories |
| */ |
| private Collection<ServiceDirectory> serviceDirectories; |
| |
| /** |
| * metainfo file representation |
| */ |
| private ExtensionMetainfoXml metaInfoXml; |
| |
| /** |
| * file unmarshaller |
| */ |
| ModuleFileUnmarshaller unmarshaller = new ModuleFileUnmarshaller(); |
| |
| /** |
| * extensions directory name |
| */ |
| public final static String EXTENSIONS_FOLDER_NAME = "extensions"; |
| |
| /** |
| * metainfo file name |
| */ |
| private static final String EXTENSION_METAINFO_FILE_NAME = "metainfo.xml"; |
| |
| /** |
| * logger instance |
| */ |
| private final static Logger LOG = LoggerFactory.getLogger(ExtensionDirectory.class); |
| |
| |
| /** |
| * Constructor. |
| * |
| * @param directory extension directory |
| * @throws AmbariException if unable to parse the stack directory |
| */ |
| public ExtensionDirectory(String directory) throws AmbariException { |
| super(directory); |
| parsePath(); |
| } |
| |
| /** |
| * Obtain the extension directory name. |
| * |
| * @return extension directory name |
| */ |
| public String getExtensionDirName() { |
| return getDirectory().getParentFile().getName(); |
| } |
| |
| /** |
| * Obtain the object representation of the extension metainfo.xml file. |
| * |
| * @return object representation of the extension metainfo.xml file |
| */ |
| public ExtensionMetainfoXml getMetaInfoFile() { |
| return metaInfoXml; |
| } |
| |
| /** |
| * Obtain a collection of all service directories. |
| * |
| * @return collection of all service directories |
| */ |
| public Collection<ServiceDirectory> getServiceDirectories() { |
| return serviceDirectories; |
| } |
| |
| /** |
| * Parse the extension directory. |
| * |
| * @throws AmbariException if unable to parse the directory |
| */ |
| private void parsePath() throws AmbariException { |
| Collection<String> subDirs = Arrays.asList(directory.list()); |
| parseServiceDirectories(subDirs); |
| parseMetaInfoFile(); |
| } |
| |
| /** |
| * Parse the extension metainfo file. |
| * |
| * @throws AmbariException if unable to parse the extension metainfo file |
| */ |
| private void parseMetaInfoFile() throws AmbariException { |
| File extensionMetaInfoFile = new File(getAbsolutePath() |
| + File.separator + EXTENSION_METAINFO_FILE_NAME); |
| |
| //todo: is it ok for this file not to exist? |
| if (extensionMetaInfoFile.exists()) { |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("Reading extension version metainfo from file {}", extensionMetaInfoFile.getAbsolutePath()); |
| } |
| |
| try { |
| metaInfoXml = unmarshaller.unmarshal(ExtensionMetainfoXml.class, extensionMetaInfoFile); |
| } catch (Exception e) { |
| metaInfoXml = new ExtensionMetainfoXml(); |
| metaInfoXml.setValid(false); |
| metaInfoXml.addError("Unable to parse extension metainfo.xml file at location: " + |
| extensionMetaInfoFile.getAbsolutePath()); |
| } |
| } |
| } |
| |
| /** |
| * Parse the extension's service directories extension |
| * @param subDirs extension sub directories |
| * @throws AmbariException if unable to parse the service directories |
| */ |
| private void parseServiceDirectories(Collection<String> subDirs) throws AmbariException { |
| Collection<ServiceDirectory> dirs = new HashSet<>(); |
| |
| if (subDirs.contains(ServiceDirectory.SERVICES_FOLDER_NAME)) { |
| String servicesDir = getAbsolutePath() + File.separator + ServiceDirectory.SERVICES_FOLDER_NAME; |
| File baseServiceDir = new File(servicesDir); |
| File[] serviceFolders = baseServiceDir.listFiles(StackDirectory.FILENAME_FILTER); |
| if (serviceFolders != null) { |
| for (File d : serviceFolders) { |
| if (d.isDirectory()) { |
| try { |
| dirs.add(new StackServiceDirectory(d.getAbsolutePath())); |
| } catch (AmbariException e) { |
| //todo: this seems as though we should propagate this exception |
| //todo: eating it now to keep backwards compatibility |
| LOG.warn(String.format("Unable to parse extension definition service at '%s'. Ignoring service. : %s", |
| d.getAbsolutePath(), e.toString())); |
| } |
| } |
| } |
| } |
| } |
| |
| if (dirs.isEmpty()) { |
| //todo: what does it mean for a extension to have no services? |
| LOG.info("The extension defined at '" + getAbsolutePath() + "' contains no services"); |
| } |
| serviceDirectories = dirs; |
| } |
| } |