| /* |
| * 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.beam.runners.fnexecution.artifact; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| /** |
| * An {@link ArtifactRetrievalService} that loads artifacts as {@link ClassLoader} resources. |
| * |
| * <p>The retrieval token should be a path to a JSON-formatted ProxyManifest accessible via {@link |
| * ClassLoader#getResource(String)} whose resource locations also point to paths loadable via {@link |
| * ClassLoader#getResource(String)}. |
| */ |
| public class ClassLoaderArtifactRetrievalService extends AbstractArtifactRetrievalService { |
| |
| private final ClassLoader classLoader; |
| |
| public ClassLoaderArtifactRetrievalService() { |
| this(ClassLoaderArtifactRetrievalService.class.getClassLoader()); |
| } |
| |
| public ClassLoaderArtifactRetrievalService(ClassLoader classLoader) { |
| this.classLoader = classLoader; |
| } |
| |
| @Override |
| public InputStream openManifest(String retrievalToken) throws IOException { |
| return openUri(retrievalToken, retrievalToken); |
| } |
| |
| @Override |
| public InputStream openUri(String retrievalToken, String uri) throws IOException { |
| if (uri.charAt(0) == '/') { |
| uri = uri.substring(1); |
| } |
| InputStream result = classLoader.getResourceAsStream(uri); |
| if (result == null) { |
| throw new IOException("Unable to load " + uri + " with " + classLoader); |
| } |
| return result; |
| } |
| } |