stevedlawrence commented on a change in pull request #273: WIP: Add User Defined Functions Capability URL: https://github.com/apache/incubator-daffodil/pull/273#discussion_r331499959
########## File path: daffodil-runtime1/src/main/java/org/apache/daffodil/udf/UDFunctionService.java ########## @@ -0,0 +1,137 @@ +/* + * 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.daffodil.udf; + +import java.util.Arrays; +import java.util.List; +import java.util.ServiceConfigurationError; +import java.io.Serializable; +import java.util.ArrayList; +import java.util.HashMap; +import java.util.ServiceLoader; +import java.util.stream.Collectors; + +import org.apache.daffodil.util.Misc; + +public class UDFunctionService { + private ServiceLoader<UDFunctionProvider> loader; + private ArrayList<Class<?>> functionClasses = new ArrayList<>(); + private HashMap<String, UDFunctionProvider> functionProviderLookup = new HashMap<>(); + private ArrayList<String> errors = new ArrayList<>(); + private ArrayList<String> warnings = new ArrayList<>(); + + public UDFunctionService(ClassLoader cl) { + try { + loader = cl == null ? ServiceLoader.load(UDFunctionProvider.class) : ServiceLoader.load(UDFunctionProvider.class, cl); + + loader.forEach(fcp -> { + Class<?>[] fcpfc = fcp.getFunctionClasses(); + + if (fcpfc == null || fcpfc.length == 0) { + warnings.add(String.format("Provider ignored: [%s].\nNo Function Classes found.", + fcp.getClass().getName())); + return; + } + + List<Class<?>> fc = Arrays.asList(fcpfc); + + List<Class<?>> missingAnnotations = fc.stream() + .filter(f -> !f.isAnnotationPresent(FunctionClassInfo.class)).collect(Collectors.toList()); + + List<Class<?>> nonSerializables = fc.stream().filter(f -> Serializable.class.isAssignableFrom(f)) + .collect(Collectors.toList()); + + if (!missingAnnotations.isEmpty()) { + warnings.add( + String.format("Provider ignored: [%s].\nAnnotations missing for FunctionClass(es):\n%s", + fcp.getClass().getName(), missingAnnotations.stream().map(c -> c.getName()) + .collect(Collectors.joining("\n", "\t[", "]")))); + return; + } + + if (!nonSerializables.isEmpty()) { + warnings.add(String.format( + "Provider ignored: [%s].\nFunctionClass(es) must implement java.io.Serializable:\n%s", + fcp.getClass().getName(), nonSerializables.stream().map(c -> c.getName()) + .collect(Collectors.joining("\n", "\t[", "]")))); + return; + } + + fc.stream().forEach(f -> { + FunctionClassInfo fInfo = f.getAnnotation(FunctionClassInfo.class); + String ns = fInfo.namespace(); + String fname = fInfo.name(); + if (ns.isEmpty() || fname.isEmpty() || ns.matches("\\s+") || fname.matches("\\s+")) { + warnings.add(String.format("FunctionClass ignored: [%s]. From Provider [%s].%s%s", f.getName(), fcp.getClass().getName(), + ns.isEmpty() ? "\nAnnotation namespace field is empty or invalid." : "", + fname.isEmpty() ? "\nAnnotation name field is empty or invalid." : "")); + } + + String key = String.join("_", fInfo.namespace(), fInfo.name()); + if (functionProviderLookup.containsKey(key)) { + warnings.add(String.format( + "FunctionClass ignored: [%s].\nDuplicate name [%s] and namespace[%s] found.", + f.getName(), key.split("_")[0], key.split("_")[1])); + } else { + functionProviderLookup.put(key, fcp); + functionClasses.add(f); + } + }); + }); + + if (functionClasses.isEmpty()) { + errors.add(String.format("No user defined functions found." Review comment: This doesn't feel like an error to me. It's perfetly reasonable to have no UDF's on the classes path. If a we come across a function that isn't a built-in and there are no UDF's, then the error is just that this function is not supported--not necessarily that we found no udfs. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
