| /* |
| * 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.drill.common.config; |
| |
| import java.util.Set; |
| |
| import com.fasterxml.jackson.databind.InjectableValues; |
| import com.fasterxml.jackson.databind.ser.impl.SimpleFilterProvider; |
| import org.apache.drill.common.expression.LogicalExpression; |
| import org.apache.drill.common.expression.SchemaPath; |
| import org.apache.drill.common.logical.FormatPluginConfig; |
| import org.apache.drill.common.logical.StoragePluginConfig; |
| import org.apache.drill.common.logical.data.LogicalOperator; |
| import org.apache.drill.common.scanner.persistence.ScanResult; |
| import org.apache.drill.common.logical.security.CredentialsProvider; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.fasterxml.jackson.core.JsonGenerator; |
| import com.fasterxml.jackson.core.JsonParser; |
| import com.fasterxml.jackson.core.JsonParser.Feature; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.SerializationFeature; |
| import com.fasterxml.jackson.databind.module.SimpleModule; |
| |
| |
| public class LogicalPlanPersistence { |
| private static final Logger logger = LoggerFactory.getLogger(LogicalPlanPersistence.class); |
| |
| private final ObjectMapper mapper; |
| |
| public LogicalPlanPersistence(DrillConfig conf, ScanResult scanResult) { |
| this(conf, scanResult, new ObjectMapper()); |
| } |
| |
| public LogicalPlanPersistence(DrillConfig conf, ScanResult scanResult, ObjectMapper mapper) { |
| // The UI allows comments in JSON. Since we use the mapper |
| // here to serialize plugin configs to/from the pe |
| this.mapper = mapper |
| .configure(JsonParser.Feature.ALLOW_COMMENTS, true); |
| |
| SimpleModule deserModule = new SimpleModule("LogicalExpressionDeserializationModule") |
| .addDeserializer(LogicalExpression.class, new LogicalExpression.De(conf)) |
| .addDeserializer(SchemaPath.class, new SchemaPath.De()); |
| |
| InjectableValues injectables = new InjectableValues.Std() |
| .addValue(DrillConfig.class, conf); |
| |
| mapper.setInjectableValues(injectables); |
| mapper.registerModule(deserModule); |
| mapper.enable(SerializationFeature.INDENT_OUTPUT); |
| mapper.configure(Feature.ALLOW_UNQUOTED_FIELD_NAMES, true); |
| mapper.configure(JsonGenerator.Feature.QUOTE_FIELD_NAMES, true); |
| mapper.configure(Feature.ALLOW_COMMENTS, true); |
| mapper.setFilterProvider(new SimpleFilterProvider().setFailOnUnknownId(false)); |
| // For LogicalOperatorBase |
| registerSubtypes(getSubTypes(scanResult, LogicalOperator.class)); |
| // For StoragePluginConfigBase |
| registerSubtypes(getSubTypes(scanResult, StoragePluginConfig.class)); |
| // For FormatPluginConfigBase |
| registerSubtypes(getSubTypes(scanResult, FormatPluginConfig.class)); |
| registerSubtypes(getSubTypes(scanResult, CredentialsProvider.class)); |
| } |
| |
| public ObjectMapper getMapper() { |
| return mapper; |
| } |
| |
| private <T> void registerSubtypes(Set<Class<? extends T>> types) { |
| for (Class<? extends T> type : types) { |
| mapper.registerSubtypes(type); |
| } |
| } |
| |
| /** |
| * Scan for implementations of the given interface. |
| * |
| * @param classpathScan Drill configuration object used to find the packages to scan |
| * @return list of classes that implement the interface. |
| */ |
| public static <T> Set<Class<? extends T>> getSubTypes(final ScanResult classpathScan, Class<T> parent) { |
| Set<Class<? extends T>> subclasses = classpathScan.getImplementations(parent); |
| if (logger.isDebugEnabled()) { |
| StringBuilder sb = new StringBuilder() |
| .append("Found ") |
| .append(subclasses.size()) |
| .append(" ") |
| .append(parent.getSimpleName()) |
| .append(" subclasses:\n"); |
| for (Class<?> c : subclasses) { |
| sb.append('\t'); |
| sb.append(c.getName()); |
| sb.append('\n'); |
| } |
| logger.debug(sb.toString()); |
| } |
| return subclasses; |
| } |
| } |