| /* |
| * 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.logging.log4j.jpa.converter; |
| |
| import java.io.IOException; |
| import java.util.Iterator; |
| import java.util.Map; |
| import javax.persistence.AttributeConverter; |
| import javax.persistence.Converter; |
| import javax.persistence.PersistenceException; |
| |
| import org.apache.logging.log4j.util.ReadOnlyStringMap; |
| import org.apache.logging.log4j.core.impl.ContextDataFactory; |
| import org.apache.logging.log4j.util.StringMap; |
| import org.apache.logging.log4j.util.BiConsumer; |
| import org.apache.logging.log4j.util.Strings; |
| |
| import com.fasterxml.jackson.databind.JsonNode; |
| import com.fasterxml.jackson.databind.ObjectMapper; |
| import com.fasterxml.jackson.databind.node.JsonNodeFactory; |
| import com.fasterxml.jackson.databind.node.ObjectNode; |
| |
| /** |
| * A JPA 2.1 attribute converter for {@link ReadOnlyStringMap}s in |
| * {@link org.apache.logging.log4j.core.LogEvent}s. This converter is capable of converting both to and from |
| * {@link String}s. |
| * |
| * In addition to other optional dependencies required by the JPA appender, this converter requires the Jackson Data |
| * Processor. |
| */ |
| @Converter(autoApply = false) |
| public class ContextDataJsonAttributeConverter implements AttributeConverter<ReadOnlyStringMap, String> { |
| static final ObjectMapper OBJECT_MAPPER = new ObjectMapper(); |
| |
| @Override |
| public String convertToDatabaseColumn(final ReadOnlyStringMap contextData) { |
| if (contextData == null) { |
| return null; |
| } |
| |
| try { |
| final JsonNodeFactory factory = OBJECT_MAPPER.getNodeFactory(); |
| final ObjectNode root = factory.objectNode(); |
| contextData.forEach((key, value) -> { |
| // we will cheat here and write the toString of the Object... meh, but ok. |
| root.put(key, String.valueOf(value)); |
| }); |
| return OBJECT_MAPPER.writeValueAsString(root); |
| } catch (final Exception e) { |
| throw new PersistenceException("Failed to convert contextData to JSON string.", e); |
| } |
| } |
| |
| @Override |
| public ReadOnlyStringMap convertToEntityAttribute(final String s) { |
| if (Strings.isEmpty(s)) { |
| return null; |
| } |
| try { |
| final StringMap result = ContextDataFactory.createContextData(); |
| final ObjectNode root = (ObjectNode) OBJECT_MAPPER.readTree(s); |
| final Iterator<Map.Entry<String, JsonNode>> entries = root.fields(); |
| while (entries.hasNext()) { |
| final Map.Entry<String, JsonNode> entry = entries.next(); |
| |
| // Don't know what to do with non-text values. |
| // Maybe users who need this need to provide custom converter? |
| final Object value = entry.getValue().textValue(); |
| result.putValue(entry.getKey(), value); |
| } |
| return result; |
| } catch (final IOException e) { |
| throw new PersistenceException("Failed to convert JSON string to map.", e); |
| } |
| } |
| } |