Java tutorial
/** * Licensed 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 net.logstash.logback.composite; import java.io.IOException; import net.logstash.logback.fieldnames.LogstashCommonFieldNames; import net.logstash.logback.fieldnames.LogstashFieldNames; import ch.qos.logback.access.spi.IAccessEvent; import ch.qos.logback.classic.spi.ILoggingEvent; import ch.qos.logback.core.Context; import ch.qos.logback.core.spi.DeferredProcessingAware; import com.fasterxml.jackson.core.JsonGenerator; /** * Writes properties from the {@link Context} into the JSON event. * * If the fieldName is set, then the properties will be written * to that field as a subobject. * Otherwise, the properties are written inline. * * @param <Event> type of event ({@link ILoggingEvent} or {@link IAccessEvent}). */ public class ContextJsonProvider<Event extends DeferredProcessingAware> extends AbstractFieldJsonProvider<Event> implements FieldNamesAware<LogstashCommonFieldNames> { @Override public void writeTo(JsonGenerator generator, Event event) throws IOException { if (getContext() != null) { if (getFieldName() != null) { generator.writeObjectFieldStart(getFieldName()); } JsonWritingUtils.writeMapEntries(generator, context.getCopyOfPropertyMap()); if (getFieldName() != null) { generator.writeEndObject(); } } } @Override public void setFieldNames(LogstashCommonFieldNames fieldNames) { if (fieldNames instanceof LogstashFieldNames) { setFieldName(((LogstashFieldNames) fieldNames).getContext()); } } }