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eheroteherot
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Expose marker parents as a list (including tests)
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‎log4j-layout-template-json-test/src/test/java/org/apache/logging/log4j/layout/template/json/resolver/MarkerResolverTest.java

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/*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache license, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the license for the specific language governing permissions and
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* limitations under the license.
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*/
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package org.apache.logging.log4j.layout.template.json.resolver;
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import java.util.Arrays;
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import org.apache.logging.log4j.Marker;
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import org.apache.logging.log4j.MarkerManager;
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import org.apache.logging.log4j.core.LogEvent;
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import org.apache.logging.log4j.core.impl.Log4jLogEvent;
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import org.apache.logging.log4j.layout.template.json.JsonTemplateLayout;
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import org.junit.jupiter.api.Test;
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import static org.apache.logging.log4j.layout.template.json.TestHelpers.*;
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import static org.assertj.core.api.Assertions.assertThat;
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class MarkerResolverTest {
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@Test
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void should_have_a_marker_name() {
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final String eventTemplate = writeJson(asMap(
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"marker",
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asMap(
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"$resolver", "marker",
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"field", "name"
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)
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));
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// Create the layout.
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final JsonTemplateLayout layout = JsonTemplateLayout
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.newBuilder()
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.setConfiguration(CONFIGURATION)
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.setEventTemplate(eventTemplate)
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.build();
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// Create the log event.
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final Marker marker = MarkerManager.getMarker("MARKER");
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final LogEvent logEvent = Log4jLogEvent
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.newBuilder()
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.setMarker(marker)
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.build();
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// Check the serialized event.
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usingSerializedLogEventAccessor(layout, logEvent, accessor -> {
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assertThat(accessor.getString("marker")).isEqualTo("MARKER");
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});
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}
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@Test
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void should_list_parents_as_array() {
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final String eventTemplate = writeJson(asMap(
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"parents",
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asMap(
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"$resolver", "marker",
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"field", "parents"
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)
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));
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// Create the layout.
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final JsonTemplateLayout layout = JsonTemplateLayout
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.newBuilder()
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.setConfiguration(CONFIGURATION)
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.setEventTemplate(eventTemplate)
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.build();
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// Create the log event.
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final Marker PARENT_MARKER_1 = MarkerManager.getMarker("PARENT_MARKER_NAME_1");
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final Marker PARENT_MARKER_2 = MarkerManager.getMarker("PARENT_MARKER_NAME_2");
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final Marker CHILD_MARKER = MarkerManager.getMarker("CHILD_MARKER_NAME");
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CHILD_MARKER.setParents(PARENT_MARKER_1, PARENT_MARKER_2);
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final LogEvent logEvent = Log4jLogEvent
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.newBuilder()
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.setMarker(CHILD_MARKER)
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.build();
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// Check the serialized event.
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usingSerializedLogEventAccessor(layout, logEvent, accessor -> {
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assertThat(accessor.getList("parents", String.class)).hasSize(2);
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assertThat(accessor.getList("parents", String.class)).containsAll(
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Arrays.asList(
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"PARENT_MARKER_NAME_1",
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"PARENT_MARKER_NAME_2"
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)
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);
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});
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}
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}

‎log4j-layout-template-json/src/main/java/org/apache/logging/log4j/layout/template/json/resolver/MarkerResolver.java

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*
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* <pre>
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* config = "field" -> "name"
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* config = "field" -> "parents"
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* </pre>
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*
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* <h3>Examples</h3>
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* "field": "name"
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* }
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* </pre>
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*
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* Resolve the marker's parents names:
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*
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* <pre>
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* {
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* "$resolver": "marker",
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* "field": "parents"
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* }
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* </pre>
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*/
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public final class MarkerResolver implements EventResolver {
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}
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};
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private static final TemplateResolver<LogEvent> PARENTS_RESOLVER =
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(final LogEvent logEvent, final JsonWriter jsonWriter) -> {
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final Marker marker = logEvent.getMarker();
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if (marker == null || !marker.hasParents()) {
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jsonWriter.writeNull();
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return;
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}
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final Marker[] parents = marker.getParents();
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jsonWriter.writeArrayStart();
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for (int i = 0; i < parents.length; i++) {
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if (i > 0) {
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jsonWriter.writeSeparator();
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}
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final Marker parentMarker = parents[i];
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jsonWriter.writeString(parentMarker.getName());
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}
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jsonWriter.writeArrayEnd();
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};
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private final TemplateResolver<LogEvent> internalResolver;
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MarkerResolver(final TemplateResolverConfig config) {
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private TemplateResolver<LogEvent> createInternalResolver(
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final TemplateResolverConfig config) {
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final String fieldName = config.getString("field");
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if ("name".equals(fieldName)) {
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return NAME_RESOLVER;
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}
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if ("parents".equals(fieldName)) {
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return PARENTS_RESOLVER;
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}
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throw new IllegalArgumentException("unknown field: " + config);
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}
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‎src/changelog/.2.x.x/MarkerResolver-expose-parents-as-list.xml

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<?xml version="1.0" encoding="UTF-8"?>
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<!--
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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-->
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<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xmlns="http://logging.apache.org/log4j/changelog"
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xsi:schemaLocation="http://logging.apache.org/log4j/changelog https://logging.apache.org/log4j/changelog-0.1.1.xsd"
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type="changed">
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<author id="eherot"/>
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<description format="asciidoc">
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PatternLayout can display the marker's parents with `%marker`.
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This will add that same capability to JSON Template Layout
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</description>
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</entry>

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