From 7ec77df0960181bdf35e8770d332ac7602b43e8a Mon Sep 17 00:00:00 2001 From: Chirag Dewan Date: Mon, 4 May 2020 18:11:12 +0530 Subject: [PATCH] BAEL1731 Adding listappender --- .../logging/log4j2/plugins/ListAppender.java | 48 +++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/plugins/ListAppender.java diff --git a/logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/plugins/ListAppender.java b/logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/plugins/ListAppender.java new file mode 100644 index 0000000000..e3819028db --- /dev/null +++ b/logging-modules/log4j2/src/main/java/com/baeldung/logging/log4j2/plugins/ListAppender.java @@ -0,0 +1,48 @@ +/** + * + */ +package com.baeldung.logging.log4j2.plugins; + +import org.apache.logging.log4j.Level; +import org.apache.logging.log4j.core.Appender; +import org.apache.logging.log4j.core.Core; +import org.apache.logging.log4j.core.Filter; +import org.apache.logging.log4j.core.LogEvent; +import org.apache.logging.log4j.core.appender.AbstractAppender; +import org.apache.logging.log4j.core.config.plugins.Plugin; +import org.apache.logging.log4j.core.config.plugins.PluginAttribute; +import org.apache.logging.log4j.core.config.plugins.PluginElement; +import org.apache.logging.log4j.core.config.plugins.PluginFactory; + +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; + +import static java.util.Collections.synchronizedList; + +@Plugin(name = "ListAppender", category = Core.CATEGORY_NAME, elementType = Appender.ELEMENT_TYPE) +public class ListAppender extends AbstractAppender { + + private List logList; + + protected ListAppender(String name, Filter filter) { + super(name, filter, null); + logList = synchronizedList(new ArrayList<>()); + } + + @PluginFactory + public static ListAppender createAppender(@PluginAttribute("name") String name, @PluginElement("Filter") final Filter filter) { + return new ListAppender(name, filter); + } + + @Override + public void append(LogEvent event) { + if (event.getLevel() + .isLessSpecificThan(Level.WARN)) { + error("Unable to log less than WARN level."); + return; + } + logList.add(event); + } + +}