feat(tailer): added Logger class

tailer/pom.xml

@@ -85,6 +85,12 @@
     </build>
 
     <dependencies>
+        <!--required for Logger class-->
+        <dependency>
+            <groupId>org.apache.logging.log4j</groupId>
+            <artifactId>log4j-slf4j-impl</artifactId>
+            <version>2.9.0</version>
+        </dependency>
         <!--required for Tailer class-->
         <dependency>
             <groupId>commons-io</groupId>

tailer/src/main/java/de/swingbe/tailer/Main.java

@@ -2,10 +2,13 @@ package de.swingbe.tailer;
 
 import org.apache.commons.io.input.Tailer;
 import org.apache.commons.io.input.TailerListener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
 
 public class Main {
+    public final static Logger LOG = LoggerFactory.getLogger(Main.class);
 
     //delay between checks of the file for new content in milliseconds
     public static final int DELAY_MILLIS = 500;
@@ -14,12 +17,12 @@ public class Main {
     public static final boolean END = true;
 
     public static void main(String[] args) {
-        System.out.println("Hello world!");
+        LOG.trace("Entering application.");
 
         TailerListener listener = new MyListener();
 
         //create and use a Tailer with a Thread
-        String fileName = "NetPeerManager.log";
+        String fileName = "/opt/npm/NetPeerManager.log";
         //TODO What is the behaviour of the reOpen parameter?
         Tailer tailer = new Tailer(new File(fileName), listener, DELAY_MILLIS, END);
         tailer.run();
@@ -31,6 +34,7 @@ public class Main {
 
         thread.start();
 
+        LOG.trace("Exiting application.");
         return;
     }
 }

tailer/src/main/java/de/swingbe/tailer/MyListener.java

@@ -1,10 +1,14 @@
 package de.swingbe.tailer;
 
 import org.apache.commons.io.input.TailerListenerAdapter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class MyListener extends TailerListenerAdapter {
+    public final static Logger LOG = LoggerFactory.getLogger(MyListener.class);
+
     @Override
     public void handle(String line) {
-        System.out.println(line);
+        LOG.debug("{}", line);
     }
 }

tailer/src/main/resources/log4j2.xml

@@ -0,0 +1,32 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="INFO">
+    <Appenders>
+        <RollingFile name="rollingFile"
+                     fileName="sizeRolling.log"
+                     filePattern="sizeRolling-%d{yyyy-MM-dd}.log"
+                     ignoreExceptions="false"
+        >
+            <PatternLayout>
+                <Pattern>[%-5p] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1} %m%n</Pattern>
+            </PatternLayout>
+            <Policies>
+                <SizeBasedTriggeringPolicy size="21MB"/>
+            </Policies>
+            <DefaultRolloverStrategy max="5"/>
+        </RollingFile>
+
+        <Console name="console" target="SYSTEM_OUT">
+            <PatternLayout
+                    pattern="[%-5level] %d{yyyy-MM-dd HH:mm:ss.SSS} %c{1} - %msg%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Logger name="de.swingbe" level="all" additivity="true">
+            <appender-ref ref="rollingFile" level="debug"/>
+        </Logger>
+        <Root level="debug" additivity="false">
+            <appender-ref ref="console"/>
+        </Root>
+    </Loggers>
+
+</Configuration>