Add logging configuration.

pom.xml

@@ -69,12 +69,12 @@
             <dependency>
                 <groupId>org.slf4j</groupId>
                 <artifactId>slf4j-api</artifactId>
-                <version>1.7.2</version>
+                <version>1.7.6</version>
             </dependency>
             <dependency>
                 <groupId>org.slf4j</groupId>
                 <artifactId>slf4j-log4j12</artifactId>
-                <version>1.7.2</version>
+                <version>1.7.6</version>
             </dependency>
         </dependencies>
     </dependencyManagement>

src/main/java/com/hpcloud/mon/ThresholdingEngine.java

@@ -1,17 +1,17 @@
 package com.hpcloud.mon;
 
-import java.io.File;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
 import backtype.storm.Config;
 import backtype.storm.LocalCluster;
 import backtype.storm.StormSubmitter;
 import backtype.storm.generated.StormTopology;
-
+import ch.qos.logback.classic.LoggerContext;
+import ch.qos.logback.core.util.StatusPrinter;
 import com.hpcloud.util.Injector;
 import com.hpcloud.util.config.ConfigurationFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.io.File;
 
 /**
  * Alarm thresholding engine.
@@ -38,6 +38,10 @@ public class ThresholdingEngine {
     }
 
     public static void main(String... args) throws Exception {
+
+        // Let's show the logging status.
+        StatusPrinter.print((LoggerContext) LoggerFactory.getILoggerFactory());
+
         if (args.length < 2) {
             LOG.error("Expected configuration file name and topology name arguments");
             System.exit(1);

src/main/java/com/hpcloud/mon/infrastructure/thresholding/KafkaSpout.java

@@ -63,10 +63,12 @@ public abstract class KafkaSpout extends BaseRichSpout {
 
     @Override
     public void nextTuple() {
-
+                      LOG.debug("nextTuple called");
         ConsumerIterator<byte[], byte[]> it = streams.get(0).iterator();
         if (it.hasNext()) {
-            processMessage(it.next().message(), collector);
+            byte[] message = it.next().message();
+            LOG.debug("Received message: " + message);
+            processMessage(message, collector);
         }
     }
 

src/main/resources/logback.xml

@@ -0,0 +1,26 @@
+<configuration scan="true" scanPeriod="30 seconds">
+
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <!-- encoders are assigned the type
+             ch.qos.logback.classic.encoder.PatternLayoutEncoder by default -->
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+
+    <appender name="FILE" class="ch.qos.logback.core.FileAppender">
+        <file>mon-thresh.log</file>
+
+        <encoder>
+            <pattern>%date %level [%thread] %logger{10} [%file:%line] %msg%n</pattern>
+        </encoder>
+    </appender>
+
+
+    <logger name="com.hpcloud" level = "debug"/>
+
+    <root level="info">
+        <appender-ref ref="STDOUT" />
+        <appender-ref ref="FILE" />
+    </root>
+</configuration>