Log progress of dumper (#295)

Author: ishmum123

.gitignore

@@ -19,3 +19,4 @@ node_modules
 /*.zip
 /*.tmp
 .DS_Store
+/progress.log.*

dumper/app/src/main/java/com/google/edwmigration/dumper/application/dumper/MetadataDumper.java

@@ -71,6 +71,7 @@
 public class MetadataDumper {
 
   private static final Logger LOG = LoggerFactory.getLogger(MetadataDumper.class);
+  private static final Logger PROGRESS_LOG = LoggerFactory.getLogger("progress-logger");
 
   private static final ImmutableMap<String, Connector> CONNECTORS;
 
@@ -277,8 +278,9 @@ public <T> T runChildTask(Task<T> task) throws MetadataDumperUsageException {
               }
             };
         TASK:
-        for (Task<?> task : tasks) {
-          runTask(runContext, state, task);
+        for (int i = 0; i < tasks.size(); i++) {
+          runTask(runContext, state, tasks.get(i));
+          PROGRESS_LOG.info("Finished " + (i + 1) + " out of " + tasks.size() + " tasks");
         }
 
       } finally {

dumper/app/src/main/resources/logback.xml

@@ -17,4 +17,16 @@
 		<appender-ref ref="CONSOLE" />
 	</root>
 
+	<timestamp key="currentTime" datePattern="yyyy-MM-dd_HHmmss"/>
+	<appender name="FILE" class="ch.qos.logback.core.FileAppender">
+		<file>progress.log.${currentTime}</file>
+		<encoder>
+			<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger - %msg%n</pattern>
+		</encoder>
+	</appender>
+
+	<logger name="progress-logger" additivity="false">
+		<appender-ref ref="FILE" />
+	</logger>
+
 </configuration>