Enable usage of SysMonitor to verify disk locations via DruidSysMonitor

pom.xml

@@ -86,7 +86,7 @@
             <dependency>
                 <groupId>com.metamx</groupId>
                 <artifactId>server-metrics</artifactId>
-                <version>0.0.4</version>
+                <version>0.0.5</version>
             </dependency>
 
             <dependency>

server/src/main/java/io/druid/server/metrics/DruidSysMonitor.java

@@ -0,0 +1,47 @@
+/*
+ * Druid - a distributed column store.
+ * Copyright (C) 2012, 2013  Metamarkets Group Inc.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+package io.druid.server.metrics;
+
+import com.google.common.collect.Lists;
+import com.google.inject.Inject;
+import com.metamx.metrics.SysMonitor;
+import io.druid.segment.loading.SegmentLoaderConfig;
+import io.druid.segment.loading.StorageLocationConfig;
+
+import java.util.List;
+
+/**
+ */
+public class DruidSysMonitor extends SysMonitor
+{
+  @Inject
+  public DruidSysMonitor(
+      SegmentLoaderConfig config
+  )
+  {
+    final List<StorageLocationConfig> locs = config.getLocations();
+    List<String> dirs = Lists.newArrayListWithExpectedSize(locs.size());
+    for (StorageLocationConfig loc : locs) {
+      dirs.add(loc.getPath().toString());
+    }
+
+    addDirectoriesToMonitor(dirs.toArray(new String[dirs.size()]));
+  }
+}