diff --git a/apps/graphitemetrics/src/main/java/org/onosproject/graphitemetrics/DefaultGraphiteMetricsReporter.java b/apps/graphitemetrics/src/main/java/org/onosproject/graphitemetrics/DefaultGraphiteMetricsReporter.java
new file mode 100644
index 0000000..89453a7
--- /dev/null
+++ b/apps/graphitemetrics/src/main/java/org/onosproject/graphitemetrics/DefaultGraphiteMetricsReporter.java
@@ -0,0 +1,266 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.graphitemetrics;
+
+
+import com.codahale.metrics.MetricRegistry;
+import com.codahale.metrics.graphite.Graphite;
+import com.codahale.metrics.graphite.GraphiteReporter;
+import org.apache.commons.lang.StringUtils;
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Modified;
+import org.apache.felix.scr.annotations.Property;
+import org.apache.felix.scr.annotations.Reference;
+import org.apache.felix.scr.annotations.ReferenceCardinality;
+import org.onlab.metrics.MetricsService;
+import org.onlab.util.Tools;
+import org.onosproject.cfg.ComponentConfigService;
+import org.onosproject.core.CoreService;
+import org.osgi.service.component.ComponentContext;
+import org.slf4j.Logger;
+
+import java.net.InetSocketAddress;
+import java.util.Dictionary;
+import java.util.concurrent.TimeUnit;
+
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * A metric report that reports all metrics value to graphite monitoring server.
+ */
+@Component(immediate = true)
+public class DefaultGraphiteMetricsReporter implements GraphiteMetricsReporter {
+
+    private final Logger log = getLogger(getClass());
+
+    private static final TimeUnit REPORT_TIME_UNIT = TimeUnit.MINUTES;
+    private static final int DEFAULT_REPORT_PERIOD = 1;
+
+    private static final String DEFAULT_METRIC_NAMES = "default";
+    private static final String DEFAULT_ADDRESS = "localhost";
+    private static final int DEFAULT_PORT = 2003;
+    private static final String DEFAULT_METRIC_NAME_PREFIX = "onos";
+
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected CoreService coreService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected MetricsService metricsService;
+
+    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
+    protected ComponentConfigService cfgService;
+
+    @Property(name = "monitorAll", boolValue = true,
+            label = "Enable to monitor all of metrics stored in metric registry default is true")
+    protected boolean monitorAll = true;
+
+    @Property(name = "metricNames", value = DEFAULT_METRIC_NAMES,
+            label = "Names of metric to be monitored; default metric names are 'default'")
+    protected String metricNames = DEFAULT_METRIC_NAMES;
+
+    @Property(name = "address", value = DEFAULT_ADDRESS,
+            label = "IP address of graphite monitoring server; default is localhost")
+    protected String address = DEFAULT_ADDRESS;
+
+    @Property(name = "port", intValue = DEFAULT_PORT,
+            label = "Port number of graphite monitoring server; default is 2003")
+    protected int port = DEFAULT_PORT;
+
+    @Property(name = "reportPeriod", intValue = DEFAULT_REPORT_PERIOD,
+            label = "Reporting period of graphite monitoring server; default is 1")
+    protected int reportPeriod = DEFAULT_REPORT_PERIOD;
+
+    @Property(name = "metricNamePrefix", value = DEFAULT_METRIC_NAME_PREFIX,
+            label = "Prefix of metric name for graphite back-end server; default is 'onos'")
+    protected String metricNamePrefix = DEFAULT_METRIC_NAME_PREFIX;
+
+    private Graphite graphite;
+    private GraphiteReporter graphiteReporter;
+
+    @Activate
+    public void activate() {
+        cfgService.registerProperties(getClass());
+        coreService.registerApplication("org.onosproject.graphitemetrics");
+        metricsService.registerReporter(this);
+
+        startReport();
+        log.info("Started");
+    }
+
+    @Deactivate
+    public void deactivate() {
+        cfgService.unregisterProperties(getClass(), false);
+
+        stopReport();
+        metricsService.unregisterReporter(this);
+
+        log.info("Stopped");
+    }
+
+    @Modified
+    public void modified(ComponentContext context) {
+        readComponentConfiguration(context);
+
+        // Restarts reporting
+        stopReport();
+        startReport();
+    }
+
+    public void startReport() {
+        configGraphite();
+        graphiteReporter = buildReporter(graphite);
+        graphiteReporter.start(reportPeriod, REPORT_TIME_UNIT);
+        log.info("Start to report metrics to graphite server.");
+    }
+
+    public void stopReport() {
+        graphiteReporter.stop();
+        graphite = null;
+        graphiteReporter = null;
+        log.info("Stop reporting metrics to graphite server.");
+    }
+
+    @Override
+    public void restartReport() {
+        stopReport();
+        startReport();
+    }
+
+    @Override
+    public void notifyMetricsChange() {
+        graphiteReporter.stop();
+        graphiteReporter = buildReporter(graphite);
+        graphiteReporter.start(DEFAULT_REPORT_PERIOD, REPORT_TIME_UNIT);
+        log.info("Metric registry has been changed, apply changes.");
+    }
+
+    /**
+     * Filters the metrics to only include a set of the given metrics.
+     *
+     * @param metricRegistry original metric registry
+     * @return filtered metric registry
+     */
+    protected MetricRegistry filter(MetricRegistry metricRegistry) {
+        if (!monitorAll) {
+            final MetricRegistry filtered = new MetricRegistry();
+            metricRegistry.getNames().stream().filter(name ->
+                    containsName(name, metricNames)).forEach(name ->
+                    filtered.register(name, metricRegistry.getMetrics().get(name)));
+            return filtered;
+        } else {
+            return metricRegistry;
+        }
+    }
+
+    /**
+     * Looks up whether the metric name contains the given prefix keywords.
+     * Note that the keywords are separated with comma as delimiter
+     *
+     * @param full the original metric name that to be compared with
+     * @param prefixes the prefix keywords that are matched against with the metric name
+     * @return boolean value that denotes whether the metric name starts with the given prefix
+     */
+    protected boolean containsName(String full, String prefixes) {
+        String[] prefixArray = StringUtils.split(prefixes, ",");
+        for (String prefix : prefixArray) {
+            if (StringUtils.startsWith(full, StringUtils.trimToEmpty(prefix))) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Extracts properties from the component configuration context.
+     *
+     * @param context the component context
+     */
+    private void readComponentConfiguration(ComponentContext context) {
+        Dictionary<?, ?> properties = context.getProperties();
+
+        Boolean newMonitorAll = Tools.isPropertyEnabled(properties, "monitorAll");
+        if (newMonitorAll == null) {
+            log.info("Monitor all metrics is not configured, " +
+                    "using current value of {}", monitorAll);
+        } else {
+            monitorAll = newMonitorAll;
+            log.info("Configured. Monitor all metrics is {}, ",
+                    monitorAll ? "enabled" : "disabled");
+        }
+
+        String newMetricNames = Tools.get(properties, "metricNames");
+        metricNames = newMetricNames != null ? newMetricNames : DEFAULT_METRIC_NAMES;
+        log.info("Configured. Metric name is {}", metricNames);
+
+        String newAddress = Tools.get(properties, "address");
+        address = newAddress != null ? newAddress : DEFAULT_ADDRESS;
+        log.info("Configured. Graphite monitoring server address is {}", address);
+
+        Integer newPort = Tools.getIntegerProperty(properties, "port");
+        if (newPort == null) {
+            port = DEFAULT_PORT;
+            log.info("Graphite port is not configured, default value is {}", port);
+        } else {
+            port = newPort;
+            log.info("Configured. Graphite port is configured to {}", port);
+        }
+
+        Integer newReportPeriod = Tools.getIntegerProperty(properties, "reportPeriod");
+        if (newReportPeriod == null) {
+            reportPeriod = DEFAULT_REPORT_PERIOD;
+            log.info("Report period of graphite server is not configured, " +
+                    "default value is {}", reportPeriod);
+        } else {
+            reportPeriod = newReportPeriod;
+            log.info("Configured. Report period of graphite server" +
+                    " is configured to {}", reportPeriod);
+        }
+
+        String newMetricNamePrefix = Tools.get(properties, "metricNamePrefix");
+        metricNamePrefix = newMetricNamePrefix != null ?
+                newMetricNamePrefix : DEFAULT_METRIC_NAME_PREFIX;
+
+    }
+
+    /**
+     * Configures parameters for graphite config.
+     */
+    private void configGraphite() {
+        try {
+            graphite = new Graphite(new InetSocketAddress(address, port));
+        } catch (Exception e) {
+            log.error("Fail to connect to given graphite server! : " + e.getMessage());
+        }
+    }
+
+    /**
+     * Builds reporter with the given graphite config.
+     *
+     * @param graphiteCfg graphite config
+     * @return reporter
+     */
+    private GraphiteReporter buildReporter(Graphite graphiteCfg) {
+        MetricRegistry metricRegistry = metricsService.getMetricRegistry();
+        return GraphiteReporter.forRegistry(filter(metricRegistry))
+                .prefixedWith(metricNamePrefix)
+                .convertRatesTo(TimeUnit.SECONDS)
+                .convertDurationsTo(TimeUnit.MILLISECONDS)
+                .build(graphiteCfg);
+    }
+}
diff --git a/apps/graphitemetrics/src/main/java/org/onosproject/graphitemetrics/GraphiteMetricsReporter.java b/apps/graphitemetrics/src/main/java/org/onosproject/graphitemetrics/GraphiteMetricsReporter.java
index 1b03794..50d2093 100644
--- a/apps/graphitemetrics/src/main/java/org/onosproject/graphitemetrics/GraphiteMetricsReporter.java
+++ b/apps/graphitemetrics/src/main/java/org/onosproject/graphitemetrics/GraphiteMetricsReporter.java
@@ -15,222 +15,10 @@
  */
 package org.onosproject.graphitemetrics;
 
-
-import com.codahale.metrics.MetricRegistry;
-import com.codahale.metrics.graphite.Graphite;
-import com.codahale.metrics.graphite.GraphiteReporter;
-import org.apache.commons.lang.StringUtils;
-import org.apache.felix.scr.annotations.Activate;
-import org.apache.felix.scr.annotations.Component;
-import org.apache.felix.scr.annotations.Deactivate;
-import org.apache.felix.scr.annotations.Modified;
-import org.apache.felix.scr.annotations.Property;
-import org.apache.felix.scr.annotations.Reference;
-import org.apache.felix.scr.annotations.ReferenceCardinality;
-import org.onlab.util.Tools;
-import org.onosproject.core.ApplicationId;
-import org.onosproject.core.CoreService;
-import org.onlab.metrics.MetricsService;
-import org.onosproject.cfg.ComponentConfigService;
-import org.osgi.service.component.ComponentContext;
-import org.slf4j.Logger;
-import java.net.InetSocketAddress;
-import java.util.Dictionary;
-import java.util.concurrent.TimeUnit;
-
-import static org.slf4j.LoggerFactory.getLogger;
+import org.onlab.metrics.MetricsReporter;
 
 /**
- * A metric report that reports all metrics value to graphite monitoring server.
+ * Interface of graphite reporter that reports all metrics value to graphite server.
  */
-@Component(immediate = true)
-public class GraphiteMetricsReporter {
-
-    private final Logger log = getLogger(getClass());
-
-    private static final TimeUnit REPORT_TIME_UNIT = TimeUnit.MINUTES;
-    private static final int DEFAULT_REPORT_PERIOD = 1;
-
-    private static final String DEFAULT_METRIC_NAMES = "default";
-    private static final String DEFAULT_ADDRESS = "localhost";
-    private static final int DEFAULT_PORT = 2003;
-    private static final String DEFAULT_METRIC_NAME_PREFIX = "onos";
-
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected CoreService coreService;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected MetricsService metricsService;
-
-    @Reference(cardinality = ReferenceCardinality.MANDATORY_UNARY)
-    protected ComponentConfigService cfgService;
-
-    @Property(name = "monitorAll", boolValue = true,
-            label = "Enable to monitor all of metrics stored in metric registry default is true")
-    protected boolean monitorAll = true;
-
-    @Property(name = "metricNames", value = DEFAULT_METRIC_NAMES,
-            label = "Names of metric to be monitored; default metric names are 'default'")
-    protected String metricNames = DEFAULT_METRIC_NAMES;
-
-    @Property(name = "address", value = DEFAULT_ADDRESS,
-            label = "IP address of graphite monitoring server; default is localhost")
-    protected String address = DEFAULT_ADDRESS;
-
-    @Property(name = "port", intValue = DEFAULT_PORT,
-            label = "Port number of graphite monitoring server; default is 2003")
-    protected int port = DEFAULT_PORT;
-
-    @Property(name = "reportPeriod", intValue = DEFAULT_REPORT_PERIOD,
-            label = "Reporting period of graphite monitoring server; default is 1")
-    protected int reportPeriod = DEFAULT_REPORT_PERIOD;
-
-    @Property(name = "metricNamePrefix", value = DEFAULT_METRIC_NAME_PREFIX,
-            label = "Prefix of metric name for graphite back-end server; default is 'onos'")
-    protected String metricNamePrefix = DEFAULT_METRIC_NAME_PREFIX;
-
-
-    private ApplicationId appId;
-    private Graphite graphite;
-    private GraphiteReporter graphiteReporter;
-
-    @Activate
-    public void activate() {
-        cfgService.registerProperties(getClass());
-        appId = coreService.registerApplication("org.onosproject.metrics.reporter");
-
-        startReport();
-        log.info("Started");
-    }
-
-    @Deactivate
-    public void deactivate() {
-        cfgService.unregisterProperties(getClass(), false);
-
-        stopReport();
-        log.info("Stopped");
-    }
-
-    @Modified
-    public void modified(ComponentContext context) {
-        readComponentConfiguration(context);
-
-        // Restarts reporting
-        stopReport();
-        startReport();
-    }
-
-    public void startReport() {
-        try {
-            graphite = new Graphite(new InetSocketAddress(address, port));
-
-            MetricRegistry metricRegistry = metricsService.getMetricRegistry();
-
-            graphiteReporter = GraphiteReporter.forRegistry(filter(metricRegistry))
-                    .prefixedWith(metricNamePrefix)
-                    .convertRatesTo(TimeUnit.SECONDS)
-                    .convertDurationsTo(TimeUnit.MILLISECONDS)
-                    .build(graphite);
-
-            graphiteReporter.start(reportPeriod, REPORT_TIME_UNIT);
-            log.info("Start to report metrics to graphite.");
-        } catch (Exception e) {
-            log.error("Fail to connect to given graphite server! : " + e.getMessage());
-        }
-    }
-
-    public void stopReport() {
-        graphiteReporter.stop();
-        graphite = null;
-        graphiteReporter = null;
-    }
-
-    /**
-     * Filters the metrics to only include a set of the given metrics.
-     *
-     * @param metricRegistry original metric registry
-     * @return filtered metric registry
-     */
-    protected MetricRegistry filter(MetricRegistry metricRegistry) {
-        if (!monitorAll) {
-            final MetricRegistry filtered = new MetricRegistry();
-            metricRegistry.getNames().stream().filter(name ->
-                    containsName(name, metricNames)).forEach(name ->
-                    filtered.register(name, metricRegistry.getMetrics().get(name)));
-            return filtered;
-        } else {
-            return metricRegistry;
-        }
-    }
-
-    /**
-     * Looks up whether the metric name contains the given prefix keywords.
-     * Note that the keywords are separated with comma as delimiter
-     *
-     * @param full the original metric name that to be compared with
-     * @param prefixes the prefix keywords that are matched against with the metric name
-     * @return boolean value that denotes whether the metric name starts with the given prefix
-     */
-    protected boolean containsName(String full, String prefixes) {
-        String[] prefixArray = StringUtils.split(prefixes, ",");
-        for (String prefix : prefixArray) {
-            if (StringUtils.startsWith(full, StringUtils.trimToEmpty(prefix))) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    /**
-     * Extracts properties from the component configuration context.
-     *
-     * @param context the component context
-     */
-    private void readComponentConfiguration(ComponentContext context) {
-        Dictionary<?, ?> properties = context.getProperties();
-
-        Boolean newMonitorAll = Tools.isPropertyEnabled(properties, "monitorAll");
-        if (newMonitorAll == null) {
-            log.info("Monitor all metrics is not configured, " +
-                    "using current value of {}", monitorAll);
-        } else {
-            monitorAll = newMonitorAll;
-            log.info("Configured. Monitor all metrics is {}, ",
-                    monitorAll ? "enabled" : "disabled");
-        }
-
-        String newMetricNames = Tools.get(properties, "metricNames");
-        metricNames = newMetricNames != null ? newMetricNames : DEFAULT_METRIC_NAMES;
-        log.info("Configured. Metric name is {}", metricNames);
-
-        String newAddress = Tools.get(properties, "address");
-        address = newAddress != null ? newAddress : DEFAULT_ADDRESS;
-        log.info("Configured. Graphite monitoring server address is {}", address);
-
-        Integer newPort = Tools.getIntegerProperty(properties, "port");
-        if (newPort == null) {
-            port = DEFAULT_PORT;
-            log.info("Graphite port is not configured, default value is {}", port);
-        } else {
-            port = newPort;
-            log.info("Configured. Graphite port is configured to {}", port);
-        }
-
-        Integer newReportPeriod = Tools.getIntegerProperty(properties, "reportPeriod");
-        if (newReportPeriod == null) {
-            reportPeriod = DEFAULT_REPORT_PERIOD;
-            log.info("Report period of graphite server is not configured, " +
-                    "default value is {}", reportPeriod);
-        } else {
-            reportPeriod = newReportPeriod;
-            log.info("Configured. Report period of graphite server" +
-                    " is configured to {}", reportPeriod);
-        }
-
-        String newMetricNamePrefix = Tools.get(properties, "metricNamePrefix");
-        metricNamePrefix = newMetricNamePrefix != null ?
-                newMetricNamePrefix : DEFAULT_METRIC_NAME_PREFIX;
-
-    }
-}
\ No newline at end of file
+public interface GraphiteMetricsReporter extends MetricsReporter {
+}