MetricsManager is now configurable.

libresonic-main/src/main/java/org/libresonic/player/boot/Application.java

@@ -146,10 +146,15 @@ public class Application extends SpringBootServletInitializer {
         return registration;
     }
 
+    @Bean
+    public Filter metricsFilter() {
+        return new MetricsFilter();
+    }
+
     @Bean
     public FilterRegistrationBean metricsFilterRegistration() {
         FilterRegistrationBean registration = new FilterRegistrationBean();
-        registration.setFilter(new MetricsFilter());
+        registration.setFilter(metricsFilter());
         registration.setOrder(7);
         return registration;
     }

libresonic-main/src/main/java/org/libresonic/player/filter/MetricsFilter.java

@@ -1,30 +1,23 @@
 package org.libresonic.player.filter;
 
-import com.codahale.metrics.JmxReporter;
-import com.codahale.metrics.MetricRegistry;
 import org.libresonic.player.monitor.MetricsManager;
+import org.springframework.beans.factory.annotation.Autowired;
 
 import javax.servlet.*;
 import javax.servlet.http.HttpServletRequest;
 
 import java.io.IOException;
-import java.util.concurrent.TimeUnit;
 
 /**
  * Created by remi on 12/01/17.
  */
 public class MetricsFilter implements Filter {
 
-    private final MetricRegistry metrics = new MetricRegistry();
+    @Autowired
-    JmxReporter reporter;
+    private MetricsManager metricsManager;
 
     @Override
     public void init(FilterConfig filterConfig) throws ServletException {
-        reporter = JmxReporter.forRegistry(metrics)
-                .convertRatesTo(TimeUnit.SECONDS.SECONDS)
-                .convertDurationsTo(TimeUnit.MILLISECONDS)
-                .build();
-        reporter.start();
     }
 
     @Override
@@ -32,13 +25,12 @@ public class MetricsFilter implements Filter {
         HttpServletRequest httpServletRequest = (HttpServletRequest)request;
 
         String timerName = httpServletRequest.getRequestURI();
-        try (MetricsManager.Timer t = MetricsManager.condition(timerName.contains("main.view")).timer(this,timerName)) {
+        try (MetricsManager.Timer t = metricsManager.condition(timerName.contains("main.view")).timer(this,timerName)) {
             chain.doFilter(request, response);
         }
     }
 
     @Override
     public void destroy() {
-        reporter.stop();
     }
 }

libresonic-main/src/main/java/org/libresonic/player/monitor/MetricsManager.java

@@ -2,6 +2,7 @@ package org.libresonic.player.monitor;
 
 import com.codahale.metrics.JmxReporter;
 import com.codahale.metrics.MetricRegistry;
+import org.libresonic.player.service.ApacheCommonsConfigurationService;
 
 import java.util.concurrent.TimeUnit;
 
@@ -10,18 +11,41 @@ import java.util.concurrent.TimeUnit;
  */
 public class MetricsManager {
 
+    private ApacheCommonsConfigurationService configurationService;
+
     // Main metrics registry
     private static final MetricRegistry metrics = new MetricRegistry();
 
+    private static Boolean metricsActivatedByConfiguration = null;
+    private static Object _lock = new Object();
+
     // Potential metrics reporters
     private static JmxReporter reporter;
 
-    static {
+    private void configureMetricsActivation() {
+        if (configurationService.containsKey("Metrics")) {
+            metricsActivatedByConfiguration = Boolean.TRUE;
+
+            // Start a Metrics JMX reporter
             reporter = JmxReporter.forRegistry(metrics)
                     .convertRatesTo(TimeUnit.SECONDS.SECONDS)
                     .convertDurationsTo(TimeUnit.MILLISECONDS)
                     .build();
             reporter.start();
+        } else {
+            metricsActivatedByConfiguration = Boolean.FALSE;
+        }
+    }
+
+    private boolean metricsActivatedByConfiguration() {
+        if (metricsActivatedByConfiguration == null) {
+            synchronized (_lock) {
+                if (metricsActivatedByConfiguration == null) {
+                    configureMetricsActivation();
+                }
+            }
+        }
+        return metricsActivatedByConfiguration.booleanValue();
     }
 
     /**
@@ -31,8 +55,12 @@ public class MetricsManager {
      * @param name
      * @return
      */
-    public static Timer timer(Class clazz, String name) {
+    public Timer timer(Class clazz, String name) {
+        if (metricsActivatedByConfiguration()) {
             return new TimerBuilder().timer(clazz, name);
+        } else {
+            return nullTimerSingleton;
+        }
     }
 
     /**
@@ -42,7 +70,7 @@ public class MetricsManager {
      * @param name
      * @return
      */
-    public static Timer timer(Object ref, String name) {
+    public Timer timer(Object ref, String name) {
         return timer(ref.getClass(),name);
     }
 
@@ -54,11 +82,19 @@ public class MetricsManager {
      * @param ifTrue
      * @return
      */
-    public static TimerBuilder condition(boolean ifTrue) {
+    public TimerBuilder condition(boolean ifTrue) {
+        if (metricsActivatedByConfiguration()) {
             if (ifTrue == false) {
                 return conditionFalseTimerBuilderSingleton;
             }
             return new TimerBuilder();
+        } else {
+            return nullTimerBuilderSingleton;
+        }
+    }
+
+    public void setConfigurationService(ApacheCommonsConfigurationService configurationService) {
+        this.configurationService = configurationService;
     }
 
     /**
@@ -102,7 +138,8 @@ public class MetricsManager {
     // Convenient singletons to avoid creating useless objects instances
     // -----------------------------------------------------------------
     private static final NullTimer nullTimerSingleton = new NullTimer(null);
-    private static final ConditionFalseTimerBuilder conditionFalseTimerBuilderSingleton = new ConditionFalseTimerBuilder();
+    private static final NullTimerBuilder conditionFalseTimerBuilderSingleton = new NullTimerBuilder();
+    private static final NullTimerBuilder nullTimerBuilderSingleton = new NullTimerBuilder();
 
     private static class NullTimer extends Timer {
 
@@ -116,7 +153,7 @@ public class MetricsManager {
         }
     }
 
-    private static class ConditionFalseTimerBuilder extends TimerBuilder {
+    private static class NullTimerBuilder extends TimerBuilder {
         @Override
         public Timer timer(Class clazz, String name) {
             return nullTimerSingleton;

libresonic-main/src/main/resources/applicationContext-service.xml

@@ -92,6 +92,10 @@
 
     <bean id="configurationService" class="org.libresonic.player.service.ApacheCommonsConfigurationService" />
 
+    <bean id="metricsManager" class="org.libresonic.player.monitor.MetricsManager">
+        <property name="configurationService" ref="configurationService" />
+    </bean>
+
     <bean id="settingsService" class="org.libresonic.player.service.SettingsService" init-method="init">
         <property name="internetRadioDao" ref="internetRadioDao"/>
         <property name="musicFolderDao" ref="musicFolderDao"/>