Expose metrics through the HikariDataSource.

hikaricp-java6/src/main/java/com/zaxxer/hikari/HikariDataSource.java

@@ -29,6 +29,7 @@ import javax.sql.DataSource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.zaxxer.hikari.metrics.IMetricsTracker;
 import com.zaxxer.hikari.pool.HikariPool;
 import com.zaxxer.hikari.proxy.IHikariConnectionProxy;
 import com.zaxxer.hikari.util.DriverDataSource;
@@ -215,6 +216,18 @@ public class HikariDataSource extends HikariConfig implements DataSource, Closea
       }
    }
 
+   /**
+    * Get the metrics tracker associated with this DataSource.  If metrics collection is
+    * disabled, the resulting object will provide no meaning data or return null from
+    * some APIs.
+    *
+    * @return the metrics tracker for this DataSource
+    */
+   public IMetricsTracker getMetricsTracker()
+   {
+      return (pool != null ? pool.getMetricsTracker() : null);
+   }
+
    /**
     * <code>close()</code> and <code>shutdown()</code> are synonymous.
     */

hikaricp-java6/src/main/java/com/zaxxer/hikari/metrics/CodaHaleMetricsTracker.java

@@ -24,31 +24,45 @@ import com.zaxxer.hikari.pool.HikariPool;
 public final class CodaHaleMetricsTracker extends MetricsTracker
 {
    private MetricRegistry registry;
-   private Timer connectionObtainTimer;
+   private final Timer connectionObtainTimer;
-   private Histogram connectionUsage;
+   private final Histogram connectionUsage;
 
-   public CodaHaleMetricsTracker(String poolName)
+   public CodaHaleMetricsTracker(final HikariPool pool)
    {
+      super(pool);
+
       registry = new MetricRegistry();
-      connectionObtainTimer = registry.timer(MetricRegistry.name(HikariPool.class, "connection", "wait"));
+      connectionObtainTimer = registry.timer(MetricRegistry.name(HikariPool.class, pool.getConfiguration().getPoolName() + "-connection", "wait"));
-      connectionUsage = registry.histogram(MetricRegistry.name(HikariPool.class, "connection", "usage"));
+      connectionUsage = registry.histogram(MetricRegistry.name(HikariPool.class, pool.getConfiguration().getPoolName() + "-connection", "usage"));
    }
 
+   /** {@inheritDoc} */
    @Override
    public Context recordConnectionRequest(long requestTime)
    {
       return new Context(connectionObtainTimer);
    }
 
+   /** {@inheritDoc} */
    @Override
    public void recordConnectionUsage(long usageMilleseconds)
    {
       connectionUsage.update(usageMilleseconds);
    }
 
+   public Timer getConnectionAcquisitionTimer()
+   {
+      return connectionObtainTimer;
+   }
+
+   public Histogram getConnectionDurationHistogram()
+   {
+      return connectionUsage;
+   }
+
    public static final class Context extends MetricsContext
    {
-      Timer.Context innerContext;
+      final Timer.Context innerContext;
 
       Context(Timer timer)
       {

hikaricp-java6/src/main/java/com/zaxxer/hikari/metrics/IMetricsTracker.java

@@ -30,7 +30,7 @@ public interface IMetricsTracker
     * @param startTime the timestamp of the start time as returned by System.currentTimeMillis() 
     * @return an instance of MetricsContext
     */
-   public MetricsContext recordConnectionRequest(long startTime);
+   MetricsContext recordConnectionRequest(long startTime);
 
    /**
     * This method is called when a Connection is closed, with the total time in milliseconds
@@ -38,7 +38,35 @@ public interface IMetricsTracker
     *
     * @param usageMilleseconds the Connection usage time in milliseconds
     */
-   public void recordConnectionUsage(long usageMilleseconds);
+   void recordConnectionUsage(long usageMilleseconds);
+
+   /**
+    * Get the current number of idle connections.
+    *
+    * @return the number of idle connections in the pool
+    */
+   int getIdleConnections();
+
+   /**
+    * Get the current number of active (in-use) connections.
+    *
+    * @return the number of active connections in the pool
+    */
+   int getActiveConnections();
+
+   /**
+    * Get the current total number of connections.
+    *
+    * @return the total number of connections in the pool
+    */
+   int getTotalConnections();
+
+   /**
+    * Get the current number of threads awaiting a connection.
+    *
+    * @return the number of awaiting threads
+    */
+   int getThreadsAwaitingConnection();
 
    /**
     * A base instance of a MetricsContext.  Classes extending this class should exhibit the

hikaricp-java6/src/main/java/com/zaxxer/hikari/metrics/MetricsFactory.java

@@ -16,6 +16,7 @@
 
 package com.zaxxer.hikari.metrics;
 
+import com.zaxxer.hikari.pool.HikariPool;
 import com.zaxxer.hikari.util.PoolUtilities;
 
 /**
@@ -29,8 +30,8 @@ public final class MetricsFactory
       // private contructor
    }
 
-   public static final IMetricsTracker createMetricsTracker(String metricsClassName, String poolName)
+   public static final IMetricsTracker createMetricsTracker(String metricsClassName, HikariPool pool)
    {
-      return PoolUtilities.createInstance(metricsClassName, IMetricsTracker.class, poolName);
+      return PoolUtilities.createInstance(metricsClassName, IMetricsTracker.class, pool);
    }
 }

hikaricp-java6/src/main/java/com/zaxxer/hikari/metrics/MetricsTracker.java

@@ -16,8 +16,10 @@
 
 package com.zaxxer.hikari.metrics;
 
+import com.zaxxer.hikari.pool.HikariPool;
+
 /**
- * This class does absolutely nothing.
+ * This class only supports realtime, not historical metrics.
  *
  * @author Brett Wooldridge
  */
@@ -25,20 +27,51 @@ public class MetricsTracker implements IMetricsTracker
 {
    public static final MetricsContext NO_CONTEXT = new MetricsContext();
 
-   public MetricsTracker()
+   protected final HikariPool pool;
-   {
-   }
 
-   public MetricsTracker(String poolName)
+   public MetricsTracker(final HikariPool pool)
    {
+      this.pool = pool;
    }
 
+   /** {@inheritDoc} */
+   @Override
    public MetricsContext recordConnectionRequest(long requestTime)
    {
       return NO_CONTEXT;
    }
 
+   /** {@inheritDoc} */
+   @Override
    public void recordConnectionUsage(long usageMilleseconds)
    {
    }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getIdleConnections()
+   {
+      return pool.getIdleConnections();
+   }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getActiveConnections()
+   {
+      return pool.getActiveConnections();
+   }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getTotalConnections()
+   {
+      return pool.getTotalConnections();
+   }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getThreadsAwaitingConnection()
+   {
+      return pool.getThreadsAwaitingConnection();
+   }
 }

hikaricp-java6/src/main/java/com/zaxxer/hikari/pool/HikariPool.java

@@ -134,7 +134,7 @@ public final class HikariPool implements HikariPoolMBean, IBagStateListener
       this.transactionIsolation = PoolUtilities.getTransactionIsolation(configuration.getTransactionIsolation());
       this.isRecordMetrics = configuration.isRecordMetrics();
       this.metricsTracker = MetricsFactory.createMetricsTracker((isRecordMetrics ? configuration.getMetricsTrackerClassName()
-            : "com.zaxxer.hikari.metrics.MetricsTracker"), configuration.getPoolName());
+            : "com.zaxxer.hikari.metrics.MetricsTracker"), this);
 
       this.dataSource = initializeDataSource();
 
@@ -275,6 +275,26 @@ public final class HikariPool implements HikariPoolMBean, IBagStateListener
       return dataSource;
    }
 
+   /**
+    * Get the pool configuration object.
+    *
+    * @return the {@link HikariConfig} for this pool
+    */
+   public HikariConfig getConfiguration()
+   {
+      return configuration;
+   }
+
+   /**
+    * Get the metrics tracker for this pool.
+    *
+    * @return the metrics tracker
+    */
+   public IMetricsTracker getMetricsTracker()
+   {
+      return metricsTracker;
+   }
+
    @Override
    public String toString()
    {

hikaricp/src/main/java/com/zaxxer/hikari/HikariDataSource.java

@@ -29,6 +29,7 @@ import javax.sql.DataSource;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.zaxxer.hikari.metrics.IMetricsTracker;
 import com.zaxxer.hikari.pool.HikariPool;
 import com.zaxxer.hikari.proxy.IHikariConnectionProxy;
 import com.zaxxer.hikari.util.DriverDataSource;
@@ -215,6 +216,18 @@ public class HikariDataSource extends HikariConfig implements DataSource, Closea
       }
    }
 
+   /**
+    * Get the metrics tracker associated with this DataSource.  If metrics collection is
+    * disabled, the resulting object will provide no meaning data or return null from
+    * some APIs.
+    *
+    * @return the metrics tracker for this DataSource
+    */
+   public IMetricsTracker getMetricsTracker()
+   {
+      return (pool != null ? pool.getMetricsTracker() : null);
+   }
+
    /**
     * <code>close()</code> and <code>shutdown()</code> are synonymous.
     */

hikaricp/src/main/java/com/zaxxer/hikari/metrics/CodaHaleMetricsTracker.java

@@ -27,25 +27,39 @@ public final class CodaHaleMetricsTracker extends MetricsTracker
    private final Timer connectionObtainTimer;
    private final Histogram connectionUsage;
 
-   public CodaHaleMetricsTracker(String poolName)
+   public CodaHaleMetricsTracker(final HikariPool pool)
    {
+      super(pool);
+
       registry = new MetricRegistry();
-      connectionObtainTimer = registry.timer(MetricRegistry.name(HikariPool.class, poolName + "-connection", "wait"));
+      connectionObtainTimer = registry.timer(MetricRegistry.name(HikariPool.class, pool.getConfiguration().getPoolName() + "-connection", "wait"));
-      connectionUsage = registry.histogram(MetricRegistry.name(HikariPool.class, poolName + "-connection", "usage"));
+      connectionUsage = registry.histogram(MetricRegistry.name(HikariPool.class, pool.getConfiguration().getPoolName() + "-connection", "usage"));
    }
 
+   /** {@inheritDoc} */
    @Override
    public Context recordConnectionRequest(long requestTime)
    {
       return new Context(connectionObtainTimer);
    }
 
+   /** {@inheritDoc} */
    @Override
    public void recordConnectionUsage(long usageMilleseconds)
    {
       connectionUsage.update(usageMilleseconds);
    }
 
+   public Timer getConnectionAcquisitionTimer()
+   {
+      return connectionObtainTimer;
+   }
+
+   public Histogram getConnectionDurationHistogram()
+   {
+      return connectionUsage;
+   }
+
    public static final class Context extends MetricsContext
    {
       final Timer.Context innerContext;

hikaricp/src/main/java/com/zaxxer/hikari/metrics/IMetricsTracker.java

@@ -30,7 +30,7 @@ public interface IMetricsTracker
     * @param startTime the timestamp of the start time as returned by System.currentTimeMillis() 
     * @return an instance of MetricsContext
     */
-   public MetricsContext recordConnectionRequest(long startTime);
+   MetricsContext recordConnectionRequest(long startTime);
 
    /**
     * This method is called when a Connection is closed, with the total time in milliseconds
@@ -38,7 +38,35 @@ public interface IMetricsTracker
     *
     * @param usageMilleseconds the Connection usage time in milliseconds
     */
-   public void recordConnectionUsage(long usageMilleseconds);
+   void recordConnectionUsage(long usageMilleseconds);
+
+   /**
+    * Get the current number of idle connections.
+    *
+    * @return the number of idle connections in the pool
+    */
+   int getIdleConnections();
+
+   /**
+    * Get the current number of active (in-use) connections.
+    *
+    * @return the number of active connections in the pool
+    */
+   int getActiveConnections();
+
+   /**
+    * Get the current total number of connections.
+    *
+    * @return the total number of connections in the pool
+    */
+   int getTotalConnections();
+
+   /**
+    * Get the current number of threads awaiting a connection.
+    *
+    * @return the number of awaiting threads
+    */
+   int getThreadsAwaitingConnection();
 
    /**
     * A base instance of a MetricsContext.  Classes extending this class should exhibit the

hikaricp/src/main/java/com/zaxxer/hikari/metrics/MetricsFactory.java

@@ -16,6 +16,7 @@
 
 package com.zaxxer.hikari.metrics;
 
+import com.zaxxer.hikari.pool.HikariPool;
 import com.zaxxer.hikari.util.PoolUtilities;
 
 /**
@@ -29,8 +30,8 @@ public final class MetricsFactory
       // private contructor
    }
 
-   public static final IMetricsTracker createMetricsTracker(String metricsClassName, String poolName)
+   public static final IMetricsTracker createMetricsTracker(String metricsClassName, HikariPool pool)
    {
-      return PoolUtilities.createInstance(metricsClassName, IMetricsTracker.class, poolName);
+      return PoolUtilities.createInstance(metricsClassName, IMetricsTracker.class, pool);
    }
 }

hikaricp/src/main/java/com/zaxxer/hikari/metrics/MetricsTracker.java

@@ -16,8 +16,10 @@
 
 package com.zaxxer.hikari.metrics;
 
+import com.zaxxer.hikari.pool.HikariPool;
+
 /**
- * This class does absolutely nothing.
+ * This class only supports realtime, not historical metrics.
  *
  * @author Brett Wooldridge
  */
@@ -25,20 +27,51 @@ public class MetricsTracker implements IMetricsTracker
 {
    public static final MetricsContext NO_CONTEXT = new MetricsContext();
 
-   public MetricsTracker()
+   protected final HikariPool pool;
-   {
-   }
 
-   public MetricsTracker(String poolName)
+   public MetricsTracker(final HikariPool pool)
    {
+      this.pool = pool;
    }
 
+   /** {@inheritDoc} */
+   @Override
    public MetricsContext recordConnectionRequest(long requestTime)
    {
       return NO_CONTEXT;
    }
 
+   /** {@inheritDoc} */
+   @Override
    public void recordConnectionUsage(long usageMilleseconds)
    {
    }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getIdleConnections()
+   {
+      return pool.getIdleConnections();
+   }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getActiveConnections()
+   {
+      return pool.getActiveConnections();
+   }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getTotalConnections()
+   {
+      return pool.getTotalConnections();
+   }
+
+   /** {@inheritDoc} */
+   @Override
+   public int getThreadsAwaitingConnection()
+   {
+      return pool.getThreadsAwaitingConnection();
+   }
 }

hikaricp/src/main/java/com/zaxxer/hikari/pool/HikariPool.java

@@ -133,7 +133,7 @@ public final class HikariPool implements HikariPoolMBean, IBagStateListener
       this.transactionIsolation = PoolUtilities.getTransactionIsolation(configuration.getTransactionIsolation());
       this.isRecordMetrics = configuration.isRecordMetrics();
       this.metricsTracker = MetricsFactory.createMetricsTracker((isRecordMetrics ? configuration.getMetricsTrackerClassName()
-            : "com.zaxxer.hikari.metrics.MetricsTracker"), configuration.getPoolName());
+            : "com.zaxxer.hikari.metrics.MetricsTracker"), this);
 
       this.dataSource = initializeDataSource();
 
@@ -143,7 +143,7 @@ public final class HikariPool implements HikariPoolMBean, IBagStateListener
 
       addConnectionExecutor = createThreadPoolExecutor(configuration.getMaximumPoolSize(), "HikariCP connection filler", configuration.getThreadFactory());
       closeConnectionExecutor = createThreadPoolExecutor(configuration.getMaximumPoolSize(), "HikariCP connection closer", configuration.getThreadFactory());
-      
+
       fillPool();
 
       long delayPeriod = Long.getLong("com.zaxxer.hikari.housekeeping.periodMs", TimeUnit.SECONDS.toMillis(30L));
@@ -272,6 +272,26 @@ public final class HikariPool implements HikariPoolMBean, IBagStateListener
       return dataSource;
    }
 
+   /**
+    * Get the pool configuration object.
+    *
+    * @return the {@link HikariConfig} for this pool
+    */
+   public HikariConfig getConfiguration()
+   {
+      return configuration;
+   }
+
+   /**
+    * Get the metrics tracker for this pool.
+    *
+    * @return the metrics tracker
+    */
+   public IMetricsTracker getMetricsTracker()
+   {
+      return metricsTracker;
+   }
+
    @Override
    public String toString()
    {