From 0c8f43abea3c0c190653b46cc1aa24c00486ae4d Mon Sep 17 00:00:00 2001
From: Bryan Varner <bvarner@polarislabs.com>
Date: Mon, 15 Oct 2012 15:51:49 -0400
Subject: [PATCH] Change how mBeans names are generated to include the data
 source name in the attributes (if it has a name)

This allows you to query mbeans by stable name patterns, allowing for reliable instrumentation via JMX between VM instances.

I currently use these patches in production (nearly 18 months) to grab pool telemetry with collectd's JMX probe.
---
 .../impl/PoolBackedDataSourceBase.beangen-xml |  1 +
 .../ActiveManagementCoordinator.java          |  2 +-
 .../DynamicPooledDataSourceManagerMBean.java  | 22 ++++++++++++++-----
 3 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/src/codegen/com/mchange/v2/c3p0/impl/PoolBackedDataSourceBase.beangen-xml b/src/codegen/com/mchange/v2/c3p0/impl/PoolBackedDataSourceBase.beangen-xml
index da21ada6..e6dede97 100644
--- a/src/codegen/com/mchange/v2/c3p0/impl/PoolBackedDataSourceBase.beangen-xml
+++ b/src/codegen/com/mchange/v2/c3p0/impl/PoolBackedDataSourceBase.beangen-xml
@@ -52,6 +52,7 @@
     <property>
        <type>String</type>
        <name>dataSourceName</name>
+       <bound/>
        <default-value>null</default-value>
        <getter><modifiers><modifier>public</modifier><modifier>synchronized</modifier></modifiers></getter>
        <setter><modifiers><modifier>public</modifier><modifier>synchronized</modifier></modifiers></setter>
diff --git a/src/java/com/mchange/v2/c3p0/management/ActiveManagementCoordinator.java b/src/java/com/mchange/v2/c3p0/management/ActiveManagementCoordinator.java
index 576e68e4..08ce4ef5 100644
--- a/src/java/com/mchange/v2/c3p0/management/ActiveManagementCoordinator.java
+++ b/src/java/com/mchange/v2/c3p0/management/ActiveManagementCoordinator.java
@@ -146,6 +146,6 @@ public void attemptUnmanagePooledDataSource(PooledDataSource pds)
     }
     
     private String getPdsObjectNameStr(PooledDataSource pds)
-    { return "com.mchange.v2.c3p0:type=PooledDataSource[" + pds.getIdentityToken() + "]"; }
+    { return "com.mchange.v2.c3p0:type=PooledDataSource,identityToken=" + pds.getIdentityToken(); }
 }
 
diff --git a/src/java/com/mchange/v2/c3p0/management/DynamicPooledDataSourceManagerMBean.java b/src/java/com/mchange/v2/c3p0/management/DynamicPooledDataSourceManagerMBean.java
index 653f26b5..e266abef 100644
--- a/src/java/com/mchange/v2/c3p0/management/DynamicPooledDataSourceManagerMBean.java
+++ b/src/java/com/mchange/v2/c3p0/management/DynamicPooledDataSourceManagerMBean.java
@@ -43,6 +43,7 @@
 import javax.management.MBeanParameterInfo;
 import javax.management.MBeanServer;
 import javax.management.ObjectName;
+import javax.management.ObjectInstance;
 import javax.management.ReflectionException;
 import javax.sql.ConnectionPoolDataSource;
 import javax.sql.DataSource;
@@ -120,6 +121,7 @@ public class DynamicPooledDataSourceManagerMBean implements DynamicMBean
 
     PooledDataSource pds;
     String mbeanName;
+    String oldPdsName;
     MBeanServer mbs;
     
     ConnectionPoolDataSource cpds;
@@ -137,8 +139,14 @@ public void propertyChange(PropertyChangeEvent evt)
             String propName = evt.getPropertyName();
             Object val = evt.getNewValue();
 
-            if ("nestedDataSource".equals(propName) || "connectionPoolDataSource".equals(propName))
+            if ("nestedDataSource".equals(propName) || "connectionPoolDataSource".equals(propName)) {
                 reinitialize();
+            } else if ("dataSourceName".equals(propName)) {
+                if (evt.getOldValue() != null) {
+                    oldPdsName = evt.getOldValue().toString();
+                }
+                reinitialize();
+           }
         }
     };
 
@@ -147,10 +155,11 @@ public DynamicPooledDataSourceManagerMBean(PooledDataSource pds, String mbeanNam
     { 
         this.pds = pds; 
         this.mbeanName = mbeanName;
+	this.oldPdsName = pds.getDataSourceName();
         this.mbs = mbs;
         
         if (pds instanceof ComboPooledDataSource)
-            /* do nothing */;
+            ((ComboPooledDataSource) pds).addPropertyChangeListener(pcl);
         else if (pds instanceof AbstractPoolBackedDataSource)
             ((AbstractPoolBackedDataSource) pds).addPropertyChangeListener(pcl);
         else
@@ -224,17 +233,18 @@ private synchronized Exception reinitialize()
             // that the MBeanInfo is reread.
             try
             {
-                ObjectName oname = ObjectName.getInstance( mbeanName );
+                ObjectName oname = ObjectName.getInstance( mbeanName + ",name=" + oldPdsName );
                 if (mbs.isRegistered( oname ))
                 {
                     mbs.unregisterMBean( oname );
                     if (logger.isLoggable(MLevel.FINER))
-                        logger.log(MLevel.FINER, "MBean: " + mbeanName + " unregistered, in order to be reregistered after update.");
+                        logger.log(MLevel.FINER, "MBean: " + oname.toString() + " unregistered, in order to be reregistered after update.");
                 }
+		oname = ObjectName.getInstance(mbeanName + ",name=" + pds.getDataSourceName());
                 mbs.registerMBean( this, oname );
                 if (logger.isLoggable(MLevel.FINER))
-                    logger.log(MLevel.FINER, "MBean: " + mbeanName + " registered.");
-                
+                    logger.log(MLevel.FINER, "MBean: " + oname.toString() + " registered.");
+		
                 return null;
             }
             catch (Exception e)