From 35e66cd7a92df7f17808b08f1581210491339d0f Mon Sep 17 00:00:00 2001
From: Florian Forster <octo@noris.net>
Date: Wed, 16 Jun 2010 15:36:04 +0200
Subject: [PATCH] GenericJMX plugin: Implement the "InstancePrefix" option in
 "Connection" blocks.

---
 .../collectd/java/GenericJMXConfConnection.java    | 12 +++++-
 .../org/collectd/java/GenericJMXConfMBean.java     | 44 ++++++++++------------
 src/collectd-java.pod                              |  8 ++++
 3 files changed, 37 insertions(+), 27 deletions(-)

diff --git a/bindings/java/org/collectd/java/GenericJMXConfConnection.java b/bindings/java/org/collectd/java/GenericJMXConfConnection.java
index ffa9ded4..0c81bc9a 100644
--- a/bindings/java/org/collectd/java/GenericJMXConfConnection.java
+++ b/bindings/java/org/collectd/java/GenericJMXConfConnection.java
@@ -1,6 +1,6 @@
 /*
  * collectd/java - org/collectd/java/GenericJMXConfConnection.java
- * Copyright (C) 2009  Florian octo Forster
+ * Copyright (C) 2009,2010  Florian octo Forster
  *
  * 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
@@ -45,6 +45,7 @@ class GenericJMXConfConnection
   private String _username = null;
   private String _password = null;
   private String _host = null;
+  private String _instance_prefix = null;
   private String _service_url = null;
   private MBeanServerConnection _jmx_connection = null;
   private List<GenericJMXConfMBean> _mbeans = null;
@@ -162,6 +163,12 @@ private void connect () /* {{{ */
         if (tmp != null)
           this._service_url = tmp;
       }
+      else if (child.getKey ().equalsIgnoreCase ("InstancePrefix"))
+      {
+        String tmp = getConfigString (child);
+        if (tmp != null)
+          this._instance_prefix = tmp;
+      }
       else if (child.getKey ().equalsIgnoreCase ("Collect"))
       {
         String tmp = getConfigString (child);
@@ -211,7 +218,8 @@ private void connect () /* {{{ */
     {
       int status;
 
-      status = this._mbeans.get (i).query (this._jmx_connection, pd);
+      status = this._mbeans.get (i).query (this._jmx_connection, pd,
+          this._instance_prefix);
       if (status != 0)
       {
         this._jmx_connection = null;
diff --git a/bindings/java/org/collectd/java/GenericJMXConfMBean.java b/bindings/java/org/collectd/java/GenericJMXConfMBean.java
index 1587bd5f..b1fbfb3e 100644
--- a/bindings/java/org/collectd/java/GenericJMXConfMBean.java
+++ b/bindings/java/org/collectd/java/GenericJMXConfMBean.java
@@ -1,6 +1,6 @@
 /*
  * collectd/java - org/collectd/java/GenericJMXConfMBean.java
- * Copyright (C) 2009  Florian octo Forster
+ * Copyright (C) 2009,2010  Florian octo Forster
  *
  * 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
@@ -67,22 +67,6 @@ class GenericJMXConfMBean
     return (v.getString ());
   } /* }}} String getConfigString */
 
-  private String join (String separator, List<String> list) /* {{{ */
-  {
-    StringBuffer sb;
-
-    sb = new StringBuffer ();
-
-    for (int i = 0; i < list.size (); i++)
-    {
-      if (i > 0)
-        sb.append ("-");
-      sb.append (list.get (i));
-    }
-
-    return (sb.toString ());
-  } /* }}} String join */
-
 /*
  * <MBean "alias name">
  *   ObjectName "object name"
@@ -170,7 +154,8 @@ class GenericJMXConfMBean
     return (this._name);
   } /* }}} */
 
-  public int query (MBeanServerConnection conn, PluginData pd) /* {{{ */
+  public int query (MBeanServerConnection conn, PluginData pd, /* {{{ */
+      String instance_prefix)
   {
     Set<ObjectName> names;
     Iterator<ObjectName> iter;
@@ -197,11 +182,12 @@ class GenericJMXConfMBean
       ObjectName   objName;
       PluginData   pd_tmp;
       List<String> instanceList;
-      String       instance;
+      StringBuffer instance;
 
       objName      = iter.next ();
       pd_tmp       = new PluginData (pd);
       instanceList = new ArrayList<String> ();
+      instance     = new StringBuffer ();
 
       Collectd.logDebug ("GenericJMXConfMBean: objName = "
           + objName.toString ());
@@ -224,14 +210,22 @@ class GenericJMXConfMBean
         }
       }
 
+      if (instance_prefix != null)
+        instance.append (instance_prefix);
+
       if (this._instance_prefix != null)
-        instance = new String (this._instance_prefix
-            + join ("-", instanceList));
-      else
-        instance = join ("-", instanceList);
-      pd_tmp.setPluginInstance (instance);
+        instance.append (this._instance_prefix);
+
+      for (int i = 0; i < instanceList.size (); i++)
+      {
+        if (i > 0)
+          instance.append ("-");
+        instance.append (instanceList.get (i));
+      }
+
+      pd_tmp.setPluginInstance (instance.toString ());
 
-      Collectd.logDebug ("GenericJMXConfMBean: instance = " + instance);
+      Collectd.logDebug ("GenericJMXConfMBean: instance = " + instance.toString ());
 
       for (int i = 0; i < this._values.size (); i++)
         this._values.get (i).query (conn, objName, pd_tmp);
diff --git a/src/collectd-java.pod b/src/collectd-java.pod
index 9c0c6eba..9e2f81aa 100644
--- a/src/collectd-java.pod
+++ b/src/collectd-java.pod
@@ -667,6 +667,14 @@ will be used.
 Use I<password> to authenticate to the server. If not given, unauthenticated
 access is used.
 
+=item B<InstancePrefix> I<prefix>
+
+Prefixes the generated I<plugin instance> with I<prefix>. If a second
+I<InstancePrefix> is specified in a referenced I<MBean> block, the prefix
+specified in the I<Connection> block will appear at the beginning of the
+I<plugin instance>, the prefix specified in the I<MBean> block will be appended
+to it.
+
 =item B<Collect> I<mbean_block_name>
 
 Configures which of the I<MBean> blocks to use with this connection. May be
-- 
2.11.0