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API for jmx - clojure-contrib v1.2 (stable)

by Stuart Halloway
Full namespace name: clojure.contrib.jmx

Overview

JMX support for Clojure

Requires post-Clojure 1.0 git edge for clojure.test, clojure.backtrace.
This is prerelease.
This API will change.
Send reports to stu@thinkrelevance.com.

Usage
  (require '[clojure.contrib.jmx :as jmx])

What beans do I have?

  (jmx/mbean-names "*:*")
  -> #<HashSet [java.lang:type=MemoryPool,name=CMS Old Gen, 
                java.lang:type=Memory, ...]

What attributes does a bean have?

  (jmx/attribute-names "java.lang:type=Memory")
  -> (:Verbose :ObjectPendingFinalizationCount 
      :HeapMemoryUsage :NonHeapMemoryUsage)

What is the value of an attribute? 

  (jmx/read "java.lang:type=Memory" :ObjectPendingFinalizationCount)
  -> 0

Can't I just have *all* the attributes in a Clojure map?

  (jmx/mbean "java.lang:type=Memory")
  -> {:NonHeapMemoryUsage
       {:used 16674024, :max 138412032, :init 24317952, :committed 24317952},
      :HeapMemoryUsage
       {:used 18619064, :max 85393408, :init 0, :committed 83230720},
      :ObjectPendingFinalizationCount 0,
      :Verbose false}

Can I find and invoke an operation?

  (jmx/operation-names "java.lang:type=Memory")
  -> (:gc)  
  (jmx/invoke "java.lang:type=Memory" :gc)
  -> nil

What about some other process? Just run *any* of the above code
inside a with-connection:

  (jmx/with-connection {:host "localhost", :port 3000} 
    (jmx/mbean "java.lang:type=Memory"))
  -> {:ObjectPendingFinalizationCount 0, 
      :HeapMemoryUsage ... etc.}

Can I serve my own beans?  Sure, just drop a Clojure ref
into an instance of clojure.contrib.jmx.Bean, and the bean
will expose read-only attributes for every key/value pair
in the ref:

  (jmx/register-mbean
     (Bean.
     (ref {:string-attribute "a-string"}))
     "my.namespace:name=Value")

Public Variables and Functions


*connection*

var

  
The connection to be used for JMX ops. Defaults to the local process.

  
  
  Source


  

  

  
as-object-name

  multimethod

  
Usage: (as-object-name string-or-name)


  
Interpret an object as a JMX ObjectName.

  
  
  Source


  

  

  
attribute-info

  function

  
Usage: (attribute-info object-name attr-name)


  
Get the MBeanAttributeInfo for an attribute.

  
  
  Source


  

  

  
attribute-names

  function

  
Usage: (attribute-names n)


  
All attribute names available on an MBean.

  
  
  Source


  

  

  
build-attribute-info

  function

  
Usage: (build-attribute-info attr-name attr-value)
       (build-attribute-info name type desc readable? writable? is?)


  
Construct an MBeanAttributeInfo. Normally called with a key/value pair from a Clojure map.

  
  
  Source


  

  

  
guess-attribute-typename

  function

  
Usage: (guess-attribute-typename value)


  
Guess the attribute typename for MBeanAttributeInfo based on the attribute value.

  
  
  Source


  

  

  
jmx->clj

  multimethod

  
No usage documentation available

  
Coerce JMX data structures into Clojure data.
Handles CompositeData, TabularData, maps, and atoms.

  
  
  Source


  

  

  
jmx-url

  function

  
Usage: (jmx-url)
       (jmx-url overrides)


  
Build a JMX URL from options.

  
  
  Source


  

  

  
map->attribute-infos

  function

  
Usage: (map->attribute-infos attr-map)


  
Construct an MBeanAttributeInfo[] from a Clojure associative.

  
  
  Source


  

  

  
maybe-atomize

  function

  
Usage: (maybe-atomize k)


  
Convert a list of length 1 into its contents, leaving other things alone.
Used to simplify keys in the tabular data API.

  
  
  Source


  

  

  
maybe-keywordize

  function

  
Usage: (maybe-keywordize s)


  
Convert a string key to a keyword, leaving other types alone. Used to
simplify keys in the tabular data API.

  
  
  Source


  

  

  
mbean

  function

  
Usage: (mbean n)


  
Like clojure.core/bean, but for JMX beans. Returns a read-only map of
a JMX bean's attributes. If an attribute it not supported, value is
set to the exception thrown.

  
  
  Source


  

  

  
mbean-names

  function

  
Usage: (mbean-names n)


  
Finds all MBeans matching a name on the current *connection*.

  
  
  Source


  

  

  
op-param-types

  function

  
Usage: (op-param-types n op)


  
The parameter types (as class name strings) for operation op on n.
Used for invoke.

  
  
  Source


  

  

  
operation

  function

  
Usage: (operation n op)


  
The MBeanOperationInfo for operation op on mbean n. Used by invoke.

  
  
  Source


  

  

  
operation-names

  function

  
Usage: (operation-names n)


  
All operation names available on an MBean.

  
  
  Source


  

  

  
operations

  function

  
Usage: (operations n)


  
All oeprations available on an MBean.

  
  
  Source


  

  

  
raw-read

  function

  
Usage: (raw-read n attr)


  
Read an mbean property. Returns low-level Java object model for
composites, tabulars, etc. Most callers should use read.

  
  
  Source


  

  

  
read

  var

  

  
Read an mbean property.

  
  
  Source


  

  

  
read-supported

  function

  
Usage: (read-supported n attr)


  
Calls read to read an mbean property, *returning* unsupported
operation exceptions instead of throwing them. Used to keep mbean
from blowing up. Note: There is no good exception that aggregates
unsupported operations, hence the overly-general catch block.

  
  
  Source


  

  

  
readable?

  function

  
Usage: (readable? n attr)


  
Is attribute readable?

  
  
  Source


  

  

  
with-connection

  macro

  
Usage: (with-connection opts & body)


  
Execute body with JMX connection specified by opts. opts can also
include an optional :environment key which is passed as the
environment arg to JMXConnectorFactory/connect.

  
  
  Source






              

            

          

	

	
      

      
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