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;; JMX client APIs for Clojure
;; docs in clojure/contrib/jmx.clj!!
;; by Stuart Halloway
;; Copyright (c) Stuart Halloway, 2009. All rights reserved. The use
;; and distribution terms for this software are covered by the Eclipse
;; Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;; which can be found in the file epl-v10.html at the root of this
;; distribution. By using this software in any fashion, you are
;; agreeing to be bound by the terms of this license. You must not
;; remove this notice, or any other, from this software.
(in-ns 'clojure.contrib.jmx)
; TODO: needs an integration test
; TODO: why full package needed for JMXConnectorFactory?
(defmacro with-connection
"Execute body with JMX connection specified by opts (:port)."
[opts & body]
`(with-open [connector# (javax.management.remote.JMXConnectorFactory/connect
(JMXServiceURL. (jmx-url ~opts)) {})]
(binding [*connection* (.getMBeanServerConnection connector#)]
~@body)))
(defn mbean-info [n]
(.getMBeanInfo *connection* (as-object-name n)))
(defn raw-read
"Read an mbean property. Returns low-level Java object model for composites, tabulars, etc.
Most callers should use read."
[n attr]
(.getAttribute *connection* (as-object-name n) (as-str attr)))
(defvar read
(comp jmx->clj raw-read)
"Read an mbean property.")
(defvar read-exceptions
[UnsupportedOperationException
InternalError
java.io.NotSerializableException
java.lang.ClassNotFoundException
javax.management.AttributeNotFoundException]
"Exceptions that might be thrown if you try to read an unsupported attribute.
by testing agains jconsole and Tomcat. This is dreadful and ad-hoc but I did not
want to swallow all exceptions.")
(defn read-supported
"Calls read to read an mbean property, *returning* unsupported operation exceptions instead of throwing them.
Used to keep mbean from blowing up. Note that some terribly-behaved mbeans use java.lang.InternalError to
indicate an unsupported operation!"
[n attr]
(try
(read n attr)
(catch Throwable t
(let [cause (root-cause t)]
(if (some #(instance? % cause) read-exceptions)
cause
(throw t))))))
(defn write! [n attr value]
(.setAttribute
*connection*
(as-object-name n)
(Attribute. (as-str attr) value)))
(defn attribute-info
"Get the MBeanAttributeInfo for an attribute"
[object-name attr-name]
(filter #(= (as-str attr-name) (.getName %))
(.getAttributes (mbean-info object-name))))
(defn readable?
"Is attribute readable?"
[n attr]
(.isReadable () (mbean-info n)))
(defn operations
"All oeprations available on an MBean."
[n]
(.getOperations (mbean-info n)))
(defn operation
"The MBeanOperationInfo for operation op on mbean n. Used for invoke."
[n op]
(first (filter #(= (-> % .getName keyword) op) (operations n))))
(defn op-param-types
"The parameter types (as class name strings) for operation op on n. Used for invoke."
[n op]
(map #(-> % .getType) (.getSignature (operation n op))))
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