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API for condition (1.1.x branch)

by Stephen C. Gilardi

Usage: 
(ns your-namespace
  (:require clojure.contrib.condition))

Overview


Flexible raising and handling of conditions:

Functions:

              raise: raises a condition
       handler-case: dispatches raised conditions to appropriate handlers
  print-stack-trace: prints abbreviated or full condition stack traces

Data:

  A condition is a map containing values for these keys:

    - :type, a condition type specifier, typically a keyword
    - :stack-trace, a stack trace to the site of the raise
    - :message, a human-readable message (optional)
    - :cause, a wrapped exception or condition (optional)
    - other keys given as arguments to raise (optional)

Note: requires AOT compilation.

Based on an idea from Chouser:
http://groups.google.com/group/clojure/browse_frm/thread/da1285c538f22bb5






Public Variables and Functions



  

  

  
*full-stack-traces*

  var

  

  
Bind to true to include clojure.{core,lang,main} frames in stack
traces

  
  
  Source


  

  

  
handler-case

  macro

  
Usage: (handler-case dispatch-fn & body)


  
Executes body in a context where raised conditions can be handled.

dispatch-fn accepts a raised condition (a map) and returns a selector
used to choose a handler. Commonly, dispatch-fn will be :type to dispatch
on the condition's :type value.

Handlers are forms within body:

  (handle key
    ...)

If a condition is raised, executes the body of the first handler whose
key satisfies (isa? selector key). If no handlers match, re-raises the
condition.

While a handler is running, *condition* is bound to the condition being
handled and *selector* is bound to to the value returned by dispatch-fn
that matched the handler's key.

  
  
  Source


  

  

  
print-stack-trace

  function

  
Usage: (print-stack-trace x)


  
Prints a stack trace for a condition or Throwable. Skips frames for
classes in clojure.{core,lang,main} unless the *full-stack-traces* is
bound to logical true

  
  
  Source


  

  

  
raise

  macro

  
Usage: (raise)
       (raise m)
       (raise key val & keyvals)


  
Raises a condition. With no arguments, re-raises the current condition.
With one argument (a map), raises the argument. With two or more
arguments, raises a map with keys and values from the arguments.

  
  
  Source


  

  

  
stack-trace-info

  multimethod

  
No usage documentation available

  
Returns header, stack-trace, and cause info from conditions and
Throwables

  
  
  Source



condition.Condition









  

  
-init

  function

  
Usage: (-init condition)


  
Constructs a Condition object with condition (a map) as its
metadata. Also initializes the superclass with the values at :message
and :cause, if any, so they are also available via .getMessage and
.getCause.

  
  
  Source


  

  
-meta

  function

  
Usage: (-meta this)


  
Returns this object's metadata, the condition

  
  
  Source


  

  
-post-init

  function

  
Usage: (-post-init this condition)


  
Adds :stack-trace to the condition. Drops the bottom 3 frames because
they are always the same: implementation details of Condition and raise.

  
  
  Source






              

            

          

	

	
      

      
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