Default truncation length for trunc.

Just like defn but create an atom instance used to generate the result (resource) by calling body only once.

This creates a function name that invokes body the first time it is invoked. It then caches the solution and returns it on the next call. This is all done in a clojure.core/locking lexical context to make this first call and resource creation thread-safe.

The result it saves is kept in the metadata under key :init-resource.

Create a function called name that pools objects. The pool resources are bound to item-symbol and created with function factory-fn. The config parameter determines how pooling is done with the following default configuration:

{:max-total -1
 :max-idle 8
 :min-idle 0}

Note: The configuration form is optional.

Example

(defnpool pool1 [pooled-item
                 #(java.util.Date.)
                 {:max-total 5}]
  [arg1]
  (str pooled-item arg1))

Creates a function pool that takes one argument (arg), binds pooled items to pool-item with new instances of java.util.Date and has a max pool size of 5. The output appends the date to the passed argument.

See the underlying Java API for more information.

Just like defn but call body in a clojure.core/locking lexical context to make this first call and resource creation thread-safe. Subsequent calls only use the monitor to check if the resource has body been called once.

This creates a function name that invokes body the first time it is invoked. It then caches the solution and returns it on the next call.

The result it saves is kept in the metadata under key :init-resource.

Return statistics on the pool-fn-var. A var (not a symbole) needs to be passed, which look something like '#my-pol-fn for pool-fn-var.

Truncate string obj at len characters adding ellipses if larger that a set length. If obj isn’t a string use pr-str to make it a string.

See *trunc-len*.

Execute body and timeout after timeout-millis milliseconds.

If the execution times out java.util.concurrent.TimeoutException is thrown.