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<h1 class="nopad">Table of Contents</h1>
<div style="margin-left: 1em;" class="toc-section">
<a href="#toc0">Overview</a>
<div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/*allow-direct-logging*">*allow-direct-logging*</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/*impl-name*">*impl-name*</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/*logging-agent*">*logging-agent*</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/agent-write!">agent-write!</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/debug">debug</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/enabled?">enabled?</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/error">error</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/fatal">fatal</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/impl-enabled?">impl-enabled?</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/impl-get-log">impl-get-log</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/impl-write!">impl-write!</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/info">info</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/log">log</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/log-capture!">log-capture!</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/log-stream">log-stream</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/log-uncapture!">log-uncapture!</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/spy">spy</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/trace">trace</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/warn">warn</a>
</div><div style="margin-left: 1em;" class="toc-entry">
<a href="#clojure.contrib.logging/with-logs">with-logs</a>
</div>
<br />
</div>
</div>
</div>
<div id="content-tag"><h1 id="overview">API for <span id="namespace-name">logging</span>
<span id="branch-name">(1.1.x branch)</span></h1>
by <span id="author">Alex Taggart, Timothy Pratley</span><br />
<br />Usage:
<pre>
(ns your-namespace
(:require <span id="long-name">clojure.contrib.logging</span>))
</pre><pre>
</pre><h2>Overview</h2>
<pre id="namespace-docstr">Logging macros which delegate to a specific logging implementation. At
macro-expansion-time a specific implementation is selected from, in order,
Apache commons-logging, log4j, and finally java.util.logging.
Logging levels are specified by clojure keywords corresponding to the
values used in log4j and commons-logging:
:trace, :debug, :info, :warn, :error, :fatal
Logging occurs with the log macro, or the level-specific convenience macros,
which write either directly or via an agent. For performance reasons, direct
logging is enabled by default, but setting the *allow-direct-logging* boolean
atom to false will disable it. If logging is invoked within a transaction it
will always use an agent.
The log macros will not evaluate their 'message' unless the specific logging
level is in effect. Alternately, you can use the spy macro when you have code
that needs to be evaluated, and also want to output the code and its result to
the debug log.
Unless otherwise specified, the current namespace (as identified by *ns*) will
be used as the log-ns (similar to how the java class name is usually used).
Note: your log configuration should display the name that was passed to the
logging implementation, and not perform stack-inspection, otherwise you'll see
something like "fn__72$impl_write_BANG__39__auto____81" in your logs.
Use the enabled? macro to write conditional code against the logging level
(beyond simply whether or not to call log, which is handled automatically).
You can redirect all java writes of System.out and System.err to the log
system by calling log-capture!. To rebind *out* and *err* to the log system
invoke with-logs. In both cases a log-ns (e.g., "com.example.captured")
needs to be specified to namespace the output.</pre>
<br />
<h2>Public Variables and Functions</h2>
<div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/*allow-direct-logging*">*allow-direct-logging*</h2>
<span id="var-type">var</span><br />
<pre id="var-usage"></pre>
<pre id="var-docstr">A boolean indicating whether direct logging (as opposed to via an agent) is
allowed when not operating from within a transaction. Defaults to true.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L202" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/*impl-name*">*impl-name*</h2>
<span id="var-type">var</span><br />
<pre id="var-usage"></pre>
<pre id="var-docstr">The name of the logging implementation used.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L190" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/*logging-agent*">*logging-agent*</h2>
<span id="var-type">var</span><br />
<pre id="var-usage"></pre>
<pre id="var-docstr">The default agent used for performing logging durng a transaction or when
direct logging is disabled.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L196" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/agent-write!">agent-write!</h2>
<span id="var-type">function</span><br />
<pre id="var-usage">Usage: (agent-write! _ log level message throwable)
</pre>
<pre id="var-docstr">Writes the message immediately, and ignores the first argument. Used by the
logging agent. End-users should never need to call this function.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L208" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/debug">debug</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (debug message)
(debug message throwable)
</pre>
<pre id="var-docstr">Logs a message at the debug level.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L316" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/enabled?">enabled?</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (enabled? level)
(enabled? level log-ns)
</pre>
<pre id="var-docstr">Returns true if the specific logging level is enabled. Use of this function
should only be necessary if one needs to execute alternate code paths beyond
whether the log should be written to.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L232" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/error">error</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (error message)
(error message throwable)
</pre>
<pre id="var-docstr">Logs a message at the error level.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L337" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/fatal">fatal</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (fatal message)
(fatal message throwable)
</pre>
<pre id="var-docstr">Logs a message at the fatal level.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L344" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/impl-enabled?">impl-enabled?</h2>
<span id="var-type">var</span><br />
<pre id="var-usage"></pre>
<pre id="var-docstr">Implementation-specific check if a particular level is enabled. End-users
should not need to call this function.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L190" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/impl-get-log">impl-get-log</h2>
<span id="var-type">var</span><br />
<pre id="var-usage"></pre>
<pre id="var-docstr">Returns an implementation-specific log by string namespace. End-users should
not need to call this function.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L190" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/impl-write!">impl-write!</h2>
<span id="var-type">var</span><br />
<pre id="var-usage"></pre>
<pre id="var-docstr">Implementation-specific write of a log message. End-users should not need to
call this function.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L190" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/info">info</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (info message)
(info message throwable)
</pre>
<pre id="var-docstr">Logs a message at the info level.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L323" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/log">log</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (log level message)
(log level message throwable)
(log level message throwable log-ns)
</pre>
<pre id="var-docstr">Logs a message, either directly or via an agent. Also see the level-specific
convenience macros.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L215" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/log-capture!">log-capture!</h2>
<span id="var-type">function</span><br />
<pre id="var-usage">Usage: (log-capture! log-ns)
</pre>
<pre id="var-docstr">Captures System.out and System.err, redirecting all writes of those streams
to :info and :error logging, respectively. The specified log-ns value will
be used to namespace all redirected logging. NOTE: this will not redirect
output of *out* or *err*; for that, use with-logs.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L271" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/log-stream">log-stream</h2>
<span id="var-type">function</span><br />
<pre id="var-usage">Usage: (log-stream level log-ns)
</pre>
<pre id="var-docstr">Creates a PrintStream that will output to the log. End-users should not need
to invoke this function.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L249" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/log-uncapture!">log-uncapture!</h2>
<span id="var-type">function</span><br />
<pre id="var-usage">Usage: (log-uncapture!)
</pre>
<pre id="var-docstr">Restores System.out and System.err to their original values.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L287" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/spy">spy</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (spy expr)
</pre>
<pre id="var-docstr">Evaluates expr and outputs the form and its result to the debug log; returns
the result of expr.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L242" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/trace">trace</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (trace message)
(trace message throwable)
</pre>
<pre id="var-docstr">Logs a message at the trace level.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L309" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/warn">warn</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (warn message)
(warn message throwable)
</pre>
<pre id="var-docstr">Logs a message at the warn level.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L330" id="var-source">Source</a>
</div><div id="var-entry">
<br />
<hr />
<h2 id="clojure.contrib.logging/with-logs">with-logs</h2>
<span id="var-type">macro</span><br />
<pre id="var-usage">Usage: (with-logs log-ns & body)
</pre>
<pre id="var-docstr">Evaluates exprs in a context in which *out* and *err* are bound to :info and
:error logging, respectively. The specified log-ns value will be used to
namespace all redirected logging.</pre>
<a href="http://github.com/richhickey/clojure-contrib/blob/cd69d778f5a08810d4b934dbfc08f400ed34146a/src/clojure/contrib/logging.clj#L297" id="var-source">Source</a>
</div>
</div>
</div>
</div>
</div>
</div>
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<div style="text-align: center;" id="copyright">Copyright 2007-2009 by Rich Hickey and the various contributors</div>
</div>
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<div id="DesignedBy">Logo & site design by <a title="Visit Tom Hickey's website." href="http://www.tomhickey.com">Tom Hickey</a>.<br />
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