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<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Dummy (trace.Trace_subscriber.Callbacks.Dummy)</title><meta charset="utf-8"/><link rel="stylesheet" href="../../../../_odoc-theme/odoc.css"/><meta name="generator" content="odoc 3.1.0"/><meta name="viewport" content="width=device-width,initial-scale=1.0"/><script src="../../../../highlight.pack.js"></script><script>hljs.initHighlightingOnLoad();</script></head><body class="odoc"><nav class="odoc-nav"><a href="../index.html">Up</a> – <a href="../../../../index.html">Index</a> » <a href="../../../index.html">trace</a> » <a href="../../index.html">Trace_subscriber</a> » <a href="../index.html">Callbacks</a> » Dummy</nav><header class="odoc-preamble"><h1>Module <code><span>Callbacks.Dummy</span></code></h1><p>Dummy callbacks. It can be useful to reuse some of these functions in a real subscriber that doesn't want to handle <b>all</b> events, but only some of them.</p><p>To write a subscriber that only supports some callbacks, this can be handy:</p><pre class="language-ocaml"><code> module My_callbacks = struct
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type st = my_own_state
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include Callbacks.Dummy
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let on_counter (st:st) ~time_ns ~tid ~data ~name v : unit = ...
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end</code></pre></header><div class="odoc-content"><div class="odoc-spec"><div class="spec value anchored" id="val-on_init"><a href="#val-on_init" class="anchor"></a><code><span><span class="keyword">val</span> on_init : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_shutdown"><a href="#val-on_shutdown" class="anchor"></a><code><span><span class="keyword">val</span> on_shutdown : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_name_thread"><a href="#val-on_name_thread" class="anchor"></a><code><span><span class="keyword">val</span> on_name_thread : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> <span><span class="label">tid</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span> <span><span class="label">name</span>:<span class="type-var">'d</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_name_process"><a href="#val-on_name_process" class="anchor"></a><code><span><span class="keyword">val</span> on_name_process : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> <span><span class="label">tid</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span> <span><span class="label">name</span>:<span class="type-var">'d</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_message"><a href="#val-on_message" class="anchor"></a><code><span><span class="keyword">val</span> on_message : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> <span><span class="label">tid</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span> <span><span class="label">span</span>:<span class="type-var">'d</span> <span class="arrow">-></span></span> <span><span class="label">data</span>:<span class="type-var">'e</span> <span class="arrow">-></span></span> <span><span class="type-var">'f</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_counter"><a href="#val-on_counter" class="anchor"></a><code><span><span class="keyword">val</span> on_counter : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> <span><span class="label">tid</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span> <span><span class="label">data</span>:<span class="type-var">'d</span> <span class="arrow">-></span></span> <span><span class="label">name</span>:<span class="type-var">'e</span> <span class="arrow">-></span></span> <span><span class="type-var">'f</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_enter_span"><a href="#val-on_enter_span" class="anchor"></a><code><span><span class="keyword">val</span> on_enter_span :
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<span><span class="type-var">'a</span> <span class="arrow">-></span></span>
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<span><span class="label">__FUNCTION__</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span>
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<span><span class="label">__FILE__</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span>
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<span><span class="label">__LINE__</span>:<span class="type-var">'d</span> <span class="arrow">-></span></span>
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<span><span class="label">time_ns</span>:<span class="type-var">'e</span> <span class="arrow">-></span></span>
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<span><span class="label">tid</span>:<span class="type-var">'f</span> <span class="arrow">-></span></span>
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<span><span class="label">data</span>:<span class="type-var">'g</span> <span class="arrow">-></span></span>
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<span><span class="label">name</span>:<span class="type-var">'h</span> <span class="arrow">-></span></span>
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<span><span class="type-var">'i</span> <span class="arrow">-></span></span>
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unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_exit_span"><a href="#val-on_exit_span" class="anchor"></a><code><span><span class="keyword">val</span> on_exit_span : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> <span><span class="label">tid</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span> <span><span class="type-var">'d</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_add_data"><a href="#val-on_add_data" class="anchor"></a><code><span><span class="keyword">val</span> on_add_data : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">data</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> <span><span class="type-var">'c</span> <span class="arrow">-></span></span> unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_enter_manual_span"><a href="#val-on_enter_manual_span" class="anchor"></a><code><span><span class="keyword">val</span> on_enter_manual_span :
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<span><span class="type-var">'a</span> <span class="arrow">-></span></span>
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<span><span class="label">__FUNCTION__</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span>
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<span><span class="label">__FILE__</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span>
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<span><span class="label">__LINE__</span>:<span class="type-var">'d</span> <span class="arrow">-></span></span>
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<span><span class="label">time_ns</span>:<span class="type-var">'e</span> <span class="arrow">-></span></span>
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<span><span class="label">tid</span>:<span class="type-var">'f</span> <span class="arrow">-></span></span>
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<span><span class="label">parent</span>:<span class="type-var">'g</span> <span class="arrow">-></span></span>
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<span><span class="label">data</span>:<span class="type-var">'h</span> <span class="arrow">-></span></span>
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<span><span class="label">name</span>:<span class="type-var">'i</span> <span class="arrow">-></span></span>
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<span><span class="label">flavor</span>:<span class="type-var">'j</span> <span class="arrow">-></span></span>
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<span><span class="label">trace_id</span>:<span class="type-var">'k</span> <span class="arrow">-></span></span>
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<span><span class="type-var">'l</span> <span class="arrow">-></span></span>
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unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_exit_manual_span"><a href="#val-on_exit_manual_span" class="anchor"></a><code><span><span class="keyword">val</span> on_exit_manual_span :
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<span><span class="type-var">'a</span> <span class="arrow">-></span></span>
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<span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span>
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<span><span class="label">tid</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span>
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<span><span class="label">name</span>:<span class="type-var">'d</span> <span class="arrow">-></span></span>
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<span><span class="label">data</span>:<span class="type-var">'e</span> <span class="arrow">-></span></span>
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<span><span class="label">flavor</span>:<span class="type-var">'f</span> <span class="arrow">-></span></span>
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<span><span class="label">trace_id</span>:<span class="type-var">'g</span> <span class="arrow">-></span></span>
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<span><span class="type-var">'h</span> <span class="arrow">-></span></span>
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unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-on_extension_event"><a href="#val-on_extension_event" class="anchor"></a><code><span><span class="keyword">val</span> on_extension_event : <span><span class="type-var">'a</span> <span class="arrow">-></span></span> <span><span class="label">time_ns</span>:<span class="type-var">'b</span> <span class="arrow">-></span></span> <span><span class="label">tid</span>:<span class="type-var">'c</span> <span class="arrow">-></span></span> <span><span class="type-var">'d</span> <span class="arrow">-></span></span> unit</span></code></div></div></div></body></html>
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