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<h1>Module <a href="type_Lwt_pool.html">Lwt_pool</a></h1>
<pre><span class="keyword">module</span> Lwt_pool: <code class="code"><span class="keyword">sig</span></code> <a href="Lwt_pool.html">..</a> <code class="code"><span class="keyword">end</span></code></pre><div class="info module top">
Creating pools (for example pools of connections to a database).<br>
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<hr width="100%">
<br>
Instead of creating a new connection each time you need one,
keep a pool of opened connections and reuse opened connections
that are free.<br>
<pre><span id="TYPEt"><span class="keyword">type</span> <code class="type">'a</code> t</span> </pre>
<div class="info ">
Type of pools<br>
</div>
<pre><span id="VALcreate"><span class="keyword">val</span> create</span> : <code class="type">int -><br> ?check:('a -> (bool -> unit) -> unit) -><br> ?validate:('a -> bool <a href="Lwt.html#TYPEt">Lwt.t</a>) -> (unit -> 'a <a href="Lwt.html#TYPEt">Lwt.t</a>) -> 'a <a href="Lwt_pool.html#TYPEt">t</a></code></pre><div class="info ">
<code class="code">create n ?check ?validate f</code> creates a new pool with at most
<code class="code">n</code> members. <code class="code">f</code> is the function to use to create a new pool
member.
<p>
An element of the pool is validated by the optional <code class="code">validate</code>
function before its <a href="Lwt_pool.html#VALuse"><code class="code"><span class="constructor">Lwt_pool</span>.use</code></a>. Invalid elements are re-created.
<p>
The optional function <code class="code">check</code> is called after a <code class="code">use</code> of an
element failed. It must call its argument excatly one with
<code class="code"><span class="keyword">true</span></code> if the pool member is still valid and <code class="code"><span class="keyword">false</span></code>
otherwise.<br>
</div>
<pre><span id="VALuse"><span class="keyword">val</span> use</span> : <code class="type">'a <a href="Lwt_pool.html#TYPEt">t</a> -> ('a -> 'b <a href="Lwt.html#TYPEt">Lwt.t</a>) -> 'b <a href="Lwt.html#TYPEt">Lwt.t</a></code></pre><div class="info ">
<code class="code">use p f</code> takes one free member of the pool <code class="code">p</code> and gives it to
the function <code class="code">f</code>.<br>
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