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<link title="Get" rel="Chapter" href="Get.html"><title>Ocamlnet 4 Reference Manual : Rpc_proxy.ReliabilityCache</title>
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<h1>Module <a href="type_Rpc_proxy.ReliabilityCache.html">Rpc_proxy.ReliabilityCache</a></h1>
<pre><span id="MODULEReliabilityCache"><span class="keyword">module</span> ReliabilityCache</span>: <code class="code">sig</code> <a href="Rpc_proxy.ReliabilityCache.html">..</a> <code class="code">end</code></pre><hr width="100%">
<p>The reliability cache stores information about the availability
of remote servers. The managed clients put information about
recent failures into the cache.</p>
<p>It is advantegeous to have only one cache per process, because
this maximizes the usefulness. The cache is thread-safe.</p>
<p>A server endpoint is disabled when too many errors occur in
sequence. For a disabled endpoint the functions <code class="code">host_is_enabled</code>
and/or <code class="code">sockaddr_is_enabled</code> return <code class="code">false</code>. The endpoint is
automatically enabled again after some timeout; this is initially
<code class="code">disable_timeout_min</code>, but is increased exponentially until
<code class="code">disable_timeout_max</code> when further errors occur.</p>
<p>Independently of this machinery the functions <code class="code">host_is_enabled</code>
and <code class="code">sockaddr_is_enabled</code> may also return <code class="code">false</code> when an
external availability checker says that the endpoint is down.
This information is not entered into the cache, and will also
not trigger the disable timeout. Instead, the hook function
getting the availability will be simply called again.</p>
<pre><span id="TYPErcache"><span class="keyword">type</span> <code class="type"></code>rcache</span> </pre>
<div class="info ">
<div class="info-desc">
<p>The cache</p>
</div>
</div>
<pre><span id="TYPErcache_policy"><span class="keyword">type</span> <code class="type"></code>rcache_policy</span> = <code class="type">[ `Any_failing_port_disables_host<br> | `Failing_port_disables_host of int<br> | `Independent<br> | `None ]</code> </pre>
<div class="info ">
<div class="info-desc">
<p>How failures of individual ports are interpreted:</p>
<ul>
<li><code class="code">`Independent</code>: When a connection to a remote port repeatedly fails,
only this port is disabled</li>
<li><code class="code">`Failing_port_disables_host p</code>: When a connection to the TCP
port <code class="code">p</code> repeatedly fails, the whole remote host is disabled.
Other ports do not disable the host, but are treated as in
<code class="code">`Independent</code>.</li>
<li><code class="code">`Any_failing_port_disables_host</code>: When a connection to any TCP
port repeatedly fails, the whole remote host is disabled</li>
<li><code class="code">`None</code>: Nothing is disabled</li>
</ul>
<p>Note that the <code class="code">rcache_availability</code> hook is not affected by the
policy; this hook is called anyway. The policy only determines
how the internal error counter is interpreted.</p>
</div>
</div>
<pre><code><span id="TYPErcache_config"><span class="keyword">type</span> <code class="type"></code>rcache_config</span> = {</code></pre><table class="typetable">
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTrcache_config.rcache_policy">rcache_policy</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_policy">rcache_policy</a></code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>The policy, see above</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTrcache_config.rcache_disable_timeout_min">rcache_disable_timeout_min</span> : <code class="type">float</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>For how long ports and hosts
are disabled</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTrcache_config.rcache_disable_timeout_max">rcache_disable_timeout_max</span> : <code class="type">float</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>For how long ports and hosts
are disabled at most</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTrcache_config.rcache_threshold">rcache_threshold</span> : <code class="type">int</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>How many errors are required
for disabling a port</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr>
<tr>
<td align="left" valign="top" >
<code> </code></td>
<td align="left" valign="top" >
<code><span id="TYPEELTrcache_config.rcache_availability">rcache_availability</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -> Unix.sockaddr -> bool</code>;</code></td>
<td class="typefieldcomment" align="left" valign="top" ><code>(*</code></td><td class="typefieldcomment" align="left" valign="top" ><div class="info ">
<div class="info-desc">
<p>External
availability checker. Called by <code class="code">sockaddr_is_enabled</code> before
the result is calculated</p>
</div>
</div>
</td><td class="typefieldcomment" align="left" valign="bottom" ><code>*)</code></td>
</tr></table>
}
<pre><span id="VALcreate_rcache_config"><span class="keyword">val</span> create_rcache_config</span> : <code class="type">?policy:<a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_policy">rcache_policy</a> -><br> ?disable_timeout_min:float -><br> ?disable_timeout_max:float -><br> ?threshold:int -><br> ?availability:(<a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -> Unix.sockaddr -> bool) -><br> unit -> <a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_config">rcache_config</a></code></pre><div class="info ">
<div class="info-desc">
<p>Create a config record. The optional arguments set the config
components with the same name. The arguments default to:</p>
<ul>
<li><code class="code">policy = `None</code></li>
<li><code class="code">disable_timeout_min = 1.0</code></li>
<li><code class="code">disable_timeout_max = 64.0</code></li>
<li><code class="code">threshold = 1</code></li>
<li><code class="code">availability = fun _ _ -> true</code></li>
</ul>
</div>
</div>
<pre><span id="VALcreate_rcache"><span class="keyword">val</span> create_rcache</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_config">rcache_config</a> -> <a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a></code></pre><div class="info ">
<div class="info-desc">
<p>Creates a new cache object. The same cache can be used by several
managed clients, even by totally unrelated ones</p>
</div>
</div>
<pre><span id="VALrcache_config"><span class="keyword">val</span> rcache_config</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -> <a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_config">rcache_config</a></code></pre><div class="info ">
<div class="info-desc">
<p>Return the config</p>
</div>
</div>
<pre><span id="VALglobal_rcache_config"><span class="keyword">val</span> global_rcache_config</span> : <code class="type">unit -> <a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_config">rcache_config</a></code></pre><div class="info ">
<div class="info-desc">
<p>Returns the global config:</p>
<ul>
<li><code class="code">policy = `None</code></li>
<li><code class="code">disable_timeout_min = 1.0</code></li>
<li><code class="code">disable_timeout_max = 64.0</code></li>
<li><code class="code">threshold = 1</code></li>
<li><code class="code">availability = fun _ _ -> true</code></li>
</ul>
</div>
</div>
<pre><span id="VALset_global_rcache_config"><span class="keyword">val</span> set_global_rcache_config</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_config">rcache_config</a> -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Sets the new global config. This is only possible as long as
neither <code class="code">default_global_config</code> nor <code class="code">global_rcache</code> have been called.</p>
</div>
</div>
<pre><span id="VALglobal_rcache"><span class="keyword">val</span> global_rcache</span> : <code class="type">unit -> <a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a></code></pre><div class="info ">
<div class="info-desc">
<p>The global cache. Initially, this cache has the default config.
It is possible to change the default config before using the
global cache for the first time.</p>
</div>
</div>
<pre><span id="VALderive_rcache"><span class="keyword">val</span> derive_rcache</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -><br> <a href="Rpc_proxy.ReliabilityCache.html#TYPErcache_config">rcache_config</a> -> <a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a></code></pre><div class="info ">
<div class="info-desc">
<p><code class="code">derive_cache parent config</code>: Returns a new cache that shares the
error counters with <code class="code">parent</code>. The interpretation of the counters,
however, may be differently configured in <code class="code">config</code>.</p>
<p>Because it is advantageous to share the error information as much
as possible, the recommended way to create a new cache object is
to derive it from the global cache.</p>
<p>What <code class="code">derive_rcache</code> actually does (and this is not yet
optimal): Any <code class="code">incr</code> and <code class="code">reset</code> of an error counter is also
forwarded to the parent cache. The tests whether hosts and ports
are enabled do an AND of the results for the cache and its parent
(i.e. both must be ok to enable). This allows some information
sharing, but only in vertical direction.</p>
</div>
</div>
<pre><span id="VALincr_rcache_error_counter"><span class="keyword">val</span> incr_rcache_error_counter</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -> Unix.sockaddr -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Increase the error counter for this sockaddr. If the threshold
is reached and there is a disable policy, the sockaddr will be disabled.</p>
<p>This function is to be called after an RPC call times out, or
runs into a socket error.</p>
</div>
</div>
<pre><span id="VALreset_rcache_error_counter"><span class="keyword">val</span> reset_rcache_error_counter</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -> Unix.sockaddr -> unit</code></pre><div class="info ">
<div class="info-desc">
<p>Reset the error counter for this sockaddr. If disabled, the
sockaddr is set to enabled again.</p>
<p>This function is to be called when an RPC call is successful.</p>
</div>
</div>
<pre><span id="VALsockaddr_is_enabled"><span class="keyword">val</span> sockaddr_is_enabled</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -> Unix.sockaddr -> bool</code></pre><div class="info ">
<div class="info-desc">
<p>Returns whether the sockaddr is enabled. This also calls the
<code class="code">rcache_availability</code> hook.</p>
</div>
</div>
<pre><span id="VALhost_is_enabled"><span class="keyword">val</span> host_is_enabled</span> : <code class="type"><a href="Rpc_proxy.ReliabilityCache.html#TYPErcache">rcache</a> -> Unix.inet_addr -> bool</code></pre><div class="info ">
<div class="info-desc">
<p>Returns whether the host is enabled</p>
</div>
</div>
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