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<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->
<refentry xml:id="zmqdevice.construct" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>ZMQDevice::__construct</refname>
<refpurpose>Construct a new device</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<modifier>public</modifier> <methodname>ZMQDevice::__construct</methodname>
<methodparam><type>ZMQSocket</type><parameter>frontend</parameter></methodparam>
<methodparam><type>ZMQSocket</type><parameter>backend</parameter></methodparam>
<methodparam choice="opt"><type>ZMQSocket</type><parameter>listener</parameter></methodparam>
</methodsynopsis>
<para>
"ØMQ devices can do intermediation of addresses, services, queues, or any other abstraction you care to define above the message and socket layers." -- zguide
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<variablelist>
<varlistentry>
<term><parameter>frontend</parameter></term>
<listitem>
<para>
Frontend parameter for the devices. Usually where there messages
are coming.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>backend</parameter></term>
<listitem>
<para>
Backend parameter for the devices. Usually where there messages
going to.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>listener</parameter></term>
<listitem>
<para>
Listener socket, which receives a copy of all messages going both directions.
The type of this socket should be SUB, PULL or DEALER.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
Call to this method will prepare the device. Usually devices are very long
running processes so running this method from interactive script is not recommended. This
method throw ZMQDeviceException if the device cannot be started.
</para>
</refsect1>
</refentry>
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