php-doc-en/reference/eio/examples.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- $Revision$ -->

<chapter xml:id="eio.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.examples;
 <para>
 <example>
 <title>Cancelling a request</title>
 <programlisting role="php">
 <![CDATA[
 <?php
 /* Is called when eio_nop() finished */
 function my_nop_cb($data, $result) {
  echo "my_nop ", $data, "\n";
 }

// This eio_nop() call will be cancelled
$req = eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "1");
var_dump($req);
eio_cancel($req);

// This time eio_nop() will be processed
eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "2");

// Process requests
eio_event_loop();
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
 <![CDATA[
resource(4) of type (EIO Request Descriptor)
my_nop 2
 ]]>
 </screen>
 </example>
 </para>

 <para>
 <example>
 <title>Calling <function>eio_chmod</function></title>
 <programlisting role="php">
 <![CDATA[
<?php
$temp_filename = dirname(__FILE__) ."/eio-temp-file.tmp";
touch($temp_filename);

/* Is called when eio_chmod() finished */
function my_chmod_callback($data, $result) {
    global $temp_filename;

    if ($result == 0 && !is_readable($temp_filename) && is_writable($temp_filename)) {
        echo "eio_chmod_ok";
    }

    @unlink($temp_filename);
}

eio_chmod($temp_filename, 0200, EIO_PRI_DEFAULT, "my_chmod_callback");
eio_event_loop();
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
 <![CDATA[
eio_chmod_ok
 ]]>
 </screen>
 </example>
 </para>

 <para>
 <example>
 <title>Making a custom request</title>
 <programlisting role="php">
 <![CDATA[
<?php
/* Callback for the custom callback */
function my_custom_callback($data, $result) {
    var_dump($data);
    var_dump(count($result));
    var_dump($result['data_modified']);
    var_dump($result['result']);
}

/* The custom request */
function my_custom($data) {
    var_dump($data);

    $result  = array(
        'result'        => 1001,
        'data_modified' => "my custom data",
    );

    return $result;
}

$data = "my_custom_data";
$req = eio_custom("my_custom", EIO_PRI_DEFAULT, "my_custom_callback", $data);
var_dump($req);
eio_event_loop();
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
 <![CDATA[
resource(4) of type (EIO Request Descriptor)
string(14) "my_custom_data"
string(14) "my_custom_data"
int(2)
string(14) "my custom data"
int(1001)
 ]]>
 </screen>
 </example>
 </para>

 <para>
 <example>
 <title>Grouping requests</title>
 <programlisting role="php">
 <![CDATA[
<?php
/*
 * Create a group request to open, read and close a file
 */

$temp_filename = dirname(__FILE__) ."/eio-file.tmp";
$fp = fopen($temp_filename, "w");
fwrite($fp, "some data");
fclose($fp);

/* Is called when the group requests are done */
function my_grp_done($data, $result) {
 global $temp_filename;
 var_dump($result == 0);
 @unlink($temp_filename);
}

/* Is called when eio_open() done */
function my_grp_file_opened_callback($data, $result) {
 global $my_file_fd, $grp;

 $my_file_fd = $result;

 var_dump($result > 0);

 // Create eio_read() request and add it to the group
 $req = eio_read($my_file_fd, 4, 0, EIO_PRI_DEFAULT, "my_grp_file_read_callback");
 eio_grp_add($grp, $req);
}

/* Is called when eio_read() done */
function my_grp_file_read_callback($data, $result) {
 global $my_file_fd, $grp;

 var_dump($result);

 // Create eio_close() request and add it to the group
 $req = eio_close($my_file_fd);
 eio_grp_add($grp, $req);
}

$grp = eio_grp("my_grp_done", "my_grp_data");

// Create eio_open() request and add it to the group
$req = eio_open($temp_filename, EIO_O_RDWR | EIO_O_APPEND , NULL,
  EIO_PRI_DEFAULT, "my_grp_file_opened_callback", NULL);
eio_grp_add($grp, $req);
var_dump($grp);

eio_event_loop();
?>
]]>
</programlisting>
&example.outputs.similar;
<screen>
 <![CDATA[
resource(6) of type (EIO Group Descriptor)
bool(true)
string(4) "some"
bool(true)
 ]]>
 </screen>
 </example>
 </para>

<para>
  <example>
   <title>Using eio with libevent extension</title>
   <programlisting role="php"><![CDATA[
<?php
function my_eio_poll($fd, $events, $arg) {
    /* Some libevent regulation might go here .. */
    if (eio_nreqs()) {
        eio_poll();
    }
    /* .. and here */
}

function my_nop_cb($d, $r) {
    var_dump($r); var_dump($d);
}

$base = event_base_new();
$event = event_new();

$fd = eio_get_event_stream();
var_dump($fd);

eio_nop(EIO_PRI_DEFAULT, "my_nop_cb", "nop data");
eio_mkdir("/tmp/abc-eio-temp", 0750, EIO_PRI_DEFAULT, "my_nop_cb", "nop data");
/* some other eio_* calls here ... */


// set event flags
event_set($event, $fd, EV_READ /*| EV_PERSIST*/, "my_eio_poll", array($event, $base));

// set event base 
event_base_set($event, $base);

// enable event
event_add($event);

// start event loop
event_base_loop($base);

/* The same will be available via buffered libevent interface */
?>
]]></programlisting>

&example.outputs.similar;
<screen>
 <![CDATA[
int(3)
int(0)
string(8) "nop data"
int(0)
string(10) "mkdir data"
 ]]>
 </screen>
</example>
</para>

<para>
  <example>
   <title>Using eio with event extension</title>
   <programlisting role="php"><![CDATA[
<?php
$base = new EventBase();

// Retrieve eio polling stream.
// Note, this variable should be alive as long as the event loop is running.
$eio_stream = eio_get_event_stream();

// Bind eio polling stream to the event loop.
$poll_event = new Event($base, $eio_stream, Event::READ, function () {
  if (eio_nreqs()) {
    eio_poll();
  }
});
$poll_event->add();

// Add eio jobs
eio_nop(EIO_PRI_DEFAULT, function () {
  echo "eio_nop\n";
});

// Add events
$timer = Event::timer($base, function () {
  echo "2 seconds elapsed\n";
});
$timer->add(2);

// Dispatch events.
$base->dispatch();
?>
]]></programlisting>

&example.outputs.similar;
<screen>
 <![CDATA[
eio_nop
2 seconds elapsed
 ]]>
 </screen>
</example>
</para>

</chapter>

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