# Beispiele

Beispiel #1 Cancelling a request

    <?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();
    ?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    resource(4) of type (EIO Request Descriptor)
    my_nop 2

Beispiel #2 Calling eio_chmod()

    <?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();
    ?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    eio_chmod_ok

Beispiel #3 Making a custom request

    <?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();
    ?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    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)

Beispiel #4 Grouping requests

    <?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();
    ?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    resource(6) of type (EIO Group Descriptor)
    bool(true)
    string(4) "some"
    bool(true)

Beispiel #5 Using eio with libevent extension

    <?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 */
    ?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    int(3)
    int(0)
    string(8) "nop data"
    int(0)
    string(10) "mkdir data"

Beispiel #6 Using eio with event extension

    <?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();
    ?>

Das oben gezeigte Beispiel erzeugt eine ähnliche Ausgabe wie:

    eio_nop
    2 seconds elapsed

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