NAME

ZMQ::Serializer - Serialization Support

SYNOPSIS

    use ZMQ;
    use ZMQ::Serializer;
    use JSON ();

    ZMQ::register_read_type(json => \&JSON::decode_json);
    ZMQ::register_write_type(json => \&JSON::encode_json);

    my $sock = $ctx->socket( ... );

    $sock->sendmsg_as( json => $payload );
    my $payload = $sock->recvmsg_as( 'json' );

DESCRIPTION

You can add a simple serialization/deserialization mechanism to ZMQ by enabling this module.

To enable serialization, you must load ZMQ::Serializer:

    use ZMQ;
    use ZMQ::Serializer;

This will add ZMQ::Socket::sendmsg_as() and ZMQ::Socket::recvmsg_as methods.

You also need to tell it how/what to serialize/deserialize. To do this, use register_write_type() to register a name and an associated callback to serialize the data. For example, for JSON we do the following (this is already done for you in ZMQ.pm if you have JSON.pm installed):

    use JSON ();
    ZMQ::Serializer::register_write_type('json' => \&JSON::encode_json);
    ZMQ::Serializer::register_read_type('json' => \&JSON::decode_json);

Then you can use sendmsg_as() and recvmsg_as() to specify the serialization type as the first argument:

    my $ctxt = ZMQ::Context->new();
    my $sock = $ctxt->socket( ZMQ_REQ );

    $sock->sendmsg_as( json => $complex_perl_data_structure );

The otherside will receive a JSON encoded data. The receivind side can be written as:

    my $ctxt = ZMQ::Context->new();
    my $sock = $ctxt->socket( ZMQ_REP );

    my $complex_perl_data_structure = $sock->recvmsg_as( 'json' );

No serializers are loaded by default.

FUNCTIONS

register_read_type($name, \&callback)

Register a read callback for a given $name. This is used in recvmsg_as(). The callback receives the data received from the socket.

register_write_type($name, \&callback)

Register a write callback for a given $name. This is used in sendmsg_as() The callback receives the Perl structure given to sendmsg_as()

METHODS

$rv = sendmsg_as( $type, $payload, $flags )

Encodes $payload according to the serializer specified by $type, and enqueues a new message to be sent. $payload should be whatever the serializer understands.

$payload = $sock->recvmsg_as( $type, $flags );

Receives a new message from the queue, and decodes the payload in the received message using the deserializer specified by $type.