/ 
Kafka-1.04
River stage one • 2 direct dependents • 2 total dependents
/ Kafka::Exceptions

NAME

Kafka::Exceptions - Perl Kafka API exception definitions.

VERSION

This documentation refers to Kafka::Exceptions version 1.04 .

SYNOPSIS

use 5.010;
use strict;
use warnings;

use Scalar::Util qw(
    blessed
);
use Try::Tiny;

# A simple example of Kafka::Connection usage:
use Kafka::Connection;

# connect to local cluster with the defaults
my $connection;
try {
    $connection = Kafka::Connection->new( host => 'localhost' );
} catch {
    my $error = $_;
    if ( blessed( $error ) && $error->isa( 'Kafka::Exception' ) ) {
        if ( $error->isa( 'Kafka::Exception::Connection' ) ) {
            # Specific treatment for 'Kafka::Connection' class error
        } elsif ( $error->isa( 'Kafka::Exception::IO' ) ) {
            # Specific treatment for 'Kafka::IO' class error
        }
        warn ref( $error ), " error:\n", $error->message, "\n", $error->trace->as_string, "\n";
        exit;
    } else {
        die $error;
    }
};

# Closes the connection and cleans up
$connection->close;
undef $connection;

DESCRIPTION

The purpose of the Kafka::Exceptions module is:

  • Declare a Kafka API exceptions hierarchy.

  • Provide additional methods for working with exceptions.

It is designed to make exception handling structured, simpler and better by encouraging use of hierarchy of exceptions in application (vs single catch-all exception class).

The following additional attributes are available in Kafka::Exception and its subclasses:

code

An error code that references error in %Kafka::ERROR hash.

message

An error message that contains information about the encountered failure. This message may contain additional details which are not provided by %Kafka::ERROR hash.

Exception objects provide accessor methods for these attributes. Attributes are inherited by subclasses.

Various Kafka API modules throw exceptions objects of a Kafka::Exception subclass specific to that module:

Kafka::Exception::Connection

See Kafka::Connection methods.

Kafka::Exception::Consumer

See Kafka::Consumer methods.

Kafka::Exception::IO

See Kafka::IO methods.

Kafka::Exception::Int64

See Kafka::Int64 methods.

Kafka::Exception::Producer

See Kafka::Producer methods.

Kafka::Exception::Protocol

See Kafka::Protocol methods.

Authors suggest using of Try::Tiny's try and catch to handle exceptions while working with Kafka package.

You may also want to review documentation of Exception::Class, which is the default base class for all exception objects created by this module.

FUNCTIONS

The following functions are exported by Kafka::Exceptions module:

throw_args( $error_code, $description )

Converts arguments into Kafka::Exception constructor attributes "code" and "message".

throw_args() accepts the following arguments:

$error_code

The code of the last error. The code must match the error codes defined in the module Kafka.

$description

An additional error description that contains information about the encountered problem.

SEE ALSO

The basic operation of the Kafka package modules:

Kafka - constants and messages used by the Kafka package modules.

Kafka::Connection - interface to connect to a Kafka cluster.

Kafka::Producer - interface for producing client.

Kafka::Consumer - interface for consuming client.

Kafka::Message - interface to access Kafka message properties.

Kafka::Int64 - functions to work with 64 bit elements of the protocol on 32 bit systems.

Kafka::Protocol - functions to process messages in the Apache Kafka's Protocol.

Kafka::IO - low-level interface for communication with Kafka server.

Kafka::Exceptions - module designated to handle Kafka exceptions.

Kafka::Internals - internal constants and functions used by several package modules.

A wealth of detail about the Apache Kafka and the Kafka Protocol:

Main page at http://kafka.apache.org/

Kafka Protocol at https://cwiki.apache.org/confluence/display/KAFKA/A+Guide+To+The+Kafka+Protocol

SOURCE CODE

Kafka package is hosted on GitHub: https://github.com/TrackingSoft/Kafka

AUTHOR

Sergey Gladkov

Please use GitHub project link above to report problems or contact authors.

CONTRIBUTORS

Alexander Solovey

Jeremy Jordan

Sergiy Zuban

Vlad Marchenko

COPYRIGHT AND LICENSE

Copyright (C) 2012-2017 by TrackingSoft LLC.

This package is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic at http://dev.perl.org/licenses/artistic.html.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.