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Contents

1 Introduction 1

1.1 Int roduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.1 Erlang and O TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.2 Erlang/O TP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

1.1.3 Scope and P urpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31. 1. 4 Ab ou t t he E rla ng/O TP D o cu ment at io n . . . . . . . . . . . . . . . . . . . . . . . 3

List of Tables 5

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Chapter 1

Introduction

1.1 Introduction

1.1.1 Erlang and OTP

Erlang is a general-purpose programming language with built-in support for concurrency, distribution

and fault tolerance.

O TP (O pen Telecom Plat form ) is aimed a t providing time-saving and fl exible developm ent for robu st,

adaptable telecom systems. It consists of an Erlang runtime system, a number of ready-to-use

comp onents ma inly w ritten in Erlang, and a set of d esign principles for Erlang programs. Since Erlang

and O TP are closely interconnected the t erm Erlang/O TP is normally used instead of O TP.

1.1.2 Erlang/OTP

Erlang Runtime System

The Erlang runtime system (ERTS) is made up of an emulato r running on top of t he host operating

system, a kernel providing low -level services such as distribution and I/O handling, a nd a standard

library containing a large number of re-usable modules.

The OTP design principles provides the user with a way to structure the system based on a concept

called application. An OTP application is a w ay t o package a system com ponent and is either a set of

library modules or a supervision tree. A supervision tree is a hierarchical tree of processes used to

program f ault-tolerant systems. The processes are easiest implemented using behavior m odules w hich

are formalizations of design patterns. The standard library includes behavior modules for supervisors,

servers, stat e ma chines and generic event h andlers. In chap ter 4 O TP D esign Principles the design

principles are explained in d etail.

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Chapter 1: Introduction

OTP Components

The OTP components can be divided into six categories:

Basic Applicat ions - Basic E rlang/O TP functiona lity.

CompilerA compiler for Erlang modules.

Kernel Funct ionalit y necessary t o run Erla ng/O TP it self.

SASL (System Architecture Support Libraries) A set of tools for code replacement and alarm

handling etc.

StdlibThe standard library.

O perations and Maintenance - OAM both of t he system d eveloped by the user and of

Erla ng/O TP it self.

EVA A multi-featured event and alarm handler.

O S M on A monitor w hich allows inspection of the underlying operating system.

S NM P SNMP support including a MIB compiler and tools for creating SNMP agents.

Interface and C omm unication - Interoperability and protocols support.

Asn1Support fo r ASN.1.

C ometA library that enables Erlang/OTP to call C O M ob jects on w indows

CryptoC ryptographical support

Erl InterfaceLow level interface to C.

G SA graphics system used to write platform independent user interfaces.

InetsA set of services such as a web server and a FTP client.

JinterfaceLow level interface to Java.

SSL Secure Socket La yer (SSL),interface to U NIX BSD sockets

D atabase Management.

Q L CQ uery language support for Mnesia D BMS.

M nesia A heavy duty real-time distributed database.

O D B C O D BC database interface.

C O RBA services and ID L com piler.

cosEvent O rber O MG Event Service.

cosN otificati onO rber O MG Notification Service.

cosTimeO rber O MG Timer and TimerEvent Services.

cosTransactionsO rber OM G Transaction Service.

IC ID L compiler

O rberA C O RBA object request broker.

Tools.

Appmon A utility used to view OTP applications.

D ebuggerFor debugging and testing of Erlang programs.

ParsetoolsA set of parsing and lexical analysis tools.

PmanA process mana ger used t o inspect th e state of a n Erlang/O TP system.

Runtime ToolsTools to include in a prod uction system.

ToolbarA too l bar simplifying access to t he Erlang/O TP to ols.

ToolsA set of programming tools including a coverage analyzer etc.

TV An ETS a nd Mnesia graphical t able visualizer.

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Chapter 1: Introduction

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List of Tables

1. 1 E xa mples o f t ypo gra ph ica l co nvent io ns. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

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