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<?xml version="1.0" encoding="latin1" ?>
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<!DOCTYPE chapter SYSTEM "chapter.dtd">
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<holder>Ericsson AB, All Rights Reserved</holder>
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The contents of this file are subject to the Erlang Public License,
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Version 1.1, (the "License"); you may not use this file except in
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compliance with the License. You should have received a copy of the
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Erlang Public License along with this software. If not, it can be
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retrieved online at http://www.erlang.org/.
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Software distributed under the License is distributed on an "AS IS"
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basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
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the License for the specific language governing rights and limitations
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The Initial Developer of the Original Code is Ericsson AB.
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<title>Introduction to cosTransactions</title>
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<prepared>Niclas Eklund</prepared>
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<date>1999-04-26</date>
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<title>Overview</title>
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<p>The cosTransactions application is a Transaction Service compliant with the <url href="http://www.omg.org">OMG</url>
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Transaction Service CosTransactions 1.1.
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<title>Purpose and Dependencies</title>
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<p><em>cosTransactions</em> is dependent on <em>Orber version 3.0.1</em> or later(see the Orber
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documentation), which provides CORBA functionality in an Erlang environment.</p>
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<p><em>cosTransactions</em> is dependent on <em>supervisor/stdlib-1.7</em> or later.</p>
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<p>Basically, cosTransaction implements a <em>two-phase commit protocol</em> and allows objects running
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on different platforms to participate in a transaction.</p>
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<title>Prerequisites</title>
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<p>To fully understand the concepts presented in the
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documentation, it is recommended that the user is familiar
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with distributed programming, CORBA and the Orber application.
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<p>Recommended reading includes <em>CORBA, Fundamentals and Programming - Jon Siegel</em> and <em>Open Telecom Platform Documentation Set</em>. It is also helpful to have read
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<em>Concurrent Programming in Erlang</em> and, for example, <em>Transaction Processing: concepts and techniques - Jim Gray, Andreas Reuter</em>.</p>
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<p>The cosTransaction application is compliant with the OMG CosTransactions specification 1.1. Using
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other vendors transaction service, compliant with the OMG CosTransactions specification 1.0, may
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not work since the <c>'TRANSACTION_REQUIRED', 'TRANSACTION_ROLLEDBACK'</c> and <c>'INVALID_TRANSACTION'</c>
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exceptions have been redefined to be system exceptions, i.e., used to be transaction-specific ('CosTransactions_Exc').</p>