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<TITLE>Introduction to cosTransactions</TITLE>
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<H2>2 Introduction to cosTransactions</H2>
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<H3>2.1 Overview</H3>
<P>The cosTransactions application is a Transaction Service compliant with the <A TARGET="_top" HREF="http://www.omg.org">OMG</A>
Transaction Service CosTransactions 1.1.
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<H4>2.1.1 Purpose and Dependencies</H4>
<P> <STRONG>cosTransactions</STRONG> is dependent on <STRONG>Orber version 3.0.1</STRONG> or later(see the Orber
documentation), which provides CORBA functionality in an Erlang environment.
<P> <STRONG>cosTransactions</STRONG> is dependent on <STRONG>supervisor/stdlib-1.7</STRONG> or later.
<P> Basically, cosTransaction implements a <STRONG>two-phase commit protocol</STRONG> and allows objects running
on different platforms to participate in a transaction.
<A NAME="2.1.2"><!-- Empty --></A>
<H4>2.1.2 Prerequisites</H4>
<P> To fully understand the concepts presented in the
documentation, it is recommended that the user is familiar
with distributed programming, CORBA and the Orber application.
<P> Recommended reading includes <STRONG>CORBA,
Fundamentals and Programming - Jon Siegel</STRONG> and <STRONG> Open Telecom Platform Documentation
Set</STRONG>. It is also helpful to have read
<STRONG> Concurrent Programming in Erlang</STRONG> and, for example, <STRONG> Transaction Processing: concepts and techniques - Jim Gray, Andreas Reuter</STRONG>.
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The cosTransaction application is compliant with the OMG CosTransactions specification 1.1. Using
other vendors transaction service, compliant with the OMG CosTransactions specification 1.0, may
not work since the <CODE>'TRANSACTION_REQUIRED', 'TRANSACTION_ROLLEDBACK'</CODE> and <CODE>'INVALID_TRANSACTION'</CODE>
exceptions have been redefined to be system exceptions, i.e., used to be transaction-specific ('CosTransactions_Exc').
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