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Jaa ad C++ SceCicai

By Eric Bruno, February 17, 2010

Po a Commen

Iegaig C++ aie Wid aicai ih Jaaaicai ia e ce

Performing all of your application development with asingle language on a single platform may be ideal, but it's

not always practical. There are times when you may need

to integrate a new application with a legacy one, andcommunication between the two can be an issue. For

instance, you may desire to isolate the two applications

so that the new application's design isn't compromised,

and the older one can be upgraded later without impactingthe newer application.

Peia Si

In the past, I've explored distributed computing solutionsthat have discussed integrating Java and C++ applications

via the Java Native Interface (JNI), Java Message System

(JMS), and web services; see the the "Conclusion" sectionat the end of this article. Although these approaches are

good in the right situations, there may be times where

these solutions are too complicated or just not ideal. Forinstance, calling into native code from Java via JNI can be

complex, time-consuming, and error-prone. Using JMS

requires a JMS provider be licensed, installed, andconfigured. And a web service requires significant

development and web-based infrastructure.

Another solution is to use socket-based network

communication directly between the Java and C++

applications. Although this is a relatively low-levelapproach, it's still an effective solution. With XML as the

message protocol between them, you can maintain a

degree of platform and language independence. Figure 1illustrates this in a very simple way; here we show that a

C++ application that uses Windows sockets can

communicate with a Java application that uses Java IO(scenario c) just as easily as in the two homogenous

examples (scenarios a and b), and with no code changes.

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Fige 1: A Jaa aicai ca cicae diecih a C++ ic aicai.

The Sce Si

Let's explore a sample integration solution that includes a

Java application that uses java.io to communicate with a

C++ Windows application that uses Windows sockets. TheWindows application supports three simple requests forthe following data:

The Windows host name

The amount of memory installed

A pseudorandom number

These requests are simple for illustration only, but inreality they may be requests for data only available from a

legacy application or a native platform interface. All

requests and responses are formatted as simple XMLcharacter strings. Specifically, both the client and server

wait for data and read bytes from the network stream,

with each full message delineated by a NULL or '\n' character.

The simple XML request messages are in Example 1. Each

message has the same basic XML structure, with only the

request name differing between them.

Eae 1: The XML ee eage e f hecie, he ee.

If you need to send data along with each request, simplyadd one or more XML elements to the request message.

For example, if you want to change the GetMemor

message to indicate the type of memory (physical or

virtual) to request, the XML can be changed to look like

the following:

The response messages are similar to the requests with

some obvious changes; see Example 2. The main

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differences are the XML response types, and the inclusion

of the data being requested.

Eae 2: The XML ee eage e f

he ee, i ee cie ee.

In this sample implementation, the actual data returned in

each response will vary according to the computer it's runon. Let's begin to dive into the implementation of the

solution, beginning with the Java client application.

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