Axis2/C is a C based implementation of the Apache Soap engine, and builds on lessons learned from the Java version, Axis2/Java. It is written in C for platform portability, and has a pseudo object-oriented design approach¹. This involves putting operations in the header files and the data in the source files. Also macros are used extensively to hide complexity.

Rogue Wave’s HydraExpress product, on the other hand, is written in native C++, and the code it generates from a WSDL file is also C++. This means that the C++ standard library with its implementations of strings and collection classes are available to the user. HydraExpress is also supported across a wide range of platforms including Windows, Linux and UNIX.

For C++ developers who wish to easily create and deploy Web services, the pseudo object-oriented design approach and C language implementation of Axis2/C can present challenges when starting development. The HydraExpress C++ approach may present a coding style that is more familiar.

The example below is a comparison of the code required to implement a simple “Hello World” service in both Axis2/C and HydraExpress.

Axis2/C

adb_helloResponse_t* axis2_skel_GreetingService_hello(const axutil_env_t *env,
                                                      adb_hello_t* hello)
{
    /* TODO fill this with the necessary business logic */
    adb_helloResponse_t *response;
    axis2_char_t *input_message;
    axis2_char_t *output_message;

    /* Extract the request */
    input_message = adb_hello_get_hellorequest(hello, env);

    /* Create a response message */
    output_message = ‘Hello from server’;

    /* Build the response adb */
    response = adb_helloResponse_create(env);
    if (response)
    {
        adb_helloResponse_set_return(response, env, output_message);
    }
    return response;
}

Hydra Express

std::string
GreetingPortTypeImp::hello(rwsf::CallInfo& callInfo,
                           const std::string& hellorequest_in)
{
    return std::string(’Hello from server ‘ + hellorequest_in);
}

References
1. http://wso2.org/library/252

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This entry was posted on Wednesday, September 10th, 2008 at 9:49 pm and is filed under C++ Web Services, Hydra Suite, HydraExpress. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.