Implementing MTOM in Oracle Application Server (Oracle AS). Creating the server side.

The first to do is to launch Oracle JDeveloper IDE, create a new Empty project from File| New on the main menu and name it MTOM_Server. Then go to the Applications Navigator windows, right-click on the project MTOM_Server and select the New option from the context menu. In the New Gallery windows, select Java Class from Items as shown in Figure 1. Then you must enter a name for the class such as BinaryFileTransferService.

Figure 1: Creation of a Java class.

Now we're going to define the behavior of the service for returning a byte array representing a binary file as shown in Listing 1.

package mtom_server;

import java.io.FileInputStream;

import java.nio.ByteBuffer;

import java.nio.channels.ReadableByteChannel;

Public Class BinaryFileTransferService

{

    Public BinaryFileTransferService()

    {

    }

    public byte[] getFile(String strPath)

    {

        byte[] barrResult=null;

        try

        {

            //Obtain a channel.

            ReadableByteChannel objChannel = new FileInputStream(strPath).getChannel();         

            barrResult = new byte[6144];

            ByteBuffer objBuffer = ByteBuffer.allocateDirect(6144);

            int nTotalRead = 0;

            while(nTotalRead>=0)

            {

                objBuffer.rewind();

                nTotalRead = objChannel.read(objBuffer);

                objBuffer.rewind();

                for(int i=0;i<nTotalRead;i++)

                {

                    barrResult[i]=objBuffer.get();

                }

            }

        }

        catch(Exception ex)

        {

            barrResult=null;

        }

        return barrResult;

    }

}

Listing 1: The BinaryFileTransferService class definition.

In order to create the Web Service you must go to the Applications Navigator windows, right-click on the BinaryFileTransferService.java file as shown in Figure 2, select the Create J2EE Web Service option from the context menu and the Create Java Web Service wizard is launched.

Figure 2: Creation of the Web Service.

On the first page enter a name for the service such as BinaryFileTransferService and set the checkbox SOAP 1.2 Binding as shown in Figure 3. Then follow the ongoing pages with the default values.



Figure 3: Creation of the service BinaryFileTransferService.

In order to configure MTOM in the server, you need to set the mtom-support setting to true in the Web Service configuration file as shown in Listing 2 (highlighted in yellow).

<oracle-webservices xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://xmlns.oracle.com/oracleas/schema/oracle-webservices-10_0.xsd">

    <webservice-description name="BinaryFileTransferService">

        <port-component name="BinaryFileTransferServiceSoap12HttpPort">

        <mtom-support>true</mtom-support>

            <operations>

                <operation name="getFile" input="{http://mtom_server/types/}getFileElement"/>

            </operations>

        </port-component>

    </webservice-description>

</oracle-webservices>

Listing 2: Configuring the Web Service to support MTOM.

Now deploy the solution to Oracle AS, and we're ready to create the client in WCF.

Implementing the client in Windows Communication Foundation:

The first step is to launch Visual Studio.NET IDE and create a console application for hosting the client components. Now we're going to create the Web Service proxy using the svcutil.exe tool from the command windows as shown in Listing 3.

svcutil http://localhost:8888/MTOM_Server-context-root/BinaryFileTransferServiceSoap12HttpPort?wsdl

Listing 3: Creating the Web Service proxy using the svcutil tool.