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Chapter 9. Sending Binary Data with SOAP MTOM
Abstract
SOAP Message Transmission Optimization Mechanism (MTOM) replaces SOAP with attachments as a mechanism for sending binary data as part of an XML message. Using MTOM with Apache CXF requires adding the correct schema types to a service’s contract and enabling the MTOM optimizations.
9.1. Overview of MTOM
SOAP Message Transmission Optimization Mechanism (MTOM) specifies an optimized method for sending binary data as part of a SOAP message. Unlike SOAP with Attachments, MTOM requires the use of XML-binary Optimized Packaging (XOP) packages for transmitting binary data. Using MTOM to send binary data does not require you to fully define the MIME Multipart/Related message as part of the SOAP binding. It does, however, require that you do the following:
Annotate the data that you are going to send as an attachment.
You can annotate either your WSDL or the Java class that implements your data.
Enable the runtime’s MTOM support.
This can be done either programmatically or through configuration.
Develop a
DataHandlerfor the data being passed as an attachment.NoteDeveloping
DataHandlers is beyond the scope of this book.
9.2. Annotating Data Types to use MTOM
Overview
In WSDL, when defining a data type for passing along a block of binary data, such as an image file or a sound file, you define the element for the data to be of type xsd:base64Binary. By default, any element of type xsd:base64Binary results in the generation of a byte[] which can be serialized using MTOM. However, the default behavior of the code generators does not take full advantage of the serialization.
In order to fully take advantage of MTOM you must add annotations to either your service’s WSDL document or the JAXB class that implements the binary data structure. Adding the annotations to the WSDL document forces the code generators to generate streaming data handlers for the binary data. Annotating the JAXB class involves specifying the proper content types and might also involve changing the type specification of the field containing the binary data.
WSDL first
Example 9.1, “Message for MTOM” shows a WSDL document for a Web service that uses a message which contains one string field, one integer field, and a binary field. The binary field is intended to carry a large image file, so it is not appropriate to send it as part of a normal SOAP message.
Example 9.1. Message for MTOM
<?xml version="1.0" encoding="UTF-8"?>
<definitions name="XrayStorage"
targetNamespace="http://mediStor.org/x-rays"
xmlns="http://schemas.xmlsoap.org/wsdl/"
xmlns:tns="http://mediStor.org/x-rays"
xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/"
xmlns:xsd1="http://mediStor.org/types/"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<types>
<schema targetNamespace="http://mediStor.org/types/"
xmlns="http://www.w3.org/2001/XMLSchema">
<complexType name="xRayType">
<sequence>
<element name="patientName" type="xsd:string" />
<element name="patientNumber" type="xsd:int" />
<element name="imageData" type="xsd:base64Binary" />
</sequence>
</complexType>
<element name="xRay" type="xsd1:xRayType" />
</schema>
</types>
<message name="storRequest">
<part name="record" element="xsd1:xRay"/>
</message>
<message name="storResponse">
<part name="success" type="xsd:boolean"/>
</message>
<portType name="xRayStorage">
<operation name="store">
<input message="tns:storRequest" name="storRequest"/>
<output message="tns:storResponse" name="storResponse"/>
</operation>
</portType>
<binding name="xRayStorageSOAPBinding" type="tns:xRayStorage">
<soap12:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/>
<operation name="store">
<soap12:operation soapAction="" style="document"/>
<input name="storRequest">
<soap12:body use="literal"/>
</input>
<output name="storResponse">
<soap12:body use="literal"/>
</output>
</operation>
</binding>
...
</definitions>
If you want to use MTOM to send the binary part of the message as an optimized attachment you must add the xmime:expectedContentTypes attribute to the element containing the binary data. This attribute is defined in the http://www.w3.org/2005/05/xmlmime namespace and specifies the MIME types that the element is expected to contain. You can specify a comma separated list of MIME types. The setting of this attribute changes how the code generators create the JAXB class for the data. For most MIME types, the code generator creates a DataHandler. Some MIME types, such as those for images, have defined mappings.
The MIME types are maintained by the Internet Assigned Numbers Authority(IANA) and are described in detail in Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies and Multipurpose Internet Mail Extensions (MIME) Part Two: Media Types.
For most uses you specify application/octet-stream.
Example 9.2, “Binary Data for MTOM” shows how you can modify xRayType from Example 9.1, “Message for MTOM” for using MTOM.
Example 9.2. Binary Data for MTOM
...
<types>
<schema targetNamespace="http://mediStor.org/types/"
xmlns="http://www.w3.org/2001/XMLSchema"
xmlns:xmime="http://www.w3.org/2005/05/xmlmime">
<complexType name="xRayType">
<sequence>
<element name="patientName" type="xsd:string" />
<element name="patientNumber" type="xsd:int" />
<element name="imageData" type="xsd:base64Binary"
xmime:expectedContentTypes="application/octet-stream"/>
</sequence>
</complexType>
<element name="xRay" type="xsd1:xRayType" />
</schema>
</types>
...
The generated JAXB class generated for xRayType no longer contains a byte[]. Instead the code generator sees the xmime:expectedContentTypes attribute and generates a DataHandler for the imageData field.
You do not need to change the binding element to use MTOM. The runtime makes the appropriate changes when the data is sent.
Java first
If you are doing Java first development you can make your JAXB class MTOM ready by doing the following:
- Make sure the field holding the binary data is a DataHandler.
-
Add the
@XmlMimeType()annotation to the field containing the data you want to stream as an MTOM attachment.
Example 9.3, “JAXB Class for MTOM” shows a JAXB class annotated for using MTOM.
Example 9.3. JAXB Class for MTOM
@XmlType
public class XRayType {
protected String patientName;
protected int patientNumber;
@XmlMimeType("application/octet-stream")
protected DataHandler imageData;
...
}9.3. Enabling MTOM
By default the Apache CXF runtime does not enable MTOM support. It sends all binary data as either part of the normal SOAP message or as an unoptimized attachment. You can activate MTOM support either programmatically or through the use of configuration.
9.3.1. Using JAX-WS APIs
Overview
Both service providers and consumers must have the MTOM optimizations enabled. The JAX-WS APIs offer different mechanisms for each type of endpoint.
Service provider
If you published your service provider using the JAX-WS APIs you enable the runtime’s MTOM support as follows:
Access the
Endpointobject for your published service.The easiest way to access the
Endpointobject is when you publish the endpoint. For more information see Chapter 31, Publishing a Service.Get the SOAP binding from the
Endpointusing itsgetBinding()method, as shown in Example 9.4, “Getting the SOAP Binding from an Endpoint”.Example 9.4. Getting the SOAP Binding from an Endpoint
// Endpoint ep is declared previously SOAPBinding binding = (SOAPBinding)ep.getBinding();
You must cast the returned binding object to a
SOAPBindingobject to access the MTOM property.Set the binding’s MTOM enabled property to
trueusing the binding’ssetMTOMEnabled()method, as shown in Example 9.5, “Setting a Service Provider’s MTOM Enabled Property”.Example 9.5. Setting a Service Provider’s MTOM Enabled Property
binding.setMTOMEnabled(true);
Consumer
To MTOM enable a JAX-WS consumer you must do the following:
Cast the consumer’s proxy to a
BindingProviderobject.For information on getting a consumer proxy see Chapter 25, Developing a Consumer Without a WSDL Contract or Chapter 28, Developing a Consumer From a WSDL Contract.
Get the SOAP binding from the
BindingProviderusing itsgetBinding()method, as shown in Example 9.6, “Getting a SOAP Binding from aBindingProvider”.Example 9.6. Getting a SOAP Binding from a
BindingProvider// BindingProvider bp declared previously SOAPBinding binding = (SOAPBinding)bp.getBinding();
Set the bindings MTOM enabled property to
trueusing the binding’ssetMTOMEnabled()method, as shown in Example 9.7, “Setting a Consumer’s MTOM Enabled Property”.Example 9.7. Setting a Consumer’s MTOM Enabled Property
binding.setMTOMEnabled(true);
9.3.2. Using configuration
Overview
If you publish your service using XML, such as when deploying to a container, you can enable your endpoint’s MTOM support in the endpoint’s configuration file. For more information on configuring endpoint’s see Part IV, “Configuring Web Service Endpoints”.
Procedure
The MTOM property is set inside the jaxws:endpoint element for your endpoint. To enable MTOM do the following:
-
Add a
jaxws:propertychild element to the endpoint’sjaxws:endpointelement. -
Add a
entrychild element to thejaxws:propertyelement. -
Set the
entryelement’skeyattribute tomtom-enabled. -
Set the
entryelement’svalueattribute totrue.
Example
Example 9.8, “Configuration for Enabling MTOM” shows an endpoint that is MTOM enabled.
Example 9.8. Configuration for Enabling MTOM
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jaxws="http://cxf.apache.org/jaxws"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.0.xsd
http://cxf.apache.org/jaxws http://cxf.apache.org/schema/jaxws.xsd">
<jaxws:endpoint id="xRayStorage"
implementor="demo.spring.xRayStorImpl"
address="http://localhost/xRayStorage">
<jaxws:properties>
<entry key="mtom-enabled" value="true"/>
</jaxws:properties>
</jaxws:endpoint>
</beans>