AXIS2 DATAHANDLER PDF

Web services users may need to transmit binary attachments of various sorts like images, drawings, xml docs, etc together with SOAP message. Such data are often in a particular binary format. Traditionally, two techniques have been used in dealing with opaque data in XML; "By value" Sending binary data by value is achieved by embedding opaque data of course after some form of encoding as element or attribute content of the XML component of data. The main advantage of this technique is that it gives applications the ability to process and describe data based and looking only on XML component of the data. XML supports opaque data as content through the use of either base64 or hexadecimal text encoding. Both these techniques bloat the size of the data.

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Web services users may need to transmit binary attachments of various sorts like images, drawings, xml docs, etc together with SOAP message. Such data are often in a particular binary format. Traditionally, two techniques have been used in dealing with opaque data in XML; "By value" Sending binary data by value is achieved by embedding opaque data of course after some form of encoding as element or attribute content of the XML component of data. The main advantage of this technique is that it gives applications the ability to process and describe data based and looking only on XML component of the data.

XML supports opaque data as content through the use of either base64 or hexadecimal text encoding. Both these techniques bloat the size of the data. For UTF-8 underlying text encoding, base64 encoding increases the size of the binary data by a factor of 1. Above factors will be doubled if UTF text encoding is used.

Also of concern is the overhead in processing costs both real and perceived for these formats, especially when decoding back into raw binary. This prevents the unnecessary bloating of data and wasting of processing power. The primary obstacle for using these unparsed entities is their heavy reliance on DTDs, which impedes modularity as well as use of XML namespaces. There were several specifications introduced in the Web services world to deal with this binary attachment problem using the "by reference" technique.

SOAP with Attachments is one such example. Since SOAP prohibits document type declarations DTD in messages, this leads to the problem of not representing data as part of the message infoset, creating two data models. This scenario is like sending attachments with an e-mail message. Even though those attachments are related to the message content they are not inside the message. This causes the technologies for processing and description of data based on XML component of the data, to malfunction.

One example is WS-Security. MTOM tries to leverage the advantages of above two techniques by trying to merge the two techniques.

MTOM is actually a "by reference" method. With the use of this exclusive element the attached binary content logically become inline by value with the SOAP document even though actually it is attached separately. This merges the two realms by making it possible to work only with one data model. Following is an extract from the XOP specification. At the conceptual level, this binary data can be thought of as being baseencoded in the XML Document.

As this conceptual form might be needed during some processing of the XML Document e. In the reverse direction, XOP is capable of optimizing only baseencoded Infoset data that is in the canonical lexical form. It has been given this ability by allowing OMText to hold raw binary content in the form of javax. OMText has been chosen for this purpose with two reasons. Other one is to preserve the infoset in both sender and receiver To store the binary content in the same kind of object regardless of whether it is optimized or not.

MTOM allows to selectively encode portions of the message, which allows us to send base64encoded data as well as externally attached raw binary data referenced by "XOP" element optimized content to be send in a SOAP message.

User can specify whether an OMText node which contains raw binary data or base64encoded binary data is qualified to be optimized or not at the construction time of that node or later. To take the optimum efficiency of MTOM a user is advised to send smaller binary attachments using base64encoding None optimized and larger attachments as optimized content.

DataHandler to handle the binary data. One can also create binary content nodes which will not be optimized at any case.

They will be serialized and send as Base64 Strings. But due considering the policy assertions, there may be a policy saying, all the request should be optimized eventhough there are any optimized contents.

XOP Infosets Constructs. Axis2 will automatically identify and de-serialize any MTOM message it receives. If it is not set all the binary data in binary content nodes will be serialized as Base64 encoded strings. When Axis2 receives a SwA message it extracts the binary attachment parts and puts a reference to those parts in the Message Context.

Users can access binary attachments using the content-id. Care should be taken to rip off the "cid" prefix when content-id is taken from the "Href" attributes. When accessing the message context from a service users need to get hold of the message context from "setOperationContext " method from the service class.

Even though the representation is different, both technologies have the same wire format. Because of that Axis2 does not define a separate programming model or serialization for SwA. Note : Above is tested with Axis 1. Also a user can specify a size threshold for the File caching. When this threshold value is specified, only the attachments whose size is bigger than the threshold value will get cached in files. Smaller attachments will remain in Memory.

NOTE : It is a must to specify a directory to temporary store the attachments. The following parameters need to be set in Axis2.

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Web services users may want to transmit binary attachments of various sorts like images, drawings, XML docs, etc. Such data is often in a particular binary format. Traditionally, two techniques have been used in dealing with opaque data in XML; "By value" Sending binary data by value is achieved by embedding opaque data of course after some form of encoding as an element or attribute content of the XML component of data. The main advantage of this technique is that it gives applications the ability to process and describe data, based only on the XML component of the data. XML supports opaque data as content through the use of either base64 or hexadecimal text encoding. Both techniques bloat the size of the data. For UTF-8 underlying text encoding, base64 encoding increases the size of the binary data by a factor of 1.

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