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With compile-time weaving, the weaver is a program that, prior to any execution, produces an application code in which the classes are extended by the aspects AspectJ, which is presented in detail in 3, is the most well-known compile-time aspect weaver A compile-time weaver is very similar to a compiler and is often referred to as an aspect compiler or even as a compiler With modern object-oriented languages, such as Java and C#, applications are compiled into intermediate bytecode When weaving aspects with these applications, two solutions can be envisioned: weaving the aspects with the source code, or weaving them with the bytecode Bytecode weaving is more common than source-code weaving A bytecode weaver can weave commercial and third-party applications that do not make their source code available Furthermore, a bytecode weaver is generally simpler to program.

messages over a network protocol, most commonly HTTP. SOAP is heavily dependent on XML, and every SOAP message is an XML document that contains several elements (such as Envelope, Header, and Body). The SOAP header contains application-specific infrastructure data, such as security information. The SOAP body contains the message being exchanged between applications. While the SOAP header is optional for a SOAP message, the SOAP envelope and body are mandatory. Here is an example of a SOAP message with an empty header. The body includes an XML representation of ActionBazaar s addBid method with its parameters:

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" SOAP-ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <SOAP-ENV:Header/> <SOAP-ENV:Body> <addBid xmlns="http://actionbazaar.com/Bidding"> <user-id>viper</user-id> <item-id>100</user-id> <bid-price>2000.24</bid-price> </addBid> </SOAP-ENV:Body> </SOAP-ENV:Envelope>

An entity bean example The entity bean example in listing 2.2 illustrates the same tags as the previous session bean example.

This snippet shows the skeleton of each and every SOAP message. The message starts off with an Envelope, which typically declares a namespace and may include encoding. Immediately inside the Envelope is the Header, which is optional. This contains meta-information about the message, such as security, network routing, and other data required to get the message to its destination. The last piece of the SOAP message is the Body, which in the case of our example, defines the addBid method and its associated parameters. Describing a web service: WSDL The Web Services Description Language (WSDL) is central to a web service because it describes the service to possible consumers. It specifies the message type, port, supported operations, data types, and all other details about how the web service works, where it can be found, and what the client should expect in return. Listing 15.1 shows a sample WSDL for ActionBazaar s PlaceBidService.

The structure and the grammar of a source language such as Java are much more complex than that of the associated bytecode The bytecode is therefore simpler to parse and analyze A direct consequence of this increased simplicity is that the performance of a bytecode weaver is often superior to that of a source-code weaver The output of a compile-time weaver can be either source code or bytecode However, in the case of bytecode weaving, the output is always bytecode The advantage of generating source code is that it can be easily read by a programmer, who can then study the weaving process and understand what the weaver has done The disadvantage of generating source code is that this code must then be compiled into bytecode, which slows down the codeproduction chain In many cases, fast weaving strategies are preferred.

< xml version = '1.0' encoding = 'UTF-8' > <definitions xmlns="http://schemas.xmlsoap.org/wsdl/" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/" xmlns:soap ="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd

package ch2; import javax.ejb.*; /** * @ejb.bean type="CMP" Declares the bean * view-type="both" attributes */ public abstract class DataBean implements EntityBean { public void setEntityContext( EntityContext context) {} public void unsetEntityContext( ) {} public public public public public void void void void void ejbRemove() {} ejbLoad() {} ejbStore() {} ejbActivate() {} ejbPassivate() {}

="http://www.w3.org/2001/XMLSchema" xmlns:mime ="http://schemas.xmlsoap.org/wsdl/mime/" xmlns:tns ="http://ejb3inaction.example.buslogic/" name="PlaceBidBeanService" targetNamespace="http://ejb3inaction.example.buslogic/"> <types> Data types <schema xmlns="http://www.w3.org/2001/XMLSchema" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:xsi= "http://www.w3.org/2001/XMLSchema-instance" xmlns:soap11-enc= "http://schemas.xmlsoap.org/soap/encoding/" targetNamespace= "http://ejb3inaction.example.buslogic/" elementFormDefault="qualified"> <element name="addBid" type="tns:addBid"/> <complexType name="addBid"> <sequence> <element name="userId" type="string" nillable="true"/> <element name="itemId" type="long" nillable="true"/> <element name="bidPrice" type="double" nillable ="true"/> </sequence> </complexType> <element name="addBidResponse" type="tns:addBidResponse"/> <complexType name="addBidResponse"> <sequence> <element name="return" type="long" nillable="true"/> </sequence> </complexType> </schema> </types> <message name="PlaceBidBeanPortType_addBid"> Messages <part name="parameters" element="tns:addBid"/> </message> <message name="PlaceBidBeanPortType_addBidResponse"> <part name="parameters" element="tns:addBidResponse"/> </message> <portType name="PlaceBidBean"> Port types <operation name="addBid"> <input message="tns:PlaceBidBeanPortType_addBid"/> <output message="tns:PlaceBidBeanPortType_ addBidResponse"/> </operation> </portType> <binding name="PlaceBidBeanSoapHttp" type="tns:PlaceBidBean"> SOAP binding <soap:binding style="document" transport="http://schemas.xmlsoap.org/soap/http"/> <operation name="addBid"> Operations <soap:operation soapAction=""/> <input> <soap:body use="literal"/> </input> <output> <soap:body use="literal"/>

</output> </operation> </binding> <service name="PlaceBidBeanService"> Service <port name="PlaceBid" Port binding="tns:PlaceBidBeanSoapHttp"> <soap:address location="${oracle.scheme.host.port. and.context}/PlaceBid"/> </port> </service> </definitions>

That is why early versions of AspectJ generated source code, but versions 11 and later generate bytecode With compile-time weaving, aspects are added to the application code When executed, this new code does not make any distinction between the original code and the code that comes from the aspects This weaving is thus said to be static To remove or add an aspect, a total reweaving of the application is needed..