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Service-Level Interaction Patterns
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Organizations exchange information in a variety of ways To accommodate this, an SOA needs to support a variety of service interaction patterns The most common interaction patterns are the following: Request/reply interactions Request/callback interactions One-way, store-and-forward messaging Publish/subscribe interactions In this section, we look at how Web services support these interaction patterns
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A Quick Look at SOAP and HTTP
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As illustrated in Figure 3-5, a typical HTTP operation either gets an HTML file from a remote Web server and downloads it to the local machine, or posts an HTML file from the local machine to the remote server
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Figure 3-5 Browser/HTTP interaction paradigm
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To work well over the tremendous scale of the Web, HTTP deliberately omits a very key and essential aspect of typical RPC implementationspersistent sessions There is no way (in the standards at least) to correlate requests with replies, no way for the client to know for sure whether or not the request was processed, and no mechanism to associate transaction, security, or any other context with the transport for multiple related interactions SOAP over HTTP is inherently synchronous, request/response messaging: Synchronous because it requires the sender and the receiver to be online simultaneously for data to be exchanged (Unlike asynchronous, storeand-forward techniques that do not require the sender and receiver to
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Atomic Services and Composite Services
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Sometimes it is useful to categorize services into atomic services and composite services (see Figure 3-10)
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Figure 3-10 Atomic services and composite services
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Atomic services do not rely on other services and are usually associated with straightforward business transactions or with executing data queries and data updates Composite services use other services In all other respects, composite services are just like any other service, in that they: Have a well-defined service contract Are registered in the service registry, can be looked up via the service registry, and can be invoked like any other service provider Are deployed, managed, and secured like other services Can look up and use other services, including other composite services Composite services can be defined either declaratively (using WS-BPEL) or programmatically (using a programming languagePython, Perl, Java, C++, or C#) The declarative approach provides more flexibility because it is easier to change The programmatic approach may be more appropriate when specialized processing is required Some composite services model a single business transaction (such as retrieving a single view of the customer),
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Generating Proxies and Skeletons from Service Contracts
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One of the advantages of well-defined service contracts is that tools can be used to generate service proxies and service skeletons based on the WSDL Service proxies are programming language classes that represent the service and that can be incorporated into service requesters to simplify invoking them Service skeletons are programming language classes that provide the framework for implementing new services The main advantages of generating and using service proxies and service skeletons is that developers can work with familiar programming language constructs when invoking and implementing services without having to deal with lowlevel WSDL and SOAP details Most Web services products and IDEs provide this capability
Generating Java Classes from Service Contracts
Here is an example of a Java service proxy class generated from the CalendarService WSDL (refer to Listing 3-1):
public interface CalendarComputation extends javarmiRemote { public Timestamp computeFinalTimestamp( Timestamp initialTimestamp,Duration duration); public Timestamp computeInitialTimestamp( Timestamp finalTimestamp,Duration duration); public Duration computeDuration( Timestamp initialTimestamp,Timestamp finalTimestamp); public Duration millisToDuration(long millis); public long durationToMillis(Duration duration); public Timestamp millisToTimestamp(long millis,TimeZoneId timeZoneId); public long timestampToMillis(Timestamp timestamp); }
As you can see, CalendarComputation is a Java service proxy class that models the calendar service and provides methods that model the operations of the calendar service Here is an example of a Java service skeleton class generated from the CalendarService WSDL (refer to Listing 3-1 ):
public class CalendarComputationImpl { public Timestamp computeFinalTimestamp( Timestamp initialTimestamp,Duration duration) { // User code goes in here return new comionaCalendarServiceTimestamp(); } public Timestamp computeInitialTimestamp( Timestamp finalTimestamp,Duration duration) { // User code goes in here return new comionaCalendarServiceTimestamp(); } public Duration computeDuration( Timestamp initialTimestamp,Timestamp finalTimestamp) { // User code goes in here return new comionaCalendarServiceDuration(); } }
As you can see, CalendarComputationImpl is a Java service skeleton class that provides the framework for implementing the CalendarService