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parameter inspectors that work on operation parameters At the operation level, behaviors are involved with selecting which method to invoke to run for a given SOAP input message and again to invoke that method Behaviors control the instancing and concurrency of service classes and settheir operations Instancing is controlled by the , , or Concurrency is controlled ting and can be setting and can be or by the (single, but thread-safe code) Together, these two settings control the level of concurrency of a service, from a singleton on one end of the spectrum to creating a new instance per call on the other end Service behaviors also enable you to throttle the number of concurrent calls, instances, or sessions behavior This One important service behavior is the model in behavior exposes the WCF type system and WSDL so that clients know the where, how, and what to communicate with endpoint uses the WS-MEX a service More generally, the protocol so that it can communicate with clients on different platforms and return metadata information in a variety of formats Only if a service includes this behavior will it expose WSDL This is a different experience from what many developers are used to with ASMX, which exposes WSDL by default WCF implements short-lived, ACID-style transactions in behaviors Transactions can exist within a service or can ow across service boundaries Transactions are implemented at the operation behavior level, although certain conditions must be met at the endpoint and service level For instance, to ow transactional context from the client to the service, the service endpoints must use a protocol that supports sessions, such as Sessions must be allowed at the service level to ow transactions across service boundaries Operation behaviors enable developers to specify the isolation level of transactions, and administrators can control the timeout properties WCF supports three transaction managers, one for local transactions within a process, one for Vista-only resources, and the Distributed Transaction Coordinator In addition, communication across service boundaries can use either a Windows-only transaction protocol that leverages RPC, or it can use the standards-based WS-AT protocol.

from each match of the incident_re regular expression We then extract all the key=value strings in one go using the keyvalues match group, and apply the key_value_re regular expression s refinditer() method to iterate over each individual key=value line For each (key, value) pair found, we put them in the data dictionary so all the values go in as strings Then, for those values which should not be strings, we replace them with a value of the appropriate type using the same string conversions that we used when parsing the text manually We have added a check to ensure that the data dictionary has nine items because if an incident record is corrupt, the key_valuefinditer() iterator might match too many or too few key=value lines The end is the same as before we create a new Incident object and put it in the incidents dictionary, then return True If anything went wrong, the except suite will issue a suitable error message and return False, and the finally suite will close the le One of the things that makes both the manual and the regular expression text parsers as short and straightforward as they are is Python s exceptionhandling The parsers don t have to check any of the conversions of strings to dates, numbers, or Booleans, and they don t have to do any range checking (the Incident class does that) If any of these things fail, an exception will be raised, and we handle all the exceptions neatly in one place at the end Another bene t of using exception-handling rather than explicit checking is that the code scales well even if the record format changes to include more data items, the error handling code doesn t need to grow any larger

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[ Team LiB ] [A] [B] [C] [D] [E] [F] [G] [H] [I] [J] [K] [L] [M] [N] [O] [P] [R] [S] [T] [U] [V] [W] [X] editing modes EMAILADDR embedded systems encoding:character character encoding error handling:CLDC CLDC:error handling errors CLDC:virtual machine differences:errors events action key pointer example NetClientMIDlet example:timers timers:example EXCLUSIVE EXIT 2nd [ Team LiB ]

Some programs use an XML le format for all the data they handle, whereas others use XML as a convenient import/export format The ability to import and export XML is useful and is always worth considering even if a program s main format is a text or binary format Out of the box, Python offers three ways of writing XML les: manually writing the XML, creating an element tree and using its write() method, and creating a DOM and using its write() method Similarly, for reading and parsing XML les there are four out-of-the-box approaches that can be used: manually reading and parsing the XML (not recommended and not covered here it can be quite dif cult to handle some of the more obscure and advanced details correctly), or using an element tree, DOM, or SAX parser In addition, there are also third-party XML libraries available, such as the lxml library mentioned in 5 (227 ), that are well worth investigating The aircraft incident XML format is shown in Figure 75 In this section we will show how to write this format manually and how to write it using an element tree and a DOM, as well as how to read and parse this format using the element

< xml version="10" encoding="UTF-8" > <incidents> <incident report_id="20070222008099G" date="2007-02-22" aircraft_id="80342" aircraft_type="CE-172-M" pilot_percent_hours_on_type="909090909091" pilot_total_hours="440" midair="0"> <airport>BOWERMAN</airport> <narrative> ON A GO-AROUND FROM A NIGHT CROSSWIND LANDING ATTEMPT THE AIRCRAFT HIT A RUNWAY EDGE LIGHT DAMAGING ONE PROPELLER </narrative> </incident> <incident> </incident> : </incidents>

Custom behaviors enable developers to create new behaviors at the service, endpoint, contract, or operation level These behaviors enable the inspection and modi cation of messages as they ow in and out of clients or services They also enable developers or system administrators to validate or modify the WCF runtime as services are started

tree, DOM, and SAX parsers If you don t care which approach is used to read or write the XML, you could just read the Element Trees subsection that follows, and then skip to the chapter s nal section (Random Access Binary Files; 324)

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