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The command that is to be executed. This is the only required parameter. Speci es the working directory. Speci es the timeout, in milliseconds. After the amount of time speci ed has passed, the command will be terminated. By default there is no timeout, so a command will be allowed to execute inde nitely. Output property containing the exit code returned by the execute command. If true, then the Exec task will not fail the build based on the exit code. Otherwise the build is failed for any non-zero exit code. Currently there is a bug related to this in which, if this value is set to true and an error message has been logged, the build should fail but doesn t.

respond, You know, something you don t expect to happen Then they add, If you re reading bytes from a file, eventually you ll reach the end of the file So because you expect this, an exception shouldn t be raised when you reach the end of the file Instead, the Read method should return some special value when the end of the file is reached" Here s my response: I have an application that needs to read a 20 byte data structure from a file However, for some reason, the file contains only 10 bytes In this case, I m not expecting to reach the end of the file while reading But because I ll reach the end of the file prematurely, I d expect an exception to be thrown Wouldn t you In fact, most files contain structured data.

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(i.e., MessageProducer and MessageConsumer objects). If you wish to produce and consume messages using multithreading, you must create a different Session object for each thread. The createSession() method has two parameters:

It s rare that applications read bytes from a file and process them one at a time until the end of the file is reached For this reason, I think it makes more sense to have the Read method always throw an exception when attempting to read past the end of a file Important Many developers are misguided by the term exception handling These developers believe that the word exception is related to how frequently something happens For example, a developer designing a file Read method is likely to say the following: "When reading from a file, you will eventually reach the end of its data Since reaching the end will always happen, I ll design my Read method so that it reports the end by returning a special value; I won t have it throw an exception.

" The problem with this statement is that it is being made by the developer designing the Read method, not by the developer calling the Read method When designing the Read method, it is impossible for the developer to know all the possible situations in which the method gets called Therefore, the developer can t possibly know how often the caller of the Read method will attempt to read past the end of the file In fact, since most files contain structured data, attempting to read past the end of a file is something that rarely happens Another common misconception is that an exception identifies an error The term error implies that the programmer did something wrong However, again, it isn t possible for the developer designing the Read method to know when the caller has called the method incorrectly for the application.

Only the developer calling the method can determine this, and therefore only the caller can decide if the results of the call indicate an "error" So you should avoid thinking, "I ll throw an exception here in my code to report an error" In fact, because exceptions don t necessarily indicate errors, I ve avoided using the term error handling throughout this entire chapter (except for this sentence, of course) The preceding note explained what exception does not mean Now I ll describe what it does mean An exception is the violation of a programmatic interface s implicit assumptions For example, when designing a type, you first imagine the various situations for how the type will be used Then you define the fields, properties, methods, events, and so on for the type.

By the way, while still a performance hit, it is safe to release a lock in a finally block if the code in the try block reads the state without attempting to modify it .

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