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Java did not originally include a barrier primitive, although it is not difficult to create one using the facilities in the language, as was done in the public domain util concurrent package [Lea] In Java 2 15, similar classes are provided in the Javautilconcurrent package A CyclicBarrier is similar to the barrier described previously The Cyclic-Barrier class contains two constructors: one that requires the number of threads that will synchronize on the barrier, and another that takes the number of threads along with a Runnable object whose run method will be executed by the last thread to arrive at the barrier When a thread arrives at the barrier, it invokes the barrier's await method If a thread "breaks" the barrier by terminating prematurely with an exception, the other threads will throw a BrokenBarrierException A CyclicBarrier automatically resets itself when passed and can be used multiple times (in a loop, for example) In Fig 65, we provide a Java version of the barrier examples given previously using a CyclicBarrier The javautilconcurrent package also provides a related synchronization primitive CountDownLatch A CountDownLatch is initialized to a particular value N Each invocation of its countDown method decreases the count A thread executing the await method blocks until the value of the latch reaches 0 The separation of countDown (analogous to "arriving at the barrier") and await (waiting for the other threads) allows more general situations than "all threads wait for all other threads to reach a barrier" For example, a single thread could wait for N events to happen, or N threads could wait for a single event to happen A CountDownLatch cannot be reset and can only be used once An example using a CountDownLatch is given in the Java appendix, Appendix C 633 Mutual Exclusion When memory or other system resources (for example, a file system) are shared, the program must ensure that multiple UEs do not interfere with each other For example, if two threads try to update a shared data structure at the same time, a race condition results that can leave the structure in an inconsistent state A critical section is a sequence of statements that conflict with a sequence of statements that may be executed by other UEs Two sequences of statements conflict if both access the same data and at least one of them modifies the data To protect the resources accessed inside the critical section, the programmer must use some mechanism that ensures that only one thread at a time will execute the code within the critical section This is called mutual exclusion.

This doesn t give us any protection from putting in invalid data, and the best we can do about accessing elements by name is to create some constants so that we can write things like circle[RADIUS] = 5 But using a list brings additional problems for example, we can legitimately call circlesort()! Using a dictionary might be an alternative, for example, circle = dict(x=36, y=77, radius=8), but again there is no way to ensure a valid radius and no way to prevent inappropriate methods from being called

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database theory nor the experience with SQL Server to design an effective data model Sometimes, those databases were well designed for the technology they were implemented on; then they were simply copied and pasted (for lack of a more accurate term) onto SQL Server, often with disastrous results We thought that a book that discussed design for SQL Server would be helpful for those people redesigning an existing database to be migrated from another platform to SQL Server We ve all read that software design, and relational database design in particular, should be platform agnostic We do not necessarily disagree with that outlook However, it is important to understand which RDBMS will be hosting your design, because that can affect the capabilities you can plan for and the weaknesses you may need to account for in your design Additionally, with the introduction of SQL Server 2005, Microsoft has implemented quite a bit of technology that extends the capabilities of SQL Server beyond simple database hosting Although we don t cover every piece of extended functionality (otherwise, you would need a crane to carry this book), we reference it where appropriate to give you the opportunity to learn how this functionality can help you Within the pages of this book, we hope you ll find everything you need to help you through the entire design and development process everything from talking to users, designing use cases, and developing your data model to implementing that model and ensuring it has solid performance characteristics When possible, we ve provided examples that we hope will be useful and applicable to you in one way or another After spending hours developing the background and requirements for our fictitious company, we have been thinking about starting our own music business And let s face it reading line after line of text about the various uses for a varchar data type can t always be thrilling, so we ve tried to add some anecdotes, a few jokes, and even a paraphrased movie quote or two to keep it lively Writing this book has also been an adventure for both of us, in learning how the publishing process works, learning the finer details of writing for a mass audience, and learning that even though we are our own worst critics, it s hard to hear criticism from your friends, even if they re right; but you re always glad that they are.

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