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keeping items queued up and processing fewer at a time is likely to result in better overall performance. The simplest way to use the thread pool is through its QueueUserWorkItem method. Example 16-6 shows a modification to the previous examples rather than creating threads, it uses the thread pool. QueueUserWorkItem takes a delegate to any method that accepts a single object as its argument, so it s happy with the same Go method as Example 16-2. (Unlike the Thread constructor, there s no overload that accepts a method without an argument the thread pool insists on there being an argument whether you have a use for one or not.)

MessageConnection mms = (MessageConnection)Connector.open ("mms://+14155550100"); MultipartMessage birthMessage = (MultipartMessage)mms.newMessage (MessageConnection.MULTIPART_MESSAGE); birthMessage.addAddress("to", "+14155550101"); birthMessage.addAddress("to", "aunt.dotty@server.com"); birthMessage.addAddress("bcc", "my_email@work.com"); birthMessage.setSubject("The moment you've been waiting for..."); birthMessage.setStartContentId("start"); birthMessage.addMessagePart(textMessagePart); birthMessage.addMessagePart(imageMessagePart); birthMessage.addMessagePart(smilMessagePart);

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Note especially line 4, with the operation view pushed predicate. This is the critical line that tells you that the optimizer is pushing predicates. You will also note, however, that lots of filter predicates are listed, and that there are four separate occurrences of filter predicates of the form colX >= 10 and colX <= 50. The filter predicates in lines 5, 7, and 9 are actually redundant and disappear in 10g in fact, the filter operation in line 5 of the execution plan itself disappears completely in 10g. However, it is quite convenient that these predicates appeared in this example, as it allows me to point out that they are not there as the result of predicate pushing, rather they are there as a result of transitive closure, and could appear even in cases where you don t see a pushed predicate line. Technically, pushing predicates is about join predicates, which in this example is the access predicate of line 7.

No content is added in the page event until a page has been completed. The header and footer are written to the direct content in the onEndPage() method. The parameters writer and document are to be used in the same way as done in section 5.2. Note that you ask the writer for the art box rectangle using the getBoxSize() method. You use this rectangle to position the header and the footer. This will only work if you ve defined that specific page boundary between steps 2 and 3 in the PDF creation process. Otherwise, the getBoxSize() method will return null. Why is it not advised to add content in the onStartPage() method You ll remember from section 5.2.4 that iText ignores newPage() calls when the current page is empty. This method is executed or ignored when you call it explicitly from your code, but it s also invoked implicitly from within iText on multiple occasions. It s important that it s ignored for empty pages; otherwise you d end up with plenty of unwanted new pages that are unintentionally left blank. If you add content in an onStartPage() method, there s always a risk of having unwanted pages. Consider it more safe to reserve the onEndPage() method for adding content.

Numeric types aren t implicitly converted conversions between different numeric types must be made explicitly. You do this by using overloaded conversion operators. These work the same way as overloaded infix operators such as + and *. Table 3-4 shows the primary conversion operators.

Now that we have a swirling lines class, let s add it into our application class, LightShow. We also want to create some kind of psychedelic color effect as well. Listing 5.4 shows how the updates change the code.

private var yahooMap:YahooMap; private var location:String = "1 market, san francisco, ca"; private var address:Address = new Address(location);

filter_cost_01.sql push_subq.sql ord_pred.sql filter_cost_02.sql filter_cost_01a.sql scalar_sub_01.sql scalar_sub_02.sql scalar_sub_03.sql with_subq_01.sql with_subq_02.sql view_merge_01.sql push_pred.sql unnest_cost_01.sql unnest_cost_02.sql unnest_cost_01a.sql semi_01.sql anti_01.sql book_subq.sql notin.sql ordered.sql star_trans.sql star_join.sql intersect_join.sql setenv.sql

The important thing to note about the Hex class is that it has a String-argument constructor. When Ant populates an object from its attributes and encounters a setter with an argument type that it does not recognize natively, it attempts to instantiate that object with a String constructor using the value of the attribute. The setter within our task is simply:

Listing 13-1. Button1_Click()

Note anacron is run as the root user, so if you do add your own entry to anacrontab, any files it creates

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