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Comparing the plugin interface for image filters with the interface for image file formats, there is a small but important difference: the filter plugins can contain only one filter per plugin, while there can be several file formats in one plugin because of the way you design the plugin interface. The file format plugin can be considered a file format factory, so the plugin serves the application with file formats instead of handling them directly. Making plugins act as factories can be very useful because the actual working classes that are created using the factory can share code and inherit each other. You can also simplify the deployment by grouping plugins into a few large plugins instead of having to deal with large amounts of smaller ones. It is even possible to combine several different types of plugins in one single plugin by using smart factory interfaces. Instead of splitting out FilterInterface into a FilterPluginInterface and a FilterWorker, you can quite easily extend the FilterInterface to be able to handle several filter operations through one interface. Doing this requires changes to the interface itself, which means changes to all the plugins as well as to the application itself.

Blogger was how people found out who we were, within a community that was at first San Francisco based web design geeks but bled into a lot of different communities, like Silicon Valley and a lot of leading Internet thinkers. They were attracted to publishing blogs, and this was a thing you used to do that. So it got us known a little bit, which was very helpful. For example, we met Jerry Michalski, who emailed out of the blue and then became an advisor. Jerry knows everybody and was tremendously helpful.

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#light let rec findSequence l = match l with | [x; y; z] -> printfn "Last 3 numbers in the list were %i %i %i" x y z | 1 :: 2 :: 3 :: tail -> printfn "Found sequence 1, 2, 3 within the list" findSequence tail | head :: tail -> findSequence tail | [] -> () let testSequence = [1; 2; 3; 4; 5; 6; 7; 8; 9; 8; 7; 6; 5; 4; 3; 2; 1] findSequence testSequence The results of this example, when compiled and executed, are as follows: Found sequence 1, 2, 3 within the list Last 3 numbers in the list were 3 2 1 Because pattern matching is such a common task in F#, the language provides an alternative shorthand syntax If the sole purpose of a function is to pattern match over something, then it may be worth using this syntax.

The changes to the interface are made so that each FilterInterface can return several names, and the filter can be specified when calling the filter method. The source code for the new FilterInterface is shown in Listing 11-30 (compare it with the original interface shown in Listing 11-15 and Listing 11-16). The name method has been renamed to names and returns a QStringList instead of a QString. The filter method has been given a new argument, specifying the name of the filter to use. Finally, the version number in the identifier string passed to the Q_DECLARE_INTERFACE macro has been updated to indicate that the interface has changed and that older plugins are not compatible. Listing 11-30. The new FilterInterface can handle several filters through one interface. class FilterInterface { public: virtual QStringList names() const = 0;

People were using our other app, too, a little bit, but it wasn t very mature because it was much more complicated. In early 2000, we started actually raising money, and O Reilly invested in us. They were some of the only people I knew. I guess I left an OK impression on O Reilly. I only worked there for seven months as an employee and then another couple as a contractor doing a completely different job, but left a good enough impression that I was able to go back there and say, Hey, look at this thing. They were aware of Blogger, but we were still doing Pyra, too, and they agreed to invest.

Livingston: So, you had Blogger out there but you weren t totally focused on it. Were you worried that competitors, since it was a simple thing, would try to copy it Williams: There were a couple other products out there, but they weren t very

virtual QImage filter( const QString &filter, const QImage &image ) const = 0; }; Q_DECLARE_INTERFACE( FilterInterface, "se.thelins.CustomPlugin.FilterInterface/0.2" ) It is important to establish whether it is the responsibility of the application or the plugin to make sure that no invalid filter name is ever passed as an argument to a filter method. If that occurs, the plugins must be ready for it (and not crash the entire application).

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