Velocity ProMagix PCX Specifikace stáhnout pdf (Strana 110)

104 PC MAGAZINE NOVEMBER 6, 2007

SOLUTIONS SOFTWARE

coction to suit your taste. It requires no

coding—just drag and drop data sources

and operators onto the Yahoo! Pipes work-

space and tie them together.

The most immediately valuable appli-

cation of a Yahoo! Pipes project is to

manipulate the contents of one or more

RSS feeds to produce a new RSS feed tai-

lored to a speciﬁ c purpose. As a primitive

example, we’ll remix an RSS feed from

PC Magazine and another from Yahoo!

to generate a uniquely useful result. That

only scratches the surface of what’s possi-

ble with Yahoo! Pipes, but it’s a good place

to begin.

When you ﬁ rst sign on to Yahoo! Pipes,

you’ll see listings of Pipes projects that

have already been created by others and

published for public use. You can run those

projects, copy them, modify their source

code to create your own project, and even

subscribe to the results in your favorite

RSS reader. Most are pretty easy to ﬁ gure

out. You can learn a lot from examining

other people’s projects, even if you opt not

to use them as a data source for a pipe of

your own.

Q

1

GET STARTED

To begin, drag a source module from the list on

the left to the main workspace to reveal a dialog

box in which you can enter sources, instructions,

or operations. In this case, we’ve dragged in the

Fetch Feed module, which will capture data from

an RSS feed.

The Debug window at the bottom of the

screen shows the results of the currently

selected module. In this case, it simply dis-

plays the contents of the feed we speciﬁ ed in

the Fetch Feed module.

Drag the circle at the bottom of one mod-

ule to the circle at the top of another to create

a “pipe” that moves data between them. The

Pipe Output module simply makes the data in

your Pipes project available through an RSS

feed or Java.

If you need to learn more about how a

module functions, click the question-mark

button at the upper right-hand corner of

the module dialog box to reveal a small help

window at the lower right-hand corner of the

Pipes workspace.

2

SELECT DATA

Once you’ve chosen a feed to fetch, you can

manipulate the data in the feed by choosing

an operator; drag the operator in from the

list on the left. The Filter module includes or

excludes items according to the parameters

you select. In this case we’re ﬁ ltering the PC

Magazine Editors’ Choice RSS feed to limit the

feed to items containing the word bluetooth.

EDITOR’S TIP

READY-MADE MASHUPS If y

ou want to take

advantage of the mashup possibilities but

creating a Pipes project doesn’t ﬂ oat your

boat, look around the list of existing Pipes to

see if someone has already created the project

you need. An even better place to search for

existing mashups is ProgrammableWeb (www

.programmableweb.com), a clearinghouse of

mashups, APIs, tools, and other mashup-

related resources.

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