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Data Explorer Execution Model #!N #!EC #!N #!N Data Explorer's execution
model is based on the data flow concept. However, features are
provided that extend the data flow concept to allow you to
create a visual program that could not be supported by simple
data flow. For example, there are tools that allow you to
explicitly save partial results of a visual program to be used
in a subsequent execution. Data Explorer also provides you with various
tools to control the flow of execution of your visual programs.
Most of these tools are analogous to constructs found in commonly
used programming languages. For example, tools are provided that perform the
function of IF statements, CASE statements and FOR (or DO) loops.
This chapter discusses flow-control tools (with several examples of their use)
both individually and in combination. #!N #!N Although it is not
necessary to understand all the details of the Data Explorer execution
model in order to build and run visual programs, you may
find it helpful as you build visual programs. Other topics in
this chapter include caching of intermediate results, conditional execution using the
Route and Switch modules, iteration using the Sequencer, simple iteration using
the looping modules, preservation of state using the pairs GetLocal/SetLocal or
GetGlobal/SetGlobal, creating advanced looping constructs using combinations of tools, asynchronous data
sources, and parallelism. The tools that control the flow of execution
of a visual program are found in the Data Explorer category
#!F-adobe-times-bold-r-normal--18* Flow Control #!EF . #!N #!N #!N #!F-adobe-times-medium-i-normal--18* Next Topic
#!EF #!N #!N #!Lall263,dxall264 h Data Flow #!EL #!N #!F-adobe-times-medium-i-normal--18* #!N
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