Haxe Process Expression Language (HPEL)

Create cross-platform, multi-threaded, software process quickly via XML and/or DSL.

Note: very much a work in progress

TODO:

• Aggregation strategies
• Error handling strategies
• Error handling scopes
• Service repository (plus service adaptors, eg: SQL, Files, HTTP, FTP, etc)
• Service invocation framework
• https://github.com/ianharrigan/hpel/blob/master/src/haxe/processing/hpel/Process.hx#L218
• Much more!

Some examples

Sequences

DSL	XML
.beginSequence() .beginSequence() .log("start sequence 1") .delay(.5) .log("end sequence 1") .endSequence() .beginSequence() .log("start sequence 2") .delay(.5) .log("end sequence 2") .endSequence() .beginSequence() .log("start sequence 3") .delay(.5) .log("end sequence 3") .endSequence() .endSequence()	<sequence> <sequence> <log message="start sequence 1" /> <delay seconds=".5" /> <log message="end sequence 1" /> </sequence> <sequence> <log message="start sequence 2" /> <delay seconds=".5" /> <log message="end sequence 2" /> </sequence> <sequence> <log message="start sequence 3" /> <delay seconds=".5" /> <log message="end sequence 3" /> </sequence> </sequence>

Parallel (Threads)

DSL	XML
.beginParallel() .beginSequence() .log("start thread 1") .delay(15) .log("end thread 1") .endSequence() .beginSequence() .log("start thread 2") .delay(10) .log("end thread 2") .endSequence() .beginSequence() .log("start thread 3") .delay(5) .log("end thread 3") .endSequence() .endParallel()	<parallel> <sequence> <log message="start thread 1" /> <delay seconds="15" /> <log message="end thread 1" /> </sequence> <sequence> <log message="start thread 2" /> <delay seconds="10" /> <log message="end thread 2" /> </sequence> <sequence> <log message="start thread 3" /> <delay seconds="5" /> <log message="end thread 3" /> </sequence> </parallel>

Variables

DSL	XML
.beginSequence() .set("var1", 100) .beginSequence() .set("scopedVar", 200) .set("result", "${var1 + scopedVar}") .log("result = ${result}") .endSequence() .beginSequence() .set("scopedVar", 300) .set("result", "${var1 + scopedVar}") .log("result = ${result}") .endSequence() .endSequence()	<sequence> <set var="var1" value="100" /> <sequence> <set var="scopedVar" value="200" /> <set var="result" value="${var1 + scopedVar}" /> <log message="result = ${result}" /> </sequence> <sequence> <set var="scopedVar" value="300" /> <set var="result" value="${var1 + scopedVar}" /> <log message="result = ${result}" /> </sequence> </sequence>

Loops

DSL	XML
.beginSequence() .beginLoop([15, 10, 5], "delay") .log("delaying for ${delay} seconds") .delay("${delay}") .log("${delay} second delay complete") .endLoop() .endSequence()	<sequence> <loop items="[15, 10, 5]" var="delay"> <log message="delaying for ${delay} seconds" /> <delay seconds="${delay}" /> <log message="${delay} second delay complete" /> </loop> </sequence>

Loops (Threaded)

DSL	XML
.beginParallel() .beginLoop([15, 10, 5], "delay") .log("delaying for ${delay} seconds") .delay("${delay}") .log("${delay} second delay complete") .endLoop() .endParallel()	<parallel> <loop items="[15, 10, 5]" var="delay"> <log message="delaying for ${delay} seconds" /> <delay seconds="${delay}" /> <log message="${delay} second delay complete" /> </loop> </parallel>

Conditionals

DSL	XML
.beginSequence() .set("testVar", 0) .beginChoose() .when("${testVar >= 1}") .log("1 or greater! (value=${testVar})") .when("${testVar < 0}") .log("less than 0! (value=${testVar})") .otherwise() .log("Guess it must be zero! (value=${testVar})") .endChoose() .endSequence()	<sequence> <set var="testVar" value="0" /> <choose> <when condition="${testVar >= 1}"> <log message="1 or greater! (value=${testVar})" /> </when> <when condition="${testVar < 0}"> <log message="less than 0! (value=${testVar})" /> </when> <otherwise> <log message="Guess it must be zero! (value=${testVar})" /> </otherwise> </choose> </sequence>