#!/usr/local/bin/perl
#
# Important Note:
# This script must be presented as %AUTO_HOME%/dte/DTE/scripts/diScripts/kcscripts/utils/ReadAndExecuteLinesFromFile.pl
# In AIME label ADE view, %AUTO_HOME% is the same as $ADE_VIEW_ROOT/dte/DTE3
#
use File::Copy;
use File::Basename;
#Usage: perl ReadAndExecuteLinesFromFile.pl import.txt export.txt runtime.txt
# BEGIN SUPPORTING FILES
## Notes in this "BEGIN END comments" section:
## a line starting with ## will be ignored when parsing by DTE runtime
## a line starting with single # will be used to get supporting files of the block
## all the paths must be relative to DTE's AUTO_HOME, no need to list DTE CORE files here
## to include a specific file foo.bar: # scripts/product/release/foo.bar
## to include all files with extension xyz, use wildcard *:
# scripts/product/release/*.xyz
## to include all files in subdir 'foodir' (non-recursive):
# scripts/product/release/foodir/*
## to include everything under subdir 'bardir' recursively:
# scripts/product/release/bardir
# END SUPPORTING FILES
# use BEGIN block to add DTE.pm into @INC
BEGIN
{
use File::Basename;
use Cwd;
$orignalDir = getcwd();
$scriptDir = dirname($0);
chdir($scriptDir);
$scriptDir = getcwd();
$plibDir = "$scriptDir/../../../plib";
chdir($plibDir);
$plibDir = getcwd();
# add $plibDir into INC
unshift (@INC,"$plibDir");
chdir($orignalDir);
}
require DTE;
if ( $#ARGV < 2)
{
print ("Usage: perl $0 import.txt export.txt runtime.txt\n");
exit 1;
}
$importfile = $ARGV[0];
$exportfile = $ARGV[1];
$runtimefile = $ARGV[2];
######## Initialize Global Variables #################
# Import Parameters will be put into hashtable %ImportParamTable
%ImportParamTable = ();
# The keys of hashtable %ImportParamTable are as follows:
$HOSTNAME = "%HOST%";
$FilePathToRead="";
# Runtime Parameters will be put into hashtable %RuntimeParamTable
# When adding your own code below, you may find these variables are useful and handy
%RuntimeParamTable = ();
# The keys of hashtable %RuntimeParamTable are as follows:
# WORKDIR - the workdir of the current task(block)
# AUTO_HOME - the AUTO_HOME dir
# AUTO_WORK - the AUTO_WORK dir
# ENVFILE - the property file which has all the ENV variables dump
# TASK_ID - the Task ID for the current task(block) in topology definition
# JAVA_HOME - the JAVA_HOME from where the DTE runtime java interpretor comes
# Export Parameters should be put into hashtable %ExportParamTable
# The operation of the block must determine the value of each export parameter
# with the exception that $ExportParamTable{HOSTNAME} always equals to
# $ImportParamTable{HOSTNAME}
%ExportParamTable = ();
# The export parameters are listed as follows:
# HOSTNAME
# EXIT_STATUS
# OutputFileWithStatus
$OutputFileWithStatus="";
# the exit_value for this program
$exit_value=0;
#################### Program Main Logic ###################
############ Parse Runtime File runtime.txt #######
%RuntimeParamTable=DTE::parse_runtime_file($runtimefile);
############ Parse Import File import.txt ##########
## All import parameters are in hashtable %ImportParamTable
%ImportParamTable = DTE::parse_import_file($importfile, %RuntimeParamTable);
$FilePathToRead=$ImportParamTable{FilePathToRead};
############ Set Initial/Default Values for Mandatory Export Params ####
# Value for EXIT_STATUS ought to be changed based on operation outcome!
$ExportParamTable{HOSTNAME} = $ImportParamTable{HOSTNAME};
$ExportParamTable{OutputFileWithStatus} = $OutputFileWithStatus;
$ExportParamTable{EXIT_STATUS}="SUCCESS";
############### Here is the Operation of the block #########
# To do what the block is supposed to do and generate values for export parameters
ReadAndExecuteLinesFromFile();
############### Populate Export file with export param info ##############
DTE::populate_export_file($exportfile, %ExportParamTable);
# End the Main Logic here
exit $exit_value;
################# Program Subroutines For Block Logic ################
#
# ADD YOUR CODE BELOW
#
# Subroutine operation() is to accomplish the goal of this block - do the real job
# and generate values for all the exported parameters listed in block definition.
# The workdir of this block is $RuntimeParamTable{WORKDIR}, temporary files and subdir
# can be created in this workdir as needed
#
sub ReadAndExecuteLinesFromFile
{
print "\n ------- Reading File: $FilePathToRead -------\n\n";
open my $info, $FilePathToRead or die "Could not open $FilePathToRead: $!";
while( my $line = <$info>) {
print $line;
last if $. == 2;
}
close $info;
}
#
# ADD YOUR SUPPORTING ROUTINE(S) BELOW, IF ANY
#
#
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There is no need to specify the type of the data in Perl as it is loosely typed language.
| Type | Description | Usage |
|---|---|---|
| Scalar | Scalar is either a number or a string or an address of a variable(reference) | $var |
| Arrays | Array is an ordered list of scalars, you can access arrays with indexes which starts from 0 | @arr = (1,2,3) |
| Hash | Hash is an unordered set of key/value pairs | %ul = (1,'foo', 2, 'bar) |
In Perl, there is no need to explicitly declare variables to reserve memory space. When you assign a value to a variable, declaration happens automatically.
$var-name =value; #scalar-variable
@arr-name = (values); #Array-variables
%hashes = (key-value pairs); # Hash-variables
If, If-else, Nested-Ifs are used when you want to perform a certain set of operations based on conditional expressions.
if(conditional-expression){
//code
}
if(conditional-expression){
//code if condition is true
}else{
//code if condition is false
}
if(condition-expression1){
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...
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There is no case or switch in perl, instead we use given and when to check the code for multiple conditions.
given(expr){
when (value1)
{//code if above value is matched;}
when (value2)
{//code if above value is matched;}
when (value3)
{//code if above value is matched;}
default
{//code if all the above cases are not matched.}
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Sub-routines are similar to functions which contains set of statements. Usually sub-routines are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
sub subroutine_name
{
# set of Statements
}
subroutine_name();
subroutine_name(arguments-list); // if arguments are present