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-rw-r--r--entries/perryliao/fib.groovy48
1 files changed, 48 insertions, 0 deletions
diff --git a/entries/perryliao/fib.groovy b/entries/perryliao/fib.groovy
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+pipeline {
+ agent any
+
+ parameters {
+ string defaultValue: '2', description: 'Number to compute in the Fibonacci Sequence', name: 'num', trim: true
+ }
+
+ stages {
+ stage('Create Cache') {
+ steps {
+ script {
+ if (!fileExists("fibbonacciCache")) {
+ sh 'echo "0\n1" > fibbonacciCache'
+ }
+ }
+ }
+ }
+ stage('Validate Parameter') {
+ steps {
+ script {
+ assert params.num.isInteger()
+ }
+ }
+ }
+ stage('Get Fibbonacci') {
+ steps {
+ script {
+ result = fib(params.num.toInteger())
+ println("The result is F(${params.num}) = ${result}")
+ }
+ }
+ }
+ }
+}
+
+int fib(int n, cache = 'fibbonacciCache') {
+ nComputed = sh(returnStdout: true, script: "wc -l < ${cache}").trim().toInteger()
+ if (n >= nComputed) {
+ // Need to do more recursion
+ result = fib(n - 2, cache) + fib(n - 1, cache)
+ sh "echo '${result}' >> ${cache}"
+ return result
+ } else {
+ // Already have what we need, so read from cache
+ return sh(returnStdout: true, script: "sed -n '${n + 1}p' ${cache}").trim().toInteger()
+ }
+}
+