[Jenkins] Scripted Pipeline lesson 7: Stage _ Post

node {
    try {
        stage('Build') {
            script{
                currentBuild.result = 'SUCCESS' //SUCCESS, ABORTED, UNSTABLE, OR FAILURE
            }
        }
    }
    catch(err)
    {
        //does nothing here
    }
    finally {
        def currentResult =  currentBuild.result
        //this section isis always
        echo  "always() code is executed"
        
        //changed
        if(currentBuild.previousBuild != null) {
            def previousResult = currentBuild.previousBuild.result
            if (previousResult != null && previousResult != currentResult) {
                echo 'changed() code is executed'
            }
        }
        
        //fixed
        if(currentBuild.previousBuild != null) {
            def previousResult = currentBuild.previousBuild.result
            if (previousResult != null && (previousResult == 'FAILURE'
                || previousResult == 'UNSTABLE')
                && currentResult == 'SUCCESS') {
                echo 'fixed() code is executed'
            }
        }
        
        //regression
        if(currentBuild.previousBuild != null) {
            def previousResult = currentBuild.previousBuild.result
            if (previousResult != null && (previousResult == 'FAILURE'
                || previousResult == 'UNSTABLE'
                || previousResult == 'ABORTED')
                && currentResult == 'SUCCESS') {
                echo 'regeression() code is executed'
            }
        }
        
        //aborted
        if(currentResult == 'ABORTED') {
            echo 'aborted() code is executed'
        }
        
        //failure
        if (currentResult == 'FAILURE') {
            echo 'failure() code is executed'
        }
        
        //failure
        if(currentResult == 'SUCCESS') {
            echo 'success() code is executed'
        }
        
        //unstable
        if(currentResult == 'UNSTABLE') {
            echo 'unstable() code is executed'
        }
        
        //cleanup
        echo 'cleanup() code is executed'
    }
}