algorythmist

algorythmist

@Bean
@StepScope
FlatFileItemReader<BankTransaction> transactionFileReader(@Value("#{jobParameters['filename']}") String filename) {
    //The properties we want to map to the BankTransaction bean in the order they appear in the file
    //columns that we do not wish to map are marked with X
    String[] properties = new String[] {"X", "transactionId", "accountId", "date", "type", "X", "amount"};
    //The LineTokenizer describes how to parse a line into tokens
    DelimitedLineTokenizer lineTokenizer = new DelimitedLineTokenizer();
    lineTokenizer.setDelimiter(",");
    //The fields (columns) of the file to include. In this case same as the length of the properties

algorythmist

JobParametersBuilder builder = new JobParametersBuilder();
JobParameters parameters = builder
                .addString("scriptFilename", "create_transaction_table.sql")
                .addLong("currentTime", System.currentTimeMillis())
                .toJobParameters();
JobExecution execution = jobLauncher.run(executeScriptJob, parameters);

algorythmist

@Bean
@StepScope
FlatFileItemReader<BankTransaction> 
    transactionFileReader(@Value("#{jobParameters['filename']}") String filename) {
    ...
}

algorythmist

@Component
public class ExecuteScriptTasklet implements Tasklet {

    @Override
    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
        String scriptFilename = chunkContext.getStepContext().getStepExecution()
                .getJobParameters().getString("scriptFilename");
        if (scriptFilename == null) {
            throw new IOException("Parameter 'scriptFilename' is not defined.");
        }

algorythmist

JobParametersBuilder builder = new JobParametersBuilder();
JobParameters parameters = builder
        .addString("scriptFilename", "create_transaction_table.sql")
        .toJobParameters();
JobExecution execution = jobLauncher.run(executeScriptJob, parameters);

algorythmist

@Bean
Step executeScriptStep() {
      return stepBuilderFactory.get("executeScriptTasklet")
                .tasklet(executeScriptTasklet)
                .build();
 }

algorythmist

@Component
public class ExecuteScriptTasklet implements Tasklet {

    @Override
    public RepeatStatus execute(StepContribution stepContribution, ChunkContext chunkContext) throws Exception {
            ...
             
         return RepeatStatus.FINISHED;
    }
}

algorythmist

fun divide(dividend: ComplexPolynomial,
           divisor: ComplexPolynomial): Pair<ComplexPolynomial, ComplexPolynomial> {

    var quotient = ComplexPolynomial.ZERO
    var remainder = dividend
    val divisorDegree = divisor.degree
    var remainderDegree = remainder.degree
    while (!isZero(remainder) && remainderDegree >= divisorDegree) {

        val c = remainder[remainderDegree] / divisor[divisorDegree]

algorythmist

class ComplexPolynomial(vararg coefficients: Complex) {

    private val coefficients = create(arrayOf(*coefficients))

    //discard leading zero coefficients from the right
    private fun create(coeff: Array<Complex>): Array<Complex> {
        var n = coeff.size
        while ((n > 1) && coeff[n - 1].isZero(TOLERANCE)) --n
        return coeff.sliceArray(IntRange(0, n - 1))
    }