RetryStep.java

// src/main/java/acme/RetryStep.java
ppackage acme;

class RetryStep extends GroovyStep {
    private int times;

    @DataBoundConstructor
    public RetryStep(int times) {
        this.times = times;
    }

    public int getTimes() {
        return times;
    }

    @Extension
    public static class DescriptorImpl extends GroovyStepDescriptor {
        @Override public String getFunctionName() {
	        return "retry";
        }

        @Override public String getDisplayName() {
	        return "Retry step";
        }
    }
}

RetryStepExecution.groovy

// src/main/resources/acme/RetryStepExecution.groovy

// this entire file gets CPS transformed & executed accordingly
public class RetryStepExecution extends GroovyStepExecution {
    public Object call(Closure body) {
        // should allow arbitrary code in trusted classpath
        int attempt = 0;
        while (true) {
            try {
                echo "trying ${attempt}"
                body();
                return;
            } catch (Exception e) {
                if (attempt++ < step.times) {
                    continue; // retry
                } else {
                    throw e;
                }
            }
        }
    }
}