Groovy Closures
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Some of my team have been impressed with Groovy’s support for closures:
Here is a simple closure:
def time(String message, Closure body) {
def start = Instant.now()
def result = body.call()
def finish = Instant.now()
Duration duration = Duration.between(start, finish)
log.info("$message took $duration")
result
}
This would allow you to go from:
def value = complexDatabaseQuery(1, 2, 3)
to
def msg = "Complex query 1, 2, 3"
def value = time(msg, {complexDatabaseQuery(1, 2, 3)})
This provides a simple decorating wrapper that records the time that the database call took without making the code less readable.
This could be made more sophisticated using:
def warnSlow(String message, def max_duration_in_seconds = 5, Closure body) {
def start = Instant.now()
def result = body.call()
def finish = Instant.now()
Duration duration = Duration.between(start, finish)
if (duration.getSeconds() > max_duration_in_seconds) {
warn “$message is slow, it took $duration which is longer than the threshold of $max_duration_in_seconds”
}
result
}
This permits simple performance checks to be added to code with minimal disruption.
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