Examples of com.netflix.hystrix.util.HystrixRollingNumber

com.netflix.hystrix.util.HystrixRollingNumber

A number which can be used to track counters (increment) or set values over time.

It is "rolling" in the sense that a 'timeInMilliseconds' is given that you want to track (such as 10 seconds) and then that is broken into buckets (defaults to 10) so that the 10 second window doesn't empty out and restart every 10 seconds, but instead every 1 second you have a new bucket added and one dropped so that 9 of the buckets remain and only the newest starts from scratch.

This is done so that the statistics are gathered over a rolling 10 second window with data being added/dropped in 1 second intervals (or whatever granularity is defined by the arguments) rather than each 10 second window starting at 0 again.

Performance-wise this class is optimized for writes, not reads. This is done because it expects far higher write volume (thousands/second) than reads (a few per second).

For example, on each read to getSum/getCount it will iterate buckets to sum the data so that on writes we don't need to maintain the overall sum and pay the synchronization cost at each write to ensure the sum is up-to-date when the read can easily iterate each bucket to get the sum when it needs it.

See UnitTest for usage and expected behavior examples. @ThreadSafe


    /* package */HystrixCommandMetrics(HystrixCommandKey key, HystrixCommandGroupKey commandGroup, HystrixCommandProperties properties, HystrixEventNotifier eventNotifier) {
        this.key = key;
        this.group = commandGroup;
        this.properties = properties;
        this.counter = new HystrixRollingNumber(properties.metricsRollingStatisticalWindowInMilliseconds(), properties.metricsRollingStatisticalWindowBuckets());
        this.percentileExecution = new HystrixRollingPercentile(properties.metricsRollingPercentileWindowInMilliseconds(), properties.metricsRollingPercentileWindowBuckets(), properties.metricsRollingPercentileBucketSize(), properties.metricsRollingPercentileEnabled());
        this.percentileTotal = new HystrixRollingPercentile(properties.metricsRollingPercentileWindowInMilliseconds(), properties.metricsRollingPercentileWindowBuckets(), properties.metricsRollingPercentileBucketSize(), properties.metricsRollingPercentileEnabled());
        this.eventNotifier = eventNotifier;
    }


    private HystrixThreadPoolMetrics(HystrixThreadPoolKey threadPoolKey, ThreadPoolExecutor threadPool, HystrixThreadPoolProperties properties) {
        this.threadPoolKey = threadPoolKey;
        this.threadPool = threadPool;
        this.properties = properties;
        this.counter = new HystrixRollingNumber(properties.metricsRollingStatisticalWindowInMilliseconds(), properties.metricsRollingStatisticalWindowBuckets());
    }

Examples of com.netflix.hystrix.util.HystrixRollingNumber

Related Classes of com.netflix.hystrix.util.HystrixRollingNumber