HystrixYammerMetricsPublisher

　　繼承HystrixMetricsPublisher，創建HystrixYammerMetricsPublisherCommand、HystrixYammerMetricsPublisherThreadPool、HystrixYammerMetricsPublisherCollapser。

 @Override
    public HystrixMetricsPublisherCommand getMetricsPublisherForCommand(HystrixCommandKey commandKey, HystrixCommandGroupKey commandGroupKey, HystrixCommandMetrics metrics, HystrixCircuitBreaker circuitBreaker, HystrixCommandProperties properties) {
        
 
return new HystrixYammerMetricsPublisherCommand(commandKey, commandGroupKey, metrics, circuitBreaker, properties, metricsRegistry);
    }

    @Override
    public HystrixMetricsPublisherThreadPool getMetricsPublisherForThreadPool(HystrixThreadPoolKey threadPoolKey, HystrixThreadPoolMetrics metrics, HystrixThreadPoolProperties properties) {
        
 
return new HystrixYammerMetricsPublisherThreadPool(threadPoolKey, metrics, properties, metricsRegistry);
    }

    @Override
    public HystrixMetricsPublisherCollapser getMetricsPublisherForCollapser(HystrixCollapserKey collapserKey, HystrixCollapserMetrics metrics, HystrixCollapserProperties properties) {
        
 
return new HystrixYammerMetricsPublisherCollapser(collapserKey, metrics, properties, metricsRegistry);
    }

HystrixYammerMetricsPublisherCommand

　　從HystrixCommandMetrics獲取數據，然後設置到MetricsRegistry中。

例如：

protected void createExecutionLatencyPercentileGauge(final String name, final double percentile) {
        metricsRegistry.newGauge(createMetricName(name), new Gauge<Integer>() {
            @Override
            public Integer value() {
                return metrics.getExecutionTimePercentile(percentile);
            }
        });
    }

HystrixYammerMetricsPublisherThreadPool

　　從HystrixThreadPoolMetrics獲取數據，然後設置到MetricsRegistry中。

例如：

metricsRegistry.newGauge(createMetricName("rollingMaxActiveThreads"), new Gauge<Number>() {
            @Override
            public Number value() {
                return metrics.getRollingMaxActiveThreads();
            }
        });

HystrixYammerMetricsPublisherCollapser

　　從HystrixCollapserMetrics獲取數據，然後設置到MetricsRegistry中。

例如：

metricsRegistry.newGauge(createMetricName("shardSize_percentile_50"), new Gauge<Integer>() {
            @Override
            public Integer value() {
                return metrics.getShardSizePercentile(50);
            }
        });

hystrix源碼小貼士之Yammer Publisher